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= 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 :
  24 do
  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                 no_stat=-n ;;
  32         --stat|--summary)
  33                 no_stat=$1 ;;
  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 ;;
  56                 *)
  57                         strategy="$2"
  58                         shift ;;
  59                 esac
  60                 strategy_args="${strategy_args}-s $strategy "
  61                 ;;
  62         -r|--r|--re|--reb|--reba|--rebas|--rebase)
  63                 rebase=true
  64                 ;;
  65         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  66                 rebase=false
  67                 ;;
  68         -h|--h|--he|--hel|--help)
  69                 usage
  70                 ;;
  71         *)
  72                 # Pass thru anything that may be meant for fetch.
  73                 break
  74                 ;;
  75         esac
  76         shift
  77 done
  78
  79 error_on_no_merge_candidates () {
  80         exec >&2
  81         for opt
  82         do
  83                 case "$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
  90
  91         curr_branch=${curr_branch#refs/heads/}
  92
  93         echo "You asked me to pull without telling me which branch you"
  94         echo "want to merge with, and 'branch.${curr_branch}.merge' in"
  95         echo "your configuration file does not tell me either.  Please"
  96         echo "name which branch you want to merge on the command line and"
  97         echo "try again (e.g. 'git pull <repository> <refspec>')."
  98         echo "See git-pull(1) for details on the refspec."
  99         echo
 100         echo "If you often merge with the same branch, you may want to"
 101         echo "configure the following variables in your configuration"
 102         echo "file:"
 103         echo
 104         echo "    branch.${curr_branch}.remote = <nickname>"
 105         echo "    branch.${curr_branch}.merge = <remote-ref>"
 106         echo "    remote.<nickname>.url = <url>"
 107         echo "    remote.<nickname>.fetch = <refspec>"
 108         echo
 109         echo "See git-config(1) for details."
 110         exit 1
 111 }
 112
 113 test true = "$rebase" && {
 114         git update-index --ignore-submodules --refresh &&
 115         git diff-files --ignore-submodules --quiet &&
 116         git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 117         die "refusing to pull with rebase: your working tree is not up-to-date"
 118
 119         . git-parse-remote &&
 120         origin="$1"
 121         test -z "$origin" && origin=$(get_default_remote)
 122         reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
 123                 sed "s|refs/heads/\(.*\):|\1|")" &&
 124         oldremoteref="$(git rev-parse -q --verify \
 125                 "refs/remotes/$origin/$reflist")"
 126 }
 127 orig_head=$(git rev-parse -q --verify HEAD)
 128 git fetch $verbosity --update-head-ok "$@" || exit 1
 129
 130 curr_head=$(git rev-parse -q --verify HEAD)
 131 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 132 then
 133         # The fetch involved updating the current branch.
 134
 135         # The working tree and the index file is still based on the
 136         # $orig_head commit, but we are merging into $curr_head.
 137         # First update the working tree to match $curr_head.
 138
 139         echo >&2 "Warning: fetch updated the current branch head."
 140         echo >&2 "Warning: fast forwarding your working tree from"
 141         echo >&2 "Warning: commit $orig_head."
 142         git update-index --refresh 2>/dev/null
 143         git read-tree -u -m "$orig_head" "$curr_head" ||
 144                 die 'Cannot fast-forward your working tree.
 145 After making sure that you saved anything precious from
 146 $ git diff '$orig_head'
 147 output, run
 148 $ git reset --hard
 149 to recover.'
 150
 151 fi
 152
 153 merge_head=$(sed -e '/  not-for-merge   /d' \
 154         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 155         tr '\012' ' ')
 156
 157 case "$merge_head" in
 158 '')
 159         case $? in
 160         0) error_on_no_merge_candidates "$@";;
 161         1) echo >&2 "You are not currently on a branch; you must explicitly"
 162            echo >&2 "specify which branch you wish to merge:"
 163            echo >&2 "  git pull <remote> <branch>"
 164            exit 1;;
 165         *) exit $?;;
 166         esac
 167         ;;
 168 ?*' '?*)
 169         if test -z "$orig_head"
 170         then
 171                 echo >&2 "Cannot merge multiple branches into empty head"
 172                 exit 1
 173         fi
 174         ;;
 175 esac
 176
 177 if test -z "$orig_head"
 178 then
 179         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 180         git read-tree --reset -u HEAD || exit 1
 181         exit
 182 fi
 183
 184 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 185 test true = "$rebase" &&
 186         exec git-rebase $strategy_args --onto $merge_head \
 187         ${oldremoteref:-$merge_head}
 188 exec git-merge $no_stat $no_commit $squash $no_ff $log_arg $strategy_args \
 189         "$merge_name" HEAD $merge_head $verbosity