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@@ -1,563 +1,563 b'' | |||||
1 | # transaction.py - simple journaling scheme for mercurial |
|
1 | # transaction.py - simple journaling scheme for mercurial | |
2 | # |
|
2 | # | |
3 | # This transaction scheme is intended to gracefully handle program |
|
3 | # This transaction scheme is intended to gracefully handle program | |
4 | # errors and interruptions. More serious failures like system crashes |
|
4 | # errors and interruptions. More serious failures like system crashes | |
5 | # can be recovered with an fsck-like tool. As the whole repository is |
|
5 | # can be recovered with an fsck-like tool. As the whole repository is | |
6 | # effectively log-structured, this should amount to simply truncating |
|
6 | # effectively log-structured, this should amount to simply truncating | |
7 | # anything that isn't referenced in the changelog. |
|
7 | # anything that isn't referenced in the changelog. | |
8 | # |
|
8 | # | |
9 | # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> |
|
9 | # Copyright 2005, 2006 Matt Mackall <mpm@selenic.com> | |
10 | # |
|
10 | # | |
11 | # This software may be used and distributed according to the terms of the |
|
11 | # This software may be used and distributed according to the terms of the | |
12 | # GNU General Public License version 2 or any later version. |
|
12 | # GNU General Public License version 2 or any later version. | |
13 |
|
13 | |||
14 | from __future__ import absolute_import |
|
14 | from __future__ import absolute_import | |
15 |
|
15 | |||
16 | import errno |
|
16 | import errno | |
17 |
|
17 | |||
18 | from .i18n import _ |
|
18 | from .i18n import _ | |
19 | from . import ( |
|
19 | from . import ( | |
20 | error, |
|
20 | error, | |
21 | util, |
|
21 | util, | |
22 | ) |
|
22 | ) | |
23 |
|
23 | |||
24 | version = 2 |
|
24 | version = 2 | |
25 |
|
25 | |||
26 | def active(func): |
|
26 | def active(func): | |
27 | def _active(self, *args, **kwds): |
|
27 | def _active(self, *args, **kwds): | |
28 | if self.count == 0: |
|
28 | if self.count == 0: | |
29 | raise error.Abort(_( |
|
29 | raise error.Abort(_( | |
30 | 'cannot use transaction when it is already committed/aborted')) |
|
30 | 'cannot use transaction when it is already committed/aborted')) | |
31 | return func(self, *args, **kwds) |
|
31 | return func(self, *args, **kwds) | |
32 | return _active |
|
32 | return _active | |
33 |
|
33 | |||
34 | def _playback(journal, report, opener, vfsmap, entries, backupentries, |
|
34 | def _playback(journal, report, opener, vfsmap, entries, backupentries, | |
35 | unlink=True): |
|
35 | unlink=True): | |
36 | for f, o, _ignore in entries: |
|
36 | for f, o, _ignore in entries: | |
37 | if o or not unlink: |
|
37 | if o or not unlink: | |
38 | try: |
|
38 | try: | |
39 | fp = opener(f, 'a') |
|
39 | fp = opener(f, 'a') | |
40 | fp.truncate(o) |
|
40 | fp.truncate(o) | |
41 | fp.close() |
|
41 | fp.close() | |
42 | except IOError: |
|
42 | except IOError: | |
43 | report(_("failed to truncate %s\n") % f) |
|
43 | report(_("failed to truncate %s\n") % f) | |
44 | raise |
|
44 | raise | |
45 | else: |
|
45 | else: | |
46 | try: |
|
46 | try: | |
47 | opener.unlink(f) |
|
47 | opener.unlink(f) | |
48 | except (IOError, OSError) as inst: |
|
48 | except (IOError, OSError) as inst: | |
49 | if inst.errno != errno.ENOENT: |
|
49 | if inst.errno != errno.ENOENT: | |
50 | raise |
|
50 | raise | |
51 |
|
51 | |||
52 | backupfiles = [] |
|
52 | backupfiles = [] | |
53 | for l, f, b, c in backupentries: |
|
53 | for l, f, b, c in backupentries: | |
54 | if l not in vfsmap and c: |
|
54 | if l not in vfsmap and c: | |
55 | report("couldn't handle %s: unknown cache location %s\n" |
|
55 | report("couldn't handle %s: unknown cache location %s\n" | |
56 | % (b, l)) |
|
56 | % (b, l)) | |
57 | vfs = vfsmap[l] |
|
57 | vfs = vfsmap[l] | |
58 | try: |
|
58 | try: | |
59 | if f and b: |
|
59 | if f and b: | |
60 | filepath = vfs.join(f) |
|
60 | filepath = vfs.join(f) | |
61 | backuppath = vfs.join(b) |
|
61 | backuppath = vfs.join(b) | |
62 | try: |
|
62 | try: | |
63 | util.copyfile(backuppath, filepath) |
|
63 | util.copyfile(backuppath, filepath) | |
64 | backupfiles.append(b) |
|
64 | backupfiles.append(b) | |
65 | except IOError: |
|
65 | except IOError: | |
66 | report(_("failed to recover %s\n") % f) |
|
66 | report(_("failed to recover %s\n") % f) | |
67 | else: |
|
67 | else: | |
68 | target = f or b |
|
68 | target = f or b | |
69 | try: |
|
69 | try: | |
70 | vfs.unlink(target) |
|
70 | vfs.unlink(target) | |
71 | except (IOError, OSError) as inst: |
|
71 | except (IOError, OSError) as inst: | |
72 | if inst.errno != errno.ENOENT: |
|
72 | if inst.errno != errno.ENOENT: | |
73 | raise |
|
73 | raise | |
74 | except (IOError, OSError, error.Abort) as inst: |
|
74 | except (IOError, OSError, error.Abort) as inst: | |
75 | if not c: |
|
75 | if not c: | |
76 | raise |
|
76 | raise | |
77 |
|
77 | |||
78 | backuppath = "%s.backupfiles" % journal |
|
78 | backuppath = "%s.backupfiles" % journal | |
79 | if opener.exists(backuppath): |
|
79 | if opener.exists(backuppath): | |
80 | opener.unlink(backuppath) |
|
80 | opener.unlink(backuppath) | |
81 | opener.unlink(journal) |
|
