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refs/reftable: perform explicit D/F check when writing symrefs

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We already perform explicit D/F checks in all reftable callbacks which
write refs, except when writing symrefs. For one this leads to an error
message which isn't perfectly actionable because we only tell the user
that there was a D/F conflict, but not which refs conflicted with each
other. But second, once all ref updating callbacks explicitly check for
D/F conflicts, we can disable the D/F checks in the reftable library
itself and thus avoid some duplicated efforts.

Refactor the code that writes symref tables to explicitly call into
`refs_verify_refname_available()` when writing symrefs.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Patrick Steinhardt 2024-04-08 14:23:56 +02:00 committed by Junio C Hamano
parent f57cc987a9
commit 455d61b6d2
2 changed files with 18 additions and 4 deletions
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20
refs/reftable-backend.c
View file

@ -1217,6 +1217,7 @@ static int reftable_be_pack_refs(struct ref_store *ref_store,
struct write_create_symref_arg {
struct reftable_ref_store *refs;
struct reftable_stack *stack;
struct strbuf *err;
const char *refname;
const char *target;
const char *logmsg;
@ -1239,6 +1240,11 @@ static int write_create_symref_table(struct reftable_writer *writer, void *cb_da
reftable_writer_set_limits(writer, ts, ts);
ret = refs_verify_refname_available(&create->refs->base, create->refname,
NULL, NULL, create->err);
if (ret < 0)
return ret;
ret = reftable_writer_add_ref(writer, &ref);
if (ret)
return ret;
@ -1280,12 +1286,14 @@ static int reftable_be_create_symref(struct ref_store *ref_store,
struct reftable_ref_store *refs =
reftable_be_downcast(ref_store, REF_STORE_WRITE, "create_symref");
struct reftable_stack *stack = stack_for(refs, refname, &refname);
struct strbuf err = STRBUF_INIT;
struct write_create_symref_arg arg = {
.refs = refs,
.stack = stack,
.refname = refname,
.target = target,
.logmsg = logmsg,
.err = &err,
};
int ret;
@ -1301,9 +1309,15 @@ static int reftable_be_create_symref(struct ref_store *ref_store,
done:
assert(ret != REFTABLE_API_ERROR);
if (ret)
error("unable to write symref for %s: %s", refname,
reftable_error_str(ret));
if (ret) {
if (err.len)
error("%s", err.buf);
else
error("unable to write symref for %s: %s", refname,
reftable_error_str(ret));
}
strbuf_release(&err);
return ret;
}

2
t/t0610-reftable-basics.sh
View file

@ -255,7 +255,7 @@ test_expect_success 'ref transaction: creating symbolic ref fails with F/D confl
git init repo &&
test_commit -C repo A &&
cat >expect <<-EOF &&
error: unable to write symref for refs/heads: file/directory conflict
error: ${SQ}refs/heads/main${SQ} exists; cannot create ${SQ}refs/heads${SQ}
EOF
test_must_fail git -C repo symbolic-ref refs/heads refs/heads/foo 2>err &&
test_cmp expect err