/*
* How to handle various characters in refnames:
+ * This table is used by both the SIMD and non-SIMD code. It has
+ * some cases that are only useful for the SIMD; these are handled
+ * equivalently to the listed disposition in the non-SIMD code.
* 0: An acceptable character for refs
- * 1: End-of-component
- * 2: ., look for a preceding . to reject .. in refs
- * 3: {, look for a preceding @ to reject @{ in refs
- * 4: A bad character: ASCII control characters, "~", "^", ":" or SP
+ * 1: @, look for a following { to reject @{ in refs (SIMD or = 0)
+ * 2: \0: End-of-component and string
+ * 3: /: End-of-component (SIMD or = 2)
+ * 4: ., look for a preceding . to reject .. in refs
+ * 5: {, look for a preceding @ to reject @{ in refs
+ * 6: *, usually a bad character except, once as a wildcard (SIMD or = 7)
+ * 7: A bad character except * (see check_refname_component below)
*/
static unsigned char refname_disposition[256] = {
- 1, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
- 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
- 4, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 2, 1,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 0, 0, 0, 0, 4,
+ 2, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7,
+ 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 4, 3,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 7,
+ 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 7, 7, 0, 7, 0,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 4, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
- 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 4, 4
+ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 7, 7
};
/*
* - any path component of it begins with ".", or
* - it has double dots "..", or
* - it has ASCII control character, "~", "^", ":" or SP, anywhere, or
- * - it ends with a "/".
- * - it ends with ".lock"
+ * - it has pattern-matching notation "*", "?", "[", anywhere, or
+ * - it ends with a "/", or
+ * - it ends with ".lock", or
* - it contains a "\" (backslash)
*/
static int check_refname_component(const char *refname, int flags)
int ch = *cp & 255;
unsigned char disp = refname_disposition[ch];
switch (disp) {
- case 1:
+ case 2: /* fall-through */
+ case 3:
goto out;
- case 2:
+ case 4:
if (last == '.')
return -1; /* Refname contains "..". */
break;
- case 3:
+ case 5:
if (last == '@')
return -1; /* Refname contains "@{". */
break;
- case 4:
+ case 6: /* fall-through */
+ case 7:
return -1;
}
last = ch;
return cp - refname;
}
-int check_refname_format(const char *refname, int flags)
+static int check_refname_format_bytewise(const char *refname, int flags)
{
int component_len, component_count = 0;
return 0;
}
+#if defined(__GNUC__) && defined(__x86_64__)
+#define SSE_VECTOR_BYTES 16
+
+/* Vectorized version of check_refname_format. */
+int check_refname_format(const char *refname, int flags)
+{
+ const char *cp = refname;
+
+ const __m128i dot = _mm_set1_epi8('.');
+ const __m128i at = _mm_set1_epi8('@');
+ const __m128i curly = _mm_set1_epi8('{');
+ const __m128i slash = _mm_set1_epi8('/');
+ const __m128i zero = _mm_set1_epi8('\000');
+ const __m128i el = _mm_set1_epi8('l');
+
+ /* below '*', all characters are forbidden or rare */
+ const __m128i star_ub = _mm_set1_epi8('*' + 1);
+
+ const __m128i colon = _mm_set1_epi8(':');
+ const __m128i question = _mm_set1_epi8('?');
+
+ /* '['..'^' contains 4 characters: 3 forbidden and 1 rare */
+ const __m128i bracket_lb = _mm_set1_epi8('[' - 1);
+ const __m128i caret_ub = _mm_set1_epi8('^' + 1);
+
+ /* '~' and above are forbidden */
+ const __m128i tilde_lb = _mm_set1_epi8('~' - 1);
+
+ int component_count = 0;
+ int orig_flags = flags;
+
+ if (refname[0] == 0 || refname[0] == '/') {
+ /* entirely empty ref or initial ref component */
+ return -1;
+ }
+
+ /*
+ * Initial ref component of '.'; below we look for /. so we'll
+ * miss this.
+ */
+ if (refname[0] == '.') {
+ if (refname[1] == '/' || refname[1] == '\0')
+ return -1;
+ if (!(flags & REFNAME_DOT_COMPONENT))
+ return -1;
+ }
+ while(1) {
+ __m128i tmp, tmp1, result;
+ uint64_t mask;
+
+ if ((uintptr_t) cp % PAGE_SIZE > PAGE_SIZE - SSE_VECTOR_BYTES - 1)
+ /*
+ * End-of-page; fall back to slow method for
+ * this entire ref.
+ */
+ return check_refname_format_bytewise(refname, orig_flags);
+
+ tmp = _mm_loadu_si128((__m128i *)cp);
+ tmp1 = _mm_loadu_si128((__m128i *)(cp + 1));
+
+ /*
+ * This range (note the lt) contains some
+ * permissible-but-rare characters (including all
+ * characters >= 128), which we handle later. It also
+ * includes \000.
