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# This Mercurial extension prevents users from adding:
# * filenames that differ only by case (i.e. 'FOO' and 'foo')
# * Windows-reserved filenames.
#
# Some filesystems cannot handle situations where files differ only by case.
# If such files are present (added from a filesystem that doesn't have this
# limitation) Mercurial will report a case-folding collision when the user
# tries to update. For more information, please see:
# http://mercurial.selenic.com/wiki/CaseFolding
#
# The operations that caseguard currently handles are 'add' and 'addremove'.
#
# To enable the "caseguard" extension globally, put these lines in your
# ~/.hgrc:
# [extensions]
# caseguard = /path/to/caseguard.py
#
# You may optionally add a section in the config file that specifies what
# options you want to have always enabled:
#
# [caseguard]
# override = true
# nowincheck = true
#
# You cannot enable -U/--unguard in the config file since this effectively
# disables the extension.
#
# Please note that having override always enabled will revert all commands
# to their normal behaviour. However, if you pass --verbose you will get a
# listing of the files that would cause problems.
#
# NOTE: renaming file1 to FILE1 and running addremove will NOT change what the
# repository tracks. All changes must be committed before caseguard will
# allow files to be added (this means 'hg rm foo; hg add FOO' will fail).
#
# Copyright (C) 2010 - Alexandru Totolici
# http://hackd.net/projects/caseguard/
#
# This software may be used and distributed according to the terms of the
# GNU General Public License version 2 or any later version.
'''guard against case-fold collisions and Windows name incompatibilities'''
import re
from mercurial import commands, extensions, cmdutil, util
from mercurial.i18n import _
casewarn = _('case-collision danger')
namewarn = _('Windows-incompatible filenames detected')
winbanpat = re.compile('((com[1-9](\..*)?)|(lpt[1-9](\..*)?)|(con(\..*)?)|'
'(aux(\..*)?)|''(prn(\..*)?)|(nul(\..*)?)|(clock\$))\Z', re.IGNORECASE)
badchars = re.compile('(^ )|\\\|\?|\*|\:|\||\"|\<|\>|((\.|\ )$)')
def _wincheck(ui, f, loglevel=None):
if loglevel == None:
loglevel = ui.note
if winbanpat.match(f):
loglevel(_('%s is a reserved name on Windows\n') % f)
return True
return False
def _charcheck(ui, f, loglevel=None):
if loglevel==None:
loglevel = ui.note
if badchars.search(f):
loglevel(_('%s contains Windows-illegal characters\n') % f)
return True
return False
def _casecollide(ui, repo, *pats, **opts):
'''check the case of the given file against the repository. Return True
on collisions and (optionally) print a list of problem-files.'''
reserved = False
colliding = False
casefold = False
override = opts['override'] or ui.configbool('caseguard', 'override')
nowinchk = opts['nowincheck'] or ui.configbool('caseguard', 'nowincheck')
if len(set(s.lower() for s in pats)) != len(pats):
colliding = True
ui.note(_('file list contains a possible case-fold collision\n'))
added = repo.status()[1] + repo.status()[3]
exclst = [item[0] for item in repo['.'].manifest().iteritems()] + added
chklst = [item.lower() for item in exclst]
mtch = dict(zip(chklst, exclst))
m = cmdutil.match(repo, pats, opts)
for f in repo.walk(m):
flwr = f.lower()
reserved = _wincheck(ui, f) or _charcheck(ui, f) or reserved
if f not in repo.dirstate and f not in exclst and flwr in mtch:
colliding = True
ui.note(_('adding %s may cause a case-fold collision with %s\n') %
(f, mtch[flwr]))
mtch[flwr] = f
casefold = not override and ((reserved and not nowinchk) or colliding)
return casefold, colliding, reserved and not nowinchk
def reallyadd(orig, ui, repo, *pats, **opts):
'''wrap the add command so it enforces that filenames differ in
more than just case
'''
if opts['unguard']:
return orig(ui, repo, *pats, **opts)
casefold, collision, reserved = _casecollide(ui, repo, *pats, **opts)
if casefold:
if reserved and collision:
raise util.Abort('\n\t* ' + namewarn + '\n\t* ' + casewarn)
elif reserved:
raise util.Abort(namewarn)
elif collision:
raise util.Abort(casewarn)
return 255
else:
return orig(ui, repo, *pats, **opts)
def casecheck(ui, repo, *pats, **opts):
if not repo.local():
ui.note(_('Only local repositories can be checked'))
return
'''check an existing local repository for filename issues (caseguard)'''
m = cmdutil.match(repo, pats, opts)
seen = dict()
for f in repo.walk(m):
if f in repo.dirstate:
badname = _wincheck(ui, f, ui.status) or \
_charcheck(ui, f, ui.status)
if f.lower() in seen:
ui.status(_('%s collides with %s\n') % (f, seen[f.lower()]))
else:
seen[f.lower()] = f
if not badname:
ui.note(_('\t[OK] %s\n') % f)
wraplist = [extensions.wrapcommand(commands.table, 'add', reallyadd),
extensions.wrapcommand(commands.table, 'addremove', reallyadd)]
for wrapcmd in wraplist:
wrapcmd[1].append(('o', 'override', False, _('add files regardless of'
' possible case-collision problems')))
wrapcmd[1].append(('w', 'nowincheck', False, _('do not check'
' filenames for Windows incompatibilities')))
wrapcmd[1].append(('U', 'unguard', False, _('completely skip checks'
' related to case-collision problems')))
cmdtable = {
'casecheck': (casecheck, [], 'check the repository for filename issues')}
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