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] [-s strategy]... [<fetch-options>] <repo> <head>...'
   8 LONG_USAGE='Fetch one or more remote refs and merge it/them into the current HEAD.'
   9 . git-sh-setup
  10 set_reflog_action "pull $*"
  11
  12 strategy_args= no_summary= no_commit= squash=
  13 while case "$#,$1" in 0) break ;; *,-*) ;; *) break ;; esac
  14 do
  15         case "$1" in
  16         -n|--n|--no|--no-|--no-s|--no-su|--no-sum|--no-summ|\
  17                 --no-summa|--no-summar|--no-summary)
  18                 no_summary=-n ;;
  19         --no-c|--no-co|--no-com|--no-comm|--no-commi|--no-commit)
  20                 no_commit=--no-commit ;;
  21         --sq|--squ|--squa|--squas|--squash)
  22                 squash=--squash ;;
  23         -s=*|--s=*|--st=*|--str=*|--stra=*|--strat=*|--strate=*|\
  24                 --strateg=*|--strategy=*|\
  25         -s|--s|--st|--str|--stra|--strat|--strate|--strateg|--strategy)
  26                 case "$#,$1" in
  27                 *,*=*)
  28                         strategy=`expr "z$1" : 'z-[^=]*=\(.*\)'` ;;
  29                 1,*)
  30                         usage ;;
  31                 *)
  32                         strategy="$2"
  33                         shift ;;
  34                 esac
  35                 strategy_args="${strategy_args}-s $strategy "
  36                 ;;
  37         -h|--h|--he|--hel|--help)
  38                 usage
  39                 ;;
  40         -*)
  41                 # Pass thru anything that is meant for fetch.
  42                 break
  43                 ;;
  44         esac
  45         shift
  46 done
  47
  48 orig_head=$(git-rev-parse --verify HEAD 2>/dev/null)
  49 git-fetch --update-head-ok "$@" || exit 1
  50
  51 curr_head=$(git-rev-parse --verify HEAD 2>/dev/null)
  52 if test "$curr_head" != "$orig_head"
  53 then
  54         # The fetch involved updating the current branch.
  55
  56         # The working tree and the index file is still based on the
  57         # $orig_head commit, but we are merging into $curr_head.
  58         # First update the working tree to match $curr_head.
  59
  60         echo >&2 "Warning: fetch updated the current branch head."
  61         echo >&2 "Warning: fast forwarding your working tree from"
  62         echo >&2 "Warning: commit $orig_head."
  63         git-update-index --refresh 2>/dev/null
  64         git-read-tree -u -m "$orig_head" "$curr_head" ||
  65                 die 'Cannot fast-forward your working tree.
  66 After making sure that you saved anything precious from
  67 $ git diff '$orig_head'
  68 output, run
  69 $ git reset --hard
  70 to recover.'
  71
  72 fi
  73
  74 merge_head=$(sed -e '/  not-for-merge   /d' \
  75         -e 's/  .*//' "$GIT_DIR"/FETCH_HEAD | \
  76         tr '\012' ' ')
  77
  78 case "$merge_head" in
  79 '')
  80         curr_branch=$(git-symbolic-ref HEAD | \
  81                 sed -e 's|^refs/heads/||')
  82         echo >&2 "Warning: No merge candidate found because value of config option
  83          \"branch.${curr_branch}.merge\" does not match any remote branch fetched."
  84         echo >&2 "No changes."
  85         exit 0
  86         ;;
  87 ?*' '?*)
  88         if test -z "$orig_head"
  89         then
  90                 echo >&2 "Cannot merge multiple branches into empty head"
  91                 exit 1
  92         fi
  93         var=`git-repo-config --get pull.octopus`
  94         if test -n "$var"
  95         then
  96                 strategy_default_args="-s $var"
  97         fi
  98         ;;
  99 *)
 100         var=`git-repo-config --get pull.twohead`
 101         if test -n "$var"
 102         then
 103                 strategy_default_args="-s $var"
 104         fi
 105         ;;
 106 esac
 107
 108 if test -z "$orig_head"
 109 then
 110         git-update-ref -m "initial pull" HEAD $merge_head "" &&
 111         git-read-tree --reset -u HEAD || exit 1
 112         exit
 113 fi
 114
 115 case "$strategy_args" in
 116 '')
 117         strategy_args=$strategy_default_args
 118         ;;
 119 esac
 120
 121 merge_name=$(git-fmt-merge-msg <"$GIT_DIR/FETCH_HEAD") || exit
 122 exec git-merge $no_summary $no_commit $squash $strategy_args \
 123         "$merge_name" HEAD $merge_head