Merge branch 'ci/forbid-unwanted-current-branch-update'
[git] / git-pull.sh
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.
6
7 USAGE='[-n | --no-stat] [--[no-]commit] [--[no-]squash] [--[no-]ff] [-s strategy]... [<fetch-options>] <repo> <head>...'
8 LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
9 SUBDIRECTORY_OK=Yes
10 OPTIONS_SPEC=
11 . git-sh-setup
12 . git-sh-i18n
13 set_reflog_action "pull${1+ $*}"
14 require_work_tree
15 cd_to_toplevel
16
17
18 die_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.
22 Please, fix them up in the work tree, and then use 'git add/rm <file>'
23 as appropriate to mark resolution, or use 'git commit -a'.")"
24     else
25         die "$(gettext "Pull is not possible because you have unmerged files.")"
26     fi
27 }
28
29 die_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).
32 Please, commit your changes before you can merge.")"
33     else
34         die "$(gettext "You have not concluded your merge (MERGE_HEAD exists).")"
35     fi
36 }
37
38 test -z "$(git ls-files -u)" || die_conflict
39 test -f "$GIT_DIR/MERGE_HEAD" && die_merge
40
41 strategy_args= diffstat= no_commit= squash= no_ff= ff_only=
42 log_arg= verbosity= progress= recurse_submodules=
43 merge_args=
44 curr_branch=$(git symbolic-ref -q HEAD)
45 curr_branch_short="${curr_branch#refs/heads/}"
46 rebase=$(git config --bool branch.$curr_branch_short.rebase)
47 dry_run=
48 while :
49 do
50         case "$1" in
51         -q|--quiet)
52                 verbosity="$verbosity -q" ;;
53         -v|--verbose)
54                 verbosity="$verbosity -v" ;;
55         --progress)
56                 progress=--progress ;;
57         --no-progress)
58                 progress=--no-progress ;;
59         -n|--no-stat|--no-summary)
60                 diffstat=--no-stat ;;
61         --stat|--summary)
62                 diffstat=--stat ;;
63         --log|--no-log)
64                 log_arg=$1 ;;
65         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
66                 no_commit=--no-commit ;;
67         --c|--co|--com|--comm|--commi|--commit)
68                 no_commit=--commit ;;
69         --sq|--squ|--squa|--squas|--squash)
70                 squash=--squash ;;
71         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
72                 squash=--no-squash ;;
73         --ff)
74                 no_ff=--ff ;;
75         --no-ff)
76                 no_ff=--no-ff ;;
77         --ff-only)
78                 ff_only=--ff-only ;;
79         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
80                 --strateg=*|--strategy=*|\
81         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
82                 case "$#,$1" in
83                 *,*=*)
84                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
85                 1,*)
86                         usage ;;
87                 *)
88                         strategy="$2"
89                         shift ;;
90                 esac
91                 strategy_args="${strategy_args}-s $strategy "
92                 ;;
93         -X*)
94                 case "$#,$1" in
95                 1,-X)
96                         usage ;;
97                 *,-X)
98                         xx="-X $(git rev-parse --sq-quote "$2")"
99                         shift ;;
100                 *,*)
101                         xx=$(git rev-parse --sq-quote "$1") ;;
102                 esac
103                 merge_args="$merge_args$xx "
104                 ;;
105         -r|--r|--re|--reb|--reba|--rebas|--rebase)
106                 rebase=true
107                 ;;
108         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
109                 rebase=false
110                 ;;
111         --recurse-submodules)
112                 recurse_submodules=--recurse-submodules
113                 ;;
114         --recurse-submodules=*)
115                 recurse_submodules="$1"
116                 ;;
117         --no-recurse-submodules)
118                 recurse_submodules=--no-recurse-submodules
119                 ;;
120         --d|--dr|--dry|--dry-|--dry-r|--dry-ru|--dry-run)
121                 dry_run=--dry-run
122                 ;;
123         -h|--h|--he|--hel|--help|--help-|--help-a|--help-al|--help-all)
124                 usage
125                 ;;
126         *)
127                 # Pass thru anything that may be meant for fetch.
