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2018-05-08Merge branch 'ds/commit-graph'Libravatar Junio C Hamano1-2/+2
Precompute and store information necessary for ancestry traversal in a separate file to optimize graph walking. * ds/commit-graph: commit-graph: implement "--append" option commit-graph: build graph from starting commits commit-graph: read only from specific pack-indexes commit: integrate commit graph with commit parsing commit-graph: close under reachability commit-graph: add core.commitGraph setting commit-graph: implement git commit-graph read commit-graph: implement git-commit-graph write commit-graph: implement write_commit_graph() commit-graph: create git-commit-graph builtin graph: add commit graph design document commit-graph: add format document csum-file: refactor finalize_hashfile() method csum-file: rename hashclose() to finalize_hashfile()
2018-04-11Merge branch 'sb/packfiles-in-repository'Libravatar Junio C Hamano1-39/+37
Refactoring of the internal global data structure continues. * sb/packfiles-in-repository: packfile: keep prepare_packed_git() private packfile: allow find_pack_entry to handle arbitrary repositories packfile: add repository argument to find_pack_entry packfile: allow reprepare_packed_git to handle arbitrary repositories packfile: allow prepare_packed_git to handle arbitrary repositories packfile: allow prepare_packed_git_one to handle arbitrary repositories packfile: add repository argument to reprepare_packed_git packfile: add repository argument to prepare_packed_git packfile: add repository argument to prepare_packed_git_one packfile: allow install_packed_git to handle arbitrary repositories packfile: allow rearrange_packed_git to handle arbitrary repositories packfile: allow prepare_packed_git_mru to handle arbitrary repositories
2018-04-11Merge branch 'sb/object-store'Libravatar Junio C Hamano1-33/+44
Refactoring the internal global data structure to make it possible to open multiple repositories, work with and then close them. Rerolled by Duy on top of a separate preliminary clean-up topic. The resulting structure of the topics looked very sensible. * sb/object-store: (27 commits) sha1_file: allow sha1_loose_object_info to handle arbitrary repositories sha1_file: allow map_sha1_file to handle arbitrary repositories sha1_file: allow map_sha1_file_1 to handle arbitrary repositories sha1_file: allow open_sha1_file to handle arbitrary repositories sha1_file: allow stat_sha1_file to handle arbitrary repositories sha1_file: allow sha1_file_name to handle arbitrary repositories sha1_file: add repository argument to sha1_loose_object_info sha1_file: add repository argument to map_sha1_file sha1_file: add repository argument to map_sha1_file_1 sha1_file: add repository argument to open_sha1_file sha1_file: add repository argument to stat_sha1_file sha1_file: add repository argument to sha1_file_name sha1_file: allow prepare_alt_odb to handle arbitrary repositories sha1_file: allow link_alt_odb_entries to handle arbitrary repositories sha1_file: add repository argument to prepare_alt_odb sha1_file: add repository argument to link_alt_odb_entries sha1_file: add repository argument to read_info_alternates sha1_file: add repository argument to link_alt_odb_entry sha1_file: add raw_object_store argument to alt_odb_usable pack: move approximate object count to object store ...