+ */
+ result = _mm_cmplt_epi8(tmp, star_ub);
+
+ result = _mm_or_si128(result, _mm_cmpeq_epi8(tmp, question));
+ result = _mm_or_si128(result, _mm_cmpeq_epi8(tmp, colon));
+
+ /* This range contains the permissible ] as bycatch */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpgt_epi8(tmp, bracket_lb),
+ _mm_cmplt_epi8(tmp, caret_ub)));
+
+ result = _mm_or_si128(result, _mm_cmpgt_epi8(tmp, tilde_lb));
+
+ /* .. */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, dot),
+ _mm_cmpeq_epi8(tmp1, dot)));
+ /* @{ */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, at),
+ _mm_cmpeq_epi8(tmp1, curly)));
+ /* // */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, slash),
+ _mm_cmpeq_epi8(tmp1, slash)));
+ /* trailing / */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, slash),
+ _mm_cmpeq_epi8(tmp1, zero)));
+ /* .l, beginning of .lock */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, dot),
+ _mm_cmpeq_epi8(tmp1, el)));
+ /*
+ * Even though /. is not necessarily an error, we flag
+ * it anyway. If we find it, we'll check if it's valid
+ * and if so we'll advance just past it.
+ */
+ result = _mm_or_si128(result, _mm_and_si128(
+ _mm_cmpeq_epi8(tmp, slash),
+ _mm_cmpeq_epi8(tmp1, dot)));
+
+ mask = _mm_movemask_epi8(result);
+ if (mask) {
+ /*
+ * We've found either end-of-string, or some
+ * probably-bad character or substring.
+ */
+ int i = __builtin_ctz(mask);
+ switch (refname_disposition[cp[i] & 255]) {
+ case 0: /* fall-through */
+ case 5:
+ /*
+ * bycatch: a good character that's in
+ * one of the ranges of mostly-forbidden
+ * characters
+ */
+ cp += i + 1;
+ break;
+ case 1:
+ if (cp[i + 1] == '{')
+ return -1;
+ cp += i + 1;
+ break;
+ case 2:
+ if (!(flags & REFNAME_ALLOW_ONELEVEL)
+ && !component_count && !strchr(refname, '/'))
+ /* Refname has only one component. */
+ return -1;
+ return 0;
+ case 3:
+ component_count ++;
+ /*
+ * Even if leading dots are allowed, don't
+ * allow "." as a component (".." is
+ * prevented by case 4 below).
+ */
+ if (cp[i + 1] == '.') {
+ if (cp[i + 2] == '\0')
+ return -1;
+ if (flags & REFNAME_DOT_COMPONENT) {
+ /* skip to just after the /. */
+ cp += i + 2;
+ break;
+ }
+ return -1;
+ } else if (cp[i + 1] == '/' || cp[i + 1] == '\0')
+ return -1;
+ break;
+ case 4:
+ if (cp[i + 1] == '.' || cp[i + 1] == '\0')
+ return -1;
+ /* .lock as end-of-component or end-of-string */
+ if ((!strncmp(cp + i, ".lock", 5))
+ && (cp[i + 5] == '/' || cp[i + 5] == 0))
+ return -1;
+ cp += 1;
+ break;
+ case 6:
+ if (((cp == refname + i) || cp[i - 1] == '/')
+ && (cp[i + 1] == '/' || cp[i + 1] == 0))
+ if (flags & REFNAME_REFSPEC_PATTERN) {
+ flags &= ~REFNAME_REFSPEC_PATTERN;
+ /* restart after the * */
+ cp += i + 1;
+ continue;
+ }
+ /* fall-through */
+ case 7:
+ return -1;
+ }
+ } else
+ cp += SSE_VECTOR_BYTES;
+ }
+}
+
+#else
+
+int check_refname_format (const char *refname, int flags)
+{
+ return check_refname_format_bytewise(refname, flags);
+}
+
+#endif
+
struct ref_entry;
/*
if (de->d_name[0] == '.')
continue;
- if (has_extension(de->d_name, ".lock"))
+ if (ends_with(de->d_name, ".lock"))
continue;
strbuf_addstr(&refname, de->d_name);
refdir = *refs->name
if (o->type == OBJ_NONE) {
int type = sha1_object_info(name, NULL);
- if (type < 0)
+ if (type < 0 || !object_as_type(o, type, 0))
return PEEL_INVALID;
- o->type = type;
}
if (o->type != OBJ_TAG)
len += copy_msg(logrec + len - 1, msg) - 1;
written = len <= maxlen ? write_in_full(logfd, logrec, len) : -1;
free(logrec);
- if (close(logfd) != 0 || written != len)
- return error("Unable to append to %s", log_file);
+ if (written != len) {
+ int save_errno = errno;
+ close(logfd);
+ error("Unable to append to %s", log_file);
+ errno = save_errno;
+ return -1;
+ }
+ if (close(logfd)) {
+ int save_errno = errno;
+ error("Unable to append to %s", log_file);
+ errno = save_errno;
+ return -1;
+ }
return 0;
}
-static int is_branch(const char *refname)
+int is_branch(const char *refname)
{
return !strcmp(refname, "HEAD") || starts_with(refname, "refs/heads/");
}
+/* This function must return a meaningful errno */
int write_ref_sha1(struct ref_lock *lock,
const unsigned char *sha1, const char *logmsg)
{
static char term = '\n';
struct object *o;
- if (!lock)
+ if (!lock) {
+ errno = EINVAL;
return -1;
+ }
if (!lock->force_write && !hashcmp(lock->old_sha1, sha1)) {
unlock_ref(lock);
return 0;
error("Trying to write ref %s with nonexistent object %s",
lock->ref_name, sha1_to_hex(sha1));
unlock_ref(lock);
+ errno = EINVAL;
return -1;
}
if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
error("Trying to write non-commit object %s to branch %s",
sha1_to_hex(sha1), lock->ref_name);
unlock_ref(lock);
+ errno = EINVAL;
return -1;
}
if (write_in_full(lock->lock_fd, sha1_to_hex(sha1), 40) != 40 ||
- write_in_full(lock->lock_fd, &term, 1) != 1
- || close_ref(lock) < 0) {
+ write_in_full(lock->lock_fd, &term, 1) != 1 ||
+ close_ref(lock) < 0) {
+ int save_errno = errno;
error("Couldn't write %s", lock->lk->filename);
unlock_ref(lock);
+ errno = save_errno;
return -1;
}
clear_loose_ref_cache(&ref_cache);
if (de->d_name[0] == '.')
