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=${curr_branch#refs/heads/}
  92         upstream=$(git config "branch.$curr_branch.merge")
  93
  94         if [ -z "$curr_branch" ]; then
  95                 echo "You are not currently on a branch, so I cannot use any"
  96                 echo "'branch.<branchname>.merge' in your configuration file."
  97                 echo "Please specify which branch you want to merge on the command"
  98                 echo "line and try again (e.g. 'git pull <repository> <refspec>')."
  99                 echo "See git-pull(1) for details."
 100         elif [ -z "$upstream" ]; then
 101                 echo "You asked me to pull without telling me which branch you"
 102                 echo "want to merge with, and 'branch.${curr_branch}.merge' in"
 103                 echo "your configuration file does not tell me either.  Please"
 104                 echo "specify which branch you want to merge on the command line and"
 105                 echo "try again (e.g. 'git pull <repository> <refspec>')."
 106                 echo "See git-pull(1) for details."
 107                 echo
 108                 echo "If you often merge with the same branch, you may want to"
 109                 echo "configure the following variables in your configuration"
 110                 echo "file:"
 111                 echo
 112                 echo "    branch.${curr_branch}.remote = <nickname>"
 113                 echo "    branch.${curr_branch}.merge = <remote-ref>"
 114                 echo "    remote.<nickname>.url = <url>"
 115                 echo "    remote.<nickname>.fetch = <refspec>"
 116                 echo
 117                 echo "See git-config(1) for details."
 118         else
 119                 echo "Your configuration specifies to merge the ref"
 120                 echo "'${upstream#refs/heads/}' from the remote, but no such ref"
 121                 echo "was fetched."
 122         fi
 123         exit 1
 124 }
 125
 126 test true = "$rebase" && {
 127         if ! git rev-parse -q --verify HEAD >/dev/null
 128         then
 129                 # On an unborn branch
 130                 if test -f "$GIT_DIR/index"
 131                 then
 132                         die "updating an unborn branch with changes added to the index"
 133                 fi
 134         else
 135                 git update-index --ignore-submodules --refresh &&
 136                 git diff-files --ignore-submodules --quiet &&
 137                 git diff-index --ignore-submodules --cached --quiet HEAD -- ||
 138                 die "refusing to pull with rebase: your working tree is not up-to-date"
 139         fi
 140         oldremoteref= &&
 141         . git-parse-remote &&
 142         remoteref="$(get_remote_merge_branch "$@" 2>/dev/null)" &&
 143         oldremoteref="$(git rev-parse -q --verify "$remoteref")" &&
 144         for reflog in $(git rev-list -g $remoteref 2>/dev/null)
 145         do
 146                 if test "$reflog" = "$(git merge-base $reflog $curr_branch)"
 147                 then
 148                         oldremoteref="$reflog"
 149                         break
 150                 fi
 151         done
 152 }
 153 orig_head=$(git rev-parse -q --verify HEAD)
 154 git fetch $verbosity --update-head-ok "$@" || exit 1
 155
 156 curr_head=$(git rev-parse -q --verify HEAD)
 157 if test -n "$orig_head" && test "$curr_head" != "$orig_head"
 158 then
 159         # The fetch involved updating the current branch.
 160
 161         # The working tree and the index file is still based on the
 162         # $orig_head commit, but we are merging into $curr_head.
 163         # First update the working tree to match $curr_head.
 164
 165         echo >&2 "Warning: fetch updated the current branch head."
 166         echo >&2 "Warning: fast forwarding your working tree from"
 167         echo >&2 "Warning: commit $orig_head."
 168         git update-index -q --refresh
 169         git read-tree -u -m "$orig_head" "$curr_head" ||
 170                 die 'Cannot fast-forward your working tree.
 171 After making sure that you saved anything precious from
 172 $ git diff '$orig_head'
 173 output, run
 174 $ git reset --hard
 175 to recover.'
 176
 177 fi
 178
 179 merge_head=$(sed -e '/  not-for-merge   /d' \
 180         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 181         tr '\012' ' ')
 182
 183 case "$merge_head" in
 184 '')
 185         case $? in
 186         0) error_on_no_merge_candidates "$@";;
 187         1) echo >&2 "You are not currently on a branch; you must explicitly"
 188            echo >&2 "specify which branch you wish to merge:"
 189            echo >&2 "  git pull <remote> <branch>"
 190            exit 1;;
 191         *) exit $?;;
 192         esac
 193         ;;
 194 ?*' '?*)
 195         if test -z "$orig_head"
 196         then
 197                 die "Cannot merge multiple branches into empty head"
 198         fi
 199         if test true = "$rebase"
 200         then
 201                 die "Cannot rebase onto multiple branches"
 202         fi
 203         ;;
 204 esac
 205
 206 if test -z "$orig_head"
 207 then
 208         git update-ref -m "initial pull" HEAD $merge_head "$curr_head" &&
 209         git read-tree --reset -u HEAD || exit 1
 210         exit
 211 fi
 212
 213 merge_name=$(git fmt-merge-msg $log_arg <"$GIT_DIR/FETCH_HEAD") || exit
 214 test true = "$rebase" &&
 215         exec git-rebase $diffstat $strategy_args --onto $merge_head \
 216         ${oldremoteref:-$merge_head}
 217 exec git-merge $diffstat $no_commit $squash $no_ff $log_arg $strategy_args \
 218         "$merge_name" HEAD $merge_head $verbosity