tests/test-impexp-branch.t

checknlink: return False if .hgtmp file preexists (issue2517)

If os_link fails on Windows, errno is always errno.EINVAL,
so we can't really say if the testlink could not be created
because (a) the FS doesn't support hardlinks or (b) there
is a leaked .hgtmp file lying around from a previous crashed
run.

So let's err on the safe side, keep the code simple and assume
we can't detect hardlinks in both cases.

  $ cat >findbranch.py <<EOF
  > import re, sys
  > 
  > head_re = re.compile('^#(?:(?:\\s+([A-Za-z][A-Za-z0-9_]*)(?:\\s.*)?)|(?:\\s*))$')
  > 
  > for line in sys.stdin:
  >     hmatch = head_re.match(line)
  >     if not hmatch:
  >         sys.exit(1)
  >     if hmatch.group(1) == 'Branch':
  >         sys.exit(0)
  > sys.exit(1)
  > EOF
  $ hg init a
  $ cd a
  $ echo "Rev 1" >rev
  $ hg add rev
  $ hg commit -m "No branch."
  $ hg branch abranch
  marked working directory as branch abranch
  $ echo "Rev  2" >rev
  $ hg commit -m "With branch."
  $ if hg export 0 | python ../findbranch.py; then
  >     echo "Export of default branch revision has Branch header" 1>&2
  >     exit 1
  > fi
  $ if hg export 1 | python ../findbranch.py; then
  >     :  # Do nothing
  > else
  >     echo "Export of branch revision is missing Branch header" 1>&2
  >     exit 1
  > fi

Make sure import still works with branch information in patches.

  $ cd ..
  $ hg init b
  $ cd b
  $ hg -R ../a export 0 | hg import -
  applying patch from stdin
  $ hg -R ../a export 1 | hg import -
  applying patch from stdin
  $ cd ..
  $ rm -rf b
  $ hg init b
  $ cd b
  $ hg -R ../a export 0 | hg import --exact -
  applying patch from stdin
  $ hg -R ../a export 1 | hg import --exact -
  applying patch from stdin