зеркало из https://github.com/github/ruby.git
1369 строки
45 KiB
Ruby
1369 строки
45 KiB
Ruby
# frozen_string_literal: true
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#
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# = open3.rb: Popen, but with stderr, too
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#
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# Author:: Yukihiro Matsumoto
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# Documentation:: Konrad Meyer
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#
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# Open3 gives you access to stdin, stdout, and stderr when running other
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# programs.
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#
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#
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# Open3 grants you access to stdin, stdout, stderr and a thread to wait for the
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# child process when running another program.
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# You can specify various attributes, redirections, current directory, etc., of
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# the program in the same way as for Process.spawn.
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#
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# - Open3.popen3 : pipes for stdin, stdout, stderr
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# - Open3.popen2 : pipes for stdin, stdout
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# - Open3.popen2e : pipes for stdin, merged stdout and stderr
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# - Open3.capture3 : give a string for stdin; get strings for stdout, stderr
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# - Open3.capture2 : give a string for stdin; get a string for stdout
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# - Open3.capture2e : give a string for stdin; get a string for merged stdout and stderr
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# - Open3.pipeline_rw : pipes for first stdin and last stdout of a pipeline
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# - Open3.pipeline_r : pipe for last stdout of a pipeline
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# - Open3.pipeline_w : pipe for first stdin of a pipeline
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# - Open3.pipeline_start : run a pipeline without waiting
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# - Open3.pipeline : run a pipeline and wait for its completion
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#
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require 'open3/version'
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# \Module \Open3 supports creating child processes
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# with access to their $stdin, $stdout, and $stderr streams.
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#
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# == What's Here
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#
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# Each of these methods executes a given command in a new process or subshell,
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# or multiple commands in new processes and/or subshells:
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#
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# - Each of these methods executes a single command in a process or subshell,
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# accepts a string for input to $stdin,
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# and returns string output from $stdout, $stderr, or both:
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#
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# - Open3.capture2: Executes the command;
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# returns the string from $stdout.
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# - Open3.capture2e: Executes the command;
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# returns the string from merged $stdout and $stderr.
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# - Open3.capture3: Executes the command;
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# returns strings from $stdout and $stderr.
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#
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# - Each of these methods executes a single command in a process or subshell,
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# and returns pipes for $stdin, $stdout, and/or $stderr:
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#
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# - Open3.popen2: Executes the command;
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# returns pipes for $stdin and $stdout.
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# - Open3.popen2e: Executes the command;
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# returns pipes for $stdin and merged $stdout and $stderr.
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# - Open3.popen3: Executes the command;
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# returns pipes for $stdin, $stdout, and $stderr.
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#
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# - Each of these methods executes one or more commands in processes and/or subshells,
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# returns pipes for the first $stdin, the last $stdout, or both:
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#
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# - Open3.pipeline_r: Returns a pipe for the last $stdout.
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# - Open3.pipeline_rw: Returns pipes for the first $stdin and the last $stdout.
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# - Open3.pipeline_w: Returns a pipe for the first $stdin.
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# - Open3.pipeline_start: Does not wait for processes to complete.
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# - Open3.pipeline: Waits for processes to complete.
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#
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# Each of the methods above accepts:
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#
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# - An optional hash of environment variable names and values;
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# see {Execution Environment}[rdoc-ref:Process#Execution+Environment].
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# - A required string argument that is a +command_line+ or +exe_path+;
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# see {Argument command_line or exe_path}[rdoc-ref:Process#Argument+command_line+or+exe_path].
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# - An optional hash of execution options;
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# see {Execution Options}[rdoc-ref:Process#Execution+Options].
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#
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module Open3
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# :call-seq:
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# Open3.popen3([env, ] command_line, options = {}) -> [stdin, stdout, stderr, wait_thread]
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# Open3.popen3([env, ] exe_path, *args, options = {}) -> [stdin, stdout, stderr, wait_thread]
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# Open3.popen3([env, ] command_line, options = {}) {|stdin, stdout, stderr, wait_thread| ... } -> object
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# Open3.popen3([env, ] exe_path, *args, options = {}) {|stdin, stdout, stderr, wait_thread| ... } -> object
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#
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# Basically a wrapper for
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# {Process.spawn}[rdoc-ref:Process.spawn]
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# that:
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#
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# - Creates a child process, by calling Process.spawn with the given arguments.
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# - Creates streams +stdin+, +stdout+, and +stderr+,
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# which are the standard input, standard output, and standard error streams
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# in the child process.
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# - Creates thread +wait_thread+ that waits for the child process to exit;
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# the thread has method +pid+, which returns the process ID
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# of the child process.
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#
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# With no block given, returns the array
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# <tt>[stdin, stdout, stderr, wait_thread]</tt>.
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# The caller should close each of the three returned streams.
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#
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# stdin, stdout, stderr, wait_thread = Open3.popen3('echo')
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# # => [#<IO:fd 8>, #<IO:fd 10>, #<IO:fd 12>, #<Process::Waiter:0x00007f58d5428f58 run>]
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# stdin.close
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# stdout.close
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# stderr.close
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# wait_thread.pid # => 2210481
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# wait_thread.value # => #<Process::Status: pid 2210481 exit 0>
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#
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# With a block given, calls the block with the four variables
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# (three streams and the wait thread)
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# and returns the block's return value.
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# The caller need not close the streams:
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#
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# Open3.popen3('echo') do |stdin, stdout, stderr, wait_thread|
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# p stdin
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# p stdout
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# p stderr
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# p wait_thread
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# p wait_thread.pid
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# p wait_thread.value
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# end
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#
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# Output:
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#
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# #<IO:fd 6>
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# #<IO:fd 7>
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# #<IO:fd 9>
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# #<Process::Waiter:0x00007f58d53606e8 sleep>
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# 2211047
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# #<Process::Status: pid 2211047 exit 0>
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#
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# Like Process.spawn, this method has potential security vulnerabilities
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# if called with untrusted input;
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# see {Command Injection}[rdoc-ref:command_injection.rdoc].
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#
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# Unlike Process.spawn, this method waits for the child process to exit
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# before returning, so the caller need not do so.
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#
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# Argument +options+ is a hash of options for the new process;
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# see {Execution Options}[rdoc-ref:Process@Execution+Options].
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#
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# The single required argument is one of the following:
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#
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# - +command_line+ if it is a string,
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# and if it begins with a shell reserved word or special built-in,
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# or if it contains one or more metacharacters.
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# - +exe_path+ otherwise.
