1SVN-BISECT(1) User Contributed Perl Documentation SVN-BISECT(1)
2
6 svn-bisect
7
9 $ svn-bisect --min 25000 --max 26000 start
10 $ svn-bisect bad
11 $ svn-bisect bad
12 $ svn-bisect good
13 [etc etc]
14 $ svn-bisect reset
15
17 This tool's purpose is to help you determine which revision of a
18 subversion repository contains a change. It does this by employing a
19 binary search. It will manage the current revision of your checkout
20 directory, and narrow in on the target revision, as you give it clues
21 about the current revision such as "before" (this revision is before
22 the one you want) or "after" (this revision is after the one you want).
23 Start a bisect session with the "start" command. Then, walk the binary
25 tree by using the "before" and "after" commands. When you are done,
26 the tool will tell you the target revision.
27 The most common usage scenario is finding out which rev a bug was
29 introduced in. For this purpose, some command aliases have been added:
30 if the current revision contains the bug, you can use the "bad" command
31 (meaning, this revision is "after" the change you want to find),
32 otherwise use the "good" command (meaning, this revision is "before"
33 the change you want to find).
34 All commands should be run from within a subversion checkout directory.
36 After a "svn-bisect start", all subsequent svn-bisect commands need to
37 be run from that same directory.
38
40 Options MUST be specified before subcommands, on the command line.
41 Options specified after the subcommand will be passed to the
42 subcommand; this is currently only useful for the "run" subcommand.
43 --help
45 Use anywhere. Output a command list, or specific help for the
46 given command.
47 --version
49 Use anywhere. Tells you my version number.
50 --verbose
52 Use anywhere. Enable some additional informational output.
53 --min
55 Use with "start". Specify the beginning revision of the range.
56 --max
58 Use with "start". Specify the ending revision of the range.
59 --back
61 Use with "reset". Restores the original repository version.
62
64 start
65 svn-bisect [--min M] [--max N] start
66 Start a new bisect session. If --min isn't specified, you can specify
68 it later with the "good" command. If --max isn't specified, you can
69 specify it later with the "bad" command.
70 after
72 svn-bisect after [revision]
73 or: svn-bisect bad [revision]
74 Inform svn-bisect that the specified revision is *after* the change
76 we're looking for. If you don't specify a revision number, the current
77 revision of the working tree is used. If you are looking for the rev
78 which introduced a bug (which is the common case), the alias "bad"
79 might be easier to remember.
80 before
82 svn-bisect before [revision]
83 or: svn-bisect good [revision]
84 Inform svn-bisect that the specified revision is *before* the change
86 we're looking for. If you don't specify a revision number, the current
87 revision of the working tree is used. If you are looking for the rev
88 which introduced a bug (which is the common case), the alias "good"
89 might be easier to remember.
90 skip
92 svn-bisect skip [<rev> [<rev>...]]
93 Tell svn-bisect to skip the specified revision. If no revision is
95 specified, the current version of the working tree is used. Do this if
96 you can't determine whether the current revision is bad or good, if,
97 for instance, some other issue prevents it from compiling successfully.
98 You may specify more than one revision, and they will all be skipped.
100 unskip
102 svn-bisect unskip <rev> [<rev>...]
103 Tell svn-bisect to no longer skip the specified revision. You must
105 specify at least one revision to unskip. If you specify more than one,
106 they will all be unskipped.
107 run
109 svn-bisect run <command> [arguments...]
110 Runs a command repeatedly to automate the bisection process.
112 Examples:
114 svn-bisect run ./mytest.sh
116 svn-bisect run test ! -f file
117 We run the command and arguments until a conclusion is reached. The
119 command (usually a shell script) tells us about the current revision by
120 way of its return code. The following return codes are handled:
121 0: This revision is before the change we're looking for
123 1-124, 126-127: This revision includes the change we're looking for
124 125: This revision is untestable and should be skipped
125 any other value: The command failed to run, abort bisection.
126 In other words, "run" will automatically find the last revision for
128 which the given command returns success. (Keep in mind that in the
129 shell, "0" means "success".)
