src/merge.c


Log

Author Commit Date CI Message
Patrick Steinhardt ecf4f33a 2018-02-08T11:14:48 Convert usage of `git_buf_free` to new `git_buf_dispose`
Tyrie Vella 1403c612 2018-01-22T14:44:31 merge: virtual commit should be last argument to merge-base Our virtual commit must be the last argument to merge-base: since our algorithm pushes _both_ parents of the virtual commit, it needs to be the last argument, since merge-base: > Given three commits A, B and C, git merge-base A B C will compute the > merge base between A and a hypothetical commit M We want to calculate the merge base between the actual commit ("two") and the virtual commit ("one") - since one actually pushes its parents to the merge-base calculation, we need to calculate the merge base of "two" and the parents of one.
Edward Thomson b924df1e 2018-01-21T18:05:45 merge: reverse merge bases for recursive merge When the commits being merged have multiple merge bases, reverse the order when creating the virtual merge base. This is for compatibility with git's merge-recursive algorithm, and ensures that we build identical trees. Git does this to try to use older merge bases first. Per 8918b0c: > It seems to be the only sane way to do it: when a two-head merge is > done, and the merge-base and one of the two branches agree, the > merge assumes that the other branch has something new. > > If we start creating virtual commits from newer merge-bases, and go > back to older merge-bases, and then merge with newer commits again, > chances are that a patch is lost, _because_ the merge-base and the > head agree on it. Unlikely, yes, but it happened to me.
Edward Thomson 185b0d08 2018-01-20T19:41:28 merge: recursive uses larger conflict markers Git uses longer conflict markers in the recursive merge base - two more than the default (thus, 9 character long conflict markers). This allows users to tell the difference between the recursive merge conflicts and conflicts between the ours and theirs branches. This was introduced in git d694a17986a28bbc19e2a6c32404ca24572e400f. Update our tests to expect this as well.
Patrick Steinhardt 0c7f49dd 2017-06-30T13:39:01 Make sure to always include "common.h" first Next to including several files, our "common.h" header also declares various macros which are then used throughout the project. As such, we have to make sure to always include this file first in all implementation files. Otherwise, we might encounter problems or even silent behavioural differences due to macros or defines not being defined as they should be. So in fact, our header and implementation files should make sure to always include "common.h" first. This commit does so by establishing a common include pattern. Header files inside of "src" will now always include "common.h" as its first other file, separated by a newline from all the other includes to make it stand out as special. There are two cases for the implementation files. If they do have a matching header file, they will always include this one first, leading to "common.h" being transitively included as first file. If they do not have a matching header file, they instead include "common.h" as first file themselves. This fixes the outlined problems and will become our standard practice for header and source files inside of the "src/" from now on.
Patrick Steinhardt 4dc87e72 2017-06-21T13:35:46 merge: fix potential free of uninitialized memory The function `merge_diff_mark_similarity_exact` may error our early and, when it does so, free the `ours_deletes_by_oid` and `theirs_deletes_by_oid` variables. While the first one can never be uninitialized due to the first call actually assigning to it, the second variable can be freed without being initialized. Fix the issue by initializing both variables to `NULL`.
Michael Tesch cee1e7af 2017-04-12T14:38:30 merge: perform exact rename detection in linear time The current exact rename detection has order n^2 complexity. We can do better by using a map to first aggregate deletes and using that to match deletes to adds. This results in a substantial performance improvement for merges with a large quantity of adds and deletes.
Edward Thomson 69873685 2017-03-23T09:49:09 Merge branch 'pr/3957'
Edward Thomson b53d834f 2017-03-23T09:46:22 merge: indentation fixup
Patrick Steinhardt 84f56cb0 2016-11-04T11:59:52 repository: rename `path_repository` and `path_gitlink` The `path_repository` variable is actually confusing to think about, as it is not always clear what the repository actually is. It may either be the path to the folder containing worktree and .git directory, the path to .git itself, a worktree or something entirely different. Actually, the intent of the variable is to hold the path to the gitdir, which is either the .git directory or the bare repository. Rename the variable to `gitdir` to avoid confusion. While at it, also rename `path_gitlink` to `gitlink` to improve consistency.
