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     echo >&2 "usage: $0"' [-n] [--no-commit] [--no-summary] [--help]
  11     [-s strategy]...
  12     [<fetch-options>]
  13     <repo> <head>...
  14
  15 Fetch one or more remote refs and merge it/them into the current HEAD.
  16 '
  17     exit 1
  18 }
  19
  20 strategy_args= no_summary= no_commit=
  21 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
  22 do
  23         case "$1" in
  24         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  25                 --no-summa|--no-summar|--no-summary)
  26                 no_summary=-n ;;
  27         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  28                 no_commit=--no-commit ;;
  29         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  30                 --strateg=*|--strategy=*|\
  31         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  32                 case "$#,$1" in
  33                 *,*=*)
  34                         strategy=`expr "$1" : '-[^=]*=\(.*\)'` ;;
  35                 1,*)
  36                         usage ;;
  37                 *)
  38                         strategy="$2"
  39                         shift ;;
  40                 esac
  41                 strategy_args="${strategy_args}-s $strategy "
  42                 ;;
  43         -h|--h|--he|--hel|--help)
  44                 usage
  45                 ;;
  46         -*)
  47                 # Pass thru anything that is meant for fetch.
  48                 break
  49                 ;;
  50         esac
  51         shift
  52 done
  53
  54 orig_head=$(git-rev-parse --verify HEAD) || die "Pulling into a black hole?"
  55 git-fetch --update-head-ok "$@" || exit 1
  56
  57 curr_head=$(git-rev-parse --verify HEAD)
  58 if test "$curr_head" != "$orig_head"
  59 then
  60         # The fetch involved updating the current branch.
  61
  62         # The working tree and the index file is still based on the
  63         # $orig_head commit, but we are merging into $curr_head.
  64         # First update the working tree to match $curr_head.
  65
  66         echo >&2 "Warning: fetch updated the current branch head."
  67         echo >&2 "Warning: fast forwarding your working tree."
  68         git-read-tree -u -m "$orig_head" "$curr_head" ||
  69                 die "You need to first update your working tree."
  70 fi
  71
  72 merge_head=$(sed -e '/  not-for-merge   /d' \
  73         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
  74         tr '\012' ' ')
  75
  76 case "$merge_head" in
  77 '')
  78         echo >&2 "No changes."
  79         exit 0
  80         ;;
  81 ?*' '?*)
  82         strategy_default_args='-s octopus'
  83         ;;
  84 *)
  85         strategy_default_args='-s resolve'
  86         ;;
  87 esac
  88
  89 case "$strategy_args" in
  90 '')
  91         strategy_args=$strategy_default_args
  92         ;;
  93 esac
  94
  95 merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD")
  96 git-merge $no_summary $no_commit $strategy_args "$merge_name" HEAD $merge_head