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Commit | Line | Data |
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6f6826c5 JS |
1 | #!/bin/sh |
2 | # | |
3 | # Rewrite revision history | |
4 | # Copyright (c) Petr Baudis, 2006 | |
5 | # Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007 | |
6 | # | |
c401b33c JS |
7 | # Lets you rewrite the revision history of the current branch, creating |
8 | # a new branch. You can specify a number of filters to modify the commits, | |
9 | # files and trees. | |
6f6826c5 | 10 | |
16ed34ad JS |
11 | # The following functions will also be available in the commit filter: |
12 | ||
13 | functions=$(cat << \EOF | |
b5669a05 SP |
14 | warn () { |
15 | echo "$*" >&2 | |
16 | } | |
17 | ||
6f6826c5 JS |
18 | map() |
19 | { | |
3520e1e8 | 20 | # if it was not rewritten, take the original |
c57a3494 JS |
21 | if test -r "$workdir/../map/$1" |
22 | then | |
23 | cat "$workdir/../map/$1" | |
24 | else | |
25 | echo "$1" | |
26 | fi | |
6f6826c5 JS |
27 | } |
28 | ||
f95eef15 JS |
29 | # if you run 'skip_commit "$@"' in a commit filter, it will print |
30 | # the (mapped) parents, effectively skipping the commit. | |
31 | ||
32 | skip_commit() | |
33 | { | |
34 | shift; | |
35 | while [ -n "$1" ]; | |
36 | do | |
37 | shift; | |
38 | map "$1"; | |
39 | shift; | |
40 | done; | |
41 | } | |
42 | ||
d3240d93 PH |
43 | # if you run 'git_commit_non_empty_tree "$@"' in a commit filter, |
44 | # it will skip commits that leave the tree untouched, commit the other. | |
45 | git_commit_non_empty_tree() | |
46 | { | |
47 | if test $# = 3 && test "$1" = $(git rev-parse "$3^{tree}"); then | |
48 | map "$3" | |
49 | else | |
50 | git commit-tree "$@" | |
51 | fi | |
52 | } | |
8c1ce0f4 JS |
53 | # override die(): this version puts in an extra line break, so that |
54 | # the progress is still visible | |
55 | ||
56 | die() | |
57 | { | |
58 | echo >&2 | |
59 | echo "$*" >&2 | |
60 | exit 1 | |
61 | } | |
16ed34ad JS |
62 | EOF |
63 | ) | |
64 | ||
65 | eval "$functions" | |
8c1ce0f4 | 66 | |
6f6826c5 JS |
67 | # When piped a commit, output a script to set the ident of either |
68 | # "author" or "committer | |
69 | ||
70 | set_ident () { | |
40a7ce64 JK |
71 | lid="$(echo "$1" | tr "[A-Z]" "[a-z]")" |
72 | uid="$(echo "$1" | tr "[a-z]" "[A-Z]")" | |
6f6826c5 JS |
73 | pick_id_script=' |
74 | /^'$lid' /{ | |
75 | s/'\''/'\''\\'\'\''/g | |
76 | h | |
77 | s/^'$lid' \([^<]*\) <[^>]*> .*$/\1/ | |
78 | s/'\''/'\''\'\'\''/g | |
3addc94a | 79 | s/.*/GIT_'$uid'_NAME='\''&'\''; export GIT_'$uid'_NAME/p |
6f6826c5 JS |
80 | |
81 | g | |
82 | s/^'$lid' [^<]* <\([^>]*\)> .*$/\1/ | |
83 | s/'\''/'\''\'\'\''/g | |
3addc94a | 84 | s/.*/GIT_'$uid'_EMAIL='\''&'\''; export GIT_'$uid'_EMAIL/p |
6f6826c5 JS |
85 | |
86 | g | |
87 | s/^'$lid' [^<]* <[^>]*> \(.*\)$/\1/ | |
88 | s/'\''/'\''\'\'\''/g | |
3addc94a | 89 | s/.*/GIT_'$uid'_DATE='\''&'\''; export GIT_'$uid'_DATE/p |
6f6826c5 JS |
90 | |
91 | q | |
92 | } | |
93 | ' | |
94 | ||
95 | LANG=C LC_ALL=C sed -ne "$pick_id_script" | |
