1#!/bin/sh
2#
3# Copyright (c) 2005 Junio C Hamano
4#
5# Fetch one or more remote refs and merge it/them into the current HEAD.
6USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff|--ff-only] [--[no-]rebase|--rebase=preserve] [-s strategy]... [<fetch-options>] <repo> <head>...'
8LONG_USAGE='Fetch one or more remote refs and integrate it/them with the current HEAD.'
9SUBDIRECTORY_OK=Yes
10OPTIONS_SPEC=
11. git-sh-setup
12. git-sh-i18n
13set_reflog_action "pull${1+ $*}"
14require_work_tree_exists
15cd_to_toplevel
16die_conflict () {
19 git diff-index --cached --name-status -r --ignore-submodules HEAD --
20 if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
21 die "$(gettext "Pull is not possible because you have unmerged files.
22Please, fix them up in the work tree, and then use 'git add/rm <file>'
23as appropriate to mark resolution and make a commit.")"
24 else
25 die "$(gettext "Pull is not possible because you have unmerged files.")"
26 fi
27}
28die_merge () {
30 if [ $(git config --bool --get advice.resolveConflict || echo true) = "true" ]; then
31 die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).
32Please, commit your changes before you can merge.")"
33 else
34 die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
35 fi
36}
37test -z "$(git ls-files -u)" || die_conflict
39test -f "$GIT_DIR/MERGE_HEAD" && die_merge
40bool_or_string_config () {
42 git config --bool "$1" 2>/dev/null || git config "$1"
43}
44strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
46log_arg= verbosity= progress= recurse_submodules= verify_signatures=
47merge_args= edit= rebase_args=
48curr_branch=$(git symbolic-ref -q HEAD)
49curr_branch_short="${curr_branch#refs/heads/}"
50rebase=$(bool_or_string_config branch.$curr_branch_short.rebase)
51if test -z "$rebase"
52then
53 rebase=$(bool_or_string_config pull.rebase)
54fi
55# Setup default fast-forward options via `pull.ff`
57pull_ff=$(bool_or_string_config pull.ff)
58case "$pull_ff" in
59true)
60 no_ff=--ff
61 ;;
62false)
63 no_ff=--no-ff
64 ;;
65only)
66 ff_only=--ff-only
67 ;;
68esac
69dry_run=
72while :
73do
74 case "$1" in
75 -q|--quiet)
76 verbosity="$verbosity -q" ;;
77 -v|--verbose)
78 verbosity="$verbosity -v" ;;
79 --progress)
80 progress=--progress ;;
81 --no-progress)
82 progress=--no-progress ;;
83 -n|--no-stat|--no-summary)
84 diffstat=--no-stat ;;
85 --stat|--summary)
86 diffstat=--stat ;;
87 --log|--log=*|--no-log)
88 log_arg="$1" ;;
89 --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
90 no_commit=--no-commit ;;
91 --c|--co|--com|--comm|--commi|--commit)
92 no_commit=--commit ;;
93 -e|--edit)
94 edit=--edit ;;
95 --no-edit)
96 edit=--no-edit ;;
97 --sq|--squ|--squa|--squas|--squash)
98 squash=--squash ;;
99 --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
100 squash=--no-squash ;;
101 --ff)
102 no_ff=--ff ;;
103 --no-ff)
104 no_ff=--no-ff ;;
105 --ff-only)
106 ff_only=--ff-only ;;
107 -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
108 --strateg=*|--strategy=*|\
109 -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
110 case "$#,$1" in
111 *,*=*)
112 strategy=$(expr "z$1" : 'z-[^=]*=\(.*\)') ;;
113 1,*)
114 usage ;;
115 *)
116 strategy="$2"
117 shift ;;
118 esac
119 strategy_args="${strategy_args}-s $strategy "
120 ;;
121 -X*)
122 case "$#,$1" in
123 1,-X)
124 usage ;;
125 *,-X)
126 xx="-X $(git rev-parse --sq-quote "$2")"
127 shift ;;
128 *,*)
129 xx=$(git rev-parse --sq-quote "$1") ;;
130 esac
131 merge_args="$merge_args$xx "
132 ;;
133 -r=*|--r=*|--re=*|--reb=*|--reba=*|--rebas=*|--rebase=*)
134 rebase="${1#*=}"
135 ;;
136 -r|--r|--re|--reb|--reba|--rebas|--rebase)
137 rebase=true
138 ;;
139 --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
140 rebase=false
141 ;;
142 --recurse-submodules)
143 recurse_submodules=--recurse-submodules
144 ;;
145 --recurse-submodules=*)
146 recurse_submodules="$1"
147 ;;
148 --no-recurse-submodules)
149 recurse_submodules=--no-recurse-submodules
150 ;;
151 --verify-signatures)
152 verify_signatures=--verify-signatures
153 ;;
154 --no-verify-signatures)
155 verify_signatures=--no-verify-signatures
156 ;;
157 --gpg-sign|-S)
158 gpg_sign_args=-S
159 ;;
160 --gpg-sign=*)
161 gpg_sign_args=$(git rev-parse --sq-quote "-S${1#--gpg-sign=}")
162 ;;
163 -S*)
164 gpg_sign_args=$(git rev-parse --sq-quote "$1")
165 ;;
166 --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
167 dry_run=--dry-run
168 ;;
169 -h|--help-all)
170 usage
171 ;;
172 *)
173 # Pass thru anything that may be meant for fetch.