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#
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# <b>Argument +command_line+</b>
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#
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# \String argument +command_line+ is a command line to be passed to a shell;
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# it must begin with a shell reserved word, begin with a special built-in,
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# or contain meta characters:
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#
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# Open3.popen3('if true; then echo "Foo"; fi') {|*args| p args } # Shell reserved word.
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# Open3.popen3('echo') {|*args| p args } # Built-in.
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# Open3.popen3('date > date.tmp') {|*args| p args } # Contains meta character.
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#
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# Output (similar for each call above):
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#
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# [#<IO:(closed)>, #<IO:(closed)>, #<IO:(closed)>, #<Process::Waiter:0x00007f58d52f28c8 dead>]
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#
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# The command line may also contain arguments and options for the command:
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#
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# Open3.popen3('echo "Foo"') { |i, o, e, t| o.gets }
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# "Foo\n"
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#
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# <b>Argument +exe_path+</b>
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#
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# Argument +exe_path+ is one of the following:
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#
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# - The string path to an executable to be called.
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# - A 2-element array containing the path to an executable
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# and the string to be used as the name of the executing process.
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#
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# Example:
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#
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# Open3.popen3('/usr/bin/date') { |i, o, e, t| o.gets }
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# # => "Wed Sep 27 02:56:44 PM CDT 2023\n"
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#
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# Ruby invokes the executable directly, with no shell and no shell expansion:
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#
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# Open3.popen3('doesnt_exist') { |i, o, e, t| o.gets } # Raises Errno::ENOENT
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#
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# If one or more +args+ is given, each is an argument or option
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# to be passed to the executable:
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#
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# Open3.popen3('echo', 'C #') { |i, o, e, t| o.gets }
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# # => "C #\n"
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# Open3.popen3('echo', 'hello', 'world') { |i, o, e, t| o.gets }
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# # => "hello world\n"
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#
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# Take care to avoid deadlocks.
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# Output streams +stdout+ and +stderr+ have fixed-size buffers,
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# so reading extensively from one but not the other can cause a deadlock
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# when the unread buffer fills.
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# To avoid that, +stdout+ and +stderr+ should be read simultaneously
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# (using threads or IO.select).
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#
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# Related:
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#
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# - Open3.popen2: Makes the standard input and standard output streams
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# of the child process available as separate streams,
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# with no access to the standard error stream.
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# - Open3.popen2e: Makes the standard input and the merge
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# of the standard output and standard error streams
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# of the child process available as separate streams.
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#
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def popen3(*cmd, &block)
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if Hash === cmd.last
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opts = cmd.pop.dup
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else
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opts = {}
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end
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in_r, in_w = IO.pipe
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opts[:in] = in_r
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in_w.sync = true
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out_r, out_w = IO.pipe
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opts[:out] = out_w
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err_r, err_w = IO.pipe
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opts[:err] = err_w
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popen_run(cmd, opts, [in_r, out_w, err_w], [in_w, out_r, err_r], &block)
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end
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module_function :popen3
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# :call-seq:
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# Open3.popen2([env, ] command_line, options = {}) -> [stdin, stdout, wait_thread]
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# Open3.popen2([env, ] exe_path, *args, options = {}) -> [stdin, stdout, wait_thread]
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# Open3.popen2([env, ] command_line, options = {}) {|stdin, stdout, wait_thread| ... } -> object
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# Open3.popen2([env, ] exe_path, *args, options = {}) {|stdin, stdout, wait_thread| ... } -> object
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#
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# Basically a wrapper for
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# {Process.spawn}[rdoc-ref:Process.spawn]
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# that:
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#
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# - Creates a child process, by calling Process.spawn with the given arguments.
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# - Creates streams +stdin+ and +stdout+,
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# which are the standard input and standard output streams
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# in the child process.
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# - Creates thread +wait_thread+ that waits for the child process to exit;
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# the thread has method +pid+, which returns the process ID
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# of the child process.
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#
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# With no block given, returns the array
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# <tt>[stdin, stdout, wait_thread]</tt>.
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# The caller should close each of the two returned streams.
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#
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# stdin, stdout, wait_thread = Open3.popen2('echo')
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# # => [#<IO:fd 6>, #<IO:fd 7>, #<Process::Waiter:0x00007f58d52dbe98 run>]
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# stdin.close
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# stdout.close
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# wait_thread.pid # => 2263572
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# wait_thread.value # => #<Process::Status: pid 2263572 exit 0>
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#
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# With a block given, calls the block with the three variables
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# (two streams and the wait thread)
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# and returns the block's return value.
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# The caller need not close the streams:
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#
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# Open3.popen2('echo') do |stdin, stdout, wait_thread|
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# p stdin
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# p stdout
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# p wait_thread
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# p wait_thread.pid
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# p wait_thread.value
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# end
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#
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# Output:
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#
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# #<IO:fd 6>
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# #<IO:fd 7>
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# #<Process::Waiter:0x00007f58d59a34b0 sleep>
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# 2263636
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# #<Process::Status: pid 2263636 exit 0>
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#
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# Like Process.spawn, this method has potential security vulnerabilities
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# if called with untrusted input;
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# see {Command Injection}[rdoc-ref:command_injection.rdoc].
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#
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# Unlike Process.spawn, this method waits for the child process to exit
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# before returning, so the caller need not do so.
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#
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# Argument +options+ is a hash of options for the new process;
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# see {Execution Options}[rdoc-ref:Process@Execution+Options].
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#
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# The single required argument is one of the following:
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#
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# - +command_line+ if it is a string,
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# and if it begins with a shell reserved word or special built-in,
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# or if it contains one or more metacharacters.
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# - +exe_path+ otherwise.
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#
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# <b>Argument +command_line+</b>
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#
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# \String argument +command_line+ is a command line to be passed to a shell;
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# it must begin with a shell reserved word, begin with a special built-in,
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# or contain meta characters:
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#
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# Open3.popen2('if true; then echo "Foo"; fi') {|*args| p args } # Shell reserved word.
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# Open3.popen2('echo') {|*args| p args } # Built-in.
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# Open3.popen2('date > date.tmp') {|*args| p args } # Contains meta character.
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#
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# Output (similar for each call above):
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#
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# # => [#<IO:(closed)>, #<IO:(closed)>, #<Process::Waiter:0x00007f7577dfe410 dead>]
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#
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# The command line may also contain arguments and options for the command:
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#
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# Open3.popen2('echo "Foo"') { |i, o, t| o.gets }
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# "Foo\n"
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#
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# <b>Argument +exe_path+</b>
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#
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# Argument +exe_path+ is one of the following:
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#
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# - The string path to an executable to be called.
