git-resolve.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 #
   5 # Resolve two trees.
   6 #
   7 . git-sh-setup || die "Not a git archive"
   8
   9 usage () {
  10         die "git-resolve <head> <remote> <merge-message>"
  11 }
  12
  13 dropheads() {
  14         rm -f -- "$GIT_DIR/MERGE_HEAD" \
  15                 "$GIT_DIR/LAST_MERGE" || exit 1
  16 }
  17
  18 head=$(git-rev-parse --verify "$1"^0) &&
  19 merge=$(git-rev-parse --verify "$2"^0) &&
  20 merge_msg="$3" || usage
  21
  22 #
  23 # The remote name is just used for the message,
  24 # but we do want it.
  25 #
  26 if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
  27         usage
  28 fi
  29
  30 dropheads
  31 echo $head > "$GIT_DIR"/ORIG_HEAD
  32 echo $merge > "$GIT_DIR"/LAST_MERGE
  33
  34 common=$(git-merge-base $head $merge)
  35 if [ -z "$common" ]; then
  36         die "Unable to find common commit between" $merge $head
  37 fi
  38
  39 case "$common" in
  40 "$merge")
  41         echo "Already up-to-date. Yeeah!"
  42         dropheads
  43         exit 0
  44         ;;
  45 "$head")
  46         echo "Updating from $head to $merge."
  47         git-read-tree -u -m $head $merge || exit 1
  48         git-update-ref HEAD "$merge" "$head"
  49         git-diff-tree -p $head $merge | git-apply --stat
  50         dropheads
  51         exit 0
  52         ;;
  53 esac
  54
  55 # Find an optimum merge base if there are more than one candidates.
  56 LF='
  57 '
  58 common=$(git-merge-base -a $head $merge)
  59 case "$common" in
  60 ?*"$LF"?*)
  61         echo "Trying to find the optimum merge base."
  62         G=.tmp-index$$
  63         best=
  64         best_cnt=-1
  65         for c in $common
  66         do
  67                 rm -f $G
  68                 GIT_INDEX_FILE=$G git-read-tree -m $c $head $merge \
  69                         2>/dev/null || continue
  70                 # Count the paths that are unmerged.
  71                 cnt=`GIT_INDEX_FILE=$G git-ls-files --unmerged | wc -l`
  72                 if test $best_cnt -le 0 -o $cnt -le $best_cnt
  73                 then
  74                         best=$c
  75                         best_cnt=$cnt
  76                         if test "$best_cnt" -eq 0
  77                         then
  78                                 # Cannot do any better than all trivial merge.
  79                                 break
  80                         fi
  81                 fi
  82         done
  83         rm -f $G
  84         common="$best"
  85 esac
  86
  87 echo "Trying to merge $merge into $head using $common."
  88 git-update-index --refresh 2>/dev/null
  89 git-read-tree -u -m $common $head $merge || exit 1
  90 result_tree=$(git-write-tree  2> /dev/null)
  91 if [ $? -ne 0 ]; then
  92         echo "Simple merge failed, trying Automatic merge"
  93         git-merge-index -o git-merge-one-file -a
  94         if [ $? -ne 0 ]; then
  95                 echo $merge > "$GIT_DIR"/MERGE_HEAD
  96                 die "Automatic merge failed, fix up by hand"
  97         fi
  98         result_tree=$(git-write-tree) || exit 1
  99 fi
 100 result_commit=$(echo "$merge_msg" | git-commit-tree $result_tree -p $head -p $merge)
 101 echo "Committed merge $result_commit"
 102 git-update-ref HEAD "$result_commit" "$head"
 103 git-diff-tree -p $head $result_commit | git-apply --stat
 104 dropheads