# shelve.py - save/restore working directory state # # Copyright 2013 Facebook, Inc. # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """save and restore changes to the working directory The "hg shelve" command saves changes made to the working directory and reverts those changes, resetting the working directory to a clean state. Later on, the "hg unshelve" command restores the changes saved by "hg shelve". Changes can be restored even after updating to a different parent, in which case Mercurial's merge machinery will resolve any conflicts if necessary. You can have more than one shelved change outstanding at a time; each shelved change has a distinct name. For details, see the help for "hg shelve". """ from mercurial.i18n import _ from mercurial.node import nullid, nullrev, bin, hex from mercurial import changegroup, cmdutil, scmutil, phases, commands from mercurial import error, hg, mdiff, merge, patch, repair, util from mercurial import templatefilters, changegroup from mercurial import lock as lockmod from hgext import rebase import errno cmdtable = {} command = cmdutil.command(cmdtable) testedwith = 'internal' class shelvedfile(object): """Helper for the file storing a single shelve Handles common functions on shelve files (.hg/.files/.patch) using the vfs layer""" def __init__(self, repo, name, filetype=None): self.repo = repo self.name = name self.vfs = scmutil.vfs(repo.join('shelved')) if filetype: self.fname = name + '.' + filetype else: self.fname = name def exists(self): return self.vfs.exists(self.fname) def filename(self): return self.vfs.join(self.fname) def unlink(self): util.unlink(self.filename()) def stat(self): return self.vfs.stat(self.fname) def opener(self, mode='rb'): try: return self.vfs(self.fname, mode) except IOError, err: if err.errno != errno.ENOENT: raise raise util.Abort(_("shelved change '%s' not found") % self.name) class shelvedstate(object): """Handle persistence during unshelving operations. Handles saving and restoring a shelved state. Ensures that different versions of a shelved state are possible and handles them appropriately. """ _version = 1 _filename = 'shelvedstate' @classmethod def load(cls, repo): fp = repo.opener(cls._filename) try: version = int(fp.readline().strip()) if version != cls._version: raise util.Abort(_('this version of shelve is incompatible ' 'with the version used in this repo')) name = fp.readline().strip() wctx = fp.readline().strip() pendingctx = fp.readline().strip() parents = [bin(h) for h in fp.readline().split()] stripnodes = [bin(h) for h in fp.readline().split()] finally: fp.close() obj = cls() obj.name = name obj.wctx = repo[bin(wctx)] obj.pendingctx = repo[bin(pendingctx)] obj.parents = parents obj.stripnodes = stripnodes return obj @classmethod def save(cls, repo, name, originalwctx, pendingctx, stripnodes): fp = repo.opener(cls._filename, 'wb') fp.write('%i\n' % cls._version) fp.write('%s\n' % name) fp.write('%s\n' % hex(originalwctx.node())) fp.write('%s\n' % hex(pendingctx.node())) fp.write('%s\n' % ' '.join([hex(p) for p in repo.dirstate.parents()])) fp.write('%s\n' % ' '.join([hex(n) for n in stripnodes])) fp.close() @classmethod def clear(cls, repo): util.unlinkpath(repo.join(cls._filename), ignoremissing=True) def createcmd(ui, repo, pats, opts): """subcommand that creates a new shelve""" def publicancestors(ctx): """Compute the public ancestors of a commit. Much faster than the revset ancestors(ctx) & draft()""" seen = set([nullrev]) visit = util.deque() visit.append(ctx) while visit: ctx = visit.popleft() yield ctx.node() for parent in ctx.parents(): rev = parent.rev() if rev not in seen: seen.add(rev) if parent.mutable(): visit.append(parent) wctx = repo[None] parents = wctx.parents() if len(parents) > 1: raise util.Abort(_('cannot shelve while merging')) parent = parents[0] # we never need the user, so we use a generic user