Edward Thomson 95367366 2017-02-09T16:57:22 merge: don't do rename detection on submodules
Carlos Martín Nieto 2854e619 2017-01-14T17:12:23 Merge pull request #4061 from libgit2/ethomson/merge_opts merge: set default rename threshold
Edward Thomson 19ed4d0c 2017-01-01T22:19:23 merge: set default rename threshold When `GIT_MERGE_FIND_RENAMES` is set, provide a default for `rename_threshold` when it is unset.
Edward Thomson 909d5494 2016-12-29T12:25:15 giterr_set: consistent error messages Error messages should be sentence fragments, and therefore: 1. Should not begin with a capital letter, 2. Should not conclude with punctuation, and 3. Should not end a sentence and begin a new one
Patrick Steinhardt c77a55a9 2016-11-14T10:05:31 common: use PRIuZ for size_t in `giterr_set` calls
Arthur Schreiber 6d354747 2016-10-18T08:20:41 Perf: Don't perform merge operations for trivial merges. When one side of a merge is treesame to the ancestor, we can take the other side and skip all the expensive merge operations. This optimization can only be performed when the generation of REUC extension data is skipped.
Edward Thomson 9be638ec 2016-04-19T15:12:18 git_diff_generated: abstract generated diffs
Jason Haslam c864b4ab 2016-05-12T13:18:07 Ignore submodules when checking for merge conflicts in the workdir.
Edward Thomson d953c450 2016-02-28T21:30:00 merge drivers: handle configured but not found driver
Edward Thomson 6d8b2cdb 2016-02-28T09:34:11 merge driver: remove `check` callback Since the `apply` callback can defer, the `check` callback is not necessary. Removing the `check` callback further makes the `payload` unnecessary along with the `cleanup` callback.
Edward Thomson 967e073d 2016-02-27T16:42:02 merge driver: correct global initialization
Edward Thomson 7a3ab14f 2016-02-07T15:58:34 merge driver: get a pointer to favor
Edward Thomson 46625836 2016-02-07T15:19:43 merge driver: correct indentation
Edward Thomson 30a94ab7 2015-12-24T22:52:23 merge driver: allow custom default driver Allow merge users to configure a custom default merge driver via `git_merge_options`. Similarly, honor the `merge.default` configuration option.
Edward Thomson 3f04219f 2015-12-23T10:23:08 merge driver: introduce custom merge drivers Consumers can now register custom merged drivers with `git_merge_driver_register`. This allows consumers to support the merge drivers, as configured in `.gitattributes`. Consumers will be asked to perform the file-level merge when a custom driver is configured.
Stan Hu 7a74590d 2015-12-03T09:57:56 Fix rebase bug and include test for merge=union
Stan Hu f8787098 2015-10-31T18:50:13 Support union merges via .gitattributes file
Arthur Schreiber 3679ebae 2016-02-11T23:37:52 Horrible fix for #3173.
Patrick Steinhardt fac42ff9 2016-02-08T16:58:08 merge: fix memory leak
Vicent Marti 879ebab3 2015-12-16T12:30:52 merge: Use `git_index__fill` to populate the index Instead of calling `git_index_add` in a loop, use the new `git_index_fill` internal API to fill the index with the initial staged entries. The new `fill` helper assumes that all the entries will be unique and valid, so it can append them at the end of the entries vector and only sort it once at the end. It performs no validation checks. This prevents the quadratic behavior caused by having to sort the entries list once after every insertion.
Edward Thomson 5b9c63c3 2015-11-20T19:01:42 recursive merge: add a recursion limit
Edward Thomson 78859c63 2015-11-20T17:33:49 merge: handle conflicts in recursive base building When building a recursive merge base, allow conflicts to occur. Use the file (with conflict markers) as the common ancestor. The user has already seen and dealt with this conflict by virtue of having a criss-cross merge. If they resolved this conflict identically in both branches, then there will be no conflict in the result. This is the best case scenario. If they did not resolve the conflict identically in the two branches, then we will generate a new conflict. If the user is simply using standard conflict output then the results will be fairly sensible. But if the user is using a mergetool or using diff3 output, then the common ancestor will be a conflict file (itself with diff3 output, haha!). This is quite terrible, but it matches git's behavior.
Edward Thomson 76ade3a0 2015-11-10T21:21:26 merge: use annotated commits for recursion Use annotated commits to act as our virtual bases, instead of regular commits, to avoid polluting the odb with virtual base commits and trees. Instead, build an annotated commit with an index and pointers to the commits that it was merged from.
