tests/test-check-code-hg.py

filectx: fix cmp() of file starting with '\1\n'

If file data starts with '\1\n', it will be escaped in the revlog to
create an empty metadata block, thus adding four bytes to the size in
the revlog size index. There's no way to detect that this has happened
in filelog.size() faster than decompressing each revision [1].

For filectx.cmp(), we have the size of the file in the working directory
available. If it differs by exactly four bytes, it may be this case, so
do a full comparison.

 [1]: http://markmail.org/message/5akdbmmqx7vq2fsg

# Pass all working directory files through check-code.py

import sys, os, imp
rootdir = os.path.abspath(os.path.join(os.path.dirname(sys.argv[0]), '..'))
if not os.path.isdir(os.path.join(rootdir, '.hg')):
    sys.stderr.write('skipped: cannot check code on non-repository sources\n')
    sys.exit(80)

checkpath = os.path.join(rootdir, 'contrib/check-code.py')
checkcode = imp.load_source('checkcode', checkpath)

from mercurial import hg, ui
u = ui.ui()
repo = hg.repository(u, rootdir)
checked = 0
wctx = repo[None]
for f in wctx:
    # ignore removed and unknown files
    if f not in wctx:
        continue
    checked += 1
    checkcode.checkfile(os.path.join(rootdir, f))
if not checked:
    sys.stderr.write('no file checked!\n')