2018-04-11commit-graph: read only from specific pack-indexesLibravatar Derrick Stolee1-2/+2
Teach git-commit-graph to inspect the objects only in a certain list of pack-indexes within the given pack directory. This allows updating the commit graph iteratively. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: keep prepare_packed_git() privateLibravatar Nguyễn Thái Ngọc Duy1-1/+4
The reason callers have to call this is to make sure either packed_git or packed_git_mru pointers are initialized since we don't do that by default. Sometimes it's hard to see this connection between where the function is called and where packed_git pointer is used (sometimes in separate functions). Keep this dependency internal because now all access to packed_git and packed_git_mru must go through get_xxx() wrappers. Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow find_pack_entry to handle arbitrary repositoriesLibravatar Stefan Beller1-6/+5
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: add repository argument to find_pack_entryLibravatar Stefan Beller1-6/+2
While at it move the documentation to the header and mention which pack files are searched. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow reprepare_packed_git to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+4
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow prepare_packed_git to handle arbitrary repositoriesLibravatar Stefan Beller1-9/+9
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow prepare_packed_git_one to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+3
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: add repository argument to reprepare_packed_gitLibravatar Stefan Beller1-1/+1
See previous patch for explanation. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: add repository argument to prepare_packed_gitLibravatar Stefan Beller1-5/+5
Add a repository argument to allow prepare_packed_git callers to be more specific about which repository to handle. See commit "sha1_file: add repository argument to link_alt_odb_entry" for an explanation of the #define trick. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: add repository argument to prepare_packed_git_oneLibravatar Stefan Beller1-3/+4
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow install_packed_git to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+4
This conversion was done without the #define trick used in the earlier series refactoring to have better repository access, because this function is easy to review, as it only has one caller and all lines but the first two are converted. We must not convert 'pack_open_fds' to be a repository specific variable, as it is used to monitor resource usage of the machine that Git executes on. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow rearrange_packed_git to handle arbitrary repositoriesLibravatar Stefan Beller1-4/+4
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26packfile: allow prepare_packed_git_mru to handle arbitrary repositoriesLibravatar Stefan Beller1-5/+5
This conversion was done without the #define trick used in the earlier series refactoring to have better repository access, because this function is easy to review, as all lines are converted and it has only one caller Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26sha1_file: add repository argument to prepare_alt_odbLibravatar Stefan Beller1-1/+1
See previous patch for explanation. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26pack: move approximate object count to object storeLibravatar Stefan Beller1-6/+5
The approximate_object_count() function maintains a rough count of objects in a repository to estimate how long object name abbreviates should be. Object names are scoped to a repository and the appropriate length may differ by repository, so the object count should not be global. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26pack: move prepare_packed_git_run_once to object storeLibravatar Stefan Beller1-4/+3
Each repository's object store can be initialized independently, so they must not share a run_once variable. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26object-store: close all packs upon clearing the object storeLibravatar Stefan Beller1-2/+2
Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-26object-store: move packed_git and packed_git_mru to object storeLibravatar Stefan Beller1-20/+31
In a process with multiple repositories open, packfile accessors should be associated to a single repository and not shared globally. Move packed_git and packed_git_mru into the_repository and adjust callers to reflect this. [nd: while at there, wrap access to these two fields in get_packed_git() and get_packed_git_mru(). This allows us to lazily initialize these fields without caller doing that explicitly] Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-23object-store: move alt_odb_list and alt_odb_tail to object storeLibravatar Stefan Beller1-1/+2
In a process with multiple repositories open, alternates should be associated to a single repository and not shared globally. Move alt_odb_list and alt_odb_tail into the_repository and adjust callers to reflect this. Now that the alternative object data base is per repository, we're leaking its memory upon freeing a repository. The next patch plugs this hole. No functional change intended. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-23object-store: migrate alternates struct and functions from cache.hLibravatar Stefan Beller1-0/+1
