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-rw-r--r--refs/packed-backend.c160
1 files changed, 84 insertions, 76 deletions
diff --git a/refs/packed-backend.c b/refs/packed-backend.c
index dab8a85d9a..74e2996e93 100644
--- a/refs/packed-backend.c
+++ b/refs/packed-backend.c
@@ -5,6 +5,7 @@
#include "packed-backend.h"
#include "../iterator.h"
#include "../lockfile.h"
+#include "../chdir-notify.h"
enum mmap_strategy {
/*
@@ -68,17 +69,21 @@ struct snapshot {
int mmapped;
/*
- * The contents of the `packed-refs` file. If the file was
- * already sorted, this points at the mmapped contents of the
- * file. If not, this points at heap-allocated memory
- * containing the contents, sorted. If there were no contents
- * (e.g., because the file didn't exist), `buf` and `eof` are
- * both NULL.
+ * The contents of the `packed-refs` file:
+ *
+ * - buf -- a pointer to the start of the memory
+ * - start -- a pointer to the first byte of actual references
+ * (i.e., after the header line, if one is present)
+ * - eof -- a pointer just past the end of the reference
+ * contents
+ *
+ * If the `packed-refs` file was already sorted, `buf` points
+ * at the mmapped contents of the file. If not, it points at
+ * heap-allocated memory containing the contents, sorted. If
+ * there were no contents (e.g., because the file didn't
+ * exist), `buf`, `start`, and `eof` are all NULL.
*/
- char *buf, *eof;
-
- /* The size of the header line, if any; otherwise, 0: */
- size_t header_len;
+ char *buf, *start, *eof;
/*
* What is the peeled state of the `packed-refs` file that
@@ -169,8 +174,7 @@ static void clear_snapshot_buffer(struct snapshot *snapshot)
} else {
free(snapshot->buf);
}
- snapshot->buf = snapshot->eof = NULL;
- snapshot->header_len = 0;
+ snapshot->buf = snapshot->start = snapshot->eof = NULL;
}
/*
@@ -199,6 +203,8 @@ struct ref_store *packed_ref_store_create(const char *path,
refs->store_flags = store_flags;
refs->path = xstrdup(path);
+ chdir_notify_reparent("packed-refs", &refs->path);
+
return ref_store;
}
@@ -215,13 +221,13 @@ static struct packed_ref_store *packed_downcast(struct ref_store *ref_store,
struct packed_ref_store *refs;
if (ref_store->be != &refs_be_packed)
- die("BUG: ref_store is type \"%s\" not \"packed\" in %s",
+ BUG("ref_store is type \"%s\" not \"packed\" in %s",
ref_store->be->name, caller);
refs = (struct packed_ref_store *)ref_store;
if ((refs->store_flags & required_flags) != required_flags)
- die("BUG: unallowed operation (%s), requires %x, has %x\n",
+ BUG("unallowed operation (%s), requires %x, has %x\n",
caller, required_flags, refs->store_flags);
return refs;
@@ -319,13 +325,14 @@ static void sort_snapshot(struct snapshot *snapshot)
size_t len, i;
char *new_buffer, *dst;
- pos = snapshot->buf + snapshot->header_len;
+ pos = snapshot->start;
eof = snapshot->eof;
- len = eof - pos;
- if (!len)
+ if (pos == eof)
return;
+ len = eof - pos;
+
/*
* Initialize records based on a crude estimate of the number
* of references in the file (we'll grow it below if needed):
@@ -391,9 +398,8 @@ static void sort_snapshot(struct snapshot *snapshot)
* place:
*/
clear_snapshot_buffer(snapshot);
- snapshot->buf = new_buffer;
+ snapshot->buf = snapshot->start = new_buffer;
snapshot->eof = new_buffer + len;
- snapshot->header_len = 0;
cleanup:
free(records);
@@ -442,23 +448,26 @@ static const char *find_end_of_record(const char *p, const char *end)
*/
static void verify_buffer_safe(struct snapshot *snapshot)
{
- const char *buf = snapshot->buf + snapshot->header_len;
+ const char *start = snapshot->start;
const char *eof = snapshot->eof;
const char *last_line;
- if (buf == eof)
+ if (start == eof)
return;
- last_line = find_start_of_record(buf, eof - 1);
+ last_line = find_start_of_record(start, eof - 1);
if (*(eof - 1) != '\n' || eof - last_line < GIT_SHA1_HEXSZ + 2)
die_invalid_line(snapshot->refs->path,
last_line, eof - last_line);
}
+#define SMALL_FILE_SIZE (32*1024)
+
/*
* Depending on `mmap_strategy`, either mmap or read the contents of
* the `packed-refs` file into the snapshot. Return 1 if the file
- * existed and was read, or 0 if the file was absent. Die on errors.