81 | opener.unlink(journal) | |
82 | try: |
|
82 | try: | |
83 | for f in backupfiles: |
|
83 | for f in backupfiles: | |
84 | if opener.exists(f): |
|
84 | if opener.exists(f): | |
85 | opener.unlink(f) |
|
85 | opener.unlink(f) | |
86 | except (IOError, OSError, error.Abort) as inst: |
|
86 | except (IOError, OSError, error.Abort) as inst: | |
87 | # only pure backup file remains, it is sage to ignore any error |
|
87 | # only pure backup file remains, it is sage to ignore any error | |
88 | pass |
|
88 | pass | |
89 |
|
89 | |||
90 | class transaction(object): |
|
90 | class transaction(object): | |
91 | def __init__(self, report, opener, vfsmap, journalname, undoname=None, |
|
91 | def __init__(self, report, opener, vfsmap, journalname, undoname=None, | |
92 | after=None, createmode=None, validator=None, releasefn=None): |
|
92 | after=None, createmode=None, validator=None, releasefn=None): | |
93 | """Begin a new transaction |
|
93 | """Begin a new transaction | |
94 |
|
94 | |||
95 | Begins a new transaction that allows rolling back writes in the event of |
|
95 | Begins a new transaction that allows rolling back writes in the event of | |
96 | an exception. |
|
96 | an exception. | |
97 |
|
97 | |||
98 | * `after`: called after the transaction has been committed |
|
98 | * `after`: called after the transaction has been committed | |
99 | * `createmode`: the mode of the journal file that will be created |
|
99 | * `createmode`: the mode of the journal file that will be created | |
100 | * `releasefn`: called after releasing (with transaction and result) |
|
100 | * `releasefn`: called after releasing (with transaction and result) | |
101 | """ |
|
101 | """ | |
102 | self.count = 1 |
|
102 | self.count = 1 | |
103 | self.usages = 1 |
|
103 | self.usages = 1 | |
104 | self.report = report |
|
104 | self.report = report | |
105 | # a vfs to the store content |
|
105 | # a vfs to the store content | |
106 | self.opener = opener |
|
106 | self.opener = opener | |
107 | # a map to access file in various {location -> vfs} |
|
107 | # a map to access file in various {location -> vfs} | |
108 | vfsmap = vfsmap.copy() |
|
108 | vfsmap = vfsmap.copy() | |
109 | vfsmap[''] = opener # set default value |
|
109 | vfsmap[''] = opener # set default value | |
110 | self._vfsmap = vfsmap |
|
110 | self._vfsmap = vfsmap | |
111 | self.after = after |
|
111 | self.after = after | |
112 | self.entries = [] |
|
112 | self.entries = [] | |
113 | self.map = {} |
|
113 | self.map = {} | |
114 | self.journal = journalname |
|
114 | self.journal = journalname | |
115 | self.undoname = undoname |
|
115 | self.undoname = undoname | |
116 | self._queue = [] |
|
116 | self._queue = [] | |
117 | # A callback to validate transaction content before closing it. |
|
117 | # A callback to validate transaction content before closing it. | |
118 | # should raise exception is anything is wrong. |
|
118 | # should raise exception is anything is wrong. | |
119 | # target user is repository hooks. |
|
119 | # target user is repository hooks. | |
120 | if validator is None: |
|
120 | if validator is None: | |
121 | validator = lambda tr: None |
|
121 | validator = lambda tr: None | |
122 | self.validator = validator |
|
122 | self.validator = validator | |
123 | # A callback to do something just after releasing transaction. |
|
123 | # A callback to do something just after releasing transaction. | |
124 | if releasefn is None: |
|
124 | if releasefn is None: | |
125 | releasefn = lambda tr, success: None |
|
125 | releasefn = lambda tr, success: None | |
126 | self.releasefn = releasefn |
|
126 | self.releasefn = releasefn | |
127 |
|
127 | |||
128 | # a dict of arguments to be passed to hooks |
|
128 | # a dict of arguments to be passed to hooks | |
129 | self.hookargs = {} |
|
129 | self.hookargs = {} | |
130 | self.file = opener.open(self.journal, "w") |
|
130 | self.file = opener.open(self.journal, "w") | |
131 |
|
131 | |||
132 | # a list of ('location', 'path', 'backuppath', cache) entries. |
|
132 | # a list of ('location', 'path', 'backuppath', cache) entries. | |
133 | # - if 'backuppath' is empty, no file existed at backup time |
|
133 | # - if 'backuppath' is empty, no file existed at backup time | |
134 | # - if 'path' is empty, this is a temporary transaction file |
|
134 | # - if 'path' is empty, this is a temporary transaction file | |
135 | # - if 'location' is not empty, the path is outside main opener reach. |
|
135 | # - if 'location' is not empty, the path is outside main opener reach. | |
136 | # use 'location' value as a key in a vfsmap to find the right 'vfs' |
|
136 | # use 'location' value as a key in a vfsmap to find the right 'vfs' | |
137 | # (cache is currently unused) |
|
137 | # (cache is currently unused) | |
138 | self._backupentries = [] |
|
138 | self._backupentries = [] | |
139 | self._backupmap = {} |
|
139 | self._backupmap = {} | |
140 | self._backupjournal = "%s.backupfiles" % self.journal |
|
140 | self._backupjournal = "%s.backupfiles" % self.journal | |
141 | self._backupsfile = opener.open(self._backupjournal, 'w') |
|
141 | self._backupsfile = opener.open(self._backupjournal, 'w') | |
142 | self._backupsfile.write('%d\n' % version) |
|
142 | self._backupsfile.write('%d\n' % version) | |