for all shelve operations user = 'shelve@localhost' label = repo._bookmarkcurrent or parent.branch() or 'default' # slashes aren't allowed in filenames, therefore we rename it label = label.replace('/', '_') def gennames(): yield label for i in xrange(1, 100): yield '%s-%02d' % (label, i) shelvedfiles = [] def commitfunc(ui, repo, message, match, opts): # check modified, added, removed, deleted only for flist in repo.status(match=match)[:4]: shelvedfiles.extend(flist) hasmq = util.safehasattr(repo, 'mq') if hasmq: saved, repo.mq.checkapplied = repo.mq.checkapplied, False try: return repo.commit(message, user, opts.get('date'), match) finally: if hasmq: repo.mq.checkapplied = saved if parent.node() != nullid: desc = "changes to '%s'" % parent.description().split('\n', 1)[0] else: desc = '(changes in empty repository)' if not opts['message']: opts['message'] = desc name = opts['name'] wlock = lock = tr = bms = None try: wlock = repo.wlock() lock = repo.lock() bms = repo._bookmarks.copy() # use an uncommitted transaction to generate the bundle to avoid # pull races. ensure we don't print the abort message to stderr. tr = repo.transaction('commit', report=lambda x: None) if name: if shelvedfile(repo, name, 'hg').exists(): raise util.Abort(_("a shelved change named '%s' already exists") % name) else: for n in gennames(): if not shelvedfile(repo, n, 'hg').exists(): name = n break else: raise util.Abort(_("too many shelved changes named '%s'") % label) # ensure we are not creating a subdirectory or a hidden file if '/' in name or '\\' in name: raise util.Abort(_('shelved change names may not contain slashes')) if name.startswith('.'): raise util.Abort(_("shelved change names may not start with '.'")) node = cmdutil.commit(ui, repo, commitfunc, pats, opts) if not node: stat = repo.status(match=scmutil.match(repo[None], pats, opts)) if stat[3]: ui.status(_("nothing changed (%d missing files, see " "'hg status')\n") % len(stat[3])) else: ui.status(_("nothing changed\n")) return 1 phases.retractboundary(repo, phases.secret, [node]) fp = shelvedfile(repo, name, 'files').opener('wb') fp.write('\0'.join(shelvedfiles)) bases = list(publicancestors(repo[node])) cg = changegroup.changegroupsubset(repo, bases, [node], 'shelve') changegroup.writebundle(cg, shelvedfile(repo, name, 'hg').filename(), 'HG10UN') cmdutil.export(repo, [node], fp=shelvedfile(repo, name, 'patch').opener('wb'), opts=mdiff.diffopts(git=True)) if ui.formatted(): desc = util.ellipsis(desc, ui.termwidth()) ui.status(_('shelved as %s\n') % name) hg.update(repo, parent.node()) finally: if bms: # restore old bookmarks repo._bookmarks.update(bms) repo._bookmarks.write() if tr: tr.abort() lockmod.release(lock, wlock) def cleanupcmd(ui, repo): """subcommand that deletes all shelves""" wlock = None try: wlock = repo.wlock() for (name, _) in repo.vfs.readdir('shelved'): suffix = name.rsplit('.', 1)[-1] if suffix in ('hg', 'files', 'patch'): shelvedfile(repo, name).unlink() finally: lockmod.release(wlock) def deletecmd(ui, repo, pats): """subcommand that deletes a specific shelve""" if not pats: raise util.Abort(_('no shelved changes specified!')) wlock = None try: wlock = repo.wlock() try: for name in pats: for suffix in 'hg files patch'.split(): shelvedfile(repo, name, suffix).unlink() except OSError, err: if err.errno != errno.ENOENT: raise raise util.Abort(_("shelved change '%s' not found") % name) finally: lockmod.release(wlock) def listshelves(repo): """return all shelves in repo as list of (time, filename)""" try: names = repo.vfs.readdir('shelved') except OSError, err: if err.errno != errno.ENOENT: raise return [] info = [] for (name, _) in names: pfx, sfx = name.rsplit('.', 1) if not pfx or sfx != 'patch': continue st = shelvedfile(repo, name).stat() info.append((st.st_mtime, shelvedfile(repo, pfx).filename())) return sorted(info, reverse=True) def