174 break
175 ;;
176 esac
177 shift
178done
179case "$rebase" in
181preserve)
182 rebase=true
183 rebase_args=--preserve-merges
184 ;;
185true|false|'')
186 ;;
187*)
188 echo "Invalid value for --rebase, should be true, false, or preserve"
189 usage
190 exit 1
191 ;;
192esac
193error_on_no_merge_candidates () {
195 exec >&2
196 for opt
197 do
198 case "$opt" in
199 -t|--t|--ta|--tag|--tags)
200 echo "It doesn't make sense to pull all tags; you probably meant:"
201 echo " git fetch --tags"
202 exit 1
203 esac
204 done
205 if test true = "$rebase"
207 then
208 op_type=rebase
209 op_prep=against
210 else
211 op_type=merge
212 op_prep=with
213 fi
214 upstream=$(git config "branch.$curr_branch_short.merge")
216 remote=$(git config "branch.$curr_branch_short.remote")
217 if [ $# -gt 1 ]; then
219 if [ "$rebase" = true ]; then
220 printf "There is no candidate for rebasing against "
221 else
222 printf "There are no candidates for merging "
223 fi
224 echo "among the refs that you just fetched."
225 echo "Generally this means that you provided a wildcard refspec which had no"
226 echo "matches on the remote end."
227 elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
228 echo "You asked to pull from the remote '$1', but did not specify"
229 echo "a branch. Because this is not the default configured remote"
230 echo "for your current branch, you must specify a branch on the command line."
231 elif [ -z "$curr_branch" -o -z "$upstream" ]; then
232 . git-parse-remote
233 error_on_missing_default_upstream "pull" $op_type $op_prep \
234 "git pull <remote> <branch>"
235 else
236 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
237 echo "from the remote, but no such ref was fetched."
238 fi
239 exit 1
240}
241test true = "$rebase" && {
243 if ! git rev-parse -q --verify HEAD >/dev/null
244 then
245 # On an unborn branch
246 if test -f "$GIT_DIR/index"
247 then
248 die "$(gettext "updating an unborn branch with changes added to the index")"
249 fi
250 else
251 require_clean_work_tree "pull with rebase" "Please commit or stash them."
252 fi
253 oldremoteref= &&
254 test -n "$curr_branch" &&
255 . git-parse-remote &&
256 remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
257 oldremoteref=$(git merge-base --fork-point "$remoteref" $curr_branch 2>/dev/null)
258}
259orig_head=$(git rev-parse -q --verify HEAD)
260git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
261test -z "$dry_run" || exit 0
262curr_head=$(git rev-parse -q --verify HEAD)
264if test -n "$orig_head" && test "$curr_head" != "$orig_head"
265then
266 # The fetch involved updating the current branch.
267 # The working tree and the index file is still based on the
269 # $orig_head commit, but we are merging into $curr_head.
270 # First update the working tree to match $curr_head.
271 eval_gettextln "Warning: fetch updated the current branch head.
273Warning: fast-forwarding your working tree from
274Warning: commit \$orig_head." >&2
275 git update-index -q --refresh
276 git read-tree -u -m "$orig_head" "$curr_head" ||
277 die "$(eval_gettext "Cannot fast-forward your working tree.
278After making sure that you saved anything precious from
279$ git diff \$orig_head
280output, run
281$ git reset --hard
282to recover.")"
283fi
285merge_head=$(sed -e '/ not-for-merge /d' \
287 -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
288 tr '\012' ' ')
289case "$merge_head" in
291'')
292 error_on_no_merge_candidates "$@"
293 ;;
294?*' '?*)
295 if test -z "$orig_head"
296 then
297 die "$(gettext "Cannot merge multiple branches into empty head")"
298 fi
299 if test true = "$rebase"
300 then
301 die "$(gettext "Cannot rebase onto multiple branches")"
302 fi
303 ;;
304esac
305# Pulling into unborn branch: a shorthand for branching off
307# FETCH_HEAD, for lazy typers.
308if test -z "$orig_head"
309then
310 # Two-way merge: we claim the index is based on an empty tree,
311 # and try to fast-forward to HEAD. This ensures we will not
312 # lose index/worktree changes that the user already made on
313 # the unborn branch.
314 empty_tree=4b825dc642cb6eb9a060e54bf8d69288fbee4904
315 git read-tree -m -u $empty_tree $merge_head &&
316 git update-ref -m "initial pull" HEAD $merge_head "$curr_head"
317 exit
318fi
319if test true = "$rebase"
321then
322 o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
323 if test "$oldremoteref" = "$o"
324 then
325 unset oldremoteref
326 fi
327fi
328merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
330case "$rebase" in
331true)
332 eval="git-rebase $diffstat $strategy_args $merge_args $rebase_args $verbosity"
333 eval="$eval $gpg_sign_args"
334 eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
335 ;;
336*)
337 eval="git-merge $diffstat $no_commit $verify_signatures $edit $squash $no_ff $ff_only"
338 eval="$eval $log_arg $strategy_args $merge_args $verbosity $progress"
339 eval="$eval $gpg_sign_args"
340 eval="$eval \"\$merge_name\" HEAD $merge_head"
341 ;;
342esac
343eval "exec $eval"