143 |
|
143 | |||
144 | if createmode is not None: |
|
144 | if createmode is not None: | |
145 | opener.chmod(self.journal, createmode & 0o666) |
|
145 | opener.chmod(self.journal, createmode & 0o666) | |
146 | opener.chmod(self._backupjournal, createmode & 0o666) |
|
146 | opener.chmod(self._backupjournal, createmode & 0o666) | |
147 |
|
147 | |||
148 | # hold file generations to be performed on commit |
|
148 | # hold file generations to be performed on commit | |
149 | self._filegenerators = {} |
|
149 | self._filegenerators = {} | |
150 | # hold callback to write pending data for hooks |
|
150 | # hold callback to write pending data for hooks | |
151 | self._pendingcallback = {} |
|
151 | self._pendingcallback = {} | |
152 | # True is any pending data have been written ever |
|
152 | # True is any pending data have been written ever | |
153 | self._anypending = False |
|
153 | self._anypending = False | |
154 | # holds callback to call when writing the transaction |
|
154 | # holds callback to call when writing the transaction | |
155 | self._finalizecallback = {} |
|
155 | self._finalizecallback = {} | |
156 | # hold callback for post transaction close |
|
156 | # hold callback for post transaction close | |
157 | self._postclosecallback = {} |
|
157 | self._postclosecallback = {} | |
158 | # holds callbacks to call during abort |
|
158 | # holds callbacks to call during abort | |
159 | self._abortcallback = {} |
|
159 | self._abortcallback = {} | |
160 |
|
160 | |||
161 | def __del__(self): |
|
161 | def __del__(self): | |
162 | if self.journal: |
|
162 | if self.journal: | |
163 | self._abort() |
|
163 | self._abort() | |
164 |
|
164 | |||
165 | @active |
|
165 | @active | |
166 | def startgroup(self): |
|
166 | def startgroup(self): | |
167 | """delay registration of file entry |
|
167 | """delay registration of file entry | |
168 |
|
168 | |||
169 | This is used by strip to delay vision of strip offset. The transaction |
|
169 | This is used by strip to delay vision of strip offset. The transaction | |
170 | sees either none or all of the strip actions to be done.""" |
|
170 | sees either none or all of the strip actions to be done.""" | |
171 | self._queue.append([]) |
|
171 | self._queue.append([]) | |
172 |
|
172 | |||
173 | @active |
|
173 | @active | |
174 | def endgroup(self): |
|
174 | def endgroup(self): | |
175 | """apply delayed registration of file entry. |
|
175 | """apply delayed registration of file entry. | |
176 |
|
176 | |||
177 | This is used by strip to delay vision of strip offset. The transaction |
|
177 | This is used by strip to delay vision of strip offset. The transaction | |
178 | sees either none or all of the strip actions to be done.""" |
|
178 | sees either none or all of the strip actions to be done.""" | |
179 | q = self._queue.pop() |
|
179 | q = self._queue.pop() | |
180 | for f, o, data in q: |
|
180 | for f, o, data in q: | |
181 | self._addentry(f, o, data) |
|
181 | self._addentry(f, o, data) | |
182 |
|
182 | |||
183 | @active |
|
183 | @active | |
184 | def add(self, file, offset, data=None): |
|
184 | def add(self, file, offset, data=None): | |
185 | """record the state of an append-only file before update""" |
|
185 | """record the state of an append-only file before update""" | |
186 | if file in self.map or file in self._backupmap: |
|
186 | if file in self.map or file in self._backupmap: | |
187 | return |
|
187 | return | |
188 | if self._queue: |
|
188 | if self._queue: | |
189 | self._queue[-1].append((file, offset, data)) |
|
189 | self._queue[-1].append((file, offset, data)) | |
190 | return |
|
190 | return | |
191 |
|
191 | |||
192 | self._addentry(file, offset, data) |
|
192 | self._addentry(file, offset, data) | |
193 |
|
193 | |||
194 | def _addentry(self, file, offset, data): |
|
194 | def _addentry(self, file, offset, data): | |
195 | """add a append-only entry to memory and on-disk state""" |
|
195 | """add a append-only entry to memory and on-disk state""" | |
196 | if file in self.map or file in self._backupmap: |
|
196 | if file in self.map or file in self._backupmap: | |
197 | return |
|
197 | return | |
198 | self.entries.append((file, offset, data)) |
|
198 | self.entries.append((file, offset, data)) | |
199 | self.map[file] = len(self.entries) - 1 |
|
199 | self.map[file] = len(self.entries) - 1 | |
200 | # add enough data to the journal to do the truncate |
|
200 | # add enough data to the journal to do the truncate | |
201 | self.file.write("%s\0%d\n" % (file, offset)) |
|
201 | self.file.write("%s\0%d\n" % (file, offset)) | |
202 | self.file.flush() |
|
202 | self.file.flush() | |
203 |
|
203 | |||
204 | @active |
|
204 | @active | |
205 | def addbackup(self, file, hardlink=True, location=''): |
|
205 | def addbackup(self, file, hardlink=True, location=''): | |
206 | """Adds a backup of the file to the transaction |
|
206 | """Adds a backup of the file to the transaction | |
207 |
|
207 | |||
208 | Calling addbackup() creates a hardlink backup of the specified file |
|
208 | Calling addbackup() creates a hardlink backup of the specified file | |
209 | that is used to recover the file in the event of the transaction |
|
209 | that is used to recover the file in the event of the transaction | |