96 | # Ensure non-empty id name. | |
3addc94a | 97 | echo "case \"\$GIT_${uid}_NAME\" in \"\") GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*}\" && export GIT_${uid}_NAME;; esac" |
6f6826c5 JS |
98 | } |
99 | ||
83e355a6 MM |
100 | USAGE="[--env-filter <command>] [--tree-filter <command>] |
101 | [--index-filter <command>] [--parent-filter <command>] | |
102 | [--msg-filter <command>] [--commit-filter <command>] | |
103 | [--tag-name-filter <command>] [--subdirectory-filter <directory>] | |
104 | [--original <namespace>] [-d <directory>] [-f | --force] | |
105 | [<rev-list options>...]" | |
7e0f1704 | 106 | |
8f321a39 | 107 | OPTIONS_SPEC= |
7e0f1704 JS |
108 | . git-sh-setup |
109 | ||
a4661b01 | 110 | if [ "$(is_bare_repository)" = false ]; then |
26be15f0 | 111 | git diff-files --ignore-submodules --quiet && |
38762c47 | 112 | git diff-index --cached --quiet HEAD -- || |
46eb449c | 113 | die "Cannot rewrite branch(es) with a dirty working directory." |
a4661b01 | 114 | fi |
46eb449c | 115 | |
6f6826c5 | 116 | tempdir=.git-rewrite |
6f6826c5 JS |
117 | filter_env= |
118 | filter_tree= | |
119 | filter_index= | |
120 | filter_parent= | |
121 | filter_msg=cat | |
d3240d93 | 122 | filter_commit= |
6f6826c5 | 123 | filter_tag_name= |
685ef546 | 124 | filter_subdir= |
dfd05e38 JS |
125 | orig_namespace=refs/original/ |
126 | force= | |
d3240d93 | 127 | prune_empty= |
f2f3a6b8 | 128 | remap_to_ancestor= |
822f7c73 | 129 | while : |
6f6826c5 JS |
130 | do |
131 | case "$1" in | |
132 | --) | |
133 | shift | |
134 | break | |
135 | ;; | |
dfd05e38 JS |
136 | --force|-f) |
137 | shift | |
138 | force=t | |
139 | continue | |
140 | ;; | |
f2f3a6b8 TR |
141 | --remap-to-ancestor) |
142 | shift | |
143 | remap_to_ancestor=t | |
144 | continue | |
145 | ;; | |
d3240d93 PH |
146 | --prune-empty) |
147 | shift | |
148 | prune_empty=t | |
149 | continue | |
150 | ;; | |
6f6826c5 JS |
151 | -*) |
152 | ;; | |
153 | *) | |
154 | break; | |
155 | esac | |
156 | ||
157 | # all switches take one argument | |
158 | ARG="$1" | |
159 | case "$#" in 1) usage ;; esac | |
160 | shift | |
161 | OPTARG="$1" | |
162 | shift | |
163 | ||
164 | case "$ARG" in | |
165 | -d) | |
166 | tempdir="$OPTARG" | |
167 | ;; | |
6f6826c5 JS |
168 | --env-filter) |
169 | filter_env="$OPTARG" | |
170 | ;; | |
171 | --tree-filter) | |
172 | filter_tree="$OPTARG" | |
173 | ;; | |
174 | --index-filter) | |
175 | filter_index="$OPTARG" | |
176 | ;; | |
177 | --parent-filter) | |
178 | filter_parent="$OPTARG" | |
179 | ;; | |
180 | --msg-filter) | |
181 | filter_msg="$OPTARG" | |
182 | ;; | |
183 | --commit-filter) | |
16ed34ad | 184 | filter_commit="$functions; $OPTARG" |
6f6826c5 JS |
185 | ;; |
186 | --tag-name-filter) | |
187 | filter_tag_name="$OPTARG" | |
188 | ;; | |
685ef546 JS |
189 | --subdirectory-filter) |
190 | filter_subdir="$OPTARG" | |
f2f3a6b8 | 191 | remap_to_ancestor=t |
685ef546 | 192 | ;; |
dfd05e38 | 193 | --original) |
55ced83d | 194 | orig_namespace=$(expr "$OPTARG/" : '\(.*[^/]\)/*$')/ |
dfd05e38 | 195 | ;; |
