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update-ref: add support for 'symref-create' command

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Add 'symref-create' command to the '--stdin' mode 'git-update-ref' to
allow creation of symbolic refs in a transaction. The 'symref-create'
command takes in a <new-target>, which the created <ref> will point to.

Also, support the 'core.prefersymlinkrefs' config, wherein if the config
is set and the filesystem supports symlinks, we create the symbolic ref
as a symlink. We fallback to creating a regular symref if creating the
symlink is unsuccessful.

Helped-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Karthik Nayak
2024-06-07 15:33:02 +02:00
committed by Junio C Hamano
parent 2343720967
commit ed3272720e
9 changed files with 146 additions and 6 deletions
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9
refs.c
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@ -1302,15 +1302,18 @@ int ref_transaction_update(struct ref_transaction *transaction,
int ref_transaction_create(struct ref_transaction *transaction,
const char *refname,
const struct object_id *new_oid,
const char *new_target,
unsigned int flags, const char *msg,
struct strbuf *err)
{
if (!new_oid || is_null_oid(new_oid)) {
strbuf_addf(err, "'%s' has a null OID", refname);
if (new_oid && new_target)
BUG("create called with both new_oid and new_target set");
if ((!new_oid || is_null_oid(new_oid)) && !new_target) {
strbuf_addf(err, "'%s' has neither a valid OID nor a target", refname);
return 1;
}
return ref_transaction_update(transaction, refname, new_oid,
null_oid(), NULL, NULL, flags,
null_oid(), new_target, NULL, flags,
msg, err);
}