Migrate the struct alternate_object_database and all its related functions to the object store as these functions are easier found in that header. The migration is just a verbatim copy, no need to include the object store header at any C file, because cache.h includes repository.h which in turn includes the object-store.h Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-22packfile: define and use bsearch_pack()Libravatar Derrick Stolee1-16/+26
The method bsearch_hash() generalizes binary searches using a fanout table. The only consumer is currently find_pack_entry_one(). It requires a bit of pointer arithmetic to align the fanout table and the lookup table depending on the pack-index version. Extract the pack-index pointer arithmetic to a new method, bsearch_pack(), so this can be re-used in other code paths. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-14sha1_file: convert sha1_object_info* to object_idLibravatar brian m. carlson1-2/+2
Convert sha1_object_info and sha1_object_info_extended to take pointers to struct object_id and rename them to use "oid" instead of "sha1" in their names. Update the declaration and definition and apply the following semantic patch, plus the standard object_id transforms: @@ expression E1, E2; @@ - sha1_object_info(E1.hash, E2) + oid_object_info(&E1, E2) @@ expression E1, E2; @@ - sha1_object_info(E1->hash, E2) + oid_object_info(E1, E2) @@ expression E1, E2, E3; @@ - sha1_object_info_extended(E1.hash, E2, E3) + oid_object_info_extended(&E1, E2, E3) @@ expression E1, E2, E3; @@ - sha1_object_info_extended(E1->hash, E2, E3) + oid_object_info_extended(E1, E2, E3) Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-14packfile: convert unpack_entry to struct object_idLibravatar brian m. carlson1-11/+11
Convert unpack_entry and read_object to use struct object_id. Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-14sha1_file: convert retry_bad_packed_offset to struct object_idLibravatar brian m. carlson1-4/+4
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-03-13Merge branch 'jt/binsearch-with-fanout' into HEADLibravatar Junio C Hamano1-25/+4
* jt/binsearch-with-fanout: packfile: refactor hash search with fanout table packfile: remove GIT_DEBUG_LOOKUP log statements
2018-03-06Merge branch 'bw/c-plus-plus'Libravatar Junio C Hamano1-4/+4
Avoid using identifiers that clash with C++ keywords. Even though it is not a goal to compile Git with C++ compilers, changes like this help use of code analysis tools that targets C++ on our codebase. * bw/c-plus-plus: (37 commits) replace: rename 'new' variables trailer: rename 'template' variables tempfile: rename 'template' variables wrapper: rename 'template' variables environment: rename 'namespace' variables diff: rename 'template' variables environment: rename 'template' variables init-db: rename 'template' variables unpack-trees: rename 'new' variables trailer: rename 'new' variables submodule: rename 'new' variables split-index: rename 'new' variables remote: rename 'new' variables ref-filter: rename 'new' variables read-cache: rename 'new' variables line-log: rename 'new' variables imap-send: rename 'new' variables http: rename 'new' variables entry: rename 'new' variables diffcore-delta: rename 'new' variables ...
2018-02-27Merge branch 'jt/binsearch-with-fanout'Libravatar Junio C Hamano1-25/+4
Refactor the code to binary search starting from a fan-out table (which is how the packfile is indexed with object names) into a reusable helper. * jt/binsearch-with-fanout: packfile: refactor hash search with fanout table packfile: remove GIT_DEBUG_LOOKUP log statements
2018-02-15packfile: refactor hash search with fanout tableLibravatar Jonathan Tan1-14/+4
Subsequent patches will introduce file formats that make use of a fanout array and a sorted table containing hashes, just like packfiles. Refactor the hash search in packfile.c into its own function, so that those patches can make use of it as well. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-02-15packfile: remove GIT_DEBUG_LOOKUP log statementsLibravatar Jonathan Tan1-11/+0
In commit 628522ec1439 ("sha1-lookup: more memory efficient search in sorted list of SHA-1", 2008-04-09), a different algorithm for searching a sorted list was introduced, together with a set of log statements guarded by GIT_DEBUG_LOOKUP that are invoked both when using that algorithm and when using the existing binary search. Those log statements was meant for experiments and debugging, but with the removal of the aforementioned different algorithm in commit f1068efefe6d ("sha1_file: drop experimental GIT_USE_LOOKUP search", 2017-08-09), those log statements are probably no longer necessary. Remove those statements. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-02-14object: rename function 'typename' to 'type_name'Libravatar Brandon Williams1-1/+1
Rename C++ keyword in order to bring the codebase closer to being able to be compiled with a C++ compiler. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-02-14object_info: change member name from 'typename' to 'type_name'Libravatar Brandon Williams1-3/+3
Rename C++ keyword in order to bring the codebase closer to being able to be compiled with a C++ compiler. Signed-off-by: Brandon Williams <bmwill@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-02-13Merge branch 'ds/use-get-be64'Libravatar Junio C Hamano1-2/+1
Code clean-up. * ds/use-get-be64: packfile: use get_be64() for large offsets
2018-02-13Merge branch 'gs/retire-mru'Libravatar Junio C Hamano1-8/+9
Retire mru API as it does not give enough abstraction over underlying list API to be worth it. * gs/retire-mru: mru: Replace mru.[ch] with list.h implementation
2018-02-13Merge branch 'ot/mru-on-list'Libravatar Junio C Hamano1-3/+4