130 The normal caveats apply. In particular, if your script makes any
132 changes, don't forget to clean up afterwards.
133 reset
135 svn-bisect reset
136 Clean up after a bisect, and return the repository to the revision it
138 was at before you started.
139 help
141 svn-bisect help
142 svn-bisect help start
143 Gives you some useful descriptions and usage information.
145
147 ...Because, you know, no software documentation is complete without a
148 flashy screenshot, these days.
149 So, lets say you were wondering when the subversion project added the
151 "Last Changed Rev:" line to the output of "svn info". Determining the
152 existence of this change is a straightforward matter of searching for
153 the text string... if a result was found, the current revision is
154 "after", otherwise it was "before". So a bisect looks like this:
155 $ svn co http://svn.apache.org/repos/asf/subversion/trunk/subversion
157 [snip lots of subversion checkout spam]
158 Checked out revision 980012.
159 $ cd subversion
161 $ ack --nocolor --nogroup 'Last Changed Rev'
163 svn/info-cmd.c:362: SVN_ERR(svn_cmdline_printf(pool, _("Last Changed Rev: %ld\n"),
164 tests/cmdline/depth_tests.py:2056: 'Last Changed Rev' : '^1$',
165 tests/cmdline/upgrade_tests.py:387: 'Last Changed Rev' : '7'
166 tests/cmdline/upgrade_tests.py:396: 'Last Changed Rev' : '10'
167 $ date
169 Wed Jul 28 06:40:03 EDT 2010
170 $ svn-bisect --min 0 start
172 $ svn-bisect after
173 Fetching history from r0 to r980012; it may take a while.
174 There are 24349 revs left in the pool. Choosing r862045.
175 $ ack --nocolor --nogroup 'Last Changed Rev'
177 svn/info-cmd.c:348: SVN_ERR(svn_cmdline_printf(pool, _("Last Changed Rev: %ld\n"),
178 $ svn-bisect after
180 There are 12174 revs left in the pool. Choosing r845633.
181 $ ack --nocolor --nogroup 'Last Changed Rev'
183 clients/cmdline/info-cmd.c:153: printf ("Last Changed Rev: %" SVN_REVNUM_T_FMT "\n", entry->cmt_rev);
184 $ svn-bisect after
186 There are 6087 revs left in the pool. Choosing r840416.
187 $ ack --nocolor --nogroup 'Last Changed Rev'
189 $ svn-bisect before
191 There are 3043 revs left in the pool. Choosing r842636.
192 # ack --nocolor --nogroup 'Last Changed Rev'
194 clients/cmdline/info-cmd.c:153: printf ("Last Changed Rev: %" SVN_REVNUM_T_FMT "\n", entry->cmt_rev);
195 $ svn-bisect after
197 There are 1521 revs left in the pool. Choosing r841463.
198 $ ack --nocolor --nogroup 'Last Changed Rev'
200 $ svn-bisect before
202 There are 760 revs left in the pool. Choosing r841993.
203 $ ack --nocolor --nogroup 'Last Changed Rev'
205 clients/cmdline/info-cmd.c:161: printf ("Last Changed Rev: %" SVN_REVNUM_T_FMT "\n", entry->cmt_rev);
206 $ svn-bisect after
208 There are 380 revs left in the pool. Choosing r841730.
209 $ ack --nocolor --nogroup 'Last Changed Rev'
211 $ svn-bisect before
213 There are 189 revs left in the pool. Choosing r841860.
214 $ ack --nocolor --nogroup 'Last Changed Rev'
216 $ svn-bisect before
218 There are 94 revs left in the pool. Choosing r841933.
219 $ ack --nocolor --nogroup 'Last Changed Rev'
221 clients/cmdline/info-cmd.c:151: printf ("Last Changed Rev: %" SVN_REVNUM_T_FMT "\n", entry->cmt_rev);