continue;
- if (has_extension(de->d_name, ".lock"))
+ if (ends_with(de->d_name, ".lock"))
continue;
strbuf_addstr(name, de->d_name);
if (stat(git_path("logs/%s", name->buf), &st) < 0) {
static int update_ref_write(const char *action, const char *refname,
const unsigned char *sha1, struct ref_lock *lock,
- enum action_on_err onerr)
+ struct strbuf *err, enum action_on_err onerr)
{
if (write_ref_sha1(lock, sha1, action) < 0) {
const char *str = "Cannot update the ref '%s'.";
+ if (err)
+ strbuf_addf(err, str, refname);
+
switch (onerr) {
case UPDATE_REFS_MSG_ON_ERR: error(str, refname); break;
case UPDATE_REFS_DIE_ON_ERR: die(str, refname); break;
return update;
}
-void ref_transaction_update(struct ref_transaction *transaction,
- const char *refname,
- const unsigned char *new_sha1,
- const unsigned char *old_sha1,
- int flags, int have_old)
+int ref_transaction_update(struct ref_transaction *transaction,
+ const char *refname,
+ const unsigned char *new_sha1,
+ const unsigned char *old_sha1,
+ int flags, int have_old,
+ struct strbuf *err)
{
- struct ref_update *update = add_update(transaction, refname);
+ struct ref_update *update;
+ if (have_old && !old_sha1)
+ die("BUG: have_old is true but old_sha1 is NULL");
+
+ update = add_update(transaction, refname);
hashcpy(update->new_sha1, new_sha1);
update->flags = flags;
update->have_old = have_old;
if (have_old)
hashcpy(update->old_sha1, old_sha1);
+ return 0;
}
void ref_transaction_create(struct ref_transaction *transaction,
lock = update_ref_lock(refname, oldval, flags, NULL, onerr);
if (!lock)
return 1;
- return update_ref_write(action, refname, sha1, lock, onerr);
+ return update_ref_write(action, refname, sha1, lock, NULL, onerr);
}
static int ref_update_compare(const void *r1, const void *r2)
}
static int ref_update_reject_duplicates(struct ref_update **updates, int n,
- enum action_on_err onerr)
+ struct strbuf *err)
{
int i;
for (i = 1; i < n; i++)
if (!strcmp(updates[i - 1]->refname, updates[i]->refname)) {
const char *str =
"Multiple updates for ref '%s' not allowed.";
- switch (onerr) {
- case UPDATE_REFS_MSG_ON_ERR:
- error(str, updates[i]->refname); break;
- case UPDATE_REFS_DIE_ON_ERR:
- die(str, updates[i]->refname); break;
- case UPDATE_REFS_QUIET_ON_ERR:
- break;
- }
+ if (err)
+ strbuf_addf(err, str, updates[i]->refname);
+
return 1;
}
return 0;
}
int ref_transaction_commit(struct ref_transaction *transaction,
- const char *msg, struct strbuf *err,
- enum action_on_err onerr)
+ const char *msg, struct strbuf *err)
{
int ret = 0, delnum = 0, i;
const char **delnames;
/* Copy, sort, and reject duplicate refs */
qsort(updates, n, sizeof(*updates), ref_update_compare);
- ret = ref_update_reject_duplicates(updates, n, onerr);
+ ret = ref_update_reject_duplicates(updates, n, err);
if (ret)
goto cleanup;
(update->have_old ?
update->old_sha1 : NULL),
update->flags,
- &update->type, onerr);
+ &update->type,
+ UPDATE_REFS_QUIET_ON_ERR);
if (!update->lock) {
if (err)
strbuf_addf(err, "Cannot lock the ref '%s'.",
ret = update_ref_write(msg,
update->refname,
update->new_sha1,
- update->lock, onerr);
+ update->lock, err,
+ UPDATE_REFS_QUIET_ON_ERR);
update->lock = NULL; /* freed by update_ref_write */
if (ret)
goto cleanup;