From: Junio C Hamano <gitster@pobox.com>
To: Jonathan Tan <jonathantanmy@google.com>
Cc: git@vger.kernel.org, peff@peff.net
Subject: Re: [PATCH v4 5/8] sha1_file: refactor read_object
Date: Wed, 21 Jun 2017 10:58:20 -0700 [thread overview]
Message-ID: <xmqqefudql37.fsf@gitster.mtv.corp.google.com> (raw)
In-Reply-To: <73d085b6fad9316c5a500341db2dd6451700656e.1497920092.git.jonathantanmy@google.com> (Jonathan Tan's message of "Mon, 19 Jun 2017 18:03:12 -0700")
Jonathan Tan <jonathantanmy@google.com> writes:
> @@ -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);
> @@ -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)) {
> if (status && oi->typep)
> *oi->typep = status;
> + if (oi->sizep == &size_scratch)
> + oi->sizep = NULL;
This looked somewhat unusual but nevertheless is correct. Because
of the way parse_sha1_header_extended() interacts with its callers,
the usual fn(oi->sizep ? oi->sizep : &dummy) pattern does not apply
to this codepath.
> @@ -3077,28 +3090,15 @@ 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;
> -
> - co = find_cached_object(sha1);
> - if (co) {
> - *type = co->type;
> - *size = co->size;
> - return xmemdupz(co->buf, co->size);
> - }
> + struct object_info oi = OBJECT_INFO_INIT;
> + void *content;
> + oi.typep = type;
> + oi.sizep = size;
> + oi.contentp = &content;
>
> - 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))
> + return NULL;
> + return content;
> }
Nice code reduction; it is somewhat funny to think that a function
meant to gather 'object info' does so much, but we can always say
the contents is part of the information about the object ;-).
Same comment as the other one applies here; the definition of how an
error is reported by sha1_object_info_extended() should be kept
consistent with existing callers.
Thanks.
next prev parent reply other threads:[~2017-06-21 17:58 UTC|newest]
Thread overview: 70+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-09 19:23 [RFC PATCH 0/4] Improvements to sha1_file Jonathan Tan
2017-06-09 19:23 ` [RFC PATCH 1/4] sha1_file: teach packed_object_info about typename Jonathan Tan
2017-06-12 20:55 ` Junio C Hamano
2017-06-09 19:23 ` [RFC PATCH 2/4] sha1_file: extract type and size from object_info Jonathan Tan
2017-06-10 7:01 ` Jeff King
2017-06-12 19:52 ` Jonathan Tan
2017-06-12 21:13 ` Jeff King
2017-06-09 19:23 ` [RFC PATCH 3/4] sha1_file: consolidate storage-agnostic object fns Jonathan Tan
2017-06-09 19:23 ` [RFC PATCH 4/4] sha1_file, fsck: add missing blob support Jonathan Tan
2017-06-13 21:05 ` [PATCH v2 0/4] Improvements to sha1_file Jonathan Tan
2017-06-13 21:05 ` [PATCH v2 1/4] sha1_file: teach packed_object_info about typename Jonathan Tan
2017-06-13 21:05 ` [PATCH v2 2/4] sha1_file: move delta base cache code up Jonathan Tan
2017-06-15 17:00 ` Junio C Hamano
2017-06-13 21:05 ` [PATCH v2 3/4] sha1_file: consolidate storage-agnostic object fns Jonathan Tan
2017-06-15 17:50 ` Junio C Hamano
2017-06-15 18:14 ` Jonathan Tan
2017-06-17 12:19 ` Jeff King
2017-06-19 4:18 ` Junio C Hamano
2017-06-13 21:06 ` [PATCH v2 4/4] sha1_file, fsck: add missing blob support Jonathan Tan
