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)
  27                 no_stat=-n ;;
  28         --stat)
  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 update-index --ignore-submodules --refresh &&
 111         git diff-files --ignore-submodules --quiet &&
 112         git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 113         die "refusing to pull with rebase: your working tree is not up-to-date"
 114
 115         . git-parse-remote &&
 116         origin="$1"
 117         test -z "$origin" && origin=$(get_default_remote)
 118         reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
 119                 sed "s|refs/heads/\(.*\):|\1|")" &&
 120         oldremoteref="$(git rev-parse --verify \
 121                 "refs/remotes/$origin/$reflist" 2>/dev/null)"
 122 }
 123 orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
 124 git fetch --update-head-ok "$@" || exit 1
 125
 126 curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
 127 if test "$curr_head" != "$orig_head"
 128 then
 129         # The fetch involved updating the current branch.
 130
 131         # The working tree and the index file is still based on the
 132         # $orig_head commit, but we are merging into $curr_head.
 133         # First update the working tree to match $curr_head.
 134
 135         echo >&2 "Warning: fetch updated the current branch head."
 136         echo >&2 "Warning: fast forwarding your working tree from"
 137         echo >&2 "Warning: commit $orig_head."
 138         git update-index --refresh 2>/dev/null
 139         git read-tree -u -m "$orig_head" "$curr_head" ||
 140                 die 'Cannot fast-forward your working tree.
 141 After making sure that you saved anything precious from
 142 $ git diff '$orig_head'
 143 output, run
 144 $ git reset --hard
 145 to recover.'
 146
 147 fi
 148
 149 merge_head=$(sed -e '/  not-for-merge   /d' \
 150         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 151         tr '\012' ' ')
 152
 153 case "$merge_head" in
 154 '')
 155         case $? in
 156         0) error_on_no_merge_candidates "$@";;
 157         1) echo >&2 "You are not currently on a branch; you must explicitly"
 158            echo >&2 "specify which branch you wish to merge:"
 159            echo >&2 "  git pull <remote> <branch>"
 160            exit 1;;
 161         *) exit $?;;
 162         esac
 163         ;;
 164 ?*' '?*)
 165         if test -z "$orig_head"
 166         then
 167                 echo >&2 "Cannot merge multiple branches into empty head"
 168                 exit 1
 169         fi
 170         ;;
 171 esac
 172
 173 if test -z "$orig_head"
 174 then
 175         git update-ref -m "initial pull" HEAD $merge_head "" &&
 176         git read-tree --reset -u HEAD || exit 1
 177         exit
 178 fi
 179
 180 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 181 test true = "$rebase" &&
 182         exec git-rebase $strategy_args --onto $merge_head \
 183         ${oldremoteref:-$merge_head}
 184 exec git-merge $no_stat $no_commit $squash $no_ff $log_arg $strategy_args \
 185         "$merge_name" HEAD $merge_head