Bug 1415335 - Move Windows line endings detection to configure; r=nalexander

This doesn't need to be in client.mk.

Also, we inline the info to help people correct the failure, as this
results in a better user experience.

MozReview-Commit-ID: KURL3RIGzKf

--HG--
extra : rebase_source : dc79d3f6aa4e91a12cab0e26d5fc0a3e15afa833
extra : source : 2eceb30625acd8cfadda0baa6326a7e9fd07dece

build/moz.configure/init.configure

@@ -14,6 +14,7 @@ option(env='DIST', nargs=1, help='DIST directory')
 
 
 @depends('--help', 'DIST')
+@imports(_from='__builtin__', _import='open')
 @imports(_from='os.path', _import='exists')
 def check_build_environment(help, dist):
     topobjdir = os.path.realpath(os.path.abspath('.'))
@@ -61,6 +62,29 @@ def check_build_environment(help, dist):
             '  ***'
             )
 
+    # Check for CRLF line endings.
+    with open(os.path.join(topsrcdir, 'configure.py'), 'rb') as fh:
+        data = fh.read()
+        if '\r' in data:
+            die('\n ***\n'
+                ' * The source tree appears to have Windows-style line endings.\n'
+                ' *\n'
+                ' * If using Git, Git is likely configured to use Windows-style\n'
+                ' * line endings.\n'
+                ' *\n'
+                ' * To convert the working copy to UNIX-style line endings, run\n'
+                ' * the following:\n'
+                ' *\n'
+                ' * $ git config core.autocrlf false\n'
+                ' * $ git config core.eof lf\n'
+                ' * $ git rm --cached -r .\n'
+                ' * $ git reset --hard\n'
+                ' *\n'
+                ' * If not using Git, the tool you used to obtain the source\n'
+                ' * code likely converted files to Windows line endings. See\n'
+                ' * usage information for that tool for more.\n'
+                ' ***')
+
     # Check for a couple representative files in the source tree
     conflict_files = [
         '*         %s' % f for f in ('Makefile', 'config/autoconf.mk')

client.mk

@@ -56,14 +56,6 @@ CONFIG_GUESS := $(shell $(TOPSRCDIR)/build/autoconf/config.guess)
 # Windows checks.
 ifneq (,$(findstring mingw,$(CONFIG_GUESS)))
 
-# check for CRLF line endings
-ifneq (0,$(shell $(PERL) -e 'binmode(STDIN); while (<STDIN>) { if (/\r/) { print "1"; exit } } print "0"' < $(TOPSRCDIR)/client.mk))
-$(error This source tree appears to have Windows-style line endings. To \
-convert it to Unix-style line endings, check \
-"https://developer.mozilla.org/en-US/docs/Developer_Guide/Mozilla_build_FAQ\#Win32-specific_questions" \
-for a workaround of this issue.)
-endif
-
 # Set this for baseconfig.mk
 HOST_OS_ARCH=WINNT
 endif