The first step to getting rid of mru API and using the doubly-linked list API directly instead. * ot/mru-on-list: mru: use double-linked list from list.h
2018-01-24mru: Replace mru.[ch] with list.h implementationLibravatar Gargi Sharma1-8/+9
Replace the custom calls to mru.[ch] with calls to list.h. This patch is the final step in removing the mru API completely and inlining the logic. This patch leads to significant code reduction and the mru API hence, is not a useful abstraction anymore. Signed-off-by: Gargi Sharma <gs051095@gmail.com> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-01-19packfile: use get_be64() for large offsetsLibravatar Derrick Stolee1-2/+1
The pack-index version 2 format uses two 4-byte integers in network-byte order to represent one 8-byte value. The current implementation has several code clones for stitching these integers together. Use get_be64() to create an 8-byte integer from two 4-byte integers represented this way. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-12-05fsck: introduce partialclone extensionLibravatar Jonathan Tan1-3/+74
Currently, Git does not support repos with very large numbers of objects or repos that wish to minimize manipulation of certain blobs (for example, because they are very large) very well, even if the user operates mostly on part of the repo, because Git is designed on the assumption that every referenced object is available somewhere in the repo storage. In such an arrangement, the full set of objects is usually available in remote storage, ready to be lazily downloaded. Teach fsck about the new state of affairs. In this commit, teach fsck that missing promisor objects referenced from the reflog are not an error case; in future commits, fsck will be taught about other cases. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-10-10cleanup: fix possible overflow errors in binary searchLibravatar Derrick Stolee1-1/+1
A common mistake when writing binary search is to allow possible integer overflow by using the simple average: mid = (min + max) / 2; Instead, use the overflow-safe version: mid = min + (max - min) / 2; This translation is safe since the operation occurs inside a loop conditioned on "min < max". The included changes were found using the following git grep: git grep '/ *2;' '*.c' Making this cleanup will prevent future review friction when a new binary search is contructed based on existing code. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Reviewed-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-10-03Merge branch 'jk/read-in-full'Libravatar Junio C Hamano1-2/+9
Code clean-up to prevent future mistakes by copying and pasting code that checks the result of read_in_full() function. * jk/read-in-full: worktree: check the result of read_in_full() worktree: use xsize_t to access file size distinguish error versus short read from read_in_full() avoid looking at errno for short read_in_full() returns prefer "!=" when checking read_in_full() result notes-merge: drop dead zero-write code files-backend: prefer "0" for write_in_full() error check
2017-10-01mru: use double-linked list from list.hLibravatar Olga Telezhnaya1-3/+4
Simplify mru.[ch] and related code by reusing the double-linked list implementation from list.h instead of a custom one. This commit is an intermediate step. Our final goal is to get rid of mru.[ch] at all and inline all logic. Mentored-by: Christian Couder <christian.couder@gmail.com> Mentored by: Jeff King <peff@peff.net> Signed-off-by: Olga Telezhnaia <olyatelezhnaya@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-09-27distinguish error versus short read from read_in_full()Libravatar Jeff King1-2/+9
Many callers of read_in_full() expect to see the exact number of bytes requested, but their error handling lumps together true read errors and short reads due to unexpected EOF. We can give more specific error messages by separating these cases (showing errno when appropriate, and otherwise describing the short read). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-09-14pack: make packed_git_mru global a value instead of a pointerLibravatar Jonathan Nieder1-7/+5
The MRU cache that keeps track of recently used packs is represented using two global variables: struct mru packed_git_mru_storage; struct mru *packed_git_mru = &packed_git_mru_storage; Callers never assign to the packed_git_mru pointer, though, so we can simplify by eliminating it and using &packed_git_mru_storage (renamed to &packed_git_mru) directly. This variable is only used by the packfile subsystem, making this a relatively uninvasive change (and any new unadapted callers would trigger a compile error). Noticed while moving these globals to the object_store struct. Signed-off-by: Stefan Beller <sbeller@google.com> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Acked-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-23pack: move for_each_packed_object()Libravatar Jonathan Tan1-0/+40
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-23pack: move has_pack_index()Libravatar Jonathan Tan1-0/+8
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-23pack: move has_sha1_pack()Libravatar Jonathan Tan1-0/+6
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-23pack: move find_pack_entry() and make it globalLibravatar Jonathan Tan1-0/+53
This function needs to be global as it is used by sha1_file.c and will be used by packfile.c. Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-08-23pack: move find_sha1_pack()Libravatar Jonathan Tan1-0/+13
Signed-off-by: Jonathan Tan <jonathantanmy@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>