kernel/git - git - PowerEL Git System

Commit Graph

Author	SHA1	Message	Date
Nicolas Pitre	abeb40e5aa	improve reliability of fixup_pack_header_footer() Currently, this function has the potential to read corrupted pack data from disk and give it a valid SHA1 checksum. Let's add the ability to validate SHA1 checksum of existing data along the way, including before and after any arbitrary point in the pack. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	17 years ago
Nicolas Pitre	c41a4a9468	verify-pack: check packed object CRC when using index version 2 To do so, check_pack_crc() moved from builtin-pack-objects.c to pack-check.c where it is more logical to share. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	17 years ago
Nicolas Pitre	77d3ecee85	move show_pack_info() where it belongs This is called when verify_pack() has its verbose argument set, and verbose in this context makes sense only for the actual 'git verify-pack' command. Therefore let's move show_pack_info() to builtin-verify-pack.c instead and remove useless verbose argument from verify_pack(). Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	17 years ago
Nicolas Pitre	4049b9cfc0	fix const issues with some functions Two functions, namely write_idx_file() and open_pack_file(), currently return a const pointer. However that pointer is either a copy of the first argument, or set to a malloc'd buffer when that first argument is null. In the later case it is wrong to qualify that pointer as const since ownership of the buffer is transferred to the caller to dispose of, and obviously the free() function is not meant to be passed const pointers. Making the return pointer not const causes a warning when the first argument is returned since that argument is also marked const. The correct thing to do is therefore to remove the const qualifiers, avoiding the need for ugly casts only to silence some warnings. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>	17 years ago
Shawn O. Pearce	106764e651	Refactor index-pack "keep $sha1" handling for reuse There is a subtle (but important) linkage between receive-pack and index-pack that allows index-pack to create a packfile but protect it from being deleted by a concurrent `git repack -a -d` operation. The linkage works by having index-pack mark the newly created pack with a ".keep" file and then it passes the SHA-1 name of that new packfile to receive-pack along its stdout channel. The receive-pack process must unkeep the packfile by deleting the .keep file, but can it can only do so after all elgible refs have been updated in the receiving repository. This ensures that the packfile is either kept or its objects are reachable, preventing a concurrent repacker from deleting the packfile before it can determine that its objects are actually needed by the repository. The new builtin-fetch code needs to perform the same actions if it choose to run index-pack rather than unpack-objects, so I am moving this code out to its own function where both receive-pack and fetch-pack are able to invoke it when necessary. The caller is responsible for deleting the returned ".keep" and freeing the path if the returned path is not NULL. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <gitster@pobox.com>	18 years ago
Geert Bosch	aa7e44bf57	Unify write_index_file functions This patch unifies the write_index_file functions in builtin-pack-objects.c and index-pack.c. As the name "index" is overloaded in git, move in the direction of using "idx" and "pack idx" when refering to the pack index. There should be no change in functionality. Signed-off-by: Geert Bosch <bosch@gnat.com> Acked-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Dana L. How	8b0eca7c7b	Create pack-write.c for common pack writing code Include a generalized fixup_pack_header_footer() in this new file. Needed by git-repack --max-pack-size feature in a later patchset. [sp: Moved close(pack_fd) to callers, to support index-pack, and changed name to better indicate it is for packfiles.] Signed-off-by: Dana L. How <danahow@gmail.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>	18 years ago
Nicolas Pitre	4287307833	[PATCH] clean up pack index handling a bit Especially with the new index format to come, it is more appropriate to encapsulate more into check_packed_git_idx() and assume less of the index format in struct packed_git. To that effect, the index_base is renamed to index_data with void * type so it is not used directly but other pointers initialized with it. This allows for a couple pointer cast removal, as well as providing a better generic name to grep for when adding support for new index versions or formats. And index_data is declared const too while at it. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Junio C Hamano	a69e542989	Refactor the pack header reading function out of receive-pack.c Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Simon 'corecode' Schubert	bb79103194	Use fixed-size integers for the on-disk pack structure. Plain integer types without a fixed size can vary between platforms. Even though all common platforms use 32-bit ints, there is no guarantee that this won't change at some point. Furthermore, specifying an integer type with explicit size makes the definition of structures more obvious. Signed-off-by: Simon 'corecode' Schubert <corecode@fs.ei.tum.de> Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Shawn O. Pearce	df1b059d8d	Document pack .idx file format upgrade strategy. Way back when Junio developed the 64 bit index topic he came up with a means of changing the .idx file format so that older Git clients would recognize that they don't understand the file and refuse to read it, while newer clients could tell the difference between the old-style and new-style .idx files. Unfortunately this wasn't recorded anywhere. This change documents how we might go about changing the .idx file format by using a special signature in the first four bytes. Credit (and possible blame) goes completely to Junio for thinking up this technique. The change also modifies the error message of the current Git code so that users get a recommendation to upgrade their Git software should this version or later encounter a new-style .idx which it cannot process. We already do this for the .pack files, but since we usually process the .idx files first its important that these files are recognized and encourage an upgrade. Signed-off-by: Shawn O. Pearce <spearce@spearce.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Junio C Hamano	29f049a0c2	Revert "move pack creation to version 3" This reverts commit `16854571aa`. Git as recent as v1.1.6 do not understand version 3 delta. v1.2.0 is Ok and I personally would say it is old enough, but the improvement between version 2 and version 3 delta is not bit enough to justify breaking older clients. We should resurrect this later, but when we do so we shold make it conditional. Signed-off-by: Junio C Hamano <junkio@cox.net>	18 years ago