listcmd(ui, repo, pats, opts): """subcommand that displays the list of shelves""" pats = set(pats) width = 80 if not ui.plain(): width = ui.termwidth() namelabel = 'shelve.newest' for mtime, name in listshelves(repo): sname = util.split(name)[1] if pats and sname not in pats: continue ui.write(sname, label=namelabel) namelabel = 'shelve.name' if ui.quiet: ui.write('\n') continue ui.write(' ' * (16 - len(sname))) used = 16 age = '(%s)' % templatefilters.age(util.makedate(mtime), abbrev=True) ui.write(age, label='shelve.age') ui.write(' ' * (12 - len(age))) used += 12 fp = open(name + '.patch', 'rb') try: while True: line = fp.readline() if not line: break if not line.startswith('#'): desc = line.rstrip() if ui.formatted(): desc = util.ellipsis(desc, width - used) ui.write(desc) break ui.write('\n') if not (opts['patch'] or opts['stat']): continue difflines = fp.readlines() if opts['patch']: for chunk, label in patch.difflabel(iter, difflines): ui.write(chunk, label=label) if opts['stat']: for chunk, label in patch.diffstatui(difflines, width=width, git=True): ui.write(chunk, label=label) finally: fp.close() def checkparents(repo, state): """check parent while resuming an unshelve""" if state.parents != repo.dirstate.parents(): raise util.Abort(_('working directory parents do not match unshelve ' 'state')) def pathtofiles(repo, files): cwd = repo.getcwd() return [repo.pathto(f, cwd) for f in files] def unshelveabort(ui, repo, state, opts): """subcommand that abort an in-progress unshelve""" wlock = repo.wlock() lock = None try: checkparents(repo, state) util.rename(repo.join('unshelverebasestate'), repo.join('rebasestate')) try: rebase.rebase(ui, repo, **{ 'abort' : True }) except Exception: util.rename(repo.join('rebasestate'), repo.join('unshelverebasestate')) raise lock = repo.lock() mergefiles(ui, repo, state.wctx, state.pendingctx) repair.strip(ui, repo, state.stripnodes, backup='none', topic='shelve') shelvedstate.clear(repo) ui.warn(_("unshelve of '%s' aborted\n") % state.name) finally: lockmod.release(lock, wlock) def mergefiles(ui, repo, wctx, shelvectx): """updates to wctx and merges the changes from shelvectx into the dirstate.""" oldquiet = ui.quiet try: ui.quiet = True hg.update(repo, wctx.node()) files = [] files.extend(shelvectx.files()) files.extend(shelvectx.parents()[0].files()) # revert will overwrite unknown files, so move them out of the way m, a, r, d, u = repo.status(unknown=True)[:5] for file in u: if file in files: util.rename(file, file + ".orig") cmdutil.revert(ui, repo, shelvectx, repo.dirstate.parents(), *pathtofiles(repo, files), **{'no_backup': True}) finally: ui.quiet = oldquiet def unshelvecleanup(ui, repo, name, opts): """remove related files after an unshelve""" if not opts['keep']: for filetype in 'hg files patch'.split(): shelvedfile(repo, name, filetype).unlink() def unshelvecontinue(ui, repo, state, opts): """subcommand to continue an in-progress unshelve""" # We're finishing off a merge. First parent is our original # parent, second is the temporary "fake" commit we're unshelving. wlock = repo.wlock() lock = None try: checkparents(repo, state) ms = merge.mergestate(repo) if [f for f in ms if ms[f] == 'u']: raise util.Abort( _("unresolved conflicts, can't continue"), hint=_("see 'hg resolve', then 'hg unshelve --continue'")) lock = repo.lock() util.rename(repo.join('unshelverebasestate'), repo.join('rebasestate')) try: rebase.rebase(ui, repo, **{ 'continue' : True }) except Exception: util.rename(repo.join('rebasestate'), repo.join('unshelverebasestate')) raise shelvectx = repo['tip'] if not shelvectx in state.pendingctx.children(): # rebase was a no-op, so it produced no child commit shelvectx = state.pendingctx mergefiles(ui, repo, state.wctx, shelvectx) state.stripnodes.append(shelvectx.node()) repair.strip(ui, repo, state.stripnodes, backup='none', topic='shelve') shelvedstate.clear(repo) unshelvecleanup(ui, repo, state.name, opts) ui.status(_("unshelve