git-am: print fair error message when format detection fails
[git/spearce.git] / git-pull.sh
blob4b78a0cd37ba70236a05f78fb5bed3f763348096
1 #!/bin/sh
3 # Copyright (c) 2005 Junio C Hamano
5 # Fetch one or more remote refs and merge it/them into the current HEAD.
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 set_reflog_action "pull $*"
13 require_work_tree
14 cd_to_toplevel
16 test -z "$(git ls-files -u)" ||
17 die "You are in the middle of a conflicted merge."
19 strategy_args= diffstat= no_commit= squash= no_ff= log_arg= verbosity=
20 curr_branch=$(git symbolic-ref -q HEAD)
21 curr_branch_short=$(echo "$curr_branch" | sed "s|refs/heads/||")
22 rebase=$(git config --bool branch.$curr_branch_short.rebase)
23 while :
25 case "$1" in
26 -q|--quiet)
27 verbosity="$verbosity -q" ;;
28 -v|--verbose)
29 verbosity="$verbosity -v" ;;
30 -n|--no-stat|--no-summary)
31 diffstat=--no-stat ;;
32 --stat|--summary)
33 diffstat=--stat ;;
34 --log|--no-log)
35 log_arg=$1 ;;
36 --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
37 no_commit=--no-commit ;;
38 --c|--co|--com|--comm|--commi|--commit)
39 no_commit=--commit ;;
40 --sq|--squ|--squa|--squas|--squash)
41 squash=--squash ;;
42 --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
43 squash=--no-squash ;;
44 --ff)
45 no_ff=--ff ;;
46 --no-ff)
47 no_ff=--no-ff ;;
48 -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
49 --strateg=*|--strategy=*|\
50 -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
51 case "$#,$1" in
52 *,*=*)
53 strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
54 1,*)
55 usage ;;
57 strategy="$2"
58 shift ;;
59 esac
60 strategy_args="${strategy_args}-s $strategy "
62 -r|--r|--re|--reb|--reba|--rebas|--rebase)
63 rebase=true
65 --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
66 rebase=false
68 -h|--h|--he|--hel|--help)
69 usage
72 # Pass thru anything that may be meant for fetch.
73 break
75 esac
76 shift
77 done
79 error_on_no_merge_candidates () {
80 exec >&2
81 for opt
83 case "$opt" in
84 -t|--t|--ta|--tag|--tags)
85 echo "Fetching tags only, you probably meant:"
86 echo " git fetch --tags"
87 exit 1
88 esac
89 done
91 curr_branch=${curr_branch#refs/heads/}
93 if [ -z "$curr_branch" ]; then
94 echo "You are not currently on a branch, so I cannot use any"
95 echo "'branch.<branchname>.merge' in your configuration file."
96 echo "Please specify which branch you want to merge on the command"
97 echo "line and try again (e.g. 'git pull <repository> <refspec>')."
98 echo "See git-pull(1) for details."
99 else
100 echo "You asked me to pull without telling me which branch you"
101 echo "want to merge with, and 'branch.${curr_branch}.merge' in"
102 echo "your configuration file does not tell me either. Please"
103 echo "specify which branch you want to merge on the command line and"
104 echo "try again (e.g. 'git pull <repository> <refspec>')."
105 echo "See git-pull(1) for details."
106 echo
107 echo "If you often merge with the same branch, you may want to"
108 echo "configure the following variables in your configuration"
109 echo "file:"
110 echo
111 echo " branch.${curr_branch}.remote = <nickname>"
112 echo " branch.${curr_branch}.merge = <remote-ref>"
113 echo " remote.<nickname>.url = <url>"
114 echo " remote.<nickname>.fetch = <refspec>"
115 echo
116 echo "See git-config(1) for details."
118 exit 1
121 test true = "$rebase" && {
122 git update-index --ignore-submodules --refresh &&
123 git diff-files --ignore-submodules --quiet &&
124 git diff-index --ignore-submodules --cached --quiet HEAD -- ||
125 die "refusing to pull with rebase: your working tree is not up-to-date"
127 . git-parse-remote &&
128 reflist="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
129 oldremoteref="$(git rev-parse -q --verify \
130 "$reflist")"
132 orig_head=$(git rev-parse -q --verify HEAD)
133 git fetch $verbosity --update-head-ok "$@" || exit 1
135 curr_head=$(git rev-parse -q --verify HEAD)
136 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
137 then
138 # The fetch involved updating the current branch.
140 # The working tree and the index file is still based on the
141 # $orig_head commit, but we are merging into $curr_head.
142 # First update the working tree to match $curr_head.
144 echo >&2 "Warning: fetch updated the current branch head."
145 echo >&2 "Warning: fast forwarding your working tree from"
146 echo >&2 "Warning: commit $orig_head."
147 git update-index -q --refresh
148 git read-tree -u -m "$orig_head" "$curr_head" ||
149 die 'Cannot fast-forward your working tree.
150 After making sure that you saved anything precious from
151 $ git diff '$orig_head'
152 output, run
153 $ git reset --hard
154 to recover.'
158 merge_head=$(sed -e '/ not-for-merge /d' \
159 -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | \
160 tr '\012' ' ')
162 case "$merge_head" in
164 case $? in
165 0) error_on_no_merge_candidates "$@";;
166 1) echo >&2 "You are not currently on a branch; you must explicitly"
167 echo >&2 "specify which branch you wish to merge:"
168 echo >&2 " git pull <remote> <branch>"
169 exit 1;;
170 *) exit $?;;
171 esac
173 ?*' '?*)
174 if test -z "$orig_head"
175 then
176 die "Cannot merge multiple branches into empty head"
178 if test true = "$rebase"
179 then
180 die "Cannot rebase onto multiple branches"
183 esac
185 if test -z "$orig_head"
186 then
187 git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
188 git read-tree --reset -u HEAD || exit 1
189 exit
192 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
193 test true = "$rebase" &&
194 exec git-rebase $diffstat $strategy_args --onto $merge_head \
195 ${oldremoteref:-$merge_head}
196 exec git-merge $diffstat $no_commit $squash $no_ff $log_arg $strategy_args \
197 "$merge_name" HEAD $merge_head $verbosity