зеркало из https://github.com/microsoft/git.git
Transitively read alternatives
When adding an alternate object store then add entries from its info/alternates files, too. Relative entries are only allowed in the current repository. Loops and duplicate alternates through multiple repositories are ignored. Just to be sure that nothing breaks it is not allow to build deep nesting levels using info/alternates. Signed-off-by: Martin Waitz <tali@admingilde.org> Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Martin Waitz
Junio C Hamano
Родитель
fd60acaced
Коммит
c2f493a4ae
178
sha1_file.c
178
sha1_file.c
|
|
@ -217,6 +217,8 @@ char *sha1_pack_index_name(const unsigned char *sha1)
|
|||
struct alternate_object_database *alt_odb_list;
|
||||
static struct alternate_object_database **alt_odb_tail;
|
||||
|
||||
static void read_info_alternates(const char * alternates, int depth);
|
||||
|
||||
/*
|
||||
* Prepare alternate object database registry.
|
||||
*
|
||||
|
|
@ -232,13 +234,84 @@ static struct alternate_object_database **alt_odb_tail;
|
|||
* SHA1, an extra slash for the first level indirection, and the
|
||||
* terminating NUL.
|
||||
*/
|
||||
static int link_alt_odb_entry(const char * entry, int len, const char * relative_base, int depth)
|
||||
{
|
||||
struct stat st;
|
||||
const char *objdir = get_object_directory();
|
||||
struct alternate_object_database *ent;
|
||||
struct alternate_object_database *alt;
|
||||
/* 43 = 40-byte + 2 '/' + terminating NUL */
|
||||
int pfxlen = len;
|
||||
int entlen = pfxlen + 43;
|
||||
int base_len = -1;
|
||||
|
||||
if (*entry != '/' && relative_base) {
|
||||
/* Relative alt-odb */
|
||||
if (base_len < 0)
|
||||
base_len = strlen(relative_base) + 1;
|
||||
entlen += base_len;
|
||||
pfxlen += base_len;
|
||||
}
|
||||
ent = xmalloc(sizeof(*ent) + entlen);
|
||||
|
||||
if (*entry != '/' && relative_base) {
|
||||
memcpy(ent->base, relative_base, base_len - 1);
|
||||
ent->base[base_len - 1] = '/';
|
||||
memcpy(ent->base + base_len, entry, len);
|
||||
}
|
||||
else
|
||||
memcpy(ent->base, entry, pfxlen);
|
||||
|
||||
ent->name = ent->base + pfxlen + 1;
|
||||
ent->base[pfxlen + 3] = '/';
|
||||
ent->base[pfxlen] = ent->base[entlen-1] = 0;
|
||||
|
||||
/* Detect cases where alternate disappeared */
|
||||
if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
|
||||
error("object directory %s does not exist; "
|
||||
"check .git/objects/info/alternates.",
|
||||
ent->base);
|
||||
free(ent);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* Prevent the common mistake of listing the same
|
||||
* thing twice, or object directory itself.
|
||||
*/
|
||||
for (alt = alt_odb_list; alt; alt = alt->next) {
|
||||
if (!memcmp(ent->base, alt->base, pfxlen)) {
|
||||
free(ent);
|
||||
return -1;
|
||||
}
|
||||
}
|
||||
if (!memcmp(ent->base, objdir, pfxlen)) {
|
||||
free(ent);
|
||||
return -1;
|
||||
}
|
||||
|
||||
/* add the alternate entry */
|
||||
*alt_odb_tail = ent;
|
||||
alt_odb_tail = &(ent->next);
|
||||
ent->next = NULL;
|
||||
|
||||
/* recursively add alternates */
|
||||
read_info_alternates(ent->base, depth + 1);
|
||||
|
||||
ent->base[pfxlen] = '/';
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
|
||||
const char *relative_base)
|
||||
const char *relative_base, int depth)
|
||||
{
|
||||
const char *cp, *last;
|
||||
struct alternate_object_database *ent;
|
||||
const char *objdir = get_object_directory();
|
||||
int base_len = -1;
|
||||
|
||||
if (depth > 5) {
|
||||
error("%s: ignoring alternate object stores, nesting too deep.",
|
||||
relative_base);
|
||||
return;
|
||||
}
|
||||
|
||||
last = alt;
|
||||
while (last < ep) {
|
||||
|
|
@ -249,60 +322,15 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