2017-06-15 18:34 ` Junio C Hamano
2017-06-15 20:31 ` Jonathan Tan
2017-06-15 20:52 ` Junio C Hamano
2017-06-15 20:39 ` [PATCH v3 0/4] Improvements to sha1_file Jonathan Tan
2017-06-15 20:39 ` [PATCH v3 1/4] sha1_file: teach packed_object_info about typename Jonathan Tan
2017-06-15 20:39 ` [PATCH v3 2/4] sha1_file: move delta base cache code up Jonathan Tan
2017-06-15 20:39 ` [PATCH v3 3/4] sha1_file: consolidate storage-agnostic object fns Jonathan Tan
2017-06-15 20:39 ` [PATCH v3 4/4] sha1_file, fsck: add missing blob support Jonathan Tan
2017-06-20 1:03 ` [PATCH v4 0/8] Improvements to sha1_file Jonathan Tan
2017-06-21 18:18 ` Junio C Hamano
2017-06-24 12:51 ` Jeff King
2017-06-20 1:03 ` [PATCH v4 1/8] sha1_file: teach packed_object_info about typename Jonathan Tan
2017-06-20 1:03 ` [PATCH v4 2/8] sha1_file: rename LOOKUP_UNKNOWN_OBJECT Jonathan Tan
2017-06-21 17:22 ` Junio C Hamano
2017-06-21 17:34 ` Jonathan Tan
2017-06-20 1:03 ` [PATCH v4 3/8] sha1_file: rename LOOKUP_REPLACE_OBJECT Jonathan Tan
2017-06-21 17:33 ` Junio C Hamano
2017-06-20 1:03 ` [PATCH v4 4/8] sha1_file: move delta base cache code up Jonathan Tan
2017-06-20 1:03 ` [PATCH v4 5/8] sha1_file: refactor read_object Jonathan Tan
2017-06-21 17:58 ` Junio C Hamano [this message]
2017-06-20 1:03 ` [PATCH v4 6/8] sha1_file: improve sha1_object_info_extended Jonathan Tan
2017-06-24 12:45 ` Jeff King
2017-06-26 16:45 ` Jonathan Tan
2017-06-26 17:28 ` Junio C Hamano
2017-06-26 17:35 ` Jonathan Tan
2017-06-26 17:26 ` Junio C Hamano
2017-06-20 1:03 ` [PATCH v4 7/8] sha1_file: do not access pack if unneeded Jonathan Tan
2017-06-21 18:15 ` Junio C Hamano
2017-06-24 12:48 ` Jeff King
2017-06-24 18:41 ` Junio C Hamano
2017-06-24 20:39 ` Jeff King
2017-06-26 16:28 ` Jonathan Tan
2017-06-20 1:03 ` [PATCH v4 8/8] sha1_file: refactor has_sha1_file_with_flags Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 0/8] Improvements to sha1_file Jonathan Tan
2017-06-22 1:40 ` Junio C Hamano
2017-06-22 0:40 ` [PATCH v5 1/8] sha1_file: teach packed_object_info about typename Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 2/8] sha1_file: rename LOOKUP_UNKNOWN_OBJECT Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 3/8] sha1_file: rename LOOKUP_REPLACE_OBJECT Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 4/8] sha1_file: move delta base cache code up Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 5/8] sha1_file: refactor read_object Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 6/8] sha1_file: improve sha1_object_info_extended Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 7/8] sha1_file: do not access pack if unneeded Jonathan Tan
2017-06-22 0:40 ` [PATCH v5 8/8] sha1_file: refactor has_sha1_file_with_flags Jonathan Tan
2017-07-18 10:30 ` Christian Couder
2017-07-18 16:39 ` Jonathan Tan
2017-07-19 12:52 ` Johannes Schindelin
2017-07-19 17:12 ` [PATCH] sha1_file: use access(), not lstat(), if possible Jonathan Tan
2017-07-20 21:48 ` Junio C Hamano
2017-07-22 11:16 ` Johannes Schindelin
2017-07-22 16:15 ` Junio C Hamano
2017-07-25 10:19 ` Johannes Schindelin
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