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sha1_file: refactor read_object

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read_object() and sha1_object_info_extended() both implement mechanisms
such as object replacement, retrying the packed store after failing to
find the object in the packed store then the loose store, and being able
to mark a packed object as bad and then retrying the whole process.
Consolidating these mechanisms would be a great help to maintainability.

Therefore, consolidate them by extending sha1_object_info_extended() to
support the functionality needed, and then modifying read_object() to
use sha1_object_info_extended().

Signed-off-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jonathan Tan 2017-06-21 17:40:21 -07:00 committed by Junio C Hamano
parent 845b102b99
commit c84a1f3ed4
2 changed files with 43 additions and 42 deletions
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1
cache.h
View File

@ -1827,6 +1827,7 @@ struct object_info {
off_t *disk_sizep;
unsigned char *delta_base_sha1;
struct strbuf *typename;
void **contentp;
/* Response */
enum {

72
sha1_file.c
View File

@ -2005,19 +2005,6 @@ int parse_sha1_header(const char *hdr, unsigned long *sizep)
return parse_sha1_header_extended(hdr, &oi, 0);
}
static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
{
int ret;
git_zstream stream;
char hdr[8192];
ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
return NULL;
return unpack_sha1_rest(&stream, hdr, *size, sha1);
}
unsigned long get_size_from_delta(struct packed_git *p,
struct pack_window **w_curs,
off_t curpos)
@ -2326,7 +2313,9 @@ static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
if (!ent)
return unpack_entry(p, base_offset, type, base_size);
if (type)
*type = ent->type;
if (base_size)
*base_size = ent->size;
return xmemdupz(ent->data, ent->size);
}
@ -2388,9 +2377,16 @@ int packed_object_info(struct packed_git *p, off_t obj_offset,
* We always get the representation type, but only convert it to
* a "real" type later if the caller is interested.
*/
if (oi->contentp) {
*oi->contentp = cache_or_unpack_entry(p, obj_offset, oi->sizep,
&type);
if (!*oi->contentp)
type = OBJ_BAD;
} else {
type = unpack_object_header(p, &w_curs, &curpos, &size);
}
if (oi->sizep) {
if (!oi->contentp && oi->sizep) {
if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
off_t tmp_pos = curpos;
off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
@ -2679,7 +2675,9 @@ void *unpack_entry(struct packed_git *p, off_t obj_offset,
free(external_base);
}
if (final_type)
*final_type = type;
if (final_size)
*final_size = size;
unuse_pack(&w_curs);
@ -2914,6 +2912,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
git_zstream stream;
char hdr[32];
struct strbuf hdrbuf = STRBUF_INIT;
unsigned long size_scratch;
if (oi->delta_base_sha1)
hashclr(oi->delta_base_sha1);
@ -2926,7 +2925,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
* return value implicitly indicates whether the
* object even exists.
*/
if (!oi->typep && !oi->typename && !oi->sizep) {
if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
const char *path;
struct stat st;
if (stat_sha1_file(sha1, &st, &path) < 0)
@ -2939,6 +2938,10 @@ static int sha1_loose_object_info(const unsigned char *sha1,
map = map_sha1_file(sha1, &mapsize);
if (!map)
return -1;
if (!oi->sizep)
oi->sizep = &size_scratch;
if (oi->disk_sizep)
*oi->disk_sizep = mapsize;
if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
@ -2956,10 +2959,18 @@ static int sha1_loose_object_info(const unsigned char *sha1,
sha1_to_hex(sha1));
} else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
status = error("unable to parse %s header", sha1_to_hex(sha1));
if (status >= 0 && oi->contentp)
*oi->contentp = unpack_sha1_rest(&stream, hdr,
*oi->sizep, sha1);
else
git_inflate_end(&stream);
munmap(map, mapsize);
if (status && oi->typep)
*oi->typep = status;
if (oi->sizep == &size_scratch)
oi->sizep = NULL;
strbuf_release(&hdrbuf);
return (status < 0) ? status : 0;
}
@ -2985,6 +2996,8 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
hashclr(oi->delta_base_sha1);
if (oi->typename)
strbuf_addstr(oi->typename, typename(co->type));
if (oi->contentp)
*oi->contentp = xmemdupz(co->buf, co->size);
oi->whence = OI_CACHED;
return 0;
}
@ -3078,28 +3091,15 @@ int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
static void *read_object(const unsigned char *sha1, enum object_type *type,
unsigned long *size)
{
unsigned long mapsize;
void *map, *buf;
struct cached_object *co;
struct object_info oi = OBJECT_INFO_INIT;
void *content;
oi.typep = type;
oi.sizep = size;
oi.contentp = &content;
co = find_cached_object(sha1);
if (co) {
*type = co->type;
*size = co->size;
return xmemdupz(co->buf, co->size);
}
buf = read_packed_sha1(sha1, type, size);
if (buf)
return buf;
map = map_sha1_file(sha1, &mapsize);
if (map) {
buf = unpack_sha1_file(map, mapsize, type, size, sha1);
munmap(map, mapsize);
return buf;
}
reprepare_packed_git();
return read_packed_sha1(sha1, type, size);
if (sha1_object_info_extended(sha1, &oi, 0) < 0)
return NULL;
return content;
}
/*