|
|||
last = cp + 1;
|
||||
continue;
|
||||
}
|
||||
for ( ; cp < ep && *cp != sep; cp++)
|
||||
;
|
||||
while (cp < ep && *cp != sep)
|
||||
cp++;
|
||||
if (last != cp) {
|
||||
struct stat st;
|
||||
struct alternate_object_database *alt;
|
||||
/* 43 = 40-byte + 2 '/' + terminating NUL */
|
||||
int pfxlen = cp - last;
|
||||
int entlen = pfxlen + 43;
|
||||
|
||||
if (*last != '/' && relative_base) {
|
||||
/* Relative alt-odb */
|
||||
if (base_len < 0)
|
||||
base_len = strlen(relative_base) + 1;
|
||||
entlen += base_len;
|
||||
pfxlen += base_len;
|
||||
}
|
||||
ent = xmalloc(sizeof(*ent) + entlen);
|
||||
|
||||
if (*last != '/' && relative_base) {
|
||||
memcpy(ent->base, relative_base, base_len - 1);
|
||||
ent->base[base_len - 1] = '/';
|
||||
memcpy(ent->base + base_len,
|
||||
last, cp - last);
|
||||
}
|
||||
else
|
||||
memcpy(ent->base, last, pfxlen);
|
||||
|
||||
ent->name = ent->base + pfxlen + 1;
|
||||
ent->base[pfxlen + 3] = '/';
|
||||
ent->base[pfxlen] = ent->base[entlen-1] = 0;
|
||||
|
||||
/* Detect cases where alternate disappeared */
|
||||
if (stat(ent->base, &st) || !S_ISDIR(st.st_mode)) {
|
||||
error("object directory %s does not exist; "
|
||||
"check .git/objects/info/alternates.",
|
||||
ent->base);
|
||||
goto bad;
|
||||
}
|
||||
ent->base[pfxlen] = '/';
|
||||
|
||||
/* Prevent the common mistake of listing the same
|
||||
* thing twice, or object directory itself.
|
||||
*/
|
||||
for (alt = alt_odb_list; alt; alt = alt->next)
|
||||
if (!memcmp(ent->base, alt->base, pfxlen))
|
||||
goto bad;
|
||||
if (!memcmp(ent->base, objdir, pfxlen)) {
|
||||
bad:
|
||||
free(ent);
|
||||
}
|
||||
else {
|
||||
*alt_odb_tail = ent;
|
||||
alt_odb_tail = &(ent->next);
|
||||
ent->next = NULL;
|
||||
if ((*last != '/') && depth) {
|
||||
error("%s: ignoring relative alternate object store %s",
|
||||
relative_base, last);
|
||||
} else {
|
||||
link_alt_odb_entry(last, cp - last,
|
||||
relative_base, depth);
|
||||
}
|
||||
}
|
||||
while (cp < ep && *cp == sep)
|
||||
|
|
@ -311,23 +339,14 @@ static void link_alt_odb_entries(const char *alt, const char *ep, int sep,
|
|||
}
|
||||
}
|
||||
|
||||
void prepare_alt_odb(void)
|
||||
static void read_info_alternates(const char * relative_base, int depth)
|
||||
{
|
||||
char path[PATH_MAX];
|
||||
char *map;
|
||||
int fd;
|
||||
struct stat st;
|
||||
char *alt;
|
||||
char path[PATH_MAX];
|
||||
int fd;
|
||||
|
||||
alt = getenv(ALTERNATE_DB_ENVIRONMENT);
|
||||
if (!alt) alt = "";
|
||||
|
||||
if (alt_odb_tail)
|
||||
return;
|
||||
alt_odb_tail = &alt_odb_list;
|
||||
link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL);
|
||||
|
||||
sprintf(path, "%s/info/alternates", get_object_directory());
|
||||
sprintf(path, "%s/info/alternates", relative_base);
|
||||
fd = open(path, O_RDONLY);
|
||||
if (fd < 0)
|
||||
return;
|
||||
|
|
@ -340,11 +359,26 @@ void prepare_alt_odb(void)
|
|||
if (map == MAP_FAILED)
|
||||
return;
|
||||
|
||||
link_alt_odb_entries(map, map + st.st_size, '\n',
|
||||
get_object_directory());
|
||||
link_alt_odb_entries(map, map + st.st_size, '\n', relative_base, depth);
|
||||
|
||||
munmap(map, st.st_size);
|
||||
}
|
||||
|
||||
void prepare_alt_odb(void)
|
||||
{
|
||||
char *alt;
|
||||
|
||||
alt = getenv(ALTERNATE_DB_ENVIRONMENT);
|
||||
if (!alt) alt = "";
|
||||
|
||||
if (alt_odb_tail)
|
||||
return;
|
||||
alt_odb_tail = &alt_odb_list;
|
||||
link_alt_odb_entries(alt, alt + strlen(alt), ':', NULL, 0);
|
||||
|
||||
read_info_alternates(get_object_directory(), 0);
|
||||
}
|
||||
|
||||
static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
|
||||
{
|
||||
char *name = sha1_file_name(sha1);
|
||||
|
|
|
|||
Загрузка…
Ссылка в новой задаче