Andrew's git - gitweb.git/blob - contrib/examples/git-resolve.sh

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Linus Torvalds
   4#
   5# Resolve two trees.
   6#
   7
   8echo 'WARNING: This command is DEPRECATED and will be removed very soon.' >&2
   9echo 'WARNING: Please use git-merge or git-pull instead.' >&2
  10sleep 2
  11
  12USAGE='<head> <remote> <merge-message>'
  13. git-sh-setup
  14
  15dropheads() {
  16        rm -f -- "$GIT_DIR/MERGE_HEAD" \
  17                "$GIT_DIR/LAST_MERGE" || exit 1
  18}
  19
  20head=$(git rev-parse --verify "$1"^0) &&
  21merge=$(git rev-parse --verify "$2"^0) &&
  22merge_name="$2" &&
  23merge_msg="$3" || usage
  24
  25#
  26# The remote name is just used for the message,
  27# but we do want it.
  28#
  29if [ -z "$head" -o -z "$merge" -o -z "$merge_msg" ]; then
  30        usage
  31fi
  32
  33dropheads
  34echo $head > "$GIT_DIR"/ORIG_HEAD
  35echo $merge > "$GIT_DIR"/LAST_MERGE
  36
  37common=$(git merge-base $head $merge)
  38if [ -z "$common" ]; then
  39        die "Unable to find common commit between" $merge $head
  40fi
  41
  42case "$common" in
  43"$merge")
  44        echo "Already up to date. Yeeah!"
  45        dropheads
  46        exit 0
  47        ;;
  48"$head")
  49        echo "Updating $(git rev-parse --short $head)..$(git rev-parse --short $merge)"
  50        git read-tree -u -m $head $merge || exit 1
  51        git update-ref -m "resolve $merge_name: Fast-forward" \
  52                HEAD "$merge" "$head"
  53        git diff-tree -p $head $merge | git apply --stat
  54        dropheads
  55        exit 0
  56        ;;
  57esac
  58
  59# We are going to make a new commit.
  60git var GIT_COMMITTER_IDENT >/dev/null || exit
  61
  62# Find an optimum merge base if there are more than one candidates.
  63LF='
  64'
  65common=$(git merge-base -a $head $merge)
  66case "$common" in
  67?*"$LF"?*)
  68        echo "Trying to find the optimum merge base."
  69        G=.tmp-index$$
  70        best=
  71        best_cnt=-1
  72        for c in $common
  73        do
  74                rm -f $G
  75                GIT_INDEX_FILE=$G git read-tree -m $c $head $merge \
  76                        2>/dev/null || continue
  77                # Count the paths that are unmerged.
  78                cnt=$(GIT_INDEX_FILE=$G git ls-files --unmerged | wc -l)
  79                if test $best_cnt -le 0 || test $cnt -le $best_cnt
  80                then
  81                        best=$c
  82                        best_cnt=$cnt
  83                        if test "$best_cnt" -eq 0
  84                        then
  85                                # Cannot do any better than all trivial merge.
  86                                break
  87                        fi
  88                fi
  89        done
  90        rm -f $G
  91        common="$best"
  92esac
  93
  94echo "Trying to merge $merge into $head using $common."
  95git update-index --refresh 2>/dev/null
  96git read-tree -u -m $common $head $merge || exit 1
  97result_tree=$(git write-tree  2> /dev/null)
  98if [ $? -ne 0 ]; then
  99        echo "Simple merge failed, trying Automatic merge"
 100        git-merge-index -o git-merge-one-file -a
 101        if [ $? -ne 0 ]; then
 102                echo $merge > "$GIT_DIR"/MERGE_HEAD
 103                die "Automatic merge failed, fix up by hand"
 104        fi
 105        result_tree=$(git write-tree) || exit 1
 106fi
 107result_commit=$(echo "$merge_msg" | git commit-tree $result_tree -p $head -p $merge)
 108echo "Committed merge $result_commit"
 109git update-ref -m "resolve $merge_name: In-index merge" \
 110        HEAD "$result_commit" "$head"
 111git diff-tree -p $head $result_commit | git apply --stat
 112dropheads