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 set_reflog_action "pull $*"
  13 require_work_tree
  14 cd_to_toplevel
  15
  16 test -z "$(git ls-files -u)" ||
  17         die "You are in the middle of a conflicted merge."
  18
  19 strategy_args= no_stat= no_commit= squash= no_ff= log_arg=
  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 :
  24 do
  25         case "$1" in
  26         -n|--no-stat|--no-summary)
  27                 no_stat=-n ;;
  28         --stat|--summary)
  29                 no_stat=$1 ;;
  30         --log|--no-log)
  31                 log_arg=$1 ;;
  32         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  33                 no_commit=--no-commit ;;
  34         --c|--co|--com|--comm|--commi|--commit)
  35                 no_commit=--commit ;;
  36         --sq|--squ|--squa|--squas|--squash)
  37                 squash=--squash ;;
  38         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  39                 squash=--no-squash ;;
  40         --ff)
  41                 no_ff=--ff ;;
  42         --no-ff)
  43                 no_ff=--no-ff ;;
  44         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  45                 --strateg=*|--strategy=*|\
  46         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  47                 case "$#,$1" in
  48                 *,*=*)
  49                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  50                 1,*)
  51                         usage ;;
  52                 *)
  53                         strategy="$2"
  54                         shift ;;
  55                 esac
  56                 strategy_args="${strategy_args}-s $strategy "
  57                 ;;
  58         -r|--r|--re|--reb|--reba|--rebas|--rebase)
  59                 rebase=true
  60                 ;;
  61         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  62                 rebase=false
  63                 ;;
  64         -h|--h|--he|--hel|--help)
  65                 usage
  66                 ;;
  67         *)
  68                 # Pass thru anything that may be meant for fetch.
  69                 break
  70                 ;;
  71         esac
  72         shift
  73 done
  74
  75 error_on_no_merge_candidates () {
  76         exec >&2
  77         for opt
  78         do
  79                 case "$opt" in
  80                 -t|--t|--ta|--tag|--tags)
  81                         echo "Fetching tags only, you probably meant:"
  82                         echo "  git fetch --tags"
  83                         exit 1
  84                 esac
  85         done
  86
  87         curr_branch=${curr_branch#refs/heads/}
  88
  89         echo "You asked me to pull without telling me which branch you"
  90         echo "want to merge with, and 'branch.${curr_branch}.merge' in"
  91         echo "your configuration file does not tell me either.  Please"
  92         echo "name which branch you want to merge on the command line and"
  93         echo "try again (e.g. 'git pull <repository> <refspec>')."
  94         echo "See git-pull(1) for details on the refspec."
  95         echo
  96         echo "If you often merge with the same branch, you may want to"
  97         echo "configure the following variables in your configuration"
  98         echo "file:"
  99         echo
 100         echo "    branch.${curr_branch}.remote = <nickname>"
 101         echo "    branch.${curr_branch}.merge = <remote-ref>"
 102         echo "    remote.<nickname>.url = <url>"
 103         echo "    remote.<nickname>.fetch = <refspec>"
 104         echo
 105         echo "See git-config(1) for details."
 106         exit 1
 107 }
 108
 109 test true = "$rebase" && {
 110         . git-parse-remote &&
 111         origin="$1"
 112         test -z "$origin" && origin=$(get_default_remote)
 113         reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
 114                 sed "s|refs/heads/\(.*\):|\1|")" &&
 115         oldremoteref="$(git rev-parse --verify \
 116                 "refs/remotes/$origin/$reflist" 2>/dev/null)"
 117 }
 118 orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
 119 git-fetch --update-head-ok "$@" || exit 1
 120
 121 curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
 122 if test "$curr_head" != "$orig_head"
 123 then
 124         # The fetch involved updating the current branch.
 125
 126         # The working tree and the index file is still based on the
 127         # $orig_head commit, but we are merging into $curr_head.
 128         # First update the working tree to match $curr_head.
 129
 130         echo >&2 "Warning: fetch updated the current branch head."
 131         echo >&2 "Warning: fast forwarding your working tree from"
 132         echo >&2 "Warning: commit $orig_head."
 133         git update-index --refresh 2>/dev/null
 134         git read-tree -u -m "$orig_head" "$curr_head" ||
 135                 die 'Cannot fast-forward your working tree.
 136 After making sure that you saved anything precious from
 137 $ git diff '$orig_head'
 138 output, run
 139 $ git reset --hard
 140 to recover.'
 141
 142 fi
 143
 144 merge_head=$(sed -e '/  not-for-merge   /d' \
 145         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 146         tr '\012' ' ')
 147
 148 case "$merge_head" in
 149 '')
 150         case $? in
 151         0) error_on_no_merge_candidates "$@";;
 152         1) echo >&2 "You are not currently on a branch; you must explicitly"
 153            echo >&2 "specify which branch you wish to merge:"
 154            echo >&2 "  git pull <remote> <branch>"
 155            exit 1;;
 156         *) exit $?;;
 157         esac
 158         ;;
 159 ?*' '?*)
 160         if test -z "$orig_head"
 161         then
 162                 echo >&2 "Cannot merge multiple branches into empty head"
 163                 exit 1
 164         fi
 165         ;;
 166 esac
 167
 168 if test -z "$orig_head"
 169 then
 170         git update-ref -m "initial pull" HEAD $merge_head "" &&
 171         git read-tree --reset -u HEAD || exit 1
 172         exit
 173 fi
 174
 175 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 176 test true = "$rebase" &&
 177         exec git-rebase $strategy_args --onto $merge_head \
 178         ${oldremoteref:-$merge_head}
 179 exec git-merge $no_stat $no_commit $squash $no_ff $log_arg $strategy_args \
 180         "$merge_name" HEAD $merge_head