+ * existed and was read, or 0 if the file was absent or empty. Die on
+ * errors.
*/
static int load_contents(struct snapshot *snapshot)
{
@@ -489,24 +498,24 @@ static int load_contents(struct snapshot *snapshot)
die_errno("couldn't stat %s", snapshot->refs->path);
size = xsize_t(st.st_size);
- switch (mmap_strategy) {
- case MMAP_NONE:
+ if (!size) {
+ close(fd);
+ return 0;
+ } else if (mmap_strategy == MMAP_NONE || size <= SMALL_FILE_SIZE) {
snapshot->buf = xmalloc(size);
bytes_read = read_in_full(fd, snapshot->buf, size);
if (bytes_read < 0 || bytes_read != size)
die_errno("couldn't read %s", snapshot->refs->path);
- snapshot->eof = snapshot->buf + size;
snapshot->mmapped = 0;
- break;
- case MMAP_TEMPORARY:
- case MMAP_OK:
+ } else {
snapshot->buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
- snapshot->eof = snapshot->buf + size;
snapshot->mmapped = 1;
- break;
}
close(fd);
+ snapshot->start = snapshot->buf;
+ snapshot->eof = snapshot->buf + size;
+
return 1;
}
@@ -515,9 +524,11 @@ static int load_contents(struct snapshot *snapshot)
* `refname` starts. If `mustexist` is true and the reference doesn't
* exist, then return NULL. If `mustexist` is false and the reference
* doesn't exist, then return the point where that reference would be
- * inserted. In the latter mode, `refname` doesn't have to be a proper
- * reference name; for example, one could search for "refs/replace/"
- * to find the start of any replace references.
+ * inserted, or `snapshot->eof` (which might be NULL) if it would be
+ * inserted at the end of the file. In the latter mode, `refname`
+ * doesn't have to be a proper reference name; for example, one could
+ * search for "refs/replace/" to find the start of any replace
+ * references.
*
* The record is sought using a binary search, so `snapshot->buf` must
* be sorted.
@@ -539,7 +550,7 @@ static const char *find_reference_location(struct snapshot *snapshot,
* preceding records all have reference names that come
* *before* `refname`.
*/
- const char *lo = snapshot->buf + snapshot->header_len;
+ const char *lo = snapshot->start;
/*
* A pointer to a the first character of a record whose
@@ -547,7 +558,7 @@ static const char *find_reference_location(struct snapshot *snapshot,
*/
const char *hi = snapshot->eof;
- while (lo < hi) {
+ while (lo != hi) {
const char *mid, *rec;
int cmp;
@@ -616,9 +627,7 @@ static struct snapshot *create_snapshot(struct packed_ref_store *refs)
/* If the file has a header line, process it: */
if (snapshot->buf < snapshot->eof && *snapshot->buf == '#') {
- struct strbuf tmp = STRBUF_INIT;
- char *p;
- const char *eol;
+ char *tmp, *p, *eol;
struct string_list traits = STRING_LIST_INIT_NODUP;
eol = memchr(snapshot->buf, '\n',
@@ -628,9 +637,9 @@ static struct snapshot *create_snapshot(struct packed_ref_store *refs)
snapshot->buf,
snapshot->eof - snapshot->buf);
- strbuf_add(&tmp, snapshot->buf, eol - snapshot->buf);
+ tmp = xmemdupz(snapshot->buf, eol - snapshot->buf);
- if (!skip_prefix(tmp.buf, "# pack-refs with:", (const char **)&p))
+ if (!skip_prefix(tmp, "# pack-refs with:", (const char **)&p))