of '%s' complete\n") % state.name) finally: lockmod.release(lock, wlock) @command('unshelve', [('a', 'abort', None, _('abort an incomplete unshelve operation')), ('c', 'continue', None, _('continue an incomplete unshelve operation')), ('', 'keep', None, _('keep shelve after unshelving'))], _('hg unshelve [SHELVED]')) def unshelve(ui, repo, *shelved, **opts): """restore a shelved change to the working directory This command accepts an optional name of a shelved change to restore. If none is given, the most recent shelved change is used. If a shelved change is applied successfully, the bundle that contains the shelved changes is deleted afterwards. Since you can restore a shelved change on top of an arbitrary commit, it is possible that unshelving will result in a conflict between your changes and the commits you are unshelving onto. If this occurs, you must resolve the conflict, then use ``--continue`` to complete the unshelve operation. (The bundle will not be deleted until you successfully complete the unshelve.) (Alternatively, you can use ``--abort`` to abandon an unshelve that causes a conflict. This reverts the unshelved changes, and does not delete the bundle.) """ abortf = opts['abort'] continuef = opts['continue'] if not abortf and not continuef: cmdutil.checkunfinished(repo) if abortf or continuef: if abortf and continuef: raise util.Abort(_('cannot use both abort and continue')) if shelved: raise util.Abort(_('cannot combine abort/continue with ' 'naming a shelved change')) try: state = shelvedstate.load(repo) except IOError, err: if err.errno != errno.ENOENT: raise raise util.Abort(_('no unshelve operation underway')) if abortf: return unshelveabort(ui, repo, state, opts) elif continuef: return unshelvecontinue(ui, repo, state, opts) elif len(shelved) > 1: raise util.Abort(_('can only unshelve one change at a time')) elif not shelved: shelved = listshelves(repo) if not shelved: raise util.Abort(_('no shelved changes to apply!')) basename = util.split(shelved[0][1])[1] ui.status(_("unshelving change '%s'\n") % basename) else: basename = shelved[0] if not shelvedfile(repo, basename, 'files').exists(): raise util.Abort(_("shelved change '%s' not found") % basename) oldquiet = ui.quiet wlock = lock = tr = None try: lock = repo.lock() wlock = repo.wlock() tr = repo.transaction('unshelve', report=lambda x: None) oldtiprev = len(repo) pctx = repo['.'] tmpwctx = pctx # The goal is to have a commit structure like so: # ...-> pctx -> tmpwctx -> shelvectx # where tmpwctx is an optional commit with the user's pending changes # and shelvectx is the unshelved changes. Then we merge it all down # to the original pctx. # Store pending changes in a commit m, a, r, d = repo.status()[:4] if m or a or r or d: ui.status(_("temporarily committing pending changes " "(restore with 'hg unshelve --abort')\n")) def commitfunc(ui, repo, message, match, opts): hasmq = util.safehasattr(repo, 'mq') if hasmq: saved, repo.mq.checkapplied = repo.mq.checkapplied, False try: return repo.commit(message, 'shelve@localhost', opts.get('date'), match) finally: if hasmq: repo.mq.checkapplied = saved tempopts = {} tempopts['message'] = "pending changes temporary commit" ui.quiet = True node = cmdutil.commit(ui, repo, commitfunc, [], tempopts) tmpwctx = repo[node] try: ui.quiet = True fp = shelvedfile(repo, basename, 'hg').opener() gen = changegroup.readbundle(fp, fp.name) changegroup.addchangegroup(repo, gen, 'unshelve', 'bundle:' + fp.name) nodes = [ctx.node() for ctx in repo.set('%d:', oldtiprev)] phases.retractboundary(repo, phases.secret, nodes) finally: fp.close() ui.quiet = oldquiet shelvectx = repo['tip'] # If the shelve is not immediately on top of the commit # we'll be merging with, rebase it to be on top. if tmpwctx.node() != shelvectx.parents()[0].node(): ui.status(_('rebasing