6f6826c5 JS |
196 | *) |
197 | usage | |
198 | ;; | |
199 | esac | |
200 | done | |
201 | ||
d3240d93 PH |
202 | case "$prune_empty,$filter_commit" in |
203 | ,) | |
204 | filter_commit='git commit-tree "$@"';; | |
205 | t,) | |
206 | filter_commit="$functions;"' git_commit_non_empty_tree "$@"';; | |
207 | ,*) | |
208 | ;; | |
209 | *) | |
210 | die "Cannot set --prune-empty and --filter-commit at the same time" | |
211 | esac | |
212 | ||
dfd05e38 JS |
213 | case "$force" in |
214 | t) | |
215 | rm -rf "$tempdir" | |
216 | ;; | |
217 | '') | |
218 | test -d "$tempdir" && | |
219 | die "$tempdir already exists, please remove it" | |
220 | esac | |
af580e9c | 221 | mkdir -p "$tempdir/t" && |
dfd05e38 | 222 | tempdir="$(cd "$tempdir"; pwd)" && |
af580e9c JS |
223 | cd "$tempdir/t" && |
224 | workdir="$(pwd)" || | |
225 | die "" | |
6f6826c5 | 226 | |
def16e71 BC |
227 | # Remove tempdir on exit |
228 | trap 'cd ../..; rm -rf "$tempdir"' 0 | |
229 | ||
88e38808 LN |
230 | ORIG_GIT_DIR="$GIT_DIR" |
231 | ORIG_GIT_WORK_TREE="$GIT_WORK_TREE" | |
232 | ORIG_GIT_INDEX_FILE="$GIT_INDEX_FILE" | |
233 | GIT_WORK_TREE=. | |
234 | export GIT_DIR GIT_WORK_TREE | |
235 | ||
dfd05e38 | 236 | # Make sure refs/original is empty |
0ea29cce | 237 | git for-each-ref > "$tempdir"/backup-refs || exit |
dfd05e38 JS |
238 | while read sha1 type name |
239 | do | |
240 | case "$force,$name" in | |
241 | ,$orig_namespace*) | |
734cd572 JT |
242 | die "Cannot create a new backup. |
243 | A previous backup already exists in $orig_namespace | |
244 | Force overwriting the backup with -f" | |
dfd05e38 JS |
245 | ;; |
246 | t,$orig_namespace*) | |
247 | git update-ref -d "$name" $sha1 | |
248 | ;; | |
249 | esac | |
250 | done < "$tempdir"/backup-refs | |
251 | ||
418fa3a5 | 252 | # The refs should be updated if their heads were rewritten |
0ea29cce EK |
253 | git rev-parse --no-flags --revs-only --symbolic-full-name \ |
254 | --default HEAD "$@" > "$tempdir"/raw-heads || exit | |
255 | sed -e '/^^/d' "$tempdir"/raw-heads >"$tempdir"/heads | |
dfd05e38 JS |
256 | |
257 | test -s "$tempdir"/heads || | |
258 | die "Which ref do you want to rewrite?" | |
259 | ||
3addc94a JS |
260 | GIT_INDEX_FILE="$(pwd)/../index" |
261 | export GIT_INDEX_FILE | |
6f6826c5 | 262 | |
af580e9c JS |
263 | # map old->new commit ids for rewriting parents |
264 | mkdir ../map || die "Could not create map/ directory" | |
6f6826c5 | 265 | |
2c1d2d81 TR |
266 | # we need "--" only if there are no path arguments in $@ |
267 | nonrevs=$(git rev-parse --no-revs "$@") || exit | |
268 | test -z "$nonrevs" && dashdash=-- || dashdash= | |
269 | rev_args=$(git rev-parse --revs-only "$@") | |
270 | ||
685ef546 JS |
271 | case "$filter_subdir" in |
272 | "") | |
2c1d2d81 | 273 | eval set -- "$(git rev-parse --sq --no-revs "$@")" |
685ef546 JS |
274 | ;; |
275 | *) | |
2c1d2d81 TR |
276 | eval set -- "$(git rev-parse --sq --no-revs "$@" $dashdash \ |
277 | "$filter_subdir")" | |
278 | ;; | |
279 | esac | |
280 | ||
281 | git rev-list --reverse --topo-order --default HEAD \ | |