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# - A 2-element array containing the path to an executable
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# and the string to be used as the name of the executing process.
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#
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# Example:
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#
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# Open3.popen2('/usr/bin/date') { |i, o, t| o.gets }
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# # => "Thu Sep 28 09:41:06 AM CDT 2023\n"
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#
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# Ruby invokes the executable directly, with no shell and no shell expansion:
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#
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# Open3.popen2('doesnt_exist') { |i, o, t| o.gets } # Raises Errno::ENOENT
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#
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# If one or more +args+ is given, each is an argument or option
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# to be passed to the executable:
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#
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# Open3.popen2('echo', 'C #') { |i, o, t| o.gets }
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# # => "C #\n"
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# Open3.popen2('echo', 'hello', 'world') { |i, o, t| o.gets }
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# # => "hello world\n"
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#
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#
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# Related:
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#
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# - Open3.popen2e: Makes the standard input and the merge
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# of the standard output and standard error streams
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# of the child process available as separate streams.
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# - Open3.popen3: Makes the standard input, standard output,
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# and standard error streams
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# of the child process available as separate streams.
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#
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def popen2(*cmd, &block)
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if Hash === cmd.last
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opts = cmd.pop.dup
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else
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opts = {}
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end
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in_r, in_w = IO.pipe
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opts[:in] = in_r
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in_w.sync = true
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out_r, out_w = IO.pipe
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opts[:out] = out_w
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popen_run(cmd, opts, [in_r, out_w], [in_w, out_r], &block)
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end
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module_function :popen2
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# :call-seq:
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# Open3.popen2e([env, ] command_line, options = {}) -> [stdin, stdout_and_stderr, wait_thread]
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# Open3.popen2e([env, ] exe_path, *args, options = {}) -> [stdin, stdout_and_stderr, wait_thread]
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# Open3.popen2e([env, ] command_line, options = {}) {|stdin, stdout_and_stderr, wait_thread| ... } -> object
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# Open3.popen2e([env, ] exe_path, *args, options = {}) {|stdin, stdout_and_stderr, wait_thread| ... } -> object
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#
|
|
# Basically a wrapper for
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|
# {Process.spawn}[rdoc-ref:Process.spawn]
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|
# that:
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#
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|
# - Creates a child process, by calling Process.spawn with the given arguments.
|
|
# - Creates streams +stdin+, +stdout_and_stderr+,
|
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# which are the standard input and the merge of the standard output
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# and standard error streams in the child process.
|
|
# - Creates thread +wait_thread+ that waits for the child process to exit;
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# the thread has method +pid+, which returns the process ID
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# of the child process.
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#
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# With no block given, returns the array
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# <tt>[stdin, stdout_and_stderr, wait_thread]</tt>.
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# The caller should close each of the two returned streams.
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#
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# stdin, stdout_and_stderr, wait_thread = Open3.popen2e('echo')
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# # => [#<IO:fd 6>, #<IO:fd 7>, #<Process::Waiter:0x00007f7577da4398 run>]
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# stdin.close
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# stdout_and_stderr.close
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# wait_thread.pid # => 2274600
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# wait_thread.value # => #<Process::Status: pid 2274600 exit 0>
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#
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# With a block given, calls the block with the three variables
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# (two streams and the wait thread)
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# and returns the block's return value.
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# The caller need not close the streams:
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#
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# Open3.popen2e('echo') do |stdin, stdout_and_stderr, wait_thread|
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# p stdin
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# p stdout_and_stderr
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# p wait_thread
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# p wait_thread.pid
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# p wait_thread.value
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# end
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#
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# Output:
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#
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# #<IO:fd 6>
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# #<IO:fd 7>
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# #<Process::Waiter:0x00007f75777578c8 sleep>
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# 2274763
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# #<Process::Status: pid 2274763 exit 0>
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#
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# Like Process.spawn, this method has potential security vulnerabilities
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# if called with untrusted input;
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# see {Command Injection}[rdoc-ref:command_injection.rdoc].
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#
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# Unlike Process.spawn, this method waits for the child process to exit
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# before returning, so the caller need not do so.
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#
|
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# Argument +options+ is a hash of options for the new process;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# The single required argument is one of the following:
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|
#
|
|
# - +command_line+ if it is a string,
|
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# and if it begins with a shell reserved word or special built-in,