210 | aborting. |
|
210 | aborting. | |
211 |
|
211 | |||
212 | * `file`: the file path, relative to .hg/store |
|
212 | * `file`: the file path, relative to .hg/store | |
213 | * `hardlink`: use a hardlink to quickly create the backup |
|
213 | * `hardlink`: use a hardlink to quickly create the backup | |
214 | """ |
|
214 | """ | |
215 | if self._queue: |
|
215 | if self._queue: | |
216 | msg = 'cannot use transaction.addbackup inside "group"' |
|
216 | msg = 'cannot use transaction.addbackup inside "group"' | |
217 | raise RuntimeError(msg) |
|
217 | raise RuntimeError(msg) | |
218 |
|
218 | |||
219 | if file in self.map or file in self._backupmap: |
|
219 | if file in self.map or file in self._backupmap: | |
220 | return |
|
220 | return | |
221 | vfs = self._vfsmap[location] |
|
221 | vfs = self._vfsmap[location] | |
222 | dirname, filename = vfs.split(file) |
|
222 | dirname, filename = vfs.split(file) | |
223 | backupfilename = "%s.backup.%s" % (self.journal, filename) |
|
223 | backupfilename = "%s.backup.%s" % (self.journal, filename) | |
224 | backupfile = vfs.reljoin(dirname, backupfilename) |
|
224 | backupfile = vfs.reljoin(dirname, backupfilename) | |
225 | if vfs.exists(file): |
|
225 | if vfs.exists(file): | |
226 | filepath = vfs.join(file) |
|
226 | filepath = vfs.join(file) | |
227 | backuppath = vfs.join(backupfile) |
|
227 | backuppath = vfs.join(backupfile) | |
228 | util.copyfile(filepath, backuppath, hardlink=hardlink) |
|
228 | util.copyfile(filepath, backuppath, hardlink=hardlink) | |
229 | else: |
|
229 | else: | |
230 | backupfile = '' |
|
230 | backupfile = '' | |
231 |
|
231 | |||
232 | self._addbackupentry((location, file, backupfile, False)) |
|
232 | self._addbackupentry((location, file, backupfile, False)) | |
233 |
|
233 | |||
234 | def _addbackupentry(self, entry): |
|
234 | def _addbackupentry(self, entry): | |
235 | """register a new backup entry and write it to disk""" |
|
235 | """register a new backup entry and write it to disk""" | |
236 | self._backupentries.append(entry) |
|
236 | self._backupentries.append(entry) | |
237 | self._backupmap[entry[1]] = len(self._backupentries) - 1 |
|
237 | self._backupmap[entry[1]] = len(self._backupentries) - 1 | |
238 | self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) |
|
238 | self._backupsfile.write("%s\0%s\0%s\0%d\n" % entry) | |
239 | self._backupsfile.flush() |
|
239 | self._backupsfile.flush() | |
240 |
|
240 | |||
241 | @active |
|
241 | @active | |
242 | def registertmp(self, tmpfile, location=''): |
|
242 | def registertmp(self, tmpfile, location=''): | |
243 | """register a temporary transaction file |
|
243 | """register a temporary transaction file | |
244 |
|
244 | |||
245 | Such files will be deleted when the transaction exits (on both |
|
245 | Such files will be deleted when the transaction exits (on both | |
246 | failure and success). |
|
246 | failure and success). | |
247 | """ |
|
247 | """ | |
248 | self._addbackupentry((location, '', tmpfile, False)) |
|
248 | self._addbackupentry((location, '', tmpfile, False)) | |
249 |
|
249 | |||
250 | @active |
|
250 | @active | |
251 | def addfilegenerator(self, genid, filenames, genfunc, order=0, |
|
251 | def addfilegenerator(self, genid, filenames, genfunc, order=0, | |
252 | location=''): |
|
252 | location=''): | |
253 | """add a function to generates some files at transaction commit |
|
253 | """add a function to generates some files at transaction commit | |
254 |
|
254 | |||
255 | The `genfunc` argument is a function capable of generating proper |
|
255 | The `genfunc` argument is a function capable of generating proper | |
256 | content of each entry in the `filename` tuple. |
|
256 | content of each entry in the `filename` tuple. | |
257 |
|
257 | |||
258 | At transaction close time, `genfunc` will be called with one file |
|
258 | At transaction close time, `genfunc` will be called with one file | |
259 | object argument per entries in `filenames`. |
|
259 | object argument per entries in `filenames`. | |
260 |
|
260 | |||
261 | The transaction itself is responsible for the backup, creation and |
|
261 | The transaction itself is responsible for the backup, creation and | |
262 | final write of such file. |
|
262 | final write of such file. | |
263 |
|
263 | |||
264 | The `genid` argument is used to ensure the same set of file is only |
|
264 | The `genid` argument is used to ensure the same set of file is only | |
265 | generated once. Call to `addfilegenerator` for a `genid` already |
|
265 | generated once. Call to `addfilegenerator` for a `genid` already | |
266 | present will overwrite the old entry. |
|
266 | present will overwrite the old entry. | |
267 |
|
267 | |||
268 | The `order` argument may be used to control the order in which multiple |
|
268 | The `order` argument may be used to control the order in which multiple | |
269 | generator will be executed. |
|
269 | generator will be executed. | |
270 |
|
270 | |||
271 | The `location` arguments may be used to indicate the files are located |
|
271 | The `location` arguments may be used to indicate the files are located | |
272 | outside of the the standard directory for transaction. It should match |
|
272 | outside of the the standard directory for transaction. It should match | |
