[PATCH 5/5] read_sha1_file(): allow selective bypassing of replacement mechanism
- From
Junio C Hamano <gitster@pobox.com>
- Date
- May 15, 2011, 19:54 UTC
- Message-ID
- <1305489294-14341-6-git-send-email-gitster@pobox.com>
- In-Reply-To
- <1305489294-14341-1-git-send-email-gitster@pobox.com>
The way "object replacement" mechanism was tucked to the read_sha1_file() interface was suboptimal in a couple of ways:
- Callers that want it to die with useful diagnosis upon seeing a corrupt object does not have a way to say that they do not want any object replacement.
- Callers who do not want it to die but want to handle the errors themselves are told to arrange to call read_object(), but the function does not use the replacement mechanism, and also it is a file scope static function that not many callers can call to begin with.
This adds a read_sha1_file_extended() that takes a set of flags; the callers of read_sha1_file() passes a flag READ_SHA1_FILE_REPLACE to ask for object replacement mechanism to kick in.
Later, we could add another flag bit to tell the function to return an error instead of dying and then remove the misguided "call read_object() yourself".
Signed-off-by: Junio C Hamano <gitster@pobox.com> --- cache.h | 7 ++++++- sha1_file.c | 10 ++++++---- 2 files changed, 12 insertions(+), 5 deletions(-)
diff --git a/cache.h b/cache.h index c10a91d..5f1f5c3 100644 --- a/cache.h +++ b/cache.h @@ -757,7 +757,12 @@ int daemon_avoid_alias(const char *path); int offset_1st_component(const char *path); /* object replacement */ -extern void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size); +#define READ_SHA1_FILE_REPLACE 1 +extern void *read_sha1_file_extended(const unsigned char *sha1, enum object_type *type, unsigned long *size, unsigned flag); +static inline void *read_sha1_file(const unsigned char *sha1, enum object_type *type, unsigned long *size) +{ + return read_sha1_file_extended(sha1, type, size, READ_SHA1_FILE_REPLACE); +} extern const unsigned char *do_lookup_replace_object(const unsigned char *sha1); static inline const unsigned char *lookup_replace_object(const unsigned char *sha1) { diff --git a/sha1_file.c b/sha1_file.c index 5d80feb..7e6e976 100644 --- a/sha1_file.c +++ b/sha1_file.c @@ -2206,14 +2206,16 @@ static void *read_object(const unsigned char *sha1, enum object_type *type, * deal with them should arrange to call read_object() and give error * messages themselves. */ -void *read_sha1_file(const unsigned char *sha1, - enum object_type *type, - unsigned long *size) +void *read_sha1_file_extended(const unsigned char *sha1, + enum object_type *type, + unsigned long *size, + unsigned flag) { - const unsigned char *repl = lookup_replace_object(sha1); void *data; char *path; const struct packed_git *p; + const unsigned char *repl = (flag & READ_SHA1_FILE_REPLACE) + ? lookup_replace_object(sha1) : sha1; errno = 0; data = read_object(repl, type, size);
-- 1.7.5.1.334.gdfd07