|
|
# or if it contains one or more metacharacters.
|
|
# - +exe_path+ otherwise.
|
|
#
|
|
# <b>Argument +command_line+</b>
|
|
#
|
|
# \String argument +command_line+ is a command line to be passed to a shell;
|
|
# it must begin with a shell reserved word, begin with a special built-in,
|
|
# or contain meta characters:
|
|
#
|
|
# Open3.popen2e('if true; then echo "Foo"; fi') {|*args| p args } # Shell reserved word.
|
|
# Open3.popen2e('echo') {|*args| p args } # Built-in.
|
|
# Open3.popen2e('date > date.tmp') {|*args| p args } # Contains meta character.
|
|
#
|
|
# Output (similar for each call above):
|
|
#
|
|
# # => [#<IO:(closed)>, #<IO:(closed)>, #<Process::Waiter:0x00007f7577d8a1f0 dead>]
|
|
#
|
|
# The command line may also contain arguments and options for the command:
|
|
#
|
|
# Open3.popen2e('echo "Foo"') { |i, o_and_e, t| o_and_e.gets }
|
|
# "Foo\n"
|
|
#
|
|
# <b>Argument +exe_path+</b>
|
|
#
|
|
# Argument +exe_path+ is one of the following:
|
|
#
|
|
# - The string path to an executable to be called.
|
|
# - A 2-element array containing the path to an executable
|
|
# and the string to be used as the name of the executing process.
|
|
#
|
|
# Example:
|
|
#
|
|
# Open3.popen2e('/usr/bin/date') { |i, o_and_e, t| o_and_e.gets }
|
|
# # => "Thu Sep 28 01:58:45 PM CDT 2023\n"
|
|
#
|
|
# Ruby invokes the executable directly, with no shell and no shell expansion:
|
|
#
|
|
# Open3.popen2e('doesnt_exist') { |i, o_and_e, t| o_and_e.gets } # Raises Errno::ENOENT
|
|
#
|
|
# If one or more +args+ is given, each is an argument or option
|
|
# to be passed to the executable:
|
|
#
|
|
# Open3.popen2e('echo', 'C #') { |i, o_and_e, t| o_and_e.gets }
|
|
# # => "C #\n"
|
|
# Open3.popen2e('echo', 'hello', 'world') { |i, o_and_e, t| o_and_e.gets }
|
|
# # => "hello world\n"
|
|
#
|
|
# Related:
|
|
#
|
|
# - Open3.popen2: Makes the standard input and standard output streams
|
|
# of the child process available as separate streams,
|
|
# with no access to the standard error stream.
|
|
# - Open3.popen3: Makes the standard input, standard output,
|
|
# and standard error streams
|
|
# of the child process available as separate streams.
|
|
#
|
|
def popen2e(*cmd, &block)
|
|
if Hash === cmd.last
|
|
opts = cmd.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
in_r, in_w = IO.pipe
|
|
opts[:in] = in_r
|
|
in_w.sync = true
|
|
|
|
out_r, out_w = IO.pipe
|
|
opts[[:out, :err]] = out_w
|
|
|
|
popen_run(cmd, opts, [in_r, out_w], [in_w, out_r], &block)
|
|
ensure
|
|
if block
|
|
in_r.close
|
|
in_w.close
|
|
out_r.close
|
|
out_w.close
|
|
end
|
|
end
|
|
module_function :popen2e
|
|
|
|
def popen_run(cmd, opts, child_io, parent_io) # :nodoc:
|
|
pid = spawn(*cmd, opts)
|
|
wait_thr = Process.detach(pid)
|
|
child_io.each(&:close)
|
|
result = [*parent_io, wait_thr]
|
|
if defined? yield
|
|
begin
|
|
return yield(*result)
|
|
ensure
|
|
parent_io.each(&:close)
|
|
wait_thr.join
|
|
end
|
|
end
|
|
result
|
|
end
|
|
module_function :popen_run
|
|
class << self
|
|
private :popen_run
|
|
end
|
|
|
|
# :call-seq:
|
|
# Open3.capture3([env, ] command_line, options = {}) -> [stdout_s, stderr_s, status]
|
|
# Open3.capture3([env, ] exe_path, *args, options = {}) -> [stdout_s, stderr_s, status]
|
|
#
|
|
# Basically a wrapper for Open3.popen3 that:
|
|
#
|
|
# - Creates a child process, by calling Open3.popen3 with the given arguments
|
|
# (except for certain entries in hash +options+; see below).
|
|
# - Returns as strings +stdout_s+ and +stderr_s+ the standard output
|
|
# and standard error of the child process.
|
|
# - Returns as +status+ a <tt>Process::Status</tt> object
|
|
# that represents the exit status of the child process.
|
|
#
|
|
# Returns the array <tt>[stdout_s, stderr_s, status]</tt>:
|
|
#
|
|
# stdout_s, stderr_s, status = Open3.capture3('echo "Foo"')
|
|
# # => ["Foo\n", "", #<Process::Status: pid 2281954 exit 0>]
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# Unlike Process.spawn, this method waits for the child process to exit
|
|
# before returning, so the caller need not do so.
|
|
#
|
|
# Argument +options+ is a hash of options for the new process;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# The hash +options+ is passed to method Open3.popen3;
|
|
# two options have local effect in method Open3.capture3:
|
|
#
|
|
# - If entry <tt>options[:stdin_data]</tt> exists, the entry is removed
|
|
# and its string value is sent to the command's standard input:
|
|
#
|
|
# Open3.capture3('tee', stdin_data: 'Foo')
|
|
# # => ["Foo", "", #<Process::Status: pid 2319575 exit 0>]
|
|
#
|
|
# - If entry <tt>options[:binmode]</tt> exists, the entry is removed
|
|
# the internal streams are set to binary mode.
|
|
#
|
|
# The single required argument is one of the following:
|
|
#
|
|
# - +command_line+ if it is a string,
|
|
# and if it begins with a shell reserved word or special built-in,
|
|
# or if it contains one or more metacharacters.
|
|
# - +exe_path+ otherwise.
|
|
#
|
|
# <b>Argument +command_line+</b>
|
|
#
|
|
# \String argument +command_line+ is a command line to be passed to a shell;
|
|
# it must begin with a shell reserved word, begin with a special built-in,
|
|
# or contain meta characters:
|
|
#
|
|
# Open3.capture3('if true; then echo "Foo"; fi') # Shell reserved word.
|
|
# # => ["Foo\n", "", #<Process::Status: pid 2282025 exit 0>]
|
|
# Open3.capture3('echo') # Built-in.
|
|
# # => ["\n", "", #<Process::Status: pid 2282092 exit 0>]
|
|
# Open3.capture3('date > date.tmp') # Contains meta character.
|
|
# # => ["", "", #<Process::Status: pid 2282110 exit 0>]
|
|
#
|
|
# The command line may also contain arguments and options for the command:
|
|
#
|
|
# Open3.capture3('echo "Foo"')
|
|
# # => ["Foo\n", "", #<Process::Status: pid 2282092 exit 0>]
|
|
#
|
|
# <b>Argument +exe_path+</b>
|
|
#
|
|
# Argument +exe_path+ is one of the following:
|
|
#
|
|
# - The string path to an executable to be called.
|
|
# - A 2-element array containing the path to an executable
|
|
# and the string to be used as the name of the executing process.
|
|
#
|
|
# Example:
|
|
#
|
|
# Open3.capture3('/usr/bin/date')
|
|
# # => ["Thu Sep 28 05:03:51 PM CDT 2023\n", "", #<Process::Status: pid 2282300 exit 0>]
|
|
#
|
|
# Ruby invokes the executable directly, with no shell and no shell expansion:
|
|
#
|
|
# Open3.capture3('doesnt_exist') # Raises Errno::ENOENT
|
|
#
|
|
# If one or more +args+ is given, each is an argument or option
|
|
# to be passed to the executable:
|
|
#
|
|
# Open3.capture3('echo', 'C #')
|
|
# # => ["C #\n", "", #<Process::Status: pid 2282368 exit 0>]
|
|
# Open3.capture3('echo', 'hello', 'world')
|
|
# # => ["hello world\n", "", #<Process::Status: pid 2282372 exit 0>]
|
|
#
|
|
def capture3(*cmd)
|
|
if Hash === cmd.last
|
|
opts = cmd.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
stdin_data = opts.delete(:stdin_data) || ''
|
|
binmode = opts.delete(:binmode)
|
|
|
|
popen3(*cmd, opts) {|i, o, e, t|
|
|
if binmode
|
|
i.binmode
|
|
o.binmode
|
|
e.binmode
|
|
end
|
|
out_reader = Thread.new { o.read }
|
|
err_reader = Thread.new { e.read }
|
|
begin
|
|
if stdin_data.respond_to? :readpartial
|
|
IO.copy_stream(stdin_data, i)
|
|
else
|
|
i.write stdin_data
|
|
end
|
|
rescue Errno::EPIPE
|
|
end
|
|
i.close
|
|
[out_reader.value, err_reader.value, t.value]
