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git.ipfire.org Git - thirdparty/git.git/blob - git-filter-branch.sh
3 # Rewrite revision history
4 # Copyright (c) Petr Baudis, 2006
5 # Minimal changes to "port" it to core-git (c) Johannes Schindelin, 2007
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,
13 USAGE
= "git-filter-branch [-d TEMPDIR] [FILTERS] DESTBRANCH [REV-RANGE]"
22 # if it was not rewritten, take the original
23 if test -r " $workdir /../map/ $1 "
25 cat " $workdir /../map/ $1 "
31 # override die(): this version puts in an extra line break, so that
32 # the progress is still visible
41 # When piped a commit, output a script to set the ident of either
42 # "author" or "committer
45 lid
= "$(echo " $1 " | tr " A-Z
" " a-z
")"
46 uid
= "$(echo " $1 " | tr " a-z
" " A-Z
")"
51 s/^' $lid ' \([^<]*\) <[^>]*> .*$/\1/
53 s
/ .
*/ export GIT_
' $uid ' _NAME
= ' \' ' & ' \' ' / p
56 s
/ ^
' $lid ' [ ^
<]* < \
([ ^
>]* \
)> .
* $
/ \
1 /
58 s/.*/export GIT_' $uid '_EMAIL=' \' '&' \' '/p
61 s/^' $lid ' [^<]* <[^>]*> \(.*\)$/\1/
63 s
/ .
*/ export GIT_
' $uid ' _DATE
= ' \' ' & ' \' ' / p
69 LANG=C LC_ALL=C sed -ne " $pick_id_script "
70 # Ensure non-empty id name.
71 echo "[ -n \" \ $GIT_ ${uid}_NAME\" ] || export GIT_${uid}_NAME=\"\${GIT_${uid}_EMAIL%%@*} \" "
80 filter_commit=' git commit-tree
"$@" '
83 while case " $# " in 0) usage;; esac
96 # all switches take one argument
98 case " $# " in 1) usage ;; esac
111 filter_tree=" $OPTARG "
114 filter_index=" $OPTARG "
117 filter_parent=" $OPTARG "
123 filter_commit=" $OPTARG "
126 filter_tag_name=" $OPTARG "
128 --subdirectory-filter)
129 filter_subdir=" $OPTARG "
139 test -n " $dstbranch " || die "missing branch name"
140 git show-ref "refs/heads/ $dstbranch " 2> /dev/null &&
141 die "branch $dstbranch already exists"
143 test ! -e " $tempdir " || die " $tempdir already exists, please remove it"
144 mkdir -p " $tempdir /t"
152 GIT_DIR="$(pwd)/../../ $GIT_DIR "
155 export GIT_DIR GIT_WORK_TREE=.
157 export GIT_INDEX_FILE="$(pwd)/../index"
158 git read-tree # seed the index file
163 mkdir ../map # map old->new commit ids for rewriting parents
165 case " $filter_subdir " in
167 git rev-list --reverse --topo-order --default HEAD \
171 git rev-list --reverse --topo-order --default HEAD \
172 --parents --full-history "$@" -- " $filter_subdir "
174 commits=$(wc -l <../revs | tr -d " ")
176 test $commits -eq 0 && die "Found nothing to rewrite"
179 while read commit parents; do
181 printf " \r Rewrite $commit ( $i / $commits )"
183 case " $filter_subdir " in
185 git read-tree -i -m $commit
188 git read-tree -i -m $commit :" $filter_subdir "
191 export GIT_COMMIT= $commit
192 git cat-file commit " $commit " >../commit
194 eval "$(set_ident AUTHOR <../commit)" ||
195 die "setting author failed for commit $commit "
196 eval "$(set_ident COMMITTER <../commit)" ||
197 die "setting committer failed for commit $commit "
198 eval " $filter_env " < /dev/null ||
199 die "env filter failed: $filter_env "
201 if [ " $filter_tree " ]; then
202 git checkout-index -f -u -a
203 # files that $commit removed are now still in the working tree;
204 # remove them, else they would be added again
205 git ls-files -z --others | xargs -0 rm -f
206 eval " $filter_tree " < /dev/null ||
207 die "tree filter failed: $filter_tree "
209 git diff-index -r $commit | cut -f 2- | tr ' \n ' ' \
0 ' | \
210 xargs -0 git update-index --add --replace --remove
211 git ls-files -z --others | \
212 xargs -0 git update-index --add --replace --remove
215 eval " $filter_index " < /dev/null ||
216 die "index filter failed: $filter_index "
219 for parent in $parents ; do
220 for reparent in $(map " $parent "); do
221 parentstr=" $parentstr -p $reparent "
224 if [ " $filter_parent " ]; then
225 parentstr="$(echo " $parentstr " | eval " $filter_parent ")" ||
226 die "parent filter failed: $filter_parent "
229 sed -e ' 1 ,/ ^$
/ d
' <../commit | \
230 eval " $filter_msg " > ../message ||
231 die "msg filter failed: $filter_msg "
232 sh -c " $filter_commit " "git commit-tree" \
233 $(git write-tree) $parentstr < ../message > ../map/ $commit
236 src_head=$(tail -n 1 ../revs | sed -e ' s
/ .
*// ')
237 target_head=$(head -n 1 ../map/ $src_head )
238 case " $target_head " in
240 echo Nothing rewritten
243 git update-ref refs/heads/" $dstbranch " $target_head
244 if [ $(wc -l <../map/ $src_head ) -gt 1 ]; then
245 echo "WARNING: Your commit filter caused the head commit to expand to several rewritten commits. Only the first such commit was recorded as the current $dstbranch head but you will need to resolve the situation now (probably by manually merging the other commits). These are all the commits:" >&2
246 sed ' s
/ ^
/ / ' ../map/ $src_head >&2
252 if [ " $filter_tag_name " ]; then
253 git for-each-ref --format=' %( objectname
) %( objecttype
) %( refname
) ' refs/tags |
254 while read sha1 type ref; do
255 ref=" ${ref#refs/tags/} "
256 # XXX: Rewrite tagged trees as well?
257 if [ " $type " != "commit" -a " $type " != "tag" ]; then
261 if [ " $type " = "tag" ]; then
262 # Dereference to a commit
264 sha1="$(git rev-parse " $sha1 "^{commit} 2>/dev/null)" || continue
267 [ -f "../map/ $sha1 " ] || continue
268 new_sha1="$(cat "../map/ $sha1 ")"
269 export GIT_COMMIT=" $sha1 "
270 new_ref="$(echo " $ref " | eval " $filter_tag_name ")" ||
271 die "tag name filter failed: $filter_tag_name "
273 echo " $ref -> $new_ref ( $sha1 -> $new_sha1 )"
275 if [ " $type " = "tag" ]; then
276 # Warn that we are not rewriting the tag object itself.
277 warn "unreferencing tag object $sha1t "
280 git update-ref "refs/tags/ $new_ref " " $new_sha1 "
286 printf " \n Rewritten history saved to the $dstbranch branch \n "