273 | one of the key of the `transaction.vfsmap` dictionary. |
|
273 | one of the key of the `transaction.vfsmap` dictionary. | |
274 | """ |
|
274 | """ | |
275 | # For now, we are unable to do proper backup and restore of custom vfs |
|
275 | # For now, we are unable to do proper backup and restore of custom vfs | |
276 | # but for bookmarks that are handled outside this mechanism. |
|
276 | # but for bookmarks that are handled outside this mechanism. | |
277 | self._filegenerators[genid] = (order, filenames, genfunc, location) |
|
277 | self._filegenerators[genid] = (order, filenames, genfunc, location) | |
278 |
|
278 | |||
279 | def _generatefiles(self, suffix=''): |
|
279 | def _generatefiles(self, suffix=''): | |
280 | # write files registered for generation |
|
280 | # write files registered for generation | |
281 | any = False |
|
281 | any = False | |
282 | for entry in sorted(self._filegenerators.values()): |
|
282 | for entry in sorted(self._filegenerators.values()): | |
283 | any = True |
|
283 | any = True | |
284 | order, filenames, genfunc, location = entry |
|
284 | order, filenames, genfunc, location = entry | |
285 | vfs = self._vfsmap[location] |
|
285 | vfs = self._vfsmap[location] | |
286 | files = [] |
|
286 | files = [] | |
287 | try: |
|
287 | try: | |
288 | for name in filenames: |
|
288 | for name in filenames: | |
289 | name += suffix |
|
289 | name += suffix | |
290 | if suffix: |
|
290 | if suffix: | |
291 | self.registertmp(name, location=location) |
|
291 | self.registertmp(name, location=location) | |
292 | else: |
|
292 | else: | |
293 | self.addbackup(name, location=location) |
|
293 | self.addbackup(name, location=location) | |
294 | files.append(vfs(name, 'w', atomictemp=True)) |
|
294 | files.append(vfs(name, 'w', atomictemp=True)) | |
295 | genfunc(*files) |
|
295 | genfunc(*files) | |
296 | finally: |
|
296 | finally: | |
297 | for f in files: |
|
297 | for f in files: | |
298 | f.close() |
|
298 | f.close() | |
299 | return any |
|
299 | return any | |
300 |
|
300 | |||
301 | @active |
|
301 | @active | |
302 | def find(self, file): |
|
302 | def find(self, file): | |
303 | if file in self.map: |
|
303 | if file in self.map: | |
304 | return self.entries[self.map[file]] |
|
304 | return self.entries[self.map[file]] | |
305 | if file in self._backupmap: |
|
305 | if file in self._backupmap: | |
306 | return self._backupentries[self._backupmap[file]] |
|
306 | return self._backupentries[self._backupmap[file]] | |
307 | return None |
|
307 | return None | |
308 |
|
308 | |||
309 | @active |
|
309 | @active | |
310 | def replace(self, file, offset, data=None): |
|
310 | def replace(self, file, offset, data=None): | |
311 | ''' |
|
311 | ''' | |
312 | replace can only replace already committed entries |
|
312 | replace can only replace already committed entries | |
313 | that are not pending in the queue |
|
313 | that are not pending in the queue | |
314 | ''' |
|
314 | ''' | |
315 |
|
315 | |||
316 | if file not in self.map: |
|
316 | if file not in self.map: | |
317 | raise KeyError(file) |
|
317 | raise KeyError(file) | |
318 | index = self.map[file] |
|
318 | index = self.map[file] | |
319 | self.entries[index] = (file, offset, data) |
|
319 | self.entries[index] = (file, offset, data) | |
320 | self.file.write("%s\0%d\n" % (file, offset)) |
|
320 | self.file.write("%s\0%d\n" % (file, offset)) | |
321 | self.file.flush() |
|
321 | self.file.flush() | |
322 |
|
322 | |||
323 | @active |
|
323 | @active | |
324 | def nest(self): |
|
324 | def nest(self): | |
325 | self.count += 1 |
|
325 | self.count += 1 | |
326 | self.usages += 1 |
|
326 | self.usages += 1 | |
327 | return self |
|
327 | return self | |
328 |
|
328 | |||
329 | def release(self): |
|
329 | def release(self): | |
330 | if self.count > 0: |
|
330 | if self.count > 0: | |
331 | self.usages -= 1 |
|
331 | self.usages -= 1 | |
332 | # if the transaction scopes are left without being closed, fail |
|
332 | # if the transaction scopes are left without being closed, fail | |
333 | if self.count > 0 and self.usages == 0: |
|
333 | if self.count > 0 and self.usages == 0: | |
334 | self._abort() |
|
334 | self._abort() | |
335 |
|
335 | |||
336 | def running(self): |
|
336 | def running(self): | |
337 | return self.count > 0 |
|
337 | return self.count > 0 | |
338 |
|
338 | |||
339 | def addpending(self, category, callback): |
|
339 | def addpending(self, category, callback): | |
340 | """add a callback to be called when the transaction is pending |
|
340 | """add a callback to be called when the transaction is pending | |
341 |
|
341 | |||
342 | The transaction will be given as callback's first argument. |
|
342 | The transaction will be given as callback's first argument. | |
343 |
|
343 | |||
344 | Category is a unique identifier to allow overwriting an old callback |
|
344 | Category is a unique identifier to allow overwriting an old callback | |
345 | with a newer callback. |
|
345 | with a newer callback. | |
346 | """ |
|
346 | """ | |
347 | self._pendingcallback[category] = callback |
|
347 | self._pendingcallback[category] = callback | |
348 |
|
348 | |||
349 | @active |
|
349 | @active | |
350 | def writepending(self): |
|
350 | def writepending(self): | |
