@matheusbsbs / matheus-bagliano / commits / 188782ecb1

ref-filter.c: use peeled tag for '*' format fields

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@github.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>

Victoria Dye committed Nov 14, 2023 at 19:53 UTC 188782ecb1d326ff724e41a77ea8ccb72f21ad44

4 files changed +30 -13

Documentation/git-for-each-ref.txt

+2 -2

index f64fa8b406..9fa98e5872 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`,

ref-filter.c

+4 -9

index ca4ebed4eb..b1093aebb8 100644 --- a/ref-filter.c +++ b/ref-filter.c @@ -2424,17 +2424,12 @@ 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); }

t/t6300-for-each-ref.sh

+22

index 119720495e..d62ba985da 100755 --- a/t/t6300-for-each-ref.sh +++ b/t/t6300-for-each-ref.sh @@ -1728,6 +1728,28 @@ 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)"

t/t6302-for-each-ref-filter.sh

+2 -2

index af223e44d6..82f3d1ea0f 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