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Custom low-level merge driver support.

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This allows users to specify custom low-level merge driver per
path, using the attributes mechanism.  Just like you can specify
one of built-in "text", "binary", "union" low-level merge
drivers by saying:

	*		merge=text
	.gitignore	merge=union
	*.jpg		merge=binary

pick a name of your favorite merge driver, and assign it as the
value of the 'merge' attribute.

A custom low-level merge driver is defined via the config
mechanism.  This patch introduces 'merge.driver', a multi-valued
configuration.  Its value is the name (i.e. the one you use as
the value of 'merge' attribute) followed by a command line
specification.  The command line can contain %O, %A, and %B to
be interpolated with the names of temporary files that hold the
common ancestor version, the version from your branch, and the
version from the other branch, and the resulting command is
spawned.

The low-level merge driver is expected to update the temporary
file for your branch (i.e. %A) with the result and exit with
status 0 for a clean merge, and non-zero status for a conflicted
merge.

A new test in t6026 demonstrates a sample usage.

Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Junio C Hamano
2007-04-17 22:51:45 -07:00
parent 47579efc00
commit f3ef6b6bbe
2 changed files with 235 additions and 13 deletions
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71
t/t6026-merge-attr.sh
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@ -30,8 +30,9 @@ test_expect_success setup '
echo Side >>$f && git add $f || break
done &&
test_tick &&
git commit -m Side
git commit -m Side &&
git tag anchor
'
test_expect_success merge '
@ -69,4 +70,72 @@ test_expect_success 'check merge result in working tree' '
'
cat >./custom-merge <<\EOF
#!/bin/sh
orig="$1" ours="$2" theirs="$3" exit="$4"
(
echo "orig is $orig"
echo "ours is $ours"
echo "theirs is $theirs"
echo "=== orig ==="
cat "$orig"
echo "=== ours ==="
cat "$ours"
echo "=== theirs ==="
cat "$theirs"
) >"$ours+"
cat "$ours+" >"$ours"
rm -f "$ours+"
exit "$exit"
EOF
chmod +x ./custom-merge
test_expect_success 'custom merge backend' '
echo "* merge=union" >.gitattributes &&
echo "text merge=custom" >>.gitattributes &&
git reset --hard anchor &&
git config --replace-all \
merge.driver "custom ./custom-merge %O %A %B 0" &&
git merge master &&
cmp binary union &&
sed -e 1,3d text >check-1 &&
o=$(git-unpack-file master^:text) &&
a=$(git-unpack-file side^:text) &&
b=$(git-unpack-file master:text) &&
sh -c "./custom-merge $o $a $b 0" &&
sed -e 1,3d $a >check-2 &&
cmp check-1 check-2 &&
rm -f $o $a $b
'
test_expect_success 'custom merge backend' '
git reset --hard anchor &&
git config --replace-all \
merge.driver "custom ./custom-merge %O %A %B 1" &&
if git merge master
then
echo "Eh? should have conflicted"
false
else
echo "Ok, conflicted"
fi &&
cmp binary union &&
sed -e 1,3d text >check-1 &&
o=$(git-unpack-file master^:text) &&
a=$(git-unpack-file anchor:text) &&
b=$(git-unpack-file master:text) &&
sh -c "./custom-merge $o $a $b 0" &&
sed -e 1,3d $a >check-2 &&
cmp check-1 check-2 &&
rm -f $o $a $b
'
test_done