351 | '''write pending file to temporary version |
|
351 | '''write pending file to temporary version | |
352 |
|
352 | |||
353 | This is used to allow hooks to view a transaction before commit''' |
|
353 | This is used to allow hooks to view a transaction before commit''' | |
354 | categories = sorted(self._pendingcallback) |
|
354 | categories = sorted(self._pendingcallback) | |
355 | for cat in categories: |
|
355 | for cat in categories: | |
356 | # remove callback since the data will have been flushed |
|
356 | # remove callback since the data will have been flushed | |
357 | any = self._pendingcallback.pop(cat)(self) |
|
357 | any = self._pendingcallback.pop(cat)(self) | |
358 | self._anypending = self._anypending or any |
|
358 | self._anypending = self._anypending or any | |
359 | self._anypending |= self._generatefiles(suffix='.pending') |
|
359 | self._anypending |= self._generatefiles(suffix='.pending') | |
360 | return self._anypending |
|
360 | return self._anypending | |
361 |
|
361 | |||
362 | @active |
|
362 | @active | |
363 | def addfinalize(self, category, callback): |
|
363 | def addfinalize(self, category, callback): | |
364 | """add a callback to be called when the transaction is closed |
|
364 | """add a callback to be called when the transaction is closed | |
365 |
|
365 | |||
366 | The transaction will be given as callback's first argument. |
|
366 | The transaction will be given as callback's first argument. | |
367 |
|
367 | |||
368 | Category is a unique identifier to allow overwriting old callbacks with |
|
368 | Category is a unique identifier to allow overwriting old callbacks with | |
369 | newer callbacks. |
|
369 | newer callbacks. | |
370 | """ |
|
370 | """ | |
371 | self._finalizecallback[category] = callback |
|
371 | self._finalizecallback[category] = callback | |
372 |
|
372 | |||
373 | @active |
|
373 | @active | |
374 | def addpostclose(self, category, callback): |
|
374 | def addpostclose(self, category, callback): | |
375 | """add a callback to be called after the transaction is closed |
|
375 | """add a callback to be called after the transaction is closed | |
376 |
|
376 | |||
377 | The transaction will be given as callback's first argument. |
|
377 | The transaction will be given as callback's first argument. | |
378 |
|
378 | |||
379 | Category is a unique identifier to allow overwriting an old callback |
|
379 | Category is a unique identifier to allow overwriting an old callback | |
380 | with a newer callback. |
|
380 | with a newer callback. | |
381 | """ |
|
381 | """ | |
382 | self._postclosecallback[category] = callback |
|
382 | self._postclosecallback[category] = callback | |
383 |
|
383 | |||
384 | @active |
|
384 | @active | |
385 | def addabort(self, category, callback): |
|
385 | def addabort(self, category, callback): | |
386 | """add a callback to be called when the transaction is aborted. |
|
386 | """add a callback to be called when the transaction is aborted. | |
387 |
|
387 | |||
388 | The transaction will be given as the first argument to the callback. |
|
388 | The transaction will be given as the first argument to the callback. | |
389 |
|
389 | |||
390 | Category is a unique identifier to allow overwriting an old callback |
|
390 | Category is a unique identifier to allow overwriting an old callback | |
391 | with a newer callback. |
|
391 | with a newer callback. | |
392 | """ |
|
392 | """ | |
393 | self._abortcallback[category] = callback |
|
393 | self._abortcallback[category] = callback | |
394 |
|
394 | |||
395 | @active |
|
395 | @active | |
396 | def close(self): |
|
396 | def close(self): | |
397 | '''commit the transaction''' |
|
397 | '''commit the transaction''' | |
398 | if self.count == 1: |
|
398 | if self.count == 1: | |
399 | self.validator(self) # will raise exception if needed |
|
399 | self.validator(self) # will raise exception if needed | |
400 | self._generatefiles() |
|
400 | self._generatefiles() | |
401 | categories = sorted(self._finalizecallback) |
|
401 | categories = sorted(self._finalizecallback) | |
402 | for cat in categories: |
|
402 | for cat in categories: | |
403 | self._finalizecallback[cat](self) |
|
403 | self._finalizecallback[cat](self) | |
404 |
|
404 | |||
405 | self.count -= 1 |
|
405 | self.count -= 1 | |
406 | if self.count != 0: |
|
406 | if self.count != 0: | |
407 | return |
|
407 | return | |
408 | self.file.close() |
|
408 | self.file.close() | |
409 | self._backupsfile.close() |
|
409 | self._backupsfile.close() | |
410 | # cleanup temporary files |
|
410 | # cleanup temporary files | |
411 | for l, f, b, c in self._backupentries: |
|
411 | for l, f, b, c in self._backupentries: | |
412 | if l not in self._vfsmap and c: |
|
412 | if l not in self._vfsmap and c: | |
413 |
self.report("couldn't remo |
|
413 | self.report("couldn't remove %s: unknown cache location %s\n" | |
414 | % (b, l)) |
|
414 | % (b, l)) | |
415 | continue |
|
415 | continue | |
416 | vfs = self._vfsmap[l] |
|
416 | vfs = self._vfsmap[l] | |
417 | if not f and b and vfs.exists(b): |
|
417 | if not f and b and vfs.exists(b): | |
418 | try: |
|
418 | try: | |
419 | vfs.unlink(b) |
|
419 | vfs.unlink(b) | |
420 | except (IOError, OSError, error.Abort) as inst: |
|
