Documentation/git-http-fetch.txt: Document the commit-id argument.
[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 . git-sh-setup
8
9 usage () {
10     echo >&2 "usage: $0"' [-n] [--no-commit] [--no-summary] [--help]
11     [-s strategy]...
12     [<fetch-options>]
13     <repo> <head>...
14
15 Fetch one or more remote refs and merge it/them into the current HEAD.
16 '
17     exit 1
18 }
19
20 strategy_args= no_summary= no_commit=
21 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
22 do
23         case "$1" in
24         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
25                 --no-summa|--no-summar|--no-summary)
26                 no_summary=-n ;;
27         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
28                 no_commit=--no-commit ;;
29         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
30                 --strateg=*|--strategy=*|\
31         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
32                 case "$#,$1" in
33                 *,*=*)
34                         strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
35                 1,*)
36                         usage ;;
37                 *)
38                         strategy="$2"
39                         shift ;;
40                 esac
41                 strategy_args="${strategy_args}-s $strategy "
42                 ;;
43         -h|--h|--he|--hel|--help)
44                 usage
45                 ;;
46         -*)
47                 # Pass thru anything that is meant for fetch.
48                 break
49                 ;;
50         esac
51         shift
52 done
53
54 orig_head=$(git-rev-parse --verify HEAD) || die "Pulling into a black hole?"
55 git-fetch --update-head-ok "$@" || exit 1
56
57 curr_head=$(git-rev-parse --verify HEAD)
58 if test "$curr_head" != "$orig_head"
59 then
60         # The fetch involved updating the current branch.
61
62         # The working tree and the index file is still based on the
63         # $orig_head commit, but we are merging into $curr_head.
64         # First update the working tree to match $curr_head.
65
66         echo >&2 "Warning: fetch updated the current branch head."
67         echo >&2 "Warning: fast forwarding your working tree."
68         git-read-tree -u -m "$orig_head" "$curr_head" ||
69                 die "You need to first update your working tree."
70 fi
71
72 merge_head=$(sed -e '/  not-for-merge   /d' \
73         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
74         tr '\012' ' ')
75
76 case "$merge_head" in
77 '')
78         echo >&2 "No changes."
79         exit 0
80         ;;
81 ?*' '?*)
82         var=`git-var -l | sed -ne 's/^pull\.octopus=/-s /p'`
83         if test '' = "$var"
84         then
85                 strategy_default_args='-s octopus'
86         else
87                 strategy_default_args=$var
88         fi
89         ;;
90 *)
91         var=`git-var -l | sed -ne 's/^pull\.twohead=/-s /p'`
92         if test '' = "$var"
93         then
94                 strategy_default_args='-s recursive'
95         else
96                 strategy_default_args=$var
97         fi
98         ;;
99 esac
100
101 case "$strategy_args" in
102 '')
103         strategy_args=$strategy_default_args
104         ;;
105 esac
106
107 merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD")
108 git-merge $no_summary $no_commit $strategy_args "$merge_name" HEAD $merge_head