Andrew's git - gitweb.git/blob - git-merge-octopus.sh

   1#!/bin/sh
   2#
   3# Copyright (c) 2005 Junio C Hamano
   4#
   5# Resolve two or more trees.
   6#
   7
   8LF='
   9'
  10
  11die () {
  12    echo >&2 "$*"
  13    exit 1
  14}
  15
  16# The first parameters up to -- are merge bases; the rest are heads.
  17bases= head= remotes= sep_seen=
  18for arg
  19do
  20        case ",$sep_seen,$head,$arg," in
  21        *,--,)
  22                sep_seen=yes
  23                ;;
  24        ,yes,,*)
  25                head=$arg
  26                ;;
  27        ,yes,*)
  28                remotes="$remotes$arg "
  29                ;;
  30        *)
  31                bases="$bases$arg "
  32                ;;
  33        esac
  34done
  35
  36# Reject if this is not an Octopus -- resolve should be used instead.
  37case "$remotes" in
  38?*' '?*)
  39        ;;
  40*)
  41        exit 2 ;;
  42esac
  43
  44# MRC is the current "merge reference commit"
  45# MRT is the current "merge result tree"
  46
  47MRC=$(git rev-parse --verify -q $head) MSG= PARENT="-p $head"
  48MRT=$(git write-tree)
  49CNT=1 ;# counting our head
  50NON_FF_MERGE=0
  51OCTOPUS_FAILURE=0
  52for SHA1 in $remotes
  53do
  54        case "$OCTOPUS_FAILURE" in
  55        1)
  56                # We allow only last one to have a hand-resolvable
  57                # conflicts.  Last round failed and we still had
  58                # a head to merge.
  59                echo "Automated merge did not work."
  60                echo "Should not be doing an Octopus."
  61                exit 2
  62        esac
  63
  64        eval pretty_name=\${GITHEAD_$SHA1:-$SHA1}
  65        common=$(git merge-base --all $SHA1 $MRC) ||
  66                die "Unable to find common commit with $pretty_name"
  67
  68        case "$LF$common$LF" in
  69        *"$LF$SHA1$LF"*)
  70                echo "Already up-to-date with $pretty_name"
  71                continue
  72                ;;
  73        esac
  74
  75        CNT=`expr $CNT + 1`
  76        PARENT="$PARENT -p $SHA1"
  77
  78        if test "$common,$NON_FF_MERGE" = "$MRC,0"
  79        then
  80                # The first head being merged was a fast-forward.
  81                # Advance MRC to the head being merged, and use that
  82                # tree as the intermediate result of the merge.
  83                # We still need to count this as part of the parent set.
  84
  85                echo "Fast-forwarding to: $pretty_name"
  86                git read-tree -u -m $head $SHA1 || exit
  87                MRC=$SHA1 MRT=$(git write-tree)
  88                continue
  89        fi
  90
  91        NON_FF_MERGE=1
  92
  93        echo "Trying simple merge with $pretty_name"
  94        git read-tree -u -m --aggressive  $common $MRT $SHA1 || exit 2
  95        next=$(git write-tree 2>/dev/null)
  96        if test $? -ne 0
  97        then
  98                echo "Simple merge did not work, trying automatic merge."
  99                git-merge-index -o git-merge-one-file -a ||
 100                OCTOPUS_FAILURE=1
 101                next=$(git write-tree 2>/dev/null)
 102        fi
 103
 104        MRC="$MRC $SHA1"
 105        MRT=$next
 106done
 107
 108exit "$OCTOPUS_FAILURE"