int ref_transaction_update(struct ref_transaction *transaction,
const char *refname,
const unsigned char *new_sha1,
const unsigned char *old_sha1,
unsigned int flags, const char *msg,
struct strbuf *err)
{
assert(err);
if ((new_sha1 && !is_null_sha1(new_sha1)) ?
check_refname_format(refname, REFNAME_ALLOW_ONELEVEL) :
!refname_is_safe(refname)) {
strbuf_addf(err, "refusing to update ref with bad name '%s'",
refname);
return -1;
}
flags |= (new_sha1 ? REF_HAVE_NEW : 0) | (old_sha1 ? REF_HAVE_OLD : 0);
ref_transaction_add_update(transaction, refname, flags,
new_sha1, old_sha1, msg);
return 0;
}
/*
* Move the iterator to the next record in the snapshot, without
* respect for whether the record is actually required by the current
* iteration. Adjust the fields in `iter` and return `ITER_OK` or
* `ITER_DONE`. This function does not free the iterator in the case
* of `ITER_DONE`.
*/
static int next_record(struct packed_ref_iterator *iter)
{
const char *p = iter->pos, *eol;
strbuf_reset(&iter->refname_buf);
if (iter->pos == iter->eof)
return ITER_DONE;
iter->base.flags = REF_ISPACKED;
if (iter->eof - p < GIT_SHA1_HEXSZ + 2 ||
parse_oid_hex(p, &iter->oid, &p) ||
!isspace(*p++))
die_invalid_line(iter->snapshot->refs->path,
iter->pos, iter->eof - iter->pos);
eol = memchr(p, '\n', iter->eof - p);
if (!eol)
die_unterminated_line(iter->snapshot->refs->path,
iter->pos, iter->eof - iter->pos);
strbuf_add(&iter->refname_buf, p, eol - p);
iter->base.refname = iter->refname_buf.buf;
if (check_refname_format(iter->base.refname, REFNAME_ALLOW_ONELEVEL)) {
if (!refname_is_safe(iter->base.refname))
die("packed refname is dangerous: %s",
iter->base.refname);
oidclr(&iter->oid);
iter->base.flags |= REF_BAD_NAME | REF_ISBROKEN;
}
if (iter->snapshot->peeled == PEELED_FULLY ||
(iter->snapshot->peeled == PEELED_TAGS &&
starts_with(iter->base.refname, "refs/tags/")))
iter->base.flags |= REF_KNOWS_PEELED;
iter->pos = eol + 1;
if (iter->pos < iter->eof && *iter->pos == '^') {
p = iter->pos + 1;
if (iter->eof - p < GIT_SHA1_HEXSZ + 1 ||
parse_oid_hex(p, &iter->peeled, &p) ||
*p++ != '\n')
die_invalid_line(iter->snapshot->refs->path,
iter->pos, iter->eof - iter->pos);
iter->pos = p;
/*
* Regardless of what the file header said, we
* definitely know the value of *this* reference. But
* we suppress it if the reference is broken:
*/
if ((iter->base.flags & REF_ISBROKEN)) {
oidclr(&iter->peeled);
iter->base.flags &= ~REF_KNOWS_PEELED;
} else {
iter->base.flags |= REF_KNOWS_PEELED;
}
} else {
oidclr(&iter->peeled);
}
return ITER_OK;
}
/* This function needs to return a meaningful errno on failure */
static const char *resolve_ref_recursively(struct ref_store *refs,
const char *refname,
int resolve_flags,
unsigned char *sha1, int *flags)
{
static struct strbuf sb_refname = STRBUF_INIT;
int unused_flags;
int symref_count;
if (!flags)
flags = &unused_flags;
*flags = 0;
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
!refname_is_safe(refname)) {
errno = EINVAL;
return NULL;
}
/*
* dwim_ref() uses REF_ISBROKEN to distinguish between
* missing refs and refs that were present but invalid,
* to complain about the latter to stderr.
*
* We don't know whether the ref exists, so don't set
* REF_ISBROKEN yet.
*/
*flags |= REF_BAD_NAME;
}
for (symref_count = 0; symref_count < SYMREF_MAXDEPTH; symref_count++) {
unsigned int read_flags = 0;
if (refs->be->read_raw_ref(refs, refname,
sha1, &sb_refname, &read_flags)) {
*flags |= read_flags;
if (errno != ENOENT || (resolve_flags & RESOLVE_REF_READING))
return NULL;
hashclr(sha1);
if (*flags & REF_BAD_NAME)
*flags |= REF_ISBROKEN;
return refname;
}
*flags |= read_flags;
if (!(read_flags & REF_ISSYMREF)) {
if (*flags & REF_BAD_NAME) {
hashclr(sha1);
*flags |= REF_ISBROKEN;
}
return refname;
}
refname = sb_refname.buf;
if (resolve_flags & RESOLVE_REF_NO_RECURSE) {
hashclr(sha1);
return refname;
}
if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
if (!(resolve_flags & RESOLVE_REF_ALLOW_BAD_NAME) ||
!refname_is_safe(refname)) {
errno = EINVAL;
return NULL;
}
*flags |= REF_ISBROKEN | REF_BAD_NAME;
}
}
errno = ELOOP;
return NULL;
}