|
|
}
|
|
end
|
|
module_function :capture3
|
|
|
|
# :call-seq:
|
|
# Open3.capture2([env, ] command_line, options = {}) -> [stdout_s, status]
|
|
# Open3.capture2([env, ] exe_path, *args, options = {}) -> [stdout_s, status]
|
|
#
|
|
# Basically a wrapper for Open3.popen3 that:
|
|
#
|
|
# - Creates a child process, by calling Open3.popen3 with the given arguments
|
|
# (except for certain entries in hash +options+; see below).
|
|
# - Returns as string +stdout_s+ the standard output of the child process.
|
|
# - Returns as +status+ a <tt>Process::Status</tt> object
|
|
# that represents the exit status of the child process.
|
|
#
|
|
# Returns the array <tt>[stdout_s, status]</tt>:
|
|
#
|
|
# stdout_s, status = Open3.capture2('echo "Foo"')
|
|
# # => ["Foo\n", #<Process::Status: pid 2326047 exit 0>]
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# Unlike Process.spawn, this method waits for the child process to exit
|
|
# before returning, so the caller need not do so.
|
|
#
|
|
# Argument +options+ is a hash of options for the new process;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# The hash +options+ is passed to method Open3.popen3;
|
|
# two options have local effect in method Open3.capture2:
|
|
#
|
|
# - If entry <tt>options[:stdin_data]</tt> exists, the entry is removed
|
|
# and its string value is sent to the command's standard input:
|
|
#
|
|
# Open3.capture2('tee', stdin_data: 'Foo')
|
|
#
|
|
# # => ["Foo", #<Process::Status: pid 2326087 exit 0>]
|
|
#
|
|
# the internal streams are set to binary mode.
|
|
#
|
|
# The single required argument is one of the following:
|
|
#
|
|
# - +command_line+ if it is a string,
|
|
# and if it begins with a shell reserved word or special built-in,
|
|
# or if it contains one or more metacharacters.
|
|
# - +exe_path+ otherwise.
|
|
#
|
|
# <b>Argument +command_line+</b>
|
|
#
|
|
# \String argument +command_line+ is a command line to be passed to a shell;
|
|
# it must begin with a shell reserved word, begin with a special built-in,
|
|
# or contain meta characters:
|
|
#
|
|
# Open3.capture2('if true; then echo "Foo"; fi') # Shell reserved word.
|
|
# # => ["Foo\n", #<Process::Status: pid 2326131 exit 0>]
|
|
# Open3.capture2('echo') # Built-in.
|
|
# # => ["\n", #<Process::Status: pid 2326139 exit 0>]
|
|
# Open3.capture2('date > date.tmp') # Contains meta character.
|
|
# # => ["", #<Process::Status: pid 2326174 exit 0>]
|
|
#
|
|
# The command line may also contain arguments and options for the command:
|
|
#
|
|
# Open3.capture2('echo "Foo"')
|
|
# # => ["Foo\n", #<Process::Status: pid 2326183 exit 0>]
|
|
#
|
|
# <b>Argument +exe_path+</b>
|
|
#
|
|
# Argument +exe_path+ is one of the following:
|
|
#
|
|
# - The string path to an executable to be called.
|
|
# - A 2-element array containing the path to an executable
|
|
# and the string to be used as the name of the executing process.
|
|
#
|
|
# Example:
|
|
#
|
|
# Open3.capture2('/usr/bin/date')
|
|
# # => ["Fri Sep 29 01:00:39 PM CDT 2023\n", #<Process::Status: pid 2326222 exit 0>]
|
|
#
|
|
# Ruby invokes the executable directly, with no shell and no shell expansion:
|
|
#
|
|
# Open3.capture2('doesnt_exist') # Raises Errno::ENOENT
|
|
#
|
|
# If one or more +args+ is given, each is an argument or option
|
|
# to be passed to the executable:
|
|
#
|
|
# Open3.capture2('echo', 'C #')
|
|
# # => ["C #\n", #<Process::Status: pid 2326267 exit 0>]
|
|
# Open3.capture2('echo', 'hello', 'world')
|
|
# # => ["hello world\n", #<Process::Status: pid 2326299 exit 0>]
|
|
#
|
|
def capture2(*cmd)
|
|
if Hash === cmd.last
|
|
opts = cmd.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
stdin_data = opts.delete(:stdin_data)
|
|
binmode = opts.delete(:binmode)
|
|
|
|
popen2(*cmd, opts) {|i, o, t|
|
|
if binmode
|
|
i.binmode
|
|
o.binmode
|
|
end
|
|
out_reader = Thread.new { o.read }
|
|
if stdin_data
|
|
begin
|
|
if stdin_data.respond_to? :readpartial
|
|
IO.copy_stream(stdin_data, i)
|
|
else
|
|
i.write stdin_data
|
|
end
|
|
rescue Errno::EPIPE
|
|
end
|
|
end
|
|
i.close
|
|
[out_reader.value, t.value]
|
|
}
|
|
end
|
|
module_function :capture2
|
|
|
|
# :call-seq:
|
|
# Open3.capture2e([env, ] command_line, options = {}) -> [stdout_and_stderr_s, status]
|
|
# Open3.capture2e([env, ] exe_path, *args, options = {}) -> [stdout_and_stderr_s, status]
|
|
#
|
|
# Basically a wrapper for Open3.popen3 that:
|
|
#
|
|
# - Creates a child process, by calling Open3.popen3 with the given arguments
|
|
# (except for certain entries in hash +options+; see below).
|
|
# - Returns as string +stdout_and_stderr_s+ the merged standard output
|
|
# and standard error of the child process.
|
|
# - Returns as +status+ a <tt>Process::Status</tt> object
|
|
# that represents the exit status of the child process.
|
|
#
|
|
# Returns the array <tt>[stdout_and_stderr_s, status]</tt>:
|
|
#
|
|
# stdout_and_stderr_s, status = Open3.capture2e('echo "Foo"')
|
|
# # => ["Foo\n", #<Process::Status: pid 2371692 exit 0>]
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# Unlike Process.spawn, this method waits for the child process to exit
