aboutsummaryrefslogtreecommitdiff
path: root/git-rebase.sh
blob: c8bd0f99d1306cd311eaf45f73581efc8bb0e512 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano.
#

USAGE='[-v] [--onto <newbase>] <upstream> [<branch>]'
LONG_USAGE='git-rebase replaces <branch> with a new branch of the
same name.  When the --onto option is provided the new branch starts
out with a HEAD equal to <newbase>, otherwise it is equal to <upstream>
It then attempts to create a new commit for each commit from the original
<branch> that does not exist in the <upstream> branch.

It is possible that a merge failure will prevent this process from being
completely automatic.  You will have to resolve any such merge failure
and run git rebase --continue.  Another option is to bypass the commit
that caused the merge failure with git rebase --skip.  To restore the
original <branch> and remove the .dotest working files, use the command
git rebase --abort instead.

Note that if <branch> is not specified on the command line, the
currently checked out branch is used.  You must be in the top
directory of your project to start (or continue) a rebase.

Example:       git-rebase master~1 topic

        A---B---C topic                   A'\''--B'\''--C'\'' topic
       /                   -->           /
  D---E---F---G master          D---E---F---G master
'

SUBDIRECTORY_OK=Yes
. git-sh-setup
set_reflog_action rebase
require_work_tree
cd_to_toplevel

RESOLVEMSG="
When you have resolved this problem run \"git rebase --continue\".
If you would prefer to skip this patch, instead run \"git rebase --skip\".
To restore the original branch and stop rebasing run \"git rebase --abort\".
"
unset newbase
strategy=recursive
do_merge=
dotest=$GIT_DIR/.dotest-merge
prec=4
verbose=

continue_merge () {
	test -n "$prev_head" || die "prev_head must be defined"
	test -d "$dotest" || die "$dotest directory does not exist"

	unmerged=$(git-ls-files -u)
	if test -n "$unmerged"
	then
		echo "You still have unmerged paths in your index"
		echo "did you forget update-index?"
		die "$RESOLVEMSG"
	fi

	if test -n "`git-diff-index HEAD`"
	then
		if ! git-commit -C "`cat $dotest/current`"
		then
			echo "Commit failed, please do not call \"git commit\""
			echo "directly, but instead do one of the following: "
			die "$RESOLVEMSG"
		fi
		printf "Committed: %0${prec}d" $msgnum
	else
		printf "Already applied: %0${prec}d" $msgnum
	fi
	echo ' '`git-rev-list --pretty=oneline -1 HEAD | \
				sed 's/^[a-f0-9]\+ //'`

	prev_head=`git-rev-parse HEAD^0`
	# save the resulting commit so we can read-tree on it later
	echo "$prev_head" > "$dotest/prev_head"

	# onto the next patch:
	msgnum=$(($msgnum + 1))
	echo "$msgnum" >"$dotest/msgnum"
}

call_merge () {
	cmt="$(cat $dotest/cmt.$1)"
	echo "$cmt" > "$dotest/current"
	hd=$(git-rev-parse --verify HEAD)
	cmt_name=$(git-symbolic-ref HEAD)
	msgnum=$(cat $dotest/msgnum)
	end=$(cat $dotest/end)
	eval GITHEAD_$cmt='"${cmt_name##refs/heads/}~$(($end - $msgnum))"'
	eval GITHEAD_$hd='"$(cat $dotest/onto_name)"'
	export GITHEAD_$cmt GITHEAD_$hd
	git-merge-$strategy "$cmt^" -- "$hd" "$cmt"
	rv=$?
	case "$rv" in
	0)
		unset GITHEAD_$cmt GITHEAD_$hd
		return
		;;
	1)
		test -d "$GIT_DIR/rr-cache" && git-rerere
		die "$RESOLVEMSG"
		;;
	2)
		echo "Strategy: $rv $strategy failed, try another" 1>&2
		die "$RESOLVEMSG"
		;;
	*)
		die "Unknown exit code ($rv) from command:" \
			"git-merge-$strategy $cmt^ -- HEAD $cmt"
		;;
	esac
}