128                 break
129                 ;;
130         esac
131         shift
132 done
133
134 error_on_no_merge_candidates () {
135         exec >&2
136         for opt
137         do
138                 case "$opt" in
139                 -t|--t|--ta|--tag|--tags)
140                         echo "Fetching tags only, you probably meant:"
141                         echo "  git fetch --tags"
142                         exit 1
143                 esac
144         done
145
146         if test true = "$rebase"
147         then
148                 op_type=rebase
149                 op_prep=against
150         else
151                 op_type=merge
152                 op_prep=with
153         fi
154
155         curr_branch=${curr_branch#refs/heads/}
156         upstream=$(git config "branch.$curr_branch.merge")
157         remote=$(git config "branch.$curr_branch.remote")
158
159         if [ $# -gt 1 ]; then
160                 if [ "$rebase" = true ]; then
161                         printf "There is no candidate for rebasing against "
162                 else
163                         printf "There are no candidates for merging "
164                 fi
165                 echo "among the refs that you just fetched."
166                 echo "Generally this means that you provided a wildcard refspec which had no"
167                 echo "matches on the remote end."
168         elif [ $# -gt 0 ] && [ "$1" != "$remote" ]; then
169                 echo "You asked to pull from the remote '$1', but did not specify"
170                 echo "a branch. Because this is not the default configured remote"
171                 echo "for your current branch, you must specify a branch on the command line."
172         elif [ -z "$curr_branch" -o -z "$upstream" ]; then
173                 . git-parse-remote
174                 error_on_missing_default_upstream "pull" $op_type $op_prep \
175                         "git pull <repository> <refspec>"
176         else
177                 echo "Your configuration specifies to $op_type $op_prep the ref '${upstream#refs/heads/}'"
178                 echo "from the remote, but no such ref was fetched."
179         fi
180         exit 1
181 }
182
183 test true = "$rebase" && {
184         if ! git rev-parse -q --verify HEAD >/dev/null
185         then
186                 # On an unborn branch
187                 if test -f "$GIT_DIR/index"
188                 then
189                         die "$(gettext "updating an unborn branch with changes added to the index")"
190                 fi
191         else
192                 require_clean_work_tree "pull with rebase" "Please commit or stash them."
193         fi
194         oldremoteref= &&
195         . git-parse-remote &&
196         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
197         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
198         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
199         do
200                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
201                 then
202                         oldremoteref="$reflog"
203                         break
204                 fi
205         done
206 }
207 orig_head=$(git rev-parse -q --verify HEAD)
208 git fetch $verbosity $progress $dry_run $recurse_submodules --update-head-ok "$@" || exit 1
209 test -z "$dry_run" || exit 0
210
211 curr_head=$(git rev-parse -q --verify HEAD)
212 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
213 then
214         # The fetch involved updating the current branch.
215
216         # The working tree and the index file is still based on the
217         # $orig_head commit, but we are merging into $curr_head.
218         # First update the working tree to match $curr_head.
219
220         eval_gettextln "Warning: fetch updated the current branch head.
221 Warning: fast-forwarding your working tree from
222 Warning: commit \$orig_head." >&2
223         git update-index -q --refresh
224         git read-tree -u -m "$orig_head" "$curr_head" ||
225                 die "$(eval_gettext "Cannot fast-forward your working tree.
226 After making sure that you saved anything precious from
227 $ git diff \$orig_head
228 output, run
229 $ git reset --hard
230 to recover.")"
231
232 fi
233
234 merge_head=$(sed -e '/  not-for-merge   /d' \
235         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
236         tr '\012' ' ')
237
238 case "$merge_head" in
239 '')
240         error_on_no_merge_candidates "$@"
241         ;;
242 ?*' '?*)
243         if test -z "$orig_head"
244         then
245                 die "$(gettext "Cannot merge multiple branches into empty head")"
246         fi
247         if test true = "$rebase"
248         then
249                 die "$(gettext "Cannot rebase onto multiple branches")"
250         fi
251         ;;
252 esac
253
254 if test -z "$orig_head"
255 then
256         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
257         git read-tree -m -u HEAD || exit 1
258         exit
259 fi
260
261 if test true = "$rebase"
262 then
263         o=$(git show-branch --merge-base $curr_branch $merge_head $oldremoteref)
264         if test "$oldremoteref" = "$o"
265         then
266                 unset oldremoteref
267         fi
268 fi
269
270 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
271 case "$rebase" in
272 true)
273         eval="git-rebase $diffstat $strategy_args $merge_args"
274         eval="$eval --onto $merge_head ${oldremoteref:-$merge_head}"
275         ;;
276 *)
277         eval="git-merge $diffstat $no_commit $squash $no_ff $ff_only"
278         eval="$eval  $log_arg $strategy_args $merge_args $verbosity $progress"
279         eval="$eval \"\$merge_name\" HEAD $merge_head"
280         ;;
281 esac
282 eval "exec $eval"