shelved changes\n')) try: rebase.rebase(ui, repo, **{ 'rev' : [shelvectx.rev()], 'dest' : str(tmpwctx.rev()), 'keep' : True, }) except error.InterventionRequired: tr.close() stripnodes = [repo.changelog.node(rev) for rev in xrange(oldtiprev, len(repo))] shelvedstate.save(repo, basename, pctx, tmpwctx, stripnodes) util.rename(repo.join('rebasestate'), repo.join('unshelverebasestate')) raise error.InterventionRequired( _("unresolved conflicts (see 'hg resolve', then " "'hg unshelve --continue')")) # refresh ctx after rebase completes shelvectx = repo['tip'] if not shelvectx in tmpwctx.children(): # rebase was a no-op, so it produced no child commit shelvectx = tmpwctx mergefiles(ui, repo, pctx, shelvectx) shelvedstate.clear(repo) # The transaction aborting will strip all the commits for us, # but it doesn't update the inmemory structures, so addchangegroup # hooks still fire and try to operate on the missing commits. # Clean up manually to prevent this. repo.unfiltered().changelog.strip(oldtiprev, tr) unshelvecleanup(ui, repo, basename, opts) finally: ui.quiet = oldquiet if tr: tr.release() lockmod.release(lock, wlock) @command('shelve', [('A', 'addremove', None, _('mark new/missing files as added/removed before shelving')), ('', 'cleanup', None, _('delete all shelved changes')), ('', 'date', '', _('shelve with the specified commit date'), _('DATE')), ('d', 'delete', None, _('delete the named shelved change(s)')), ('l', 'list', None, _('list current shelves')), ('m', 'message', '', _('use text as shelve message'), _('TEXT')), ('n', 'name', '', _('use the given name for the shelved commit'), _('NAME')), ('p', 'patch', None, _('show patch')), ('', 'stat', None, _('output diffstat-style summary of changes'))] + commands.walkopts, _('hg shelve [OPTION]... [FILE]...')) def shelvecmd(ui, repo, *pats, **opts): '''save and set aside changes from the working directory Shelving takes files that "hg status" reports as not clean, saves the modifications to a bundle (a shelved change), and reverts the files so that their state in the working directory becomes clean. To restore these changes to the working directory, using "hg unshelve"; this will work even if you switch to a different commit. When no files are specified, "hg shelve" saves all not-clean files. If specific files or directories are named, only changes to those files are shelved. Each shelved change has a name that makes it easier to find later. The name of a shelved change defaults to being based on the active bookmark, or if there is no active bookmark, the current named branch. To specify a different name, use ``--name``. To see a list of existing shelved changes, use the ``--list`` option. For each shelved change, this will print its name, age, and description; use ``--patch`` or ``--stat`` for more details. To delete specific shelved changes, use ``--delete``. To delete all shelved changes, use ``--cleanup``. ''' cmdutil.checkunfinished(repo) def checkopt(opt, incompatible): if opts[opt]: for i in incompatible.split(): if opts[i]: raise util.Abort(_("options '--%s' and '--%s' may not be " "used together") % (opt, i)) return True if checkopt('cleanup', 'addremove delete list message name patch stat'): if pats: raise util.Abort(_("cannot specify names when using '--cleanup'")) return cleanupcmd(ui, repo) elif checkopt('delete', 'addremove cleanup list message name patch stat'): return deletecmd(ui, repo, pats) elif checkopt('list', 'addremove cleanup delete message name'): return listcmd(ui, repo, pats, opts) else: for i in ('patch', 'stat'): if opts[i]: raise util.Abort(_("option '--%s' may not be " "used when shelving a change") % (i,)) return createcmd(ui, repo, pats, opts) def extsetup(ui): cmdutil.unfinishedstates.append( [shelvedstate._filename, False, False, _('unshelve already in progress'), _("use 'hg unshelve --continue' or 'hg unshelve --abort'")])