|
|
# before returning, so the caller need not do so.
|
|
#
|
|
# Argument +options+ is a hash of options for the new process;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# The hash +options+ is passed to method Open3.popen3;
|
|
# two options have local effect in method Open3.capture2e:
|
|
#
|
|
# - If entry <tt>options[:stdin_data]</tt> exists, the entry is removed
|
|
# and its string value is sent to the command's standard input:
|
|
#
|
|
# Open3.capture2e('tee', stdin_data: 'Foo')
|
|
# # => ["Foo", #<Process::Status: pid 2371732 exit 0>]
|
|
#
|
|
# the internal streams are set to binary mode.
|
|
#
|
|
# The single required argument is one of the following:
|
|
#
|
|
# - +command_line+ if it is a string,
|
|
# and if it begins with a shell reserved word or special built-in,
|
|
# or if it contains one or more metacharacters.
|
|
# - +exe_path+ otherwise.
|
|
#
|
|
# <b>Argument +command_line+</b>
|
|
#
|
|
# \String argument +command_line+ is a command line to be passed to a shell;
|
|
# it must begin with a shell reserved word, begin with a special built-in,
|
|
# or contain meta characters:
|
|
#
|
|
# Open3.capture2e('if true; then echo "Foo"; fi') # Shell reserved word.
|
|
# # => ["Foo\n", #<Process::Status: pid 2371740 exit 0>]
|
|
# Open3.capture2e('echo') # Built-in.
|
|
# # => ["\n", #<Process::Status: pid 2371774 exit 0>]
|
|
# Open3.capture2e('date > date.tmp') # Contains meta character.
|
|
# # => ["", #<Process::Status: pid 2371812 exit 0>]
|
|
#
|
|
# The command line may also contain arguments and options for the command:
|
|
#
|
|
# Open3.capture2e('echo "Foo"')
|
|
# # => ["Foo\n", #<Process::Status: pid 2326183 exit 0>]
|
|
#
|
|
# <b>Argument +exe_path+</b>
|
|
#
|
|
# Argument +exe_path+ is one of the following:
|
|
#
|
|
# - The string path to an executable to be called.
|
|
# - A 2-element array containing the path to an executable
|
|
# and the string to be used as the name of the executing process.
|
|
#
|
|
# Example:
|
|
#
|
|
# Open3.capture2e('/usr/bin/date')
|
|
# # => ["Sat Sep 30 09:01:46 AM CDT 2023\n", #<Process::Status: pid 2371820 exit 0>]
|
|
#
|
|
# Ruby invokes the executable directly, with no shell and no shell expansion:
|
|
#
|
|
# Open3.capture2e('doesnt_exist') # Raises Errno::ENOENT
|
|
#
|
|
# If one or more +args+ is given, each is an argument or option
|
|
# to be passed to the executable:
|
|
#
|
|
# Open3.capture2e('echo', 'C #')
|
|
# # => ["C #\n", #<Process::Status: pid 2371856 exit 0>]
|
|
# Open3.capture2e('echo', 'hello', 'world')
|
|
# # => ["hello world\n", #<Process::Status: pid 2371894 exit 0>]
|
|
#
|
|
def capture2e(*cmd)
|
|
if Hash === cmd.last
|
|
opts = cmd.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
stdin_data = opts.delete(:stdin_data)
|
|
binmode = opts.delete(:binmode)
|
|
|
|
popen2e(*cmd, opts) {|i, oe, t|
|
|
if binmode
|
|
i.binmode
|
|
oe.binmode
|
|
end
|
|
outerr_reader = Thread.new { oe.read }
|
|
if stdin_data
|
|
begin
|
|
if stdin_data.respond_to? :readpartial
|
|
IO.copy_stream(stdin_data, i)
|
|
else
|
|
i.write stdin_data
|
|
end
|
|
rescue Errno::EPIPE
|
|
end
|
|
end
|
|
i.close
|
|
[outerr_reader.value, t.value]
|
|
}
|
|
end
|
|
module_function :capture2e
|
|
|
|
# :call-seq:
|
|
# Open3.pipeline_rw([env, ] *cmds, options = {}) -> [first_stdin, last_stdout, wait_threads]
|
|
#
|
|
# Basically a wrapper for
|
|
# {Process.spawn}[rdoc-ref:Process.spawn]
|
|
# that:
|
|
#
|
|
# - Creates a child process for each of the given +cmds+
|
|
# by calling Process.spawn.
|
|
# - Pipes the +stdout+ from each child to the +stdin+ of the next child,
|
|
# or, for the first child, from the caller's +stdin+,
|
|
# or, for the last child, to the caller's +stdout+.
|
|
#
|
|
# The method does not wait for child processes to exit,
|
|
# so the caller must do so.
|
|
#
|
|
# With no block given, returns a 3-element array containing:
|
|
#
|
|
# - The +stdin+ stream of the first child process.
|
|
# - The +stdout+ stream of the last child process.
|
|
# - An array of the wait threads for all of the child processes.
|
|
#
|
|
# Example:
|
|
#
|
|
# first_stdin, last_stdout, wait_threads = Open3.pipeline_rw('sort', 'cat -n')
|
|
# # => [#<IO:fd 20>, #<IO:fd 21>, [#<Process::Waiter:0x000055e8de29ab40 sleep>, #<Process::Waiter:0x000055e8de29a690 sleep>]]
|
|
# first_stdin.puts("foo\nbar\nbaz")
|
|
# first_stdin.close # Send EOF to sort.
|
|
# puts last_stdout.read
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# 1 bar
|
|
# 2 baz
|
|
# 3 foo
|
|
#
|
|
# With a block given, calls the block with the +stdin+ stream of the first child,
|
|
# the +stdout+ stream of the last child,
|
|
# and an array of the wait processes:
|
|
#
|
|
# Open3.pipeline_rw('sort', 'cat -n') do |first_stdin, last_stdout, wait_threads|
|
|
# first_stdin.puts "foo\nbar\nbaz"
|
|
# first_stdin.close # send EOF to sort.
|
|
# puts last_stdout.read
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# 1 bar
|
|
# 2 baz
|
|
# 3 foo
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# If the first argument is a hash, it becomes leading argument +env+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Environment}[rdoc-ref:Process@Execution+Environment].
