107 lines
2.1 KiB
Bash
Executable File
107 lines
2.1 KiB
Bash
Executable File
#!/bin/sh
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#
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# Copyright (c) 2005 Junio C Hamano
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#
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# Resolve two or more trees.
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#
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LF='
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'
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die () {
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echo >&2 "$*"
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exit 1
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}
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# The first parameters up to -- are merge bases; the rest are heads.
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bases= head= remotes= sep_seen=
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for arg
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do
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case ",$sep_seen,$head,$arg," in
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*,--,)
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sep_seen=yes
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;;
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,yes,,*)
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head=$arg
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;;
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,yes,*)
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remotes="$remotes$arg "
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;;
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*)
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bases="$bases$arg "
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;;
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esac
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done
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# Reject if this is not an Octopus -- resolve should be used instead.
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case "$remotes" in
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?*' '?*)
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;;
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*)
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exit 2 ;;
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esac
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# MRC is the current "merge reference commit"
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# MRT is the current "merge result tree"
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MRC=$head MSG= PARENT="-p $head"
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MRT=$(git-write-tree)
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CNT=1 ;# counting our head
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NON_FF_MERGE=0
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for SHA1 in $remotes
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do
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common=$(git-merge-base --all $MRC $SHA1) ||
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die "Unable to find common commit with $SHA1"
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case "$common" in
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?*"$LF"?*)
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die "Not trivially mergeable."
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;;
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$SHA1)
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echo "Already up-to-date with $SHA1"
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continue
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;;
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esac
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CNT=`expr $CNT + 1`
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PARENT="$PARENT -p $SHA1"
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if test "$common,$NON_FF_MERGE" = "$MRC,0"
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then
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# The first head being merged was a fast-forward.
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# Advance MRC to the head being merged, and use that
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# tree as the intermediate result of the merge.
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# We still need to count this as part of the parent set.
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echo "Fast forwarding to: $SHA1"
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git-read-tree -u -m $head $SHA1 || exit
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MRC=$SHA1 MRT=$(git-write-tree)
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continue
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fi
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NON_FF_MERGE=1
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echo "Trying simple merge with $SHA1"
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git-read-tree -u -m $common $MRT $SHA1 || exit 2
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next=$(git-write-tree 2>/dev/null)
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if test $? -ne 0
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then
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echo "Simple merge did not work, trying automatic merge."
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git-merge-index -o git-merge-one-file -a ||
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exit 2 ; # Automatic merge failed; should not be doing Octopus
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next=$(git-write-tree 2>/dev/null)
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fi
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# We have merged the other branch successfully. Ideally
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# we could implement OR'ed heads in merge-base, and keep
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# a list of commits we have merged so far in MRC to feed
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# them to merge-base, but we approximate it by keep using
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# the current MRC. We used to update it to $common, which
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# was incorrectly doing AND'ed merge-base here, which was
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# unneeded.
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MRT=$next
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done
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exit 0
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