Edward Thomson 7730fe8e 2015-11-09T13:01:48 merge: merge annotated commits instead of regular commits
Edward Thomson 3f2bb387 2015-10-28T11:00:55 merge: octopus merge common ancestors when >2 When there are more than two common ancestors, continue merging the virtual base with the additional common ancestors, effectively octopus merging a new virtual base.
Edward Thomson 1b82f7b6 2015-10-27T14:24:51 merge: compute octopus merge bases
Edward Thomson 75dee59c 2015-10-26T10:37:58 merge: build virtual base of multiple merge bases When the commits to merge have multiple common ancestors, build a "virtual" base tree by merging the common ancestors.
Edward Thomson fa78782f 2015-10-22T17:00:09 merge: rename `git_merge_tree_flags_t` -> `git_merge_flags_t`
Vicent Marti 1d0bed9d 2015-10-30T14:02:01 merge-base: Style
Vicent Marti 4cacf5b5 2015-10-30T11:50:43 merge-base: Do not read parents from the root
Vicent Marti 136a71f4 2015-10-30T11:45:52 merge-base: Remove redundant merge bases
Vicent Marti d845abe6 2015-10-28T14:49:28 merge: Do not mallocz unecessary entries
Vicent Marti d3416dfe 2015-10-28T10:50:25 pool: Dot not assume mallocs are zeroed out
Vicent Marti 1e5e02b4 2015-10-27T17:26:04 pool: Simplify implementation
Vicent Marti 7a02e93e 2015-10-27T22:42:40 merge: Plug memory leak
Vicent Marti a1f5d691 2015-10-27T22:42:15 merge: Implement `GIT_MERGE_TREE_SKIP_REUC`
Edward Thomson 8683d31f 2015-10-22T14:39:20 merge: add GIT_MERGE_TREE_FAIL_ON_CONFLICT Provide a new merge option, GIT_MERGE_TREE_FAIL_ON_CONFLICT, which will stop on the first conflict and fail the merge operation with GIT_EMERGECONFLICT.
Edward Thomson 6c014bcc 2015-09-29T12:18:17 diff: don't feed large files to xdiff
Edward Thomson e4352066 2015-09-28T18:25:24 merge_file: treat large files as binary xdiff craps the bed on large files. Treat very large files as binary, so that it doesn't even have to try. Refactor our merge binary handling to better match git.git, which looks for a NUL in the first 8000 bytes.
Edward Thomson 56ed415a 2015-08-30T19:10:00 diff: drop `FILELIST_MATCH` Now that non-pathspec matching diffs are implemented at the iterator level, drop `FILELIST_MATCH`ing.
Edward Thomson 4a0dbeb0 2015-08-30T17:06:26 diff: use new iterator pathlist handling When using literal pathspecs in diff with `GIT_DIFF_DISABLE_PATHSPEC_MATCH` turn on the faster iterator pathlist handling. Updates iterator pathspecs to include directory prefixes (eg, `foo/`) for compatibility with `GIT_DIFF_DISABLE_PATHSPEC_MATCH`.
Edward Thomson ef206124 2015-07-28T19:55:37 Move filelist into the iterator handling itself.
Edward Thomson ed1c6446 2015-07-28T11:41:27 iterator: use an options struct instead of args
Matthew Plough 768f8be3 2015-06-30T19:00:41 Fix #3094 - improve use of portable size_t/ssize_t format specifiers. The header src/cc-compat.h defines portable format specifiers PRIuZ, PRIdZ, and PRIxZ. The original report highlighted the need to use these specifiers in examples/network/fetch.c. For this commit, I checked all C source and header files not in deps/ and transitioned to the appropriate format specifier where appropriate.
Edward Thomson 8960dc1e 2015-06-24T18:10:30 iterator: provide git_iterator_walk Provide `git_iterator_walk` to walk each iterator in lockstep, returning each iterator's idea of the contents of the next path.
Carlos Martín Nieto ca2857d8 2015-06-10T10:30:08 merge: actually increment the counts, not the pointers `merge_diff_list_count_candidates()` takes pointers to the source and target counts, but when it comes time to increase them, we're increasing the pointer, rather than the value it's pointing to. Dereference the value to increase.
