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= no_commit=
  14 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
  15 do
  16         case "$1" in
  17         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  18                 --no-summa|--no-summar|--no-summary)
  19                 no_summary=-n ;;
  20         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  21                 no_commit=--no-commit ;;
  22         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  23                 --strateg=*|--strategy=*|\
  24         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  25                 case "$#,$1" in
  26                 *,*=*)
  27                         strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
  28                 1,*)
  29                         usage ;;
  30                 *)
  31                         strategy="$2"
  32                         shift ;;
  33                 esac
  34                 strategy_args="${strategy_args}-s $strategy "
  35                 ;;
  36         -*)
  37                 # Pass thru anything that is meant for fetch.
  38                 break
  39                 ;;
  40         esac
  41         shift
  42 done
  43
  44 orig_head=$(git-rev-parse --verify HEAD) || die "Pulling into a black hole?"
  45 git-fetch --update-head-ok "$@" || exit 1
  46
  47 curr_head=$(git-rev-parse --verify HEAD)
  48 if test "$curr_head" != "$orig_head"
  49 then
  50         # The fetch involved updating the current branch.
  51
  52         # The working tree and the index file is still based on the
  53         # $orig_head commit, but we are merging into $curr_head.
  54         # First update the working tree to match $curr_head.
  55
  56         echo >&2 "Warning: fetch updated the current branch head."
  57         echo >&2 "Warning: fast forwarding your working tree."
  58         git-read-tree -u -m "$orig_head" "$curr_head" ||
  59                 die "You need to first update your working tree."
  60 fi
  61
  62 merge_head=$(sed -e '/  not-for-merge   /d' \
  63         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
  64         tr '\012' ' ')
  65
  66 case "$merge_head" in
  67 '')
  68         echo >&2 "No changes."
  69         exit 0
  70         ;;
  71 ?*' '?*)
  72         strategy_default_args='-s octopus'
  73         ;;
  74 *)
  75         strategy_default_args='-s resolve'
  76         ;;
  77 esac
  78
  79 case "$strategy_args" in
  80 '')
  81         strategy_args=$strategy_default_args
  82         ;;
  83 esac
  84
  85 merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD")
  86 git-merge $no_summary $no_commit $strategy_args "$merge_name" HEAD $merge_head