From: Victoria Dye <vdye@xxxxxxxxxx>
In most builtins ('rev-parse <revision>^{}', 'show-ref --dereference'),
"dereferencing" a tag refers to a recursive peel of the tag object. Unlike
these cases, the dereferencing prefix ('*') in 'for-each-ref' format
specifiers triggers only a single, non-recursive dereference of a given tag
object. For most annotated tags, a single dereference is all that is needed
to access the tag's associated commit or tree; "recursive" and
"non-recursive" dereferencing are functionally equivalent in these cases.
However, nested tags (annotated tags whose target is another annotated tag)
dereferenced once return another tag, where a recursive dereference would
return the commit or tree.
Currently, if a user wants to filter & format refs and include information
about a recursively-dereferenced tag, they can do so with something like
'cat-file --batch-check':
git for-each-ref --format="%(objectname)^{} %(refname)" <pattern> |
git cat-file --batch-check="%(objectname) %(rest)"
But the combination of commands is inefficient. So, to improve the
performance of this use case and align the defererencing behavior of
'for-each-ref' with that of other commands, update the ref formatting code
to use the peeled tag (from 'peel_iterated_oid()') to populate '*' fields
rather than the tag's immediate target object (from 'get_tagged_oid()').
Additionally, add a test to 't6300-for-each-ref' to verify new nested tag
behavior and update 't6302-for-each-ref-filter.sh' to print the correct
value for nested dereferenced fields.
Signed-off-by: Victoria Dye <vdye@xxxxxxxxxx>
---
Documentation/git-for-each-ref.txt | 4 ++--
ref-filter.c | 13 ++++---------
t/t6300-for-each-ref.sh | 22 ++++++++++++++++++++++
t/t6302-for-each-ref-filter.sh | 4 ++--
4 files changed, 30 insertions(+), 13 deletions(-)
diff --git a/Documentation/git-for-each-ref.txt b/Documentation/git-for-each-ref.txt
index b136c9fa908..be9543f6840 100644
--- a/Documentation/git-for-each-ref.txt
+++ b/Documentation/git-for-each-ref.txt
@@ -296,8 +296,8 @@ from the `committer` or `tagger` fields depending on the object type.
These are intended for working on a mix of annotated and lightweight tags.
For tag objects, a `fieldname` prefixed with an asterisk (`*`) expands to
-the `fieldname` value of object the tag points at, rather than that of the
-tag object itself.
+the `fieldname` value of the peeled object, rather than that of the tag
+object itself.
Fields that have name-email-date tuple as its value (`author`,
`committer`, and `tagger`) can be suffixed with `name`, `email`,
diff --git a/ref-filter.c b/ref-filter.c
index 48453db24f7..fdaabb5bb45 100644
--- a/ref-filter.c
+++ b/ref-filter.c
@@ -2508,17 +2508,12 @@ static int populate_value(struct ref_array_item *ref, struct strbuf *err)
return 0;
/*
- * If it is a tag object, see if we use a value that derefs
- * the object, and if we do grab the object it refers to.
+ * If it is a tag object, see if we use the peeled value. If we do,
+ * grab the peeled OID.
*/
- oi_deref.oid = *get_tagged_oid((struct tag *)obj);
+ if (need_tagged && peel_iterated_oid(&obj->oid, &oi_deref.oid))
+ die("bad tag");
- /*
- * NEEDSWORK: This derefs tag only once, which
- * is good to deal with chains of trust, but
- * is not consistent with what deref_tag() does
- * which peels the onion to the core.
- */
return get_object(ref, 1, &obj, &oi_deref, err);
}
diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index 0613e5e3623..54e22812598 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh
@@ -1839,6 +1839,28 @@ test_expect_success 'git for-each-ref with non-existing refs' '
test_must_be_empty actual
'
+test_expect_success 'git for-each-ref with nested tags' '
+ git tag -am "Normal tag" nested/base HEAD &&
+ git tag -am "Nested tag" nested/nest1 refs/tags/nested/base &&
+ git tag -am "Double nested tag" nested/nest2 refs/tags/nested/nest1 &&
+
+ head_oid="$(git rev-parse HEAD)" &&
+ base_tag_oid="$(git rev-parse refs/tags/nested/base)" &&
+ nest1_tag_oid="$(git rev-parse refs/tags/nested/nest1)" &&
+ nest2_tag_oid="$(git rev-parse refs/tags/nested/nest2)" &&
+
+ cat >expect <<-EOF &&
+ refs/tags/nested/base $base_tag_oid tag $head_oid commit
+ refs/tags/nested/nest1 $nest1_tag_oid tag $head_oid commit
+ refs/tags/nested/nest2 $nest2_tag_oid tag $head_oid commit
+ EOF
+
+ git for-each-ref \
+ --format="%(refname) %(objectname) %(objecttype) %(*objectname) %(*objecttype)" \
+ refs/tags/nested/ >actual &&
+ test_cmp expect actual
+'
+
GRADE_FORMAT="%(signature:grade)%0a%(signature:key)%0a%(signature:signer)%0a%(signature:fingerprint)%0a%(signature:primarykeyfingerprint)"
TRUSTLEVEL_FORMAT="%(signature:trustlevel)%0a%(signature:key)%0a%(signature:signer)%0a%(signature:fingerprint)%0a%(signature:primarykeyfingerprint)"
diff --git a/t/t6302-for-each-ref-filter.sh b/t/t6302-for-each-ref-filter.sh
index af223e44d67..82f3d1ea0f2 100755
--- a/t/t6302-for-each-ref-filter.sh
+++ b/t/t6302-for-each-ref-filter.sh
@@ -45,8 +45,8 @@ test_expect_success 'check signed tags with --points-at' '
sed -e "s/Z$//" >expect <<-\EOF &&
refs/heads/side Z
refs/tags/annotated-tag four
- refs/tags/doubly-annotated-tag An annotated tag
- refs/tags/doubly-signed-tag A signed tag
+ refs/tags/doubly-annotated-tag four
+ refs/tags/doubly-signed-tag four
refs/tags/four Z
refs/tags/signed-tag four
EOF
--
gitgitgadget
