user-manual: clean up fast-forward and dangling-objects sections
[git] / 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