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= diffstat= 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                 diffstat=--no-stat ;;
  32         --stat|--summary)
  33                 diffstat=--stat ;;
  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         reflist="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 129         oldremoteref="$(git rev-parse -q --verify \
 130                 "$reflist")"
 131 }
 132 orig_head=$(git rev-parse -q --verify HEAD)
 133 git fetch $verbosity --update-head-ok "$@" || exit 1
 134
 135 curr_head=$(git rev-parse -q --verify HEAD)
 136 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 137 then
 138         # The fetch involved updating the current branch.
 139
 140         # The working tree and the index file is still based on the
 141         # $orig_head commit, but we are merging into $curr_head.
 142         # First update the working tree to match $curr_head.
 143
 144         echo >&2 "Warning: fetch updated the current branch head."
 145         echo >&2 "Warning: fast forwarding your working tree from"
 146         echo >&2 "Warning: commit $orig_head."
 147         git update-index -q --refresh
 148         git read-tree -u -m "$orig_head" "$curr_head" ||
 149                 die 'Cannot fast-forward your working tree.
 150 After making sure that you saved anything precious from
 151 $ git diff '$orig_head'
 152 output, run
 153 $ git reset --hard
 154 to recover.'
 155
 156 fi
 157
 158 merge_head=$(sed -e '/  not-for-merge   /d' \
 159         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 160         tr '\012' ' ')
 161
 162 case "$merge_head" in
 163 '')
 164         case $? in
 165         0) error_on_no_merge_candidates "$@";;
 166         1) echo >&2 "You are not currently on a branch; you must explicitly"
 167            echo >&2 "specify which branch you wish to merge:"
 168            echo >&2 "  git pull <remote> <branch>"
 169            exit 1;;
 170         *) exit $?;;
 171         esac
 172         ;;
 173 ?*' '?*)
 174         if test -z "$orig_head"
 175         then
 176                 die "Cannot merge multiple branches into empty head"
 177         fi
 178         if test true = "$rebase"
 179         then
 180                 die "Cannot rebase onto multiple branches"
 181         fi
 182         ;;
 183 esac
 184
 185 if test -z "$orig_head"
 186 then
 187         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 188         git read-tree --reset -u HEAD || exit 1
 189         exit
 190 fi
 191
 192 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 193 test true = "$rebase" &&
 194         exec git-rebase $diffstat $strategy_args --onto $merge_head \
 195         ${oldremoteref:-$merge_head}
 196 exec git-merge $diffstat $no_commit $squash $no_ff $log_arg $strategy_args \
 197         "$merge_name" HEAD $merge_head $verbosity