282 | --parents --simplify-merges $rev_args "$@" > ../revs || | |
283 | die "Could not get the commits" | |
9d6f220c | 284 | commits=$(wc -l <../revs | tr -d " ") |
6f6826c5 JS |
285 | |
286 | test $commits -eq 0 && die "Found nothing to rewrite" | |
287 | ||
dfd05e38 JS |
288 | # Rewrite the commits |
289 | ||
d5b0c97d | 290 | git_filter_branch__commit_count=0 |
813b4734 | 291 | while read commit parents; do |
d5b0c97d EN |
292 | git_filter_branch__commit_count=$(($git_filter_branch__commit_count+1)) |
293 | printf "\rRewrite $commit ($git_filter_branch__commit_count/$commits)" | |
6f6826c5 | 294 | |
685ef546 JS |
295 | case "$filter_subdir" in |
296 | "") | |
5be60078 | 297 | git read-tree -i -m $commit |
685ef546 JS |
298 | ;; |
299 | *) | |
5b044ac3 JH |
300 | # The commit may not have the subdirectory at all |
301 | err=$(git read-tree -i -m $commit:"$filter_subdir" 2>&1) || { | |
d69da76d | 302 | if ! git rev-parse -q --verify $commit:"$filter_subdir" |
5b044ac3 JH |
303 | then |
304 | rm -f "$GIT_INDEX_FILE" | |
305 | else | |
306 | echo >&2 "$err" | |
307 | false | |
308 | fi | |
309 | } | |
af580e9c | 310 | esac || die "Could not initialize the index" |
6f6826c5 | 311 | |
3addc94a JS |
312 | GIT_COMMIT=$commit |
313 | export GIT_COMMIT | |
af580e9c JS |
314 | git cat-file commit "$commit" >../commit || |
315 | die "Cannot read commit $commit" | |
6f6826c5 | 316 | |
8c1ce0f4 JS |
317 | eval "$(set_ident AUTHOR <../commit)" || |
318 | die "setting author failed for commit $commit" | |
319 | eval "$(set_ident COMMITTER <../commit)" || | |
320 | die "setting committer failed for commit $commit" | |
321 | eval "$filter_env" < /dev/null || | |
322 | die "env filter failed: $filter_env" | |
6f6826c5 JS |
323 | |
324 | if [ "$filter_tree" ]; then | |
af580e9c JS |
325 | git checkout-index -f -u -a || |
326 | die "Could not checkout the index" | |
6f6826c5 JS |
327 | # files that $commit removed are now still in the working tree; |
328 | # remove them, else they would be added again | |
6a589fda | 329 | git clean -d -q -f -x |
8c1ce0f4 JS |
330 | eval "$filter_tree" < /dev/null || |
331 | die "tree filter failed: $filter_tree" | |
332 | ||
1fe32cb9 | 333 | ( |
0ea29cce | 334 | git diff-index -r --name-only $commit && |
1fe32cb9 | 335 | git ls-files --others |
0ea29cce EK |
336 | ) > "$tempdir"/tree-state || exit |
337 | git update-index --add --replace --remove --stdin \ | |
338 | < "$tempdir"/tree-state || exit | |
6f6826c5 JS |
339 | fi |
340 | ||
8c1ce0f4 JS |
341 | eval "$filter_index" < /dev/null || |
342 | die "index filter failed: $filter_index" | |
6f6826c5 JS |
343 | |
344 | parentstr= | |
813b4734 | 345 | for parent in $parents; do |
3520e1e8 JS |
346 | for reparent in $(map "$parent"); do |
347 | parentstr="$parentstr -p $reparent" | |
348 | done | |
6f6826c5 JS |
349 | done |
350 | if [ "$filter_parent" ]; then | |
8c1ce0f4 JS |
351 | parentstr="$(echo "$parentstr" | eval "$filter_parent")" || |
352 | die "parent filter failed: $filter_parent" | |
6f6826c5 JS |
353 | fi |