Nicolas Pitre	780e6e735b	make pack data reuse compatible with both delta types This is the missing part to git-pack-objects allowing it to reuse delta data to/from any of the two delta types. It can reuse delta from any type, and it outputs base offsets when --allow-delta-base-offset is provided and the base is also included in the pack. Otherwise it outputs base sha1 references just like it always did. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Nicolas Pitre	16854571aa	move pack creation to version 3 It's been quite a while now that GIT is able to read version 3 packs. Let's create them at last. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Linus Torvalds	1974632c66	Remove TYPE_* constant macros and use object_type enums consistently. This updates the type-enumeration constants introduced to reduce the memory footprint of "struct object" to match the type bits already used in the packfile format, by removing the former (i.e. TYPE_* constant macros) and using the latter (i.e. enum object_type) throughout the code for consistency. Eventually we can stop passing around the "type strings" entirely, and this will help - no confusion about two different integer enumeration. Signed-off-by: Linus Torvalds <torvalds@osdl.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Junio C Hamano	3f9ac8d259	pack-objects: reuse data from existing packs. When generating a new pack, notice if we have already needed objects in existing packs. If an object is stored deltified, and its base object is also what we are going to pack, then reuse the existing deltified representation unconditionally, bypassing all the expensive find_deltas() and try_deltas() calls. Also, notice if what we are going to write out exactly match what is already in an existing pack (either deltified or just compressed). In such a case, we can just copy it instead of going through the usual uncompressing & recompressing cycle. Without this patch, in linux-2.6 repository with about 1500 loose objects and a single mega pack: $ git-rev-list --objects v2.6.16-rc3 >RL $ wc -l RL 184141 RL $ time git-pack-objects p <RL Generating pack... Done counting 184141 objects. Packing 184141 objects.................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 real 12m4.323s user 11m2.560s sys 0m55.950s With this patch, the same input: $ time ../git.junio/git-pack-objects q <RL Generating pack... Done counting 184141 objects. Packing 184141 objects..................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 Total 184141, written 184141, reused 182441 real 1m2.608s user 0m55.090s sys 0m1.830s Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Junio C Hamano	a49dd05fd0	pack-objects: reuse data from existing packs. When generating a new pack, notice if we have already needed objects in existing packs. If an object is stored deltified, and its base object is also what we are going to pack, then reuse the existing deltified representation unconditionally, bypassing all the expensive find_deltas() and try_deltas() calls. Also, notice if what we are going to write out exactly match what is already in an existing pack (either deltified or just compressed). In such a case, we can just copy it instead of going through the usual uncompressing & recompressing cycle. Without this patch, in linux-2.6 repository with about 1500 loose objects and a single mega pack: $ git-rev-list --objects v2.6.16-rc3 >RL $ wc -l RL 184141 RL $ time git-pack-objects p <RL Generating pack... Done counting 184141 objects. Packing 184141 objects.................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 real 12m4.323s user 11m2.560s sys 0m55.950s With this patch, the same input: $ time ../git.junio/git-pack-objects q <RL Generating pack... Done counting 184141 objects. Packing 184141 objects..................... a1fc7b3e537fcb9b3c46b7505df859f0a11e79d2 Total 184141, written 184141, reused 182441 real 1m2.608s user 0m55.090s sys 0m1.830s Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Nicolas Pitre	d60fc1c864	remove delta-against-self bit After experimenting with code to add the ability to encode a delta against part of the deltified file, it turns out that resulting packs are _bigger_ than when this ability is not used. The raw delta output might be smaller, but it doesn't compress as well using gzip with a negative net saving on average. Said bit would in fact be more useful to allow for encoding the copying of chunks larger than 64KB providing more savings with large files. This will correspond to packs version 3. While the current code still produces packs version 2, it is made future proof so pack versions 2 and 3 are accepted. Any pack version 2 are compatible with version 3 since the redefined bit was never used before. When enough time has passed, code to use that bit to produce version 3 packs could be added. Signed-off-by: Nicolas Pitre <nico@cam.org> Signed-off-by: Junio C Hamano <junkio@cox.net>	19 years ago
Junio C Hamano	f3bf922409	[PATCH] verify-pack updates. Nico pointed out that having verify_pack.c and verify-pack.c was confusing. Rename verify_pack.c to pack-check.c as suggested, and enhances the verification done quite a bit. - Built-in sha1_file unpacking knows that a base object of a deltified object _must_ be in the same pack, and takes advantage of that fact. - Earlier verify-pack command only checked the SHA1 sum for the entire pack file and did not look into its contents. It now checks everything idx file claims to have unpacks correctly. - It now has a hook to give more detailed information for objects contained in the pack under -v flag. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Junio C Hamano	f9253394a2	[PATCH] Add git-verify-pack command. Given a list of <pack>.idx files, this command validates the index file and the corresponding .pack file for consistency. This patch also uses the same validation mechanism in fsck-cache when the --full flag is used. During normal operation, sha1_file.c verifies that a given .idx file matches the .pack file by comparing the SHA1 checksum stored in .idx file and .pack file as a minimum sanity check. We may further want to check the pack signature and version when we map the pack, but that would be a separate patch. Earlier, errors to map a pack file was not flagged fatal but led to a random fatal error later. This version explicitly die()s when such an error is detected. Signed-off-by: Junio C Hamano <junkio@cox.net> Signed-off-by: Linus Torvalds <torvalds@osdl.org>	20 years ago
Linus Torvalds	01247d8742	Make git pack files use little-endian size encoding This makes it match the new delta encoding, and admittedly makes the code easier to follow. This also updates the PACK file version to 2, since this (and the delta encoding change in the previous commit) are incompatible with the old format.	20 years ago
Linus Torvalds	a733cb606f	Change pack file format. Hopefully for the last time. This also adds a header with a signature, version info, and the number of objects to the pack file. It also encodes the file length and type more efficiently.	20 years ago

23 Commits (2c1d2d818895d896f706835142a75978aabdbdc9)