2010-01-10 16:11:22 +03:00
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#!/bin/sh
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#
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# Copyright (c) 2009 Ilari Liusvaara
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#
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test_description='Test run command'
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. ./test-lib.sh
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2011-04-20 14:35:08 +04:00
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cat >hello-script <<-EOF
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#!$SHELL_PATH
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cat hello-script
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EOF
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>empty
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2010-01-10 16:11:22 +03:00
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test_expect_success 'start_command reports ENOENT' '
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test-run-command start-command-ENOENT ./does-not-exist
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'
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2011-04-20 14:35:08 +04:00
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test_expect_success 'run_command can run a command' '
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cat hello-script >hello.sh &&
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chmod +x hello.sh &&
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test-run-command run-command ./hello.sh >actual 2>err &&
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test_cmp hello-script actual &&
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test_cmp empty err
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'
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test_expect_success POSIXPERM 'run_command reports EACCES' '
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cat hello-script >hello.sh &&
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chmod -x hello.sh &&
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test_must_fail test-run-command run-command ./hello.sh 2>err &&
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grep "fatal: cannot exec.*hello.sh" err
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'
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tests: correct misuses of POSIXPERM
POSIXPERM requires that a later call to stat(2) (hence "ls -l")
faithfully reproduces what an earlier chmod(2) did. Some
filesystems cannot satisify this.
SANITY requires that a file or a directory is indeed accessible (or
inaccessible) when its permission bits would say it ought to be
accessible (or inaccessible). Running tests as root would lose this
prerequisite for obvious reasons.
Fix a few tests that misuse POSIXPERM.
t0061-run-command.sh has two uses of POSIXPERM.
- One checks that an attempt to execute a file that is marked as
unexecutable results in a failure with EACCES; I do not think
having root-ness or any other capability that busts the
filesystem permission mode bits will make you run an unexecutable
file, so this should be left as-is. The test does not have
anything to do with SANITY.
- The other one expects 'git nitfol' runs the alias when an
alias.nitfol is defined and a directory on the PATH is marked as
unreadable and unsearchable. I _think_ the test tries to reject
the alternative expectation that we want to refuse to run the
alias because it would break "no alias may mask a command" rule
if a file 'git-nitfol' exists in the unreadable directory but we
cannot even determine if that is the case. Under !SANITY that
busts the permission bits, this test no longer checks that, so it
must be protected with SANITY.
t1509-root-worktree.sh expects to be run on a / that is writable by
the user and sees if Git behaves "sensibly" when /.git is the
repository to govern a worktree that is the whole filesystem, and
also if Git behaves "sensibly" when / itself is a bare repository
with refs, objects, and friends (I find the definition of "behaves
sensibly" under these conditions hard to fathom, but it is a
different matter).
The implementation of the test is very much problematic.
- It requires POSIXPERM, but it does not do chmod or checks modes
in any way.
- It runs "rm /*" and "rm -fr /refs /objects ..." in one of the
tests, and also does "cd / && git init --bare". If done on a
live system that takes advantages of the "feature" being tested,
these obviously will clobber the system. But there is no guard
against such a breakage.
- It uses "test $UID = 0" to see rootness, which now should be
spelled "! test_have_prereq NOT_ROOT"
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-01-16 21:32:09 +03:00
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test_expect_success POSIXPERM,SANITY 'unreadable directory in PATH' '
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2012-03-30 11:52:18 +04:00
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mkdir local-command &&
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test_when_finished "chmod u+rwx local-command && rm -fr local-command" &&
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git config alias.nitfol "!echo frotz" &&
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chmod a-rx local-command &&
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(
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PATH=./local-command:$PATH &&
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git nitfol >actual
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) &&
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echo frotz >expect &&
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test_cmp expect actual
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'
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run-command: add an asynchronous parallel child processor
This allows to run external commands in parallel with ordered output
on stderr.
If we run external commands in parallel we cannot pipe the output directly
to the our stdout/err as it would mix up. So each process's output will
flow through a pipe, which we buffer. One subprocess can be directly
piped to out stdout/err for a low latency feedback to the user.
Example:
Let's assume we have 5 submodules A,B,C,D,E and each fetch takes a
different amount of time as the different submodules vary in size, then
the output of fetches in sequential order might look like this:
time -->
output: |---A---| |-B-| |-------C-------| |-D-| |-E-|
When we schedule these submodules into maximal two parallel processes,
a schedule and sample output over time may look like this:
process 1: |---A---| |-D-| |-E-|
process 2: |-B-| |-------C-------|
output: |---A---|B|---C-------|DE
So A will be perceived as it would run normally in the single child
version. As B has finished by the time A is done, we can dump its whole
progress buffer on stderr, such that it looks like it finished in no
time. Once that is done, C is determined to be the visible child and
its progress will be reported in real time.
So this way of output is really good for human consumption, as it only
changes the timing, not the actual output.
For machine consumption the output needs to be prepared in the tasks,
by either having a prefix per line or per block to indicate whose tasks
output is displayed, because the output order may not follow the
original sequential ordering:
|----A----| |--B--| |-C-|
will be scheduled to be all parallel:
process 1: |----A----|
process 2: |--B--|
process 3: |-C-|
output: |----A----|CB
This happens because C finished before B did, so it will be queued for
output before B.
To detect when a child has finished executing, we check interleaved
with other actions (such as checking the liveliness of children or
starting new processes) whether the stderr pipe still exists. Once a
child closed its stderr stream, we assume it is terminating very soon,
and use `finish_command()` from the single external process execution
interface to collect the exit status.
By maintaining the strong assumption of stderr being open until the
very end of a child process, we can avoid other hassle such as an
implementation using `waitpid(-1)`, which is not implemented in Windows.
Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2015-12-16 03:04:10 +03:00
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cat >expect <<-EOF
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preloaded output of a child
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Hello
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World
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preloaded output of a child
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Hello
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World
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preloaded output of a child
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Hello
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World
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preloaded output of a child
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Hello
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World
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EOF
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test_expect_success 'run_command runs in parallel with more jobs available than tasks' '
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test-run-command run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
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test_cmp expect actual
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'
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test_expect_success 'run_command runs in parallel with as many jobs as tasks' '
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test-run-command run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
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test_cmp expect actual
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'
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test_expect_success 'run_command runs in parallel with more tasks than jobs available' '
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test-run-command run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
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test_cmp expect actual
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'
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cat >expect <<-EOF
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preloaded output of a child
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asking for a quick stop
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preloaded output of a child
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asking for a quick stop
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preloaded output of a child
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asking for a quick stop
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EOF
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test_expect_success 'run_command is asked to abort gracefully' '
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test-run-command run-command-abort 3 false 2>actual &&
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test_cmp expect actual
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'
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cat >expect <<-EOF
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no further jobs available
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EOF
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test_expect_success 'run_command outputs ' '
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test-run-command run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" 2>actual &&
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test_cmp expect actual
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'
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2010-01-10 16:11:22 +03:00
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test_done
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