clone-pack: use create_symref() instead of raw symlink.
[git] / git-merge-octopus.sh
1 #!/bin/sh
2 #
3 # Copyright (c) 2005 Junio C Hamano
4 #
5 # Resolve two or more trees.
6 #
7
8 # The first parameters up to -- are merge bases; the rest are heads.
9 bases= head= remotes= sep_seen=
10 for arg
11 do
12         case ",$sep_seen,$head,$arg," in
13         *,--,)
14                 sep_seen=yes
15                 ;;
16         ,yes,,*)
17                 head=$arg
18                 ;;
19         ,yes,*)
20                 remotes="$remotes$arg "
21                 ;;
22         *)
23                 bases="$bases$arg "
24                 ;;
25         esac
26 done
27
28 # Reject if this is not an Octopus -- resolve should be used instead.
29 case "$remotes" in
30 ?*' '?*)
31         ;;
32 *)
33         exit 2 ;;
34 esac
35
36 # MRC is the current "merge reference commit"
37 # MRT is the current "merge result tree"
38
39 MRC=$head MSG= PARENT="-p $head"
40 MRT=$(git-write-tree)
41 CNT=1 ;# counting our head
42 NON_FF_MERGE=0
43 for SHA1 in $remotes
44 do
45         common=$(git-merge-base $MRC $SHA1) ||
46                 die "Unable to find common commit with $SHA1"
47
48         if test "$common" = $SHA1
49         then
50                 echo "Already up-to-date with $SHA1"
51                 continue
52         fi
53
54         CNT=`expr $CNT + 1`
55         PARENT="$PARENT -p $SHA1"
56
57         if test "$common,$NON_FF_MERGE" = "$MRC,0"
58         then
59                 # The first head being merged was a fast-forward.
60                 # Advance MRC to the head being merged, and use that
61                 # tree as the intermediate result of the merge.
62                 # We still need to count this as part of the parent set.
63
64                 echo "Fast forwarding to: $SHA1"
65                 git-read-tree -u -m $head $SHA1 || exit
66                 MRC=$SHA1 MRT=$(git-write-tree)
67                 continue
68         fi
69
70         NON_FF_MERGE=1
71
72         echo "Trying simple merge with $SHA1"
73         git-read-tree -u -m $common $MRT $SHA1 || exit 2
74         next=$(git-write-tree 2>/dev/null)
75         if test $? -ne 0
76         then
77                 echo "Simple merge did not work, trying automatic merge."
78                 git-merge-index -o git-merge-one-file -a ||
79                 exit 2 ; # Automatic merge failed; should not be doing Octopus
80                 next=$(git-write-tree 2>/dev/null)
81         fi
82         MRC=$common
83         MRT=$next
84 done
85
86 exit 0