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 $strategy "
  57                 ;;
  58         -r|--r|--re|--reb|--reba|--rebas|--rebase)
  59                 rebase=true
  60                 ;;
  61         --no-r|--no-re|--no-reb|--no-reba|--no-rebas|--no-rebase)
  62                 rebase=false
  63                 ;;
  64         -h|--h|--he|--hel|--help)
  65                 usage
  66                 ;;
  67         *)
  68                 # Pass thru anything that may be meant for fetch.
  69                 break
  70                 ;;
  71         esac
  72         shift
  73 done
  74
  75 orig_head=$(git rev-parse --verify HEAD 2>/dev/null)
  76 git-fetch --update-head-ok "$@" || exit 1
  77
  78 curr_head=$(git rev-parse --verify HEAD 2>/dev/null)
  79 if test "$curr_head" != "$orig_head"
  80 then
  81         # The fetch involved updating the current branch.
  82
  83         # The working tree and the index file is still based on the
  84         # $orig_head commit, but we are merging into $curr_head.
  85         # First update the working tree to match $curr_head.
  86
  87         echo >&2 "Warning: fetch updated the current branch head."
  88         echo >&2 "Warning: fast forwarding your working tree from"
  89         echo >&2 "Warning: commit $orig_head."
  90         git update-index --refresh 2>/dev/null
  91         git read-tree -u -m "$orig_head" "$curr_head" ||
  92                 die 'Cannot fast-forward your working tree.
  93 After making sure that you saved anything precious from
  94 $ git diff '$orig_head'
  95 output, run
  96 $ git reset --hard
  97 to recover.'
  98
  99 fi
 100
 101 merge_head=$(sed -e '/  not-for-merge   /d' \
 102         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
 103         tr '\012' ' ')
 104
 105 case "$merge_head" in
 106 '')
 107         case $? in
 108           0) ;;
 109           1) echo >&2 "You are not currently on a branch; you must explicitly"
 110              echo >&2 "specify which branch you wish to merge:"
 111              echo >&2 "  git pull <remote> <branch>"
 112              exit 1;;
 113           *) exit $?;;
 114         esac
 115         curr_branch=${curr_branch#refs/heads/}
 116
 117         echo >&2 "You asked me to pull without telling me which branch you"
 118         echo >&2 "want to merge with, and 'branch.${curr_branch}.merge' in"
 119         echo >&2 "your configuration file does not tell me either.  Please"
 120         echo >&2 "name which branch you want to merge on the command line and"
 121         echo >&2 "try again (e.g. 'git pull <repository> <refspec>')."
 122         echo >&2 "See git-pull(1) for details on the refspec."
 123         echo >&2
 124         echo >&2 "If you often merge with the same branch, you may want to"
 125         echo >&2 "configure the following variables in your configuration"
 126         echo >&2 "file:"
 127         echo >&2
 128         echo >&2 "    branch.${curr_branch}.remote = <nickname>"
 129         echo >&2 "    branch.${curr_branch}.merge = <remote-ref>"
 130         echo >&2 "    remote.<nickname>.url = <url>"
 131         echo >&2 "    remote.<nickname>.fetch = <refspec>"
 132         echo >&2
 133         echo >&2 "See git-config(1) for details."
 134         exit 1
 135         ;;
 136 ?*' '?*)
 137         if test -z "$orig_head"
 138         then
 139                 echo >&2 "Cannot merge multiple branches into empty head"
 140                 exit 1
 141         fi
 142         ;;
 143 esac
 144
 145 if test -z "$orig_head"
 146 then
 147         git update-ref -m "initial pull" HEAD $merge_head "" &&
 148         git read-tree --reset -u HEAD || exit 1
 149         exit
 150 fi
 151
 152 merge_name=$(git fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
 153 test true = "$rebase" && exec git-rebase $merge_head
 154 exec git-merge $no_summary $no_commit $squash $no_ff $strategy_args \
 155         "$merge_name" HEAD $merge_head