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tag: v1.5.6-rc1
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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
# Resolve two or more trees.
#

LF='
'

die () {
    echo >&2 "$*"
    exit 1
}

# The first parameters up to -- are merge bases; the rest are heads.
bases= head= remotes= sep_seen=
for arg
do
case ",$sep_seen,$head,$arg," in
*,--,)
sep_seen=yes
;;
,yes,,*)
head=$arg
;;
,yes,*)
remotes="$remotes$arg "
;;
*)
bases="$bases$arg "
;;
esac
done

# Reject if this is not an Octopus -- resolve should be used instead.
case "$remotes" in
?*' '?*)
;;
*)
exit 2 ;;
esac

# MRC is the current "merge reference commit"
# MRT is the current "merge result tree"

MRC=$head MSG= PARENT="-p $head"
MRT=$(git write-tree)
CNT=1 ;# counting our head
NON_FF_MERGE=0
OCTOPUS_FAILURE=0
for SHA1 in $remotes
do
case "$OCTOPUS_FAILURE" in
1)
# We allow only last one to have a hand-resolvable
# conflicts. Last round failed and we still had
# a head to merge.
echo "Automated merge did not work."
echo "Should not be doing an Octopus."
exit 2
esac

common=$(git merge-base --all $MRC $SHA1) ||
die "Unable to find common commit with $SHA1"

case "$LF$common$LF" in
*"$LF$SHA1$LF"*)
echo "Already up-to-date with $SHA1"
continue
;;
esac

CNT=`expr $CNT + 1`
PARENT="$PARENT -p $SHA1"

if test "$common,$NON_FF_MERGE" = "$MRC,0"
then
# The first head being merged was a fast-forward.
# Advance MRC to the head being merged, and use that
# tree as the intermediate result of the merge.
# We still need to count this as part of the parent set.

echo "Fast forwarding to: $SHA1"
git read-tree -u -m $head $SHA1 || exit
MRC=$SHA1 MRT=$(git write-tree)
continue
fi

NON_FF_MERGE=1

echo "Trying simple merge with $SHA1"
git read-tree -u -m --aggressive $common $MRT $SHA1 || exit 2
next=$(git write-tree 2>/dev/null)
if test $? -ne 0
then
echo "Simple merge did not work, trying automatic merge."
git-merge-index -o git-merge-one-file -a ||
OCTOPUS_FAILURE=1
next=$(git write-tree 2>/dev/null)
fi

# We have merged the other branch successfully. Ideally
# we could implement OR'ed heads in merge-base, and keep
# a list of commits we have merged so far in MRC to feed
# them to merge-base, but we approximate it by keep using
# the current MRC. We used to update it to $common, which
# was incorrectly doing AND'ed merge-base here, which was
# unneeded.

MRT=$next
done

exit "$OCTOPUS_FAILURE"
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