|
|
#
|
|
# If the last argument is a hash, it becomes trailing argument +options+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# Each remaining argument in +cmds+ is one of:
|
|
#
|
|
# - A +command_line+: a string that begins with a shell reserved word
|
|
# or special built-in, or contains one or more metacharacters.
|
|
# - An +exe_path+: the string path to an executable to be called.
|
|
# - An array containing a +command_line+ or an +exe_path+,
|
|
# along with zero or more string arguments for the command.
|
|
#
|
|
def pipeline_rw(*cmds, &block)
|
|
if Hash === cmds.last
|
|
opts = cmds.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
in_r, in_w = IO.pipe
|
|
opts[:in] = in_r
|
|
in_w.sync = true
|
|
|
|
out_r, out_w = IO.pipe
|
|
opts[:out] = out_w
|
|
|
|
pipeline_run(cmds, opts, [in_r, out_w], [in_w, out_r], &block)
|
|
end
|
|
module_function :pipeline_rw
|
|
|
|
# :call-seq:
|
|
# Open3.pipeline_r([env, ] *cmds, options = {}) -> [last_stdout, wait_threads]
|
|
#
|
|
# Basically a wrapper for
|
|
# {Process.spawn}[rdoc-ref:Process.spawn]
|
|
# that:
|
|
#
|
|
# - Creates a child process for each of the given +cmds+
|
|
# by calling Process.spawn.
|
|
# - Pipes the +stdout+ from each child to the +stdin+ of the next child,
|
|
# or, for the last child, to the caller's +stdout+.
|
|
#
|
|
# The method does not wait for child processes to exit,
|
|
# so the caller must do so.
|
|
#
|
|
# With no block given, returns a 2-element array containing:
|
|
#
|
|
# - The +stdout+ stream of the last child process.
|
|
# - An array of the wait threads for all of the child processes.
|
|
#
|
|
# Example:
|
|
#
|
|
# last_stdout, wait_threads = Open3.pipeline_r('ls', 'grep R')
|
|
# # => [#<IO:fd 5>, [#<Process::Waiter:0x000055e8de2f9898 dead>, #<Process::Waiter:0x000055e8de2f94b0 sleep>]]
|
|
# puts last_stdout.read
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# Rakefile
|
|
# README.md
|
|
#
|
|
# With a block given, calls the block with the +stdout+ stream
|
|
# of the last child process,
|
|
# and an array of the wait processes:
|
|
#
|
|
# Open3.pipeline_r('ls', 'grep R') do |last_stdout, wait_threads|
|
|
# puts last_stdout.read
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# Rakefile
|
|
# README.md
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# If the first argument is a hash, it becomes leading argument +env+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Environment}[rdoc-ref:Process@Execution+Environment].
|
|
#
|
|
# If the last argument is a hash, it becomes trailing argument +options+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# Each remaining argument in +cmds+ is one of:
|
|
#
|
|
# - A +command_line+: a string that begins with a shell reserved word
|
|
# or special built-in, or contains one or more metacharacters.
|
|
# - An +exe_path+: the string path to an executable to be called.
|
|
# - An array containing a +command_line+ or an +exe_path+,
|
|
# along with zero or more string arguments for the command.
|
|
#
|
|
def pipeline_r(*cmds, &block)
|
|
if Hash === cmds.last
|
|
opts = cmds.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
out_r, out_w = IO.pipe
|
|
opts[:out] = out_w
|
|
|
|
pipeline_run(cmds, opts, [out_w], [out_r], &block)
|
|
end
|
|
module_function :pipeline_r
|
|
|
|
|
|
# :call-seq:
|
|
# Open3.pipeline_w([env, ] *cmds, options = {}) -> [first_stdin, wait_threads]
|
|
#
|
|
# Basically a wrapper for
|
|
# {Process.spawn}[rdoc-ref:Process.spawn]
|
|
# that:
|
|
#
|
|
# - Creates a child process for each of the given +cmds+
|
|
# by calling Process.spawn.
|
|
# - Pipes the +stdout+ from each child to the +stdin+ of the next child,
|
|
# or, for the first child, pipes the caller's +stdout+ to the child's +stdin+.
|
|
#
|
|
# The method does not wait for child processes to exit,
|
|
# so the caller must do so.
|
|
#
|
|
# With no block given, returns a 2-element array containing:
|
|
#
|
|
# - The +stdin+ stream of the first child process.
|
|
# - An array of the wait threads for all of the child processes.
|
|
#
|
|
# Example:
|
|
#
|
|
# first_stdin, wait_threads = Open3.pipeline_w('sort', 'cat -n')
|
|
# # => [#<IO:fd 7>, [#<Process::Waiter:0x000055e8de928278 run>, #<Process::Waiter:0x000055e8de923e80 run>]]
|
|
# first_stdin.puts("foo\nbar\nbaz")
|
|
# first_stdin.close # Send EOF to sort.
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# 1 bar
|
|
# 2 baz
|
|
# 3 foo
|
|
#
|
|
# With a block given, calls the block with the +stdin+ stream
|
|
# of the first child process,
|
|
# and an array of the wait processes:
|
|
#
|
|
# Open3.pipeline_w('sort', 'cat -n') do |first_stdin, wait_threads|
|
|
# first_stdin.puts("foo\nbar\nbaz")
|
|
# first_stdin.close # Send EOF to sort.
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# 1 bar
|
|
# 2 baz
|
|
# 3 foo
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# If the first argument is a hash, it becomes leading argument +env+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Environment}[rdoc-ref:Process@Execution+Environment].
|
|
#
|
|
# If the last argument is a hash, it becomes trailing argument +options+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# Each remaining argument in +cmds+ is one of:
|
|
#
|
|
# - A +command_line+: a string that begins with a shell reserved word
|
|
# or special built-in, or contains one or more metacharacters.
|
|
# - An +exe_path+: the string path to an executable to be called.
|
|
# - An array containing a +command_line+ or an +exe_path+,
|
|
# along with zero or more string arguments for the command.
|
|
#
|
|
def pipeline_w(*cmds, &block)
|
|
if Hash === cmds.last
|
|
opts = cmds.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
in_r, in_w = IO.pipe
|
|
opts[:in] = in_r
|
|
in_w.sync = true
|
|
|
|
pipeline_run(cmds, opts, [in_r], [in_w], &block)