die_invalid_line(refs->path,
snapshot->buf,
snapshot->eof - snapshot->buf);
@@ -647,10 +656,10 @@ static struct snapshot *create_snapshot(struct packed_ref_store *refs)
/* perhaps other traits later as well */
/* The "+ 1" is for the LF character. */
- snapshot->header_len = eol + 1 - snapshot->buf;
+ snapshot->start = eol + 1;
string_list_clear(&traits, 0);
- strbuf_release(&tmp);
+ free(tmp);
}
verify_buffer_safe(snapshot);
@@ -671,13 +680,12 @@ static struct snapshot *create_snapshot(struct packed_ref_store *refs)
* We don't want to leave the file mmapped, so we are
* forced to make a copy now:
*/
- size_t size = snapshot->eof -
- (snapshot->buf + snapshot->header_len);
+ size_t size = snapshot->eof - snapshot->start;
char *buf_copy = xmalloc(size);
- memcpy(buf_copy, snapshot->buf + snapshot->header_len, size);
+ memcpy(buf_copy, snapshot->start, size);
clear_snapshot_buffer(snapshot);
- snapshot->buf = buf_copy;
+ snapshot->buf = snapshot->start = buf_copy;
snapshot->eof = buf_copy + size;
}
@@ -716,7 +724,7 @@ static struct snapshot *get_snapshot(struct packed_ref_store *refs)
}
static int packed_read_raw_ref(struct ref_store *ref_store,
- const char *refname, unsigned char *sha1,
+ const char *refname, struct object_id *oid,
struct strbuf *referent, unsigned int *type)
{
struct packed_ref_store *refs =
@@ -734,7 +742,7 @@ static int packed_read_raw_ref(struct ref_store *ref_store,
return -1;
}
- if (get_sha1_hex(rec, sha1))
+ if (get_oid_hex(rec, oid))
die_invalid_line(refs->path, rec, snapshot->eof - rec);
*type = REF_ISPACKED;
@@ -744,7 +752,7 @@ static int packed_read_raw_ref(struct ref_store *ref_store,
/*
* This value is set in `base.flags` if the peeled value of the
* current reference is known. In that case, `peeled` contains the
- * correct peeled value for the reference, which might be `null_sha1`
+ * correct peeled value for the reference, which might be `null_oid`
* if the reference is not a tag or if it is broken.
*/
#define REF_KNOWS_PEELED 0x40
@@ -880,7 +888,7 @@ static int packed_ref_iterator_peel(struct ref_iterator *ref_iterator,
} else if ((iter->base.flags & (REF_ISBROKEN | REF_ISSYMREF))) {
return -1;
} else {
- return !!peel_object(iter->oid.hash, peeled->hash);
+ return !!peel_object(&iter->oid, peeled);
}
}
@@ -924,7 +932,12 @@ static struct ref_iterator *packed_ref_iterator_begin(
*/
snapshot = get_snapshot(refs);
- if (!snapshot->buf)
+ if (prefix && *prefix)
+ start = find_reference_location(snapshot, prefix, 0);
+ else
+ start = snapshot->start;
+
+ if (start == snapshot->eof)
return empty_ref_iterator_begin();
iter = xcalloc(1, sizeof(*iter));
@@ -934,11 +947,6 @@ static struct ref_iterator *packed_ref_iterator_begin(
iter->snapshot = snapshot;
acquire_snapshot(snapshot);
- if (prefix && *prefix)
- start = find_reference_location(snapshot, prefix, 0);
- else
- start = snapshot->buf + snapshot->header_len;
-
iter->pos = start;
iter->eof = snapshot->eof;
strbuf_init(&iter->refname_buf, 0);
@@ -961,11 +969,11 @@ static struct ref_iterator *packed_ref_iterator_begin(
* by the failing call to `fprintf()`.