420 | except (IOError, OSError, error.Abort) as inst: | |
421 | if not c: |
|
421 | if not c: | |
422 | raise |
|
422 | raise | |
423 | # Abort may be raise by read only opener |
|
423 | # Abort may be raise by read only opener | |
424 |
self.report("couldn't remo |
|
424 | self.report("couldn't remove %s: %s\n" | |
425 | % (vfs.join(b), inst)) |
|
425 | % (vfs.join(b), inst)) | |
426 | self.entries = [] |
|
426 | self.entries = [] | |
427 | self._writeundo() |
|
427 | self._writeundo() | |
428 | if self.after: |
|
428 | if self.after: | |
429 | self.after() |
|
429 | self.after() | |
430 | if self.opener.isfile(self._backupjournal): |
|
430 | if self.opener.isfile(self._backupjournal): | |
431 | self.opener.unlink(self._backupjournal) |
|
431 | self.opener.unlink(self._backupjournal) | |
432 | if self.opener.isfile(self.journal): |
|
432 | if self.opener.isfile(self.journal): | |
433 | self.opener.unlink(self.journal) |
|
433 | self.opener.unlink(self.journal) | |
434 | if True: |
|
434 | if True: | |
435 | for l, _f, b, c in self._backupentries: |
|
435 | for l, _f, b, c in self._backupentries: | |
436 | if l not in self._vfsmap and c: |
|
436 | if l not in self._vfsmap and c: | |
437 |
self.report("couldn't remo |
|
437 | self.report("couldn't remove %s: unknown cache location" | |
438 | "%s\n" % (b, l)) |
|
438 | "%s\n" % (b, l)) | |
439 | continue |
|
439 | continue | |
440 | vfs = self._vfsmap[l] |
|
440 | vfs = self._vfsmap[l] | |
441 | if b and vfs.exists(b): |
|
441 | if b and vfs.exists(b): | |
442 | try: |
|
442 | try: | |
443 | vfs.unlink(b) |
|
443 | vfs.unlink(b) | |
444 | except (IOError, OSError, error.Abort) as inst: |
|
444 | except (IOError, OSError, error.Abort) as inst: | |
445 | if not c: |
|
445 | if not c: | |
446 | raise |
|
446 | raise | |
447 | # Abort may be raise by read only opener |
|
447 | # Abort may be raise by read only opener | |
448 |
self.report("couldn't remo |
|
448 | self.report("couldn't remove %s: %s\n" | |
449 | % (vfs.join(b), inst)) |
|
449 | % (vfs.join(b), inst)) | |
450 | self._backupentries = [] |
|
450 | self._backupentries = [] | |
451 | self.journal = None |
|
451 | self.journal = None | |
452 |
|
452 | |||
453 | self.releasefn(self, True) # notify success of closing transaction |
|
453 | self.releasefn(self, True) # notify success of closing transaction | |
454 |
|
454 | |||
455 | # run post close action |
|
455 | # run post close action | |
456 | categories = sorted(self._postclosecallback) |
|
456 | categories = sorted(self._postclosecallback) | |
457 | for cat in categories: |
|
457 | for cat in categories: | |
458 | self._postclosecallback[cat](self) |
|
458 | self._postclosecallback[cat](self) | |
459 |
|
459 | |||
460 | @active |
|
460 | @active | |
461 | def abort(self): |
|
461 | def abort(self): | |
462 | '''abort the transaction (generally called on error, or when the |
|
462 | '''abort the transaction (generally called on error, or when the | |
463 | transaction is not explicitly committed before going out of |
|
463 | transaction is not explicitly committed before going out of | |
464 | scope)''' |
|
464 | scope)''' | |
465 | self._abort() |
|
465 | self._abort() | |
466 |
|
466 | |||
467 | def _writeundo(self): |
|
467 | def _writeundo(self): | |
468 | """write transaction data for possible future undo call""" |
|
468 | """write transaction data for possible future undo call""" | |
469 | if self.undoname is None: |
|
469 | if self.undoname is None: | |
470 | return |
|
470 | return | |
471 | undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') |
|
471 | undobackupfile = self.opener.open("%s.backupfiles" % self.undoname, 'w') | |
472 | undobackupfile.write('%d\n' % version) |
|
472 | undobackupfile.write('%d\n' % version) | |
473 | for l, f, b, c in self._backupentries: |
|
473 | for l, f, b, c in self._backupentries: | |
474 | if not f: # temporary file |
|
474 | if not f: # temporary file | |
475 | continue |
|
475 | continue | |
476 | if not b: |
|
476 | if not b: | |
477 | u = '' |
|
477 | u = '' | |
478 | else: |
|
478 | else: | |
479 | if l not in self._vfsmap and c: |
|
479 | if l not in self._vfsmap and c: | |
480 |
self.report("couldn't remo |
|
480 | self.report("couldn't remove %s: unknown cache location" | |
481 | "%s\n" % (b, l)) |
|
481 | "%s\n" % (b, l)) | |
482 | continue |
|
482 | continue | |
483 | vfs = self._vfsmap[l] |
|
483 | vfs = self._vfsmap[l] | |
484 | base, name = vfs.split(b) |
|
484 | base, name = vfs.split(b) | |
485 | assert name.startswith(self.journal), name |
|
485 | assert name.startswith(self.journal), name | |
486 | uname = name.replace(self.journal, self.undoname, 1) |
|
486 | uname = name.replace(self.journal, self.undoname, 1) | |
487 | u = vfs.reljoin(base, uname) |
|
487 | u = vfs.reljoin(base, uname) | |
488 | util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) |
|
488 | util.copyfile(vfs.join(b), vfs.join(u), hardlink=True) | |
489 | undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) |
|
489 | undobackupfile.write("%s\0%s\0%s\0%d\n" % (l, f, u, c)) | |
490 | undobackupfile.close() |
|
490 | undobackupfile.close() | |
491 |
|
491 | |||
492 |
|
492 | |||
493 | def _abort(self): |
|
493 | def _abort(self): | |
494 | self.count = 0 |
|
494 | self.count = 0 | |
