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=${curr_branch#refs/heads/}
  92
  93         if [ -z "$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.${curr_branch}.merge = <remote-ref>"
 113                 echo "    remote.<nickname>.url = <url>"
 114                 echo "    remote.<nickname>.fetch = <refspec>"
 115                 echo
 116                 echo "See git-config(1) for details."
 117         fi
 118         exit 1
 119 }
 120
 121 test true = "$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"
 126
 127         . git-parse-remote &&
 128         origin="$1"
 129         test -z "$origin" && origin=$(get_default_remote)
 130         reflist="$(get_remote_refs_for_fetch "$@" 2>/dev/null |
 131                 sed "s|refs/heads/\(.*\):|\1|")" &&
 132         oldremoteref="$(git rev-parse -q --verify \
 133                 "refs/remotes/$origin/$reflist")"
 134 }
 135 orig_head=$(git rev-parse -q --verify HEAD)
 136 git fetch $verbosity --update-head-ok "$@" || exit 1
 137
 138 curr_head=$(git rev-parse -q --verify HEAD)
 139 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 140 then
 141         # The fetch involved updating the current branch.
 142
 143         # The working tree and the index file is still based on the
 144         # $orig_head commit, but we are merging into $curr_head.
 145         # First update the working tree to match $curr_head.
 146
 147         echo >&2 "Warning: fetch updated the current branch head."
 148         echo >&2 "Warning: fast forwarding your working tree from"
 149         echo >&2 "Warning: commit $orig_head."
 150         git update-index --refresh 2>/dev/null
 151         git read-tree -u -m "$orig_head" "$curr_head" ||
 152                 die 'Cannot fast-forward your working tree.
 153 After making sure that you saved anything precious from
 154 $ git diff '$orig_head'
 155 output, run
 156 $ git reset --hard
 157 to recover.'
 158
 159 fi
 160
 161 merge_head=$(sed -e '/  not-for-merge   /d' \
 162         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 163         tr '\012' ' ')
 164
 165 case "$merge_head" in
 166 '')
 167         case $? in
 168         0) error_on_no_merge_candidates "$@";;
 169         1) echo >&2 "You are not currently on a branch; you must explicitly"
 170            echo >&2 "specify which branch you wish to merge:"
 171            echo >&2 "  git pull <remote> <branch>"
 172            exit 1;;
 173         *) exit $?;;
 174         esac
 175         ;;
 176 ?*' '?*)
 177         if test -z "$orig_head"
 178         then
 179                 echo >&2 "Cannot merge multiple branches into empty head"
 180                 exit 1
 181         fi
 182         if test true = "$rebase"
 183         then
 184                 echo >&2 "Cannot rebase onto multiple branches"
 185                 exit 1
 186         fi
 187         ;;
 188 esac
 189
 190 if test -z "$orig_head"
 191 then
 192         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 193         git read-tree --reset -u HEAD || exit 1
 194         exit
 195 fi
 196
 197 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 198 test true = "$rebase" &&
 199         exec git-rebase $strategy_args --onto $merge_head \
 200         ${oldremoteref:-$merge_head}
 201 exec git-merge $no_stat $no_commit $squash $no_ff $log_arg $strategy_args \
 202         "$merge_name" HEAD $merge_head $verbosity