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#!/bin/sh
#
# Copyright (c) 2005 Junio C Hamano
#
# Resolve two or more trees.
#
. git-sh-setup
LF='
'
# 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 "$remotes" in
?*' '?*)
;;
*)
exit 2 ;;
esac
# MRC is the current "merge reference commit"
# MRT is the current "merge result tree"
if ! git diff-index --quiet --cached HEAD --
then
gettextln "Error: Your local changes to the following files would be overwritten by merge"
git diff-index --cached --name-only HEAD -- | sed -e 's/^/ /'
exit 2
fi
MRC=$(git rev-parse --verify -q $head)
MRT=$(git write-tree)
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.
gettextln "Automated merge did not work."
gettextln "Should not be doing an octopus."
exit 2
esac
eval pretty_name=\${GITHEAD_$SHA1:-$SHA1}
if test "$SHA1" = "$pretty_name"
then
SHA1_UP="$(echo "$SHA1" | tr a-z A-Z)"
eval pretty_name=\${GITHEAD_$SHA1_UP:-$pretty_name}
fi
common=$(git merge-base --all $SHA1 $MRC) ||
die "$(eval_gettext "Unable to find common commit with \$pretty_name")"
case "$LF$common$LF" in
*"$LF$SHA1$LF"*)
eval_gettextln "Already up to date with \$pretty_name"
continue
;;
esac
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.
eval_gettextln "Fast-forwarding to: \$pretty_name"
git read-tree -u -m $head $SHA1 || exit
MRC=$SHA1 MRT=$(git write-tree)
continue
fi
NON_FF_MERGE=1
eval_gettextln "Trying simple merge with \$pretty_name"
git read-tree -u -m --aggressive $common $MRT $SHA1 || exit 2
next=$(git write-tree 2>/dev/null)
if test $? -ne 0
then
gettextln "Simple merge did not work, trying automatic merge."
git merge-index -o git-merge-one-file -a ||
OCTOPUS_FAILURE=1
next=$(git write-tree 2>/dev/null)
fi
MRC="$MRC $SHA1"
MRT=$next
done
exit "$OCTOPUS_FAILURE"
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