222 $ svn-bisect after
224 There are 47 revs left in the pool. Choosing r841904.
225 $ ack --nocolor --nogroup 'Last Changed Rev'
227 clients/cmdline/info-cmd.c:150: printf ("Last Changed Rev: %ld\n", entry->cmt_rev);
228 $ svn-bisect after
230 There are 23 revs left in the pool. Choosing r841880.
231 $ ack --nocolor --nogroup 'Last Changed Rev'
233 $ svn-bisect before
235 There are 11 revs left in the pool. Choosing r841890.
236 $ ack --nocolor --nogroup 'Last Changed Rev'
238 clients/cmdline/info-cmd.c:153: printf ("Last Changed Rev: %ld\n", entry->cmt_rev);
239 $ svn-bisect after
241 There are 5 revs left in the pool. Choosing r841883.
242 $ ack --nocolor --nogroup 'Last Changed Rev'
244 clients/cmdline/info-cmd.c:153: printf ("Last Changed Rev: %ld\n", entry->cmt_rev);
245 $ svn-bisect after
247 There are 2 revs left in the pool. Choosing r841882.
248 $ ack --nocolor --nogroup 'Last Changed Rev'
250 $ svn-bisect before
252 This is the end of the road!
253 The change occurred in r841883.
254 $ svn log -r841883
256 ------------------------------------------------------------------------
257 r841883 | rooneg | 2002-04-27 15:23:38 -0400 (Sat, 27 Apr 2002) | 30 lines
258 As requested by cmpilato in issue #676, add an 'svn info' command, which
260 prints out the contents of the svn_wc_entry_t for a given versioned resource.
261 * CHANGES
263 note the addition of the 'svn info' command.
264 * subversion/clients/cmdline/cl.h
266 add declaration for svn_cl__info.
267 * subversion/clients/cmdline/info-cmd.c
269 new file implementing the info command.
270 * subversion/clients/cmdline/main.c
272 hook up the info command.
273 * subversion/clients/cmdline/man/svn.1
275 document the info command.
276 * subversion/tests/clients/cmdline/getopt_tests_data/svn--help_stdout
278 update for the addition of info command.
279 * subversion/tests/clients/cmdline/getopt_tests_data/svn_help_stdout
281 ditto.
282 * subversion/tests/clients/cmdline/getopt_tests_data/svn_stderr
284 ditto.
285 * tools/dev/bash_completion
287 add 'info' to the tab completion.
288 ------------------------------------------------------------------------
290 $ date
292 Wed Jul 28 06:45:27 EDT 2010
293 So, there it is. In 5 minutes, we've learned that "Last Changed Rev:"
295 has been in there since the inception of the "svn info" command itself,
296 back in 2002.
297 You can also provide a script command to do all of the work for you:
299 $ svn-bisect --min 0 --max 980012 start
301 $ svn-bisect run '! grep -r "Last Changed Rev" .'
302
304 This tool requires:
305 * A computer
307 * A brain
309 * An installation of Perl, version 5.8 or above
311 * The IO::All module, installed from CPAN
313 * The YAML::Syck module, installed from CPAN
315 * The "svn" command somewhere in your PATH, executable by the current
317 user
318 * A svn checkout with some history to bisect.
320
322 Mark Glines <mark-cpan@glines.org>
323
325 Browser: <http://github.com/Infinoid/svn-bisect/> Clone:
326 <git://github.com/Infinoid/svn-bisect.git>
327
329 * Thanks to the git-bisect author(s), for coming up with a user
330 interface that
331 I actually like.
332 * Thanks to Will Coleda for inspiring me to actually write and release
334 this.
335 * Thanks to the Parrot project for having so much random stuff going on
337 as to
338 make a tool like this necessary.
339
341 App::SVNBinarySearch by Will Coleda:
342 <http://search.cpan.org/dist/App-SVNBinarySearch/>
343
345 This software is copyright (c) 2008 Mark Glines.
346 It is distributed under the terms of the Artistic License 2.0. For
348 details, see the "LICENSE" file packaged alongside this tool.
349perl v5.30.1 2020-01-29 SVN-BISECT(1)