From: Antonin Delpeuch <antonin@xxxxxxxxxxx>
Custom merge drivers need access to the names of the revisions they
are working on, so that the merge conflict markers they introduce
can refer to those revisions. The placeholders '%S', '%X' and '%Y'
are introduced to this end.
CC: Junio C Hamano <gitster@xxxxxxxxx>
Signed-off-by: Antonin Delpeuch <antonin@xxxxxxxxxxx>
---
merge-ll: expose revision names to custom drivers
Published-As: https://github.com/gitgitgadget/git/releases/tag/pr-git-1648%2Fwetneb%2Fmerge_driver_pathnames-v1
Fetch-It-Via: git fetch https://github.com/gitgitgadget/git pr-git-1648/wetneb/merge_driver_pathnames-v1
Pull-Request: https://github.com/git/git/pull/1648
Documentation/gitattributes.txt | 10 +++++++---
merge-ll.c | 17 ++++++++++++++---
t/t6406-merge-attr.sh | 16 +++++++++++-----
3 files changed, 32 insertions(+), 11 deletions(-)
diff --git a/Documentation/gitattributes.txt b/Documentation/gitattributes.txt
index 201bdf5edbd..108c2e23baa 100644
--- a/Documentation/gitattributes.txt
+++ b/Documentation/gitattributes.txt
@@ -1141,7 +1141,7 @@ command to run to merge ancestor's version (`%O`), current
version (`%A`) and the other branches' version (`%B`). These
three tokens are replaced with the names of temporary files that
hold the contents of these versions when the command line is
-built. Additionally, %L will be replaced with the conflict marker
+built. Additionally, `%L` will be replaced with the conflict marker
size (see below).
The merge driver is expected to leave the result of the merge in
@@ -1159,8 +1159,12 @@ When left unspecified, the driver itself is used for both
internal merge and the final merge.
The merge driver can learn the pathname in which the merged result
-will be stored via placeholder `%P`.
-
+will be stored via placeholder `%P`. Additionally, the names of the
+merge ancestor revision (`%S`), of the current revision (`%X`) and
+of the other branch (`%Y`) can also be supplied. Those are short
+revision names, optionally joined with the paths of the file in each
+revision. Those paths are only present if they differ and are separated
+from the revision by a colon.
`conflict-marker-size`
^^^^^^^^^^^^^^^^^^^^^^
diff --git a/merge-ll.c b/merge-ll.c
index 1df58ebaac0..ae9eb69be14 100644
--- a/merge-ll.c
+++ b/merge-ll.c
@@ -185,9 +185,9 @@ static void create_temp(mmfile_t *src, char *path, size_t len)
static enum ll_merge_result ll_ext_merge(const struct ll_merge_driver *fn,
mmbuffer_t *result,
const char *path,
- mmfile_t *orig, const char *orig_name UNUSED,
- mmfile_t *src1, const char *name1 UNUSED,
- mmfile_t *src2, const char *name2 UNUSED,
+ mmfile_t *orig, const char *orig_name,
+ mmfile_t *src1, const char *name1,
+ mmfile_t *src2, const char *name2,
const struct ll_merge_options *opts,
int marker_size)
{
@@ -222,6 +222,12 @@ static enum ll_merge_result ll_ext_merge(const struct ll_merge_driver *fn,
strbuf_addf(&cmd, "%d", marker_size);
else if (skip_prefix(format, "P", &format))
sq_quote_buf(&cmd, path);
+ else if (skip_prefix(format, "S", &format))
+ sq_quote_buf(&cmd, orig_name);
+ else if (skip_prefix(format, "X", &format))
+ sq_quote_buf(&cmd, name1);
+ else if (skip_prefix(format, "Y", &format))
+ sq_quote_buf(&cmd, name2);
else
strbuf_addch(&cmd, '%');
}
@@ -315,7 +321,12 @@ static int read_merge_config(const char *var, const char *value,
* %B - temporary file name for the other branches' version.
* %L - conflict marker length
* %P - the original path (safely quoted for the shell)
+ * %S - the revision for the merge base
+ * %X - the revision for our version
+ * %Y - the revision for their version
*
+ * If the file is not named indentically in all versions, then each
+ * revision is joined with the corresponding path, separated by a colon.
* The external merge driver should write the results in the
* file named by %A, and signal that it has done with zero exit
* status.
diff --git a/t/t6406-merge-attr.sh b/t/t6406-merge-attr.sh
index 72f8c1722ff..156a1efacfe 100755
--- a/t/t6406-merge-attr.sh
+++ b/t/t6406-merge-attr.sh
@@ -42,11 +42,15 @@ test_expect_success setup '
#!/bin/sh
orig="$1" ours="$2" theirs="$3" exit="$4" path=$5
+ orig_name="$6" our_name="$7" their_name="$8"
(
echo "orig is $orig"
echo "ours is $ours"
echo "theirs is $theirs"
echo "path is $path"
+ echo "orig_name is $orig_name"
+ echo "our_name is $our_name"
+ echo "their_name is $their_name"
echo "=== orig ==="
cat "$orig"
echo "=== ours ==="
@@ -121,7 +125,7 @@ test_expect_success 'custom merge backend' '
git reset --hard anchor &&
git config --replace-all \
- merge.custom.driver "./custom-merge %O %A %B 0 %P" &&
+ merge.custom.driver "./custom-merge %O %A %B 0 %P %S %X %Y" &&
git config --replace-all \
merge.custom.name "custom merge driver for testing" &&
@@ -132,7 +136,8 @@ test_expect_success 'custom merge backend' '
o=$(git unpack-file main^:text) &&
a=$(git unpack-file side^:text) &&
b=$(git unpack-file main:text) &&
- sh -c "./custom-merge $o $a $b 0 text" &&
+ base_revid=$(git rev-parse --short main^) &&
+ sh -c "./custom-merge $o $a $b 0 text $base_revid HEAD main" &&
sed -e 1,3d $a >check-2 &&
cmp check-1 check-2 &&
rm -f $o $a $b
@@ -142,7 +147,7 @@ test_expect_success 'custom merge backend' '
git reset --hard anchor &&
git config --replace-all \
- merge.custom.driver "./custom-merge %O %A %B 1 %P" &&
+ merge.custom.driver "./custom-merge %O %A %B 1 %P %S %X %Y" &&
git config --replace-all \
merge.custom.name "custom merge driver for testing" &&
@@ -159,7 +164,8 @@ test_expect_success 'custom merge backend' '
o=$(git unpack-file main^:text) &&
a=$(git unpack-file anchor:text) &&
b=$(git unpack-file main:text) &&
- sh -c "./custom-merge $o $a $b 0 text" &&
+ base_revid=$(git rev-parse --short main^) &&
+ sh -c "./custom-merge $o $a $b 0 text $base_revid HEAD main" &&
sed -e 1,3d $a >check-2 &&
cmp check-1 check-2 &&
sed -e 1,3d -e 4q $a >check-3 &&
@@ -173,7 +179,7 @@ test_expect_success !WINDOWS 'custom merge driver that is killed with a signal'
git reset --hard anchor &&
git config --replace-all \
- merge.custom.driver "./custom-merge %O %A %B 0 %P" &&
+ merge.custom.driver "./custom-merge %O %A %B 0 %P %S %X %Y" &&
git config --replace-all \
merge.custom.name "custom merge driver for testing" &&
base-commit: 186b115d3062e6230ee296d1ddaa0c4b72a464b5
--
gitgitgadget