354 | ||
355 | sed -e '1,/^$/d' <../commit | \ | |
8c1ce0f4 JS |
356 | eval "$filter_msg" > ../message || |
357 | die "msg filter failed: $filter_msg" | |
4bf9f27d | 358 | @SHELL_PATH@ -c "$filter_commit" "git commit-tree" \ |
0ea29cce EK |
359 | $(git write-tree) $parentstr < ../message > ../map/$commit || |
360 | die "could not write rewritten commit" | |
6f6826c5 JS |
361 | done <../revs |
362 | ||
f2f3a6b8 TR |
363 | # If we are filtering for paths, as in the case of a subdirectory |
364 | # filter, it is possible that a specified head is not in the set of | |
365 | # rewritten commits, because it was pruned by the revision walker. | |
366 | # Ancestor remapping fixes this by mapping these heads to the unique | |
367 | # nearest ancestor that survived the pruning. | |
dfd05e38 | 368 | |
f2f3a6b8 | 369 | if test "$remap_to_ancestor" = t |
a0e46390 TR |
370 | then |
371 | while read ref | |
dfd05e38 | 372 | do |
a0e46390 TR |
373 | sha1=$(git rev-parse "$ref"^0) |
374 | test -f "$workdir"/../map/$sha1 && continue | |
2c1d2d81 | 375 | ancestor=$(git rev-list --simplify-merges -1 "$ref" "$@") |
a0e46390 TR |
376 | test "$ancestor" && echo $(map $ancestor) >> "$workdir"/../map/$sha1 |
377 | done < "$tempdir"/heads | |
378 | fi | |
dfd05e38 JS |
379 | |
380 | # Finally update the refs | |
381 | ||
382 | _x40='[0-9a-f][0-9a-f][0-9a-f][0-9a-f][0-9a-f]' | |
383 | _x40="$_x40$_x40$_x40$_x40$_x40$_x40$_x40$_x40" | |
dfd05e38 JS |
384 | echo |
385 | while read ref | |
386 | do | |
387 | # avoid rewriting a ref twice | |
388 | test -f "$orig_namespace$ref" && continue | |
389 | ||
390 | sha1=$(git rev-parse "$ref"^0) | |
391 | rewritten=$(map $sha1) | |
392 | ||
393 | test $sha1 = "$rewritten" && | |
394 | warn "WARNING: Ref '$ref' is unchanged" && | |
395 | continue | |
396 | ||
397 | case "$rewritten" in | |
398 | '') | |
399 | echo "Ref '$ref' was deleted" | |
400 | git update-ref -m "filter-branch: delete" -d "$ref" $sha1 || | |
401 | die "Could not delete $ref" | |
98409060 | 402 | ;; |
dfd05e38 JS |
403 | $_x40) |
404 | echo "Ref '$ref' was rewritten" | |
261044e8 TR |
405 | if ! git update-ref -m "filter-branch: rewrite" \ |
406 | "$ref" $rewritten $sha1 2>/dev/null; then | |
407 | if test $(git cat-file -t "$ref") = tag; then | |
408 | if test -z "$filter_tag_name"; then | |
409 | warn "WARNING: You said to rewrite tagged commits, but not the corresponding tag." | |
410 | warn "WARNING: Perhaps use '--tag-name-filter cat' to rewrite the tag." | |
411 | fi | |
412 | else | |
413 | die "Could not rewrite $ref" | |
414 | fi | |
415 | fi | |
98409060 | 416 | ;; |
dfd05e38 JS |
417 | *) |
418 | # NEEDSWORK: possibly add -Werror, making this an error | |
419 | warn "WARNING: '$ref' was rewritten into multiple commits:" | |
420 | warn "$rewritten" | |
421 | warn "WARNING: Ref '$ref' points to the first one now." | |
422 | rewritten=$(echo "$rewritten" | head -n 1) | |
423 | git update-ref -m "filter-branch: rewrite to first" \ | |
424 | "$ref" $rewritten $sha1 || | |
425 | die "Could not rewrite $ref" | |