*/
static int write_packed_entry(FILE *fh, const char *refname,
- const unsigned char *sha1,
- const unsigned char *peeled)
+ const struct object_id *oid,
+ const struct object_id *peeled)
{
- if (fprintf(fh, "%s %s\n", sha1_to_hex(sha1), refname) < 0 ||
- (peeled && fprintf(fh, "^%s\n", sha1_to_hex(peeled)) < 0))
+ if (fprintf(fh, "%s %s\n", oid_to_hex(oid), refname) < 0 ||
+ (peeled && fprintf(fh, "^%s\n", oid_to_hex(peeled)) < 0))
return -1;
return 0;
@@ -1029,7 +1037,7 @@ void packed_refs_unlock(struct ref_store *ref_store)
"packed_refs_unlock");
if (!is_lock_file_locked(&refs->lock))
- die("BUG: packed_refs_unlock() called when not locked");
+ BUG("packed_refs_unlock() called when not locked");
rollback_lock_file(&refs->lock);
}
@@ -1082,7 +1090,7 @@ static int write_with_updates(struct packed_ref_store *refs,
char *packed_refs_path;
if (!is_lock_file_locked(&refs->lock))
- die("BUG: write_with_updates() called while unlocked");
+ BUG("write_with_updates() called while unlocked");
/*
* If packed-refs is a symlink, we want to overwrite the
@@ -1152,7 +1160,7 @@ static int write_with_updates(struct packed_ref_store *refs,
"reference already exists",
update->refname);
goto error;
- } else if (oidcmp(&update->old_oid, iter->oid)) {
+ } else if (!oideq(&update->old_oid, iter->oid)) {
strbuf_addf(err, "cannot update ref '%s': "
"is at %s but expected %s",
update->refname,
@@ -1203,8 +1211,8 @@ static int write_with_updates(struct packed_ref_store *refs,
int peel_error = ref_iterator_peel(iter, &peeled);
if (write_packed_entry(out, iter->refname,
- iter->oid->hash,
- peel_error ? NULL : peeled.hash))
+ iter->oid,
+ peel_error ? NULL : &peeled))
goto write_error;
if ((ok = ref_iterator_advance(iter)) != ITER_OK)
@@ -1220,12 +1228,12 @@ static int write_with_updates(struct packed_ref_store *refs,
i++;
} else {
struct object_id peeled;
- int peel_error = peel_object(update->new_oid.hash,
- peeled.hash);
+ int peel_error = peel_object(&update->new_oid,
+ &peeled);
if (write_packed_entry(out, update->refname,
- update->new_oid.hash,
- peel_error ? NULL : peeled.hash))
+ &update->new_oid,
+ peel_error ? NULL : &peeled))
goto write_error;
i++;
@@ -1340,7 +1348,7 @@ int is_packed_transaction_needed(struct ref_store *ref_store,
continue;
if (!refs_read_raw_ref(ref_store, update->refname,
- oid.hash, &referent, &type) ||
+ &oid, &referent, &type) ||
errno != ENOENT) {
/*
* We have to actually delete that reference
@@ -1556,21 +1564,21 @@ static int packed_create_symref(struct ref_store *ref_store,
const char *refname, const char *target,
const char *logmsg)
{
- die("BUG: packed reference store does not support symrefs");
+ BUG("packed reference store does not support symrefs");
}
static int packed_rename_ref(struct ref_store *ref_store,
const char *oldrefname, const char *newrefname,
const char *logmsg)
{
- die("BUG: packed reference store does not support renaming references");
+ BUG("packed reference store does not support renaming references");
}
static int packed_copy_ref(struct ref_store *ref_store,
const char *oldrefname, const char *newrefname,
const char *logmsg)
{
- die("BUG: packed reference store does not support copying references");
+ BUG("packed reference store does not support copying references");
}
static struct ref_iterator *packed_reflog_iterator_begin(struct ref_store *ref_store)
@@ -1603,7 +1611,7 @@ static int packed_create_reflog(struct ref_store *ref_store,
const char *refname, int force_create,
struct strbuf *err)
{
- die("BUG: packed reference store does not support reflogs");
+ BUG("packed reference store does not support reflogs");
}
static int packed_delete_reflog(struct ref_store *ref_store,
@@ -1613,7 +1621,7 @@ static int packed_delete_reflog(struct ref_store *ref_store,
}
static int packed_reflog_expire(struct ref_store *ref_store,
- const char *refname, const unsigned char *sha1,
+ const char *refname, const struct object_id *oid,
unsigned int flags,
reflog_expiry_prepare_fn prepare_fn,
reflog_expiry_should_prune_fn should_prune_fn,
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-08 00:38:18 +0000