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 . git-sh-setup || die "Not a git archive"
   8
   9 usage () {
  10     die "git pull [-n] [-s strategy]... <repo> <head>..."
  11 }
  12
  13 strategy_args= no_summary=
  14 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
  15 do
  16         case "$1" in
  17         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  18                 --no-summa|--no-summar|--no-summary)
  19                 no_summary=-n ;;
  20         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  21                 --strateg=*|--strategy=*|\
  22         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  23                 case "$#,$1" in
  24                 *,*=*)
  25                         strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
  26                 1,*)
  27                         usage ;;
  28                 *)
  29                         strategy="$2"
  30                         shift ;;
  31                 esac
  32                 strategy_args="${strategy_args}-s $strategy "
  33                 ;;
  34         -*)
  35                 usage
  36                 ;;
  37         esac
  38         shift
  39 done
  40
  41 orig_head=$(cat "$GIT_DIR/HEAD") || die "Pulling into a black hole?"
  42 git-fetch --update-head-ok "$@" || exit 1
  43
  44 curr_head=$(cat "$GIT_DIR/HEAD")
  45 if test "$curr_head" != "$orig_head"
  46 then
  47         # The fetch involved updating the current branch.
  48
  49         # The working tree and the index file is still based on the
  50         # $orig_head commit, but we are merging into $curr_head.
  51         # First update the working tree to match $curr_head.
  52
  53         echo >&2 "Warning: fetch updated the current branch head."
  54         echo >&2 "Warning: fast forwarding your working tree."
  55         git-read-tree -u -m "$orig_head" "$curr_head" ||
  56                 die "You need to first update your working tree."
  57 fi
  58
  59 merge_head=$(sed -e 's/ .*//' "$GIT_DIR"/FETCH_HEAD | tr '\012' ' ')
  60 merge_name=$(
  61     perl -e 'print join("; ", map { chomp; s/^[0-9a-f]* //; $_ } <>)' \
  62     "$GIT_DIR"/FETCH_HEAD
  63 )
  64
  65 case "$merge_head" in
  66 '')
  67         echo >&2 "No changes."
  68         exit 0
  69         ;;
  70 esac
  71
  72 git-merge $no_summary $strategy_args "Merge $merge_name" HEAD $merge_head