426 | ;; | |
427 | esac | |
0ea29cce EK |
428 | git update-ref -m "filter-branch: backup" "$orig_namespace$ref" $sha1 || |
429 | exit | |
dfd05e38 JS |
430 | done < "$tempdir"/heads |
431 | ||
432 | # TODO: This should possibly go, with the semantics that all positive given | |
433 | # refs are updated, and their original heads stored in refs/original/ | |
434 | # Filter tags | |
6f6826c5 JS |
435 | |
436 | if [ "$filter_tag_name" ]; then | |
5be60078 | 437 | git for-each-ref --format='%(objectname) %(objecttype) %(refname)' refs/tags | |
6f6826c5 JS |
438 | while read sha1 type ref; do |
439 | ref="${ref#refs/tags/}" | |
440 | # XXX: Rewrite tagged trees as well? | |
441 | if [ "$type" != "commit" -a "$type" != "tag" ]; then | |
442 | continue; | |
443 | fi | |
444 | ||
445 | if [ "$type" = "tag" ]; then | |
446 | # Dereference to a commit | |
447 | sha1t="$sha1" | |
7bd93c1c | 448 | sha1="$(git rev-parse -q "$sha1"^{commit})" || continue |
6f6826c5 JS |
449 | fi |
450 | ||
451 | [ -f "../map/$sha1" ] || continue | |
452 | new_sha1="$(cat "../map/$sha1")" | |
3addc94a JS |
453 | GIT_COMMIT="$sha1" |
454 | export GIT_COMMIT | |
8c1ce0f4 JS |
455 | new_ref="$(echo "$ref" | eval "$filter_tag_name")" || |
456 | die "tag name filter failed: $filter_tag_name" | |
6f6826c5 JS |
457 | |
458 | echo "$ref -> $new_ref ($sha1 -> $new_sha1)" | |
459 | ||
460 | if [ "$type" = "tag" ]; then | |
a9da1663 JS |
461 | new_sha1=$( ( printf 'object %s\ntype commit\ntag %s\n' \ |
462 | "$new_sha1" "$new_ref" | |
463 | git cat-file tag "$ref" | | |
1bf6551e BC |
464 | sed -n \ |
465 | -e "1,/^$/{ | |
a9da1663 JS |
466 | /^object /d |
467 | /^type /d | |
468 | /^tag /d | |
1bf6551e BC |
469 | }" \ |
470 | -e '/^-----BEGIN PGP SIGNATURE-----/q' \ | |
a9da1663 | 471 | -e 'p' ) | |
1bf6551e BC |
472 | git mktag) || |
473 | die "Could not create new tag object for $ref" | |
474 | if git cat-file tag "$ref" | \ | |
e1622bfc | 475 | sane_grep '^-----BEGIN PGP SIGNATURE-----' >/dev/null 2>&1 |
1bf6551e BC |
476 | then |
477 | warn "gpg signature stripped from tag object $sha1t" | |
478 | fi | |
6f6826c5 JS |
479 | fi |
480 | ||
af580e9c JS |
481 | git update-ref "refs/tags/$new_ref" "$new_sha1" || |
482 | die "Could not write tag $new_ref" | |
6f6826c5 JS |
483 | done |
484 | fi | |
485 | ||
486 | cd ../.. | |
487 | rm -rf "$tempdir" | |
6f6826c5 | 488 | |
def16e71 BC |
489 | trap - 0 |
490 | ||
9273b562 EK |
491 | unset GIT_DIR GIT_WORK_TREE GIT_INDEX_FILE |
492 | test -z "$ORIG_GIT_DIR" || { | |
493 | GIT_DIR="$ORIG_GIT_DIR" && export GIT_DIR | |
494 | } | |
495 | test -z "$ORIG_GIT_WORK_TREE" || { | |
496 | GIT_WORK_TREE="$ORIG_GIT_WORK_TREE" && | |
497 | export GIT_WORK_TREE | |
498 | } | |
499 | test -z "$ORIG_GIT_INDEX_FILE" || { | |
500 | GIT_INDEX_FILE="$ORIG_GIT_INDEX_FILE" && | |
501 | export GIT_INDEX_FILE | |
502 | } | |
503 | ||
a4661b01 | 504 | if [ "$(is_bare_repository)" = false ]; then |
0ea29cce | 505 | git read-tree -u -m HEAD || exit |
a4661b01 | 506 | fi |
46eb449c | 507 | |
0ea29cce | 508 | exit 0 |