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