git-merge-stupid.sh

   1 #!/bin/sh
   2 #
   3 # Copyright (c) 2005 Linus Torvalds
   4 #
   5 # Resolve two trees, 'stupid merge'.
   6
   7 # The first parameters up to -- are merge bases; the rest are heads.
   8 bases= head= remotes= sep_seen=
   9 for arg
  10 do
  11         case ",$sep_seen,$head,$arg," in
  12         *,--,)
  13                 sep_seen=yes
  14                 ;;
  15         ,yes,,*)
  16                 head=$arg
  17                 ;;
  18         ,yes,*)
  19                 remotes="$remotes$arg "
  20                 ;;
  21         *)
  22                 bases="$bases$arg "
  23                 ;;
  24         esac
  25 done
  26
  27 # Give up if we are given more than two remotes -- not handling octopus.
  28 case "$remotes" in
  29 ?*' '?*)
  30         exit 2 ;;
  31 esac
  32
  33 # Find an optimum merge base if there are more than one candidates.
  34 case "$bases" in
  35 ?*' '?*)
  36         echo "Trying to find the optimum merge base."
  37         G=.tmp-index$$
  38         best=
  39         best_cnt=-1
  40         for c in $bases
  41         do
  42                 rm -f $G
  43                 GIT_INDEX_FILE=$G git read-tree -m $c $head $remotes \
  44                          2>/dev/null || continue
  45                 # Count the paths that are unmerged.
  46                 cnt=`GIT_INDEX_FILE=$G git ls-files --unmerged | wc -l`
  47                 if test $best_cnt -le 0 -o $cnt -le $best_cnt
  48                 then
  49                         best=$c
  50                         best_cnt=$cnt
  51                         if test "$best_cnt" -eq 0
  52                         then
  53                                 # Cannot do any better than all trivial merge.
  54                                 break
  55                         fi
  56                 fi
  57         done
  58         rm -f $G
  59         common="$best"
  60         ;;
  61 *)
  62         common="$bases"
  63         ;;
  64 esac
  65
  66 git update-index --refresh 2>/dev/null
  67 git read-tree -u -m $common $head $remotes || exit 2
  68 echo "Trying simple merge."
  69 if result_tree=$(git write-tree  2>/dev/null)
  70 then
  71         exit 0
  72 else
  73         echo "Simple merge failed, trying Automatic merge."
  74         if git merge-index -o git-merge-one-file -a
  75         then
  76                 exit 0
  77         else
  78                 exit 1
  79         fi
  80 fi