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-summary] [--[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_summary= no_commit= squash= no_ff=
  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         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  27                 --no-summa|--no-summar|--no-summary)
  28                 no_summary=-n ;;
  29         --summary)
  30                 no_summary=$1
  31                 ;;
  32         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  33                 no_commit=--no-commit ;;
  34         --c|--co|--com|--comm|--commi|--commit)
  35                 no_commit=--commit ;;
  36         --sq|--squ|--squa|--squas|--squash)
  37                 squash=--squash ;;
  38         --no-sq|--no-squ|--no-squa|--no-squas|--no-squash)
  39                 squash=--no-squash ;;
  40         --ff)
  41                 no_ff=--ff ;;
  42         --no-ff)
  43                 no_ff=--no-ff ;;
  44         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  45                 --strateg=*|--strategy=*|\
  46         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  47                 case "$#,$1" in
  48                 *,*=*)
  49                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  50                 1,*)
  51                         usage ;;
  52                 *)
  53                         strategy="$2"
  54                         shift ;;
  55                 esac
  56                 strategy_args="${strategy_args}-s $strategy "
  57                 ;;
  58         -r|--r|--re|--reb|--reba|--rebas|--rebase)
  59                 rebase=true
  60                 ;;
  61         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  62                 rebase=false
  63                 ;;
  64         -h|--h|--he|--hel|--help)
  65                 usage
  66                 ;;
  67         *)
  68                 # Pass thru anything that may be meant for fetch.
  69                 break
  70                 ;;
  71         esac
  72         shift
  73 done
  74
  75 error_on_no_merge_candidates () {
  76         exec >&2
  77         for opt
  78         do
  79                 case "$opt" in
  80                 -t|--t|--ta|--tag|--tags)
  81                         echo "Fetching tags only, you probably meant:"
  82                         echo "  git fetch --tags"
  83                         exit 1
  84                 esac
  85         done
  86
  87         curr_branch=${curr_branch#refs/heads/}
  88
  89         echo "You asked me to pull without telling me which branch you"
  90         echo "want to merge with, and 'branch.${curr_branch}.merge' in"
  91         echo "your configuration file does not tell me either.  Please"
  92         echo "name which branch you want to merge on the command line and"
  93         echo "try again (e.g. 'git pull <repository> <refspec>')."
  94         echo "See git-pull(1) for details on the refspec."
  95         echo
  96         echo "If you often merge with the same branch, you may want to"
  97         echo "configure the following variables in your configuration"
  98         echo "file:"
  99         echo
 100         echo "    branch.${curr_branch}.remote = <nickname>"
 101         echo "    branch.${curr_branch}.merge = <remote-ref>"
 102         echo "    remote.<nickname>.url = <url>"
 103         echo "    remote.<nickname>.fetch = <refspec>"
 104         echo
 105         echo "See git-config(1) for details."
 106         exit 1
 107 }
 108
 109 orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
 110 git-fetch --update-head-ok "$@" || exit 1
 111
 112 curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
 113 if test "$curr_head" != "$orig_head"
 114 then
 115         # The fetch involved updating the current branch.
 116
 117         # The working tree and the index file is still based on the
 118         # $orig_head commit, but we are merging into $curr_head.
 119         # First update the working tree to match $curr_head.
 120
 121         echo >&2 "Warning: fetch updated the current branch head."
 122         echo >&2 "Warning: fast forwarding your working tree from"
 123         echo >&2 "Warning: commit $orig_head."
 124         git update-index --refresh 2>/dev/null
 125         git read-tree -u -m "$orig_head" "$curr_head" ||
 126                 die 'Cannot fast-forward your working tree.
 127 After making sure that you saved anything precious from
 128 $ git diff '$orig_head'
 129 output, run
 130 $ git reset --hard
 131 to recover.'
 132
 133 fi
 134
 135 merge_head=$(sed -e '/  not-for-merge   /d' \
 136         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 137         tr '\012' ' ')
 138
 139 case "$merge_head" in
 140 '')
 141         case $? in
 142         0) error_on_no_merge_candidates "$@";;
 143         1) echo >&2 "You are not currently on a branch; you must explicitly"
 144            echo >&2 "specify which branch you wish to merge:"
 145            echo >&2 "  git pull <remote> <branch>"
 146            exit 1;;
 147         *) exit $?;;
 148         esac
 149         ;;
 150 ?*' '?*)
 151         if test -z "$orig_head"
 152         then
 153                 echo >&2 "Cannot merge multiple branches into empty head"
 154                 exit 1
 155         fi
 156         ;;
 157 esac
 158
 159 if test -z "$orig_head"
 160 then
 161         git update-ref -m "initial pull" HEAD $merge_head "" &&
 162         git read-tree --reset -u HEAD || exit 1
 163         exit
 164 fi
 165
 166 merge_name=$(git fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
 167 test true = "$rebase" && exec git-rebase $merge_head
 168 exec git-merge $no_summary $no_commit $squash $no_ff $strategy_args \
 169         "$merge_name" HEAD $merge_head