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