495 | self.usages = 0 |
|
495 | self.usages = 0 | |
496 | self.file.close() |
|
496 | self.file.close() | |
497 | self._backupsfile.close() |
|
497 | self._backupsfile.close() | |
498 |
|
498 | |||
499 | try: |
|
499 | try: | |
500 | if not self.entries and not self._backupentries: |
|
500 | if not self.entries and not self._backupentries: | |
501 | if self._backupjournal: |
|
501 | if self._backupjournal: | |
502 | self.opener.unlink(self._backupjournal) |
|
502 | self.opener.unlink(self._backupjournal) | |
503 | if self.journal: |
|
503 | if self.journal: | |
504 | self.opener.unlink(self.journal) |
|
504 | self.opener.unlink(self.journal) | |
505 | return |
|
505 | return | |
506 |
|
506 | |||
507 | self.report(_("transaction abort!\n")) |
|
507 | self.report(_("transaction abort!\n")) | |
508 |
|
508 | |||
509 | try: |
|
509 | try: | |
510 | for cat in sorted(self._abortcallback): |
|
510 | for cat in sorted(self._abortcallback): | |
511 | self._abortcallback[cat](self) |
|
511 | self._abortcallback[cat](self) | |
512 | _playback(self.journal, self.report, self.opener, self._vfsmap, |
|
512 | _playback(self.journal, self.report, self.opener, self._vfsmap, | |
513 | self.entries, self._backupentries, False) |
|
513 | self.entries, self._backupentries, False) | |
514 | self.report(_("rollback completed\n")) |
|
514 | self.report(_("rollback completed\n")) | |
515 | except BaseException: |
|
515 | except BaseException: | |
516 | self.report(_("rollback failed - please run hg recover\n")) |
|
516 | self.report(_("rollback failed - please run hg recover\n")) | |
517 | finally: |
|
517 | finally: | |
518 | self.journal = None |
|
518 | self.journal = None | |
519 | self.releasefn(self, False) # notify failure of transaction |
|
519 | self.releasefn(self, False) # notify failure of transaction | |
520 |
|
520 | |||
521 | def rollback(opener, vfsmap, file, report): |
|
521 | def rollback(opener, vfsmap, file, report): | |
522 | """Rolls back the transaction contained in the given file |
|
522 | """Rolls back the transaction contained in the given file | |
523 |
|
523 | |||
524 | Reads the entries in the specified file, and the corresponding |
|
524 | Reads the entries in the specified file, and the corresponding | |
525 | '*.backupfiles' file, to recover from an incomplete transaction. |
|
525 | '*.backupfiles' file, to recover from an incomplete transaction. | |
526 |
|
526 | |||
527 | * `file`: a file containing a list of entries, specifying where |
|
527 | * `file`: a file containing a list of entries, specifying where | |
528 | to truncate each file. The file should contain a list of |
|
528 | to truncate each file. The file should contain a list of | |
529 | file\0offset pairs, delimited by newlines. The corresponding |
|
529 | file\0offset pairs, delimited by newlines. The corresponding | |
530 | '*.backupfiles' file should contain a list of file\0backupfile |
|
530 | '*.backupfiles' file should contain a list of file\0backupfile | |
531 | pairs, delimited by \0. |
|
531 | pairs, delimited by \0. | |
532 | """ |
|
532 | """ | |
533 | entries = [] |
|
533 | entries = [] | |
534 | backupentries = [] |
|
534 | backupentries = [] | |
535 |
|
535 | |||
536 | fp = opener.open(file) |
|
536 | fp = opener.open(file) | |
537 | lines = fp.readlines() |
|
537 | lines = fp.readlines() | |
538 | fp.close() |
|
538 | fp.close() | |
539 | for l in lines: |
|
539 | for l in lines: | |
540 | try: |
|
540 | try: | |
541 | f, o = l.split('\0') |
|
541 | f, o = l.split('\0') | |
542 | entries.append((f, int(o), None)) |
|
542 | entries.append((f, int(o), None)) | |
543 | except ValueError: |
|
543 | except ValueError: | |
544 | report(_("couldn't read journal entry %r!\n") % l) |
|
544 | report(_("couldn't read journal entry %r!\n") % l) | |
545 |
|
545 | |||
546 | backupjournal = "%s.backupfiles" % file |
|
546 | backupjournal = "%s.backupfiles" % file | |
547 | if opener.exists(backupjournal): |
|
547 | if opener.exists(backupjournal): | |
548 | fp = opener.open(backupjournal) |
|
548 | fp = opener.open(backupjournal) | |
549 | lines = fp.readlines() |
|
549 | lines = fp.readlines() | |
550 | if lines: |
|
550 | if lines: | |
551 | ver = lines[0][:-1] |
|
551 | ver = lines[0][:-1] | |
552 | if ver == str(version): |
|
552 | if ver == str(version): | |
553 | for line in lines[1:]: |
|
553 | for line in lines[1:]: | |
554 | if line: |
|
554 | if line: | |
555 | # Shave off the trailing newline |
|
555 | # Shave off the trailing newline | |
556 | line = line[:-1] |
|
556 | line = line[:-1] | |
557 | l, f, b, c = line.split('\0') |
|
557 | l, f, b, c = line.split('\0') | |
558 | backupentries.append((l, f, b, bool(c))) |
|
558 | backupentries.append((l, f, b, bool(c))) | |
559 | else: |
|
559 | else: | |
560 | report(_("journal was created by a different version of " |
|
560 | report(_("journal was created by a different version of " | |
561 | "Mercurial\n")) |
|
561 | "Mercurial\n")) | |
562 |
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562 | |||
563 | _playback(file, report, opener, vfsmap, entries, backupentries) |
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563 | _playback(file, report, opener, vfsmap, entries, backupentries) |
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