|
|
end
|
|
module_function :pipeline_w
|
|
|
|
# :call-seq:
|
|
# Open3.pipeline_start([env, ] *cmds, options = {}) -> [wait_threads]
|
|
#
|
|
# Basically a wrapper for
|
|
# {Process.spawn}[rdoc-ref:Process.spawn]
|
|
# that:
|
|
#
|
|
# - Creates a child process for each of the given +cmds+
|
|
# by calling Process.spawn.
|
|
# - Does not wait for child processes to exit.
|
|
#
|
|
# With no block given, returns an array of the wait threads
|
|
# for all of the child processes.
|
|
#
|
|
# Example:
|
|
#
|
|
# wait_threads = Open3.pipeline_start('ls', 'grep R')
|
|
# # => [#<Process::Waiter:0x000055e8de9d2bb0 run>, #<Process::Waiter:0x000055e8de9d2890 run>]
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# Rakefile
|
|
# README.md
|
|
#
|
|
# With a block given, calls the block with an array of the wait processes:
|
|
#
|
|
# Open3.pipeline_start('ls', 'grep R') do |wait_threads|
|
|
# wait_threads.each do |wait_thread|
|
|
# wait_thread.join
|
|
# end
|
|
# end
|
|
#
|
|
# Output:
|
|
#
|
|
# Rakefile
|
|
# README.md
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# If the first argument is a hash, it becomes leading argument +env+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Environment}[rdoc-ref:Process@Execution+Environment].
|
|
#
|
|
# If the last argument is a hash, it becomes trailing argument +options+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# Each remaining argument in +cmds+ is one of:
|
|
#
|
|
# - A +command_line+: a string that begins with a shell reserved word
|
|
# or special built-in, or contains one or more metacharacters.
|
|
# - An +exe_path+: the string path to an executable to be called.
|
|
# - An array containing a +command_line+ or an +exe_path+,
|
|
# along with zero or more string arguments for the command.
|
|
#
|
|
def pipeline_start(*cmds, &block)
|
|
if Hash === cmds.last
|
|
opts = cmds.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
if block
|
|
pipeline_run(cmds, opts, [], [], &block)
|
|
else
|
|
ts, = pipeline_run(cmds, opts, [], [])
|
|
ts
|
|
end
|
|
end
|
|
module_function :pipeline_start
|
|
|
|
# :call-seq:
|
|
# Open3.pipeline([env, ] *cmds, options = {}) -> array_of_statuses
|
|
#
|
|
# Basically a wrapper for
|
|
# {Process.spawn}[rdoc-ref:Process.spawn]
|
|
# that:
|
|
#
|
|
# - Creates a child process for each of the given +cmds+
|
|
# by calling Process.spawn.
|
|
# - Pipes the +stdout+ from each child to the +stdin+ of the next child,
|
|
# or, for the last child, to the caller's +stdout+.
|
|
# - Waits for the child processes to exit.
|
|
# - Returns an array of Process::Status objects (one for each child).
|
|
#
|
|
# Example:
|
|
#
|
|
# wait_threads = Open3.pipeline('ls', 'grep R')
|
|
# # => [#<Process::Status: pid 2139200 exit 0>, #<Process::Status: pid 2139202 exit 0>]
|
|
#
|
|
# Output:
|
|
#
|
|
# Rakefile
|
|
# README.md
|
|
#
|
|
# Like Process.spawn, this method has potential security vulnerabilities
|
|
# if called with untrusted input;
|
|
# see {Command Injection}[rdoc-ref:command_injection.rdoc].
|
|
#
|
|
# If the first argument is a hash, it becomes leading argument +env+
|
|
# in each call to Process.spawn;
|
|
# see {Execution Environment}[rdoc-ref:Process@Execution+Environment].
|
|
#
|
|
# If the last argument is a hash, it becomes trailing argument +options+
|
|
# in each call to Process.spawn'
|
|
# see {Execution Options}[rdoc-ref:Process@Execution+Options].
|
|
#
|
|
# Each remaining argument in +cmds+ is one of:
|
|
#
|
|
# - A +command_line+: a string that begins with a shell reserved word
|
|
# or special built-in, or contains one or more metacharacters.
|
|
# - An +exe_path+: the string path to an executable to be called.
|
|
# - An array containing a +command_line+ or an +exe_path+,
|
|
# along with zero or more string arguments for the command.
|
|
#
|
|
def pipeline(*cmds)
|
|
if Hash === cmds.last
|
|
opts = cmds.pop.dup
|
|
else
|
|
opts = {}
|
|
end
|
|
|
|
pipeline_run(cmds, opts, [], []) {|ts|
|
|
ts.map(&:value)
|
|
}
|
|
end
|
|
module_function :pipeline
|
|
|
|
def pipeline_run(cmds, pipeline_opts, child_io, parent_io) # :nodoc:
|
|
if cmds.empty?
|
|
raise ArgumentError, "no commands"
|
|
end
|
|
|
|
opts_base = pipeline_opts.dup
|
|
opts_base.delete :in
|
|
opts_base.delete :out
|
|
|
|
wait_thrs = []
|
|
r = nil
|
|
cmds.each_with_index {|cmd, i|
|
|
cmd_opts = opts_base.dup
|
|
if String === cmd
|
|
cmd = [cmd]
|
|
else
|
|
cmd_opts.update cmd.pop if Hash === cmd.last
|
|
end
|
|
if i == 0
|
|
if !cmd_opts.include?(:in)
|
|
if pipeline_opts.include?(:in)
|
|
cmd_opts[:in] = pipeline_opts[:in]
|
|
end
|
|
end
|
|
else
|
|
cmd_opts[:in] = r
|
|
end
|
|
if i != cmds.length - 1
|
|
r2, w2 = IO.pipe
|
|
cmd_opts[:out] = w2
|
|
else
|
|
if !cmd_opts.include?(:out)
|
|
if pipeline_opts.include?(:out)
|
|
cmd_opts[:out] = pipeline_opts[:out]
|
|
end
|
|
end
|
|
end
|
|
pid = spawn(*cmd, cmd_opts)
|
|
wait_thrs << Process.detach(pid)
|
|
r&.close
|
|
w2&.close
|
|
r = r2
|
|
}
|
|
result = parent_io + [wait_thrs]
|
|
child_io.each(&:close)
|
|
if defined? yield
|
|
begin
|
|
return yield(*result)
|
|
ensure
|
|
parent_io.each(&:close)
|
|
wait_thrs.each(&:join)
|
|
end
|
|
end
|
|
result
|
|
end
|
|
module_function :pipeline_run
|
|
class << self
|
|
private :pipeline_run
|
|
end
|
|
|
|
end
|
|
|
|
# JRuby uses different popen logic on Windows, require it here to reuse wrapper methods above.
|
|
require 'open3/jruby_windows' if RUBY_ENGINE == 'jruby' && JRuby::Util::ON_WINDOWS
|