finish_rb_merge () {
	rm -r "$dotest"
	echo "All done."
}

while case "$#" in 0) break ;; esac
do
	case "$1" in
	--continue)
		diff=$(git-diff-files)
		case "$diff" in
		?*)	echo "You must edit all merge conflicts and then"
			echo "mark them as resolved using git update-index"
			exit 1
			;;
		esac
		if test -d "$dotest"
		then
			prev_head="`cat $dotest/prev_head`"
			end="`cat $dotest/end`"
			msgnum="`cat $dotest/msgnum`"
			onto="`cat $dotest/onto`"
			continue_merge
			while test "$msgnum" -le "$end"
			do
				call_merge "$msgnum"
				continue_merge
			done
			finish_rb_merge
			exit
		fi
		git am --resolved --3way --resolvemsg="$RESOLVEMSG"
		exit
		;;
	--skip)
		if test -d "$dotest"
		then
			if test -d "$GIT_DIR/rr-cache"
			then
				git-rerere clear
			fi
			prev_head="`cat $dotest/prev_head`"
			end="`cat $dotest/end`"
			msgnum="`cat $dotest/msgnum`"
			msgnum=$(($msgnum + 1))
			onto="`cat $dotest/onto`"
			while test "$msgnum" -le "$end"
			do
				call_merge "$msgnum"
				continue_merge
			done
			finish_rb_merge
			exit
		fi
		git am -3 --skip --resolvemsg="$RESOLVEMSG"
		exit
		;;
	--abort)
		if test -d "$GIT_DIR/rr-cache"
		then
			git-rerere clear
		fi
		if test -d "$dotest"
		then
			rm -r "$dotest"
		elif test -d .dotest
		then
			rm -r .dotest
		else
			die "No rebase in progress?"
		fi
		git reset --hard ORIG_HEAD
		exit
		;;
	--onto)
		test 2 -le "$#" || usage
		newbase="$2"
		shift
		;;
	-M|-m|--m|--me|--mer|--merg|--merge)
		do_merge=t
		;;
	-s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
		--strateg=*|--strategy=*|\
	-s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
		case "$#,$1" in
		*,*=*)
			strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
		1,*)
			usage ;;
		*)
			strategy="$2"
			shift ;;
		esac
		do_merge=t
		;;
	-v|--verbose)
		verbose=t
		;;
	-*)
		usage
		;;
	*)
		break
		;;
	esac
	shift
done

# Make sure we do not have .dotest
if test -z "$do_merge"
then
	if mkdir .dotest
	then
		rmdir .dotest
	else
		echo >&2 '
It seems that I cannot create a .dotest directory, and I wonder if you
are in the middle of patch application or another rebase.  If that is not
the case, please rm -fr .dotest and run me again.  I am stopping in case
you still have something valuable there.'
		exit 1
	fi
else
	if test -d "$dotest"
	then
		die "previous dotest directory $dotest still exists." \
			'try git-rebase < --continue | --abort >'
	fi
fi

# The tree must be really really clean.
git-update-index --refresh || exit
diff=$(git-diff-index --cached --name-status -r HEAD)
case "$diff" in
?*)	echo "$diff"
	exit 1
	;;
esac

# The upstream head must be given.  Make sure it is valid.
upstream_name="$1"
upstream=`git rev-parse --verify "${upstream_name}^0"` ||
    die "invalid upstream $upstream_name"

# If a hook exists, give it a chance to interrupt
if test -x "$GIT_DIR/hooks/pre-rebase"
then
	"$GIT_DIR/hooks/pre-rebase" ${1+"$@"} || {
		echo >&2 "The pre-rebase hook refused to rebase."
		exit 1
	}
fi

# If the branch to rebase is given, first switch to it.
case "$#" in
2)
	branch_name="$2"
	git-checkout "$2" || usage
	;;
*)
	branch_name=`git symbolic-ref HEAD` || die "No current branch"
	branch_name=`expr "z$branch_name" : 'zrefs/heads/\(.*\)'`
	;;
esac
branch=$(git-rev-parse --verify "${branch_name}^0") || exit

# Make sure the branch to rebase onto is valid.
onto_name=${newbase-"$upstream_name"}
onto=$(git-rev-parse --verify "${onto_name}^0") || exit

# Now we are rebasing commits $upstream..$branch on top of $onto

# Check if we are already based on $onto, but this should be
# done only when upstream and onto are the same.
mb=$(git-merge-base "$onto" "$branch")
if test "$upstream" = "$onto" && test "$mb" = "$onto"
then
	echo >&2 "Current branch $branch_name is up to date."
	exit 0
fi

if test -n "$verbose"
then
	echo "Changes from $mb to $onto:"
	git-diff-tree --stat --summary "$mb" "$onto"
fi

# Rewind the head to "$onto"; this saves our current head in ORIG_HEAD.
echo "First, rewinding head to replay your work on top of it..."
git-reset --hard "$onto"

# If the $onto is a proper descendant of the tip of the branch, then
# we just fast forwarded.
if test "$mb" = "$branch"
then
	echo >&2 "Fast-forwarded $branch_name to $onto_name."
	exit 0
fi

if test -z "$do_merge"
then
	git-format-patch -k --stdout --full-index --ignore-if-in-upstream "$upstream"..ORIG_HEAD |
	git am --binary -3 -k --resolvemsg="$RESOLVEMSG"
	exit $?
fi

# start doing a rebase with git-merge
# this is rename-aware if the recursive (default) strategy is used

mkdir -p "$dotest"
echo "$onto" > "$dotest/onto"
echo "$onto_name" > "$dotest/onto_name"
prev_head=`git-rev-parse HEAD^0`
echo "$prev_head" > "$dotest/prev_head"

msgnum=0
for cmt in `git-rev-list --no-merges "$upstream"..ORIG_HEAD \
			| @@PERL@@ -e 'print reverse <>'`
do
	msgnum=$(($msgnum + 1))
	echo "$cmt" > "$dotest/cmt.$msgnum"
done

echo 1 >"$dotest/msgnum"
echo $msgnum >"$dotest/end"

end=$msgnum
msgnum=1

while test "$msgnum" -le "$end"
do
	call_merge "$msgnum"
	continue_merge
done

finish_rb_merge