git-resolve-script

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