Edward Thomson 885b94aa 2015-05-28T15:26:13 Rename GIT_EMERGECONFLICT to GIT_ECONFLICT We do not error on "merge conflicts"; on the contrary, merge conflicts are a normal part of merging. We only error on "checkout conflicts", where a change exists in the index or the working directory that would otherwise be overwritten by performing the checkout. This *may* happen during merge (after the production of the new index that we're going to checkout) but it could happen during any checkout.
Edward Thomson 9f545b9d 2015-05-19T11:23:59 introduce `git_index_entry_is_conflict` It's not always obvious the mapping between stage level and conflict-ness. More importantly, this can lead otherwise sane people to write constructs like `if (!git_index_entry_stage(entry))`, which (while technically correct) is unreadable. Provide a nice method to help avoid such messy thinking.
Edward Thomson 9ebb5a3f 2015-02-18T22:53:40 merge: merge iterators
Edward Thomson 89ba9f1a 2015-03-18T13:17:04 Merge pull request #2967 from jacquesg/merge-whitespace Allow merges of files (and trees) with whitespace problems/fixes
Jeff Hostetler fea24c53 2015-03-16T15:54:53 PERF: In MERGE, lazily compute is_binary
Jacques Germishuys 13de9363 2015-03-12T12:36:09 Collapse whitespace flags into git_merge_file_flags_t
Jacques Germishuys f29dde68 2015-03-12T12:29:47 Renamed git_merge_options 'flags' to 'tree_flags'
Jacques Germishuys 45a86bbf 2015-03-09T17:02:52 Allow for merges with whitespace discrepancies
Carlos Martín Nieto a291790a 2015-02-15T05:18:01 Merge pull request #2831 from ethomson/merge_lock merge: lock index during the merge (not just checkout)
Edward Thomson 41fae48d 2015-02-03T22:31:10 indexwriter: an indexwriter for repo operations Provide git_indexwriter_init_for_operation for the common locking pattern in merge, rebase, revert and cherry-pick.
Edward Thomson 8b0ddd5d 2015-01-17T23:28:53 merge: lock the index at the start of the merge Always lock the index when we begin the merge, before we write any of the metdata files. This prevents a race where another client may run a commit after we have written the MERGE_HEAD but before we have updated the index, which will produce a merge commit that is treesame to one parent. The merge will finish and update the index and the resultant commit would not be a merge at all.
Edward Thomson f1453c59 2015-02-12T12:19:37 Make our overflow check look more like gcc/clang's Make our overflow checking look more like gcc and clang's, so that we can substitute it out with the compiler instrinsics on platforms that support it. This means dropping the ability to pass `NULL` as an out parameter. As a result, the macros also get updated to reflect this as well.
Edward Thomson 392702ee 2015-02-09T23:41:13 allocations: test for overflow of requested size Introduce some helper macros to test integer overflow from arithmetic and set error message appropriately.
Edward Thomson 85880693 2015-01-14T10:19:28 Merge branch 'pr/2740'
Pierre-Olivier Latour b3837d4d 2014-12-02T05:47:32 Always use GIT_HASHSIG_SMART_WHITESPACE when diffing for merges git_merge_tree_flag_t cannot contain any GIT_DIFF_FIND_xxx flags so there's not point in checking for them
Jacques Germishuys 6f73e026 2014-12-24T11:42:50 Plug some leaks
Edward Thomson 18b00406 2014-10-03T19:02:29 s/git_merge_head/git_annotated_commit Rename git_merge_head to git_annotated_commit, as it becomes used in more operations than just merge.
Edward Thomson 867a36f3 2014-07-14T14:35:01 Introduce git_rebase to set up a rebase session Introduce `git_rebase` to set up a rebase session that can then be continued. Immediately, only merge-type rebase is supported.
Arthur Schreiber 917f85a1 2014-10-09T14:16:10 Extract shared functionality.
Arthur Schreiber eca07bcd 2014-10-09T13:58:23 Add git_merge_bases_many.
Vicent Marti 737b5051 2014-10-01T12:03:24 hashsig: Export as a `sys` header
Jacques Germishuys dc68ee8d 2014-09-12T22:37:15 Remove local unused index_repo variable
Jacques Germishuys a565f364 2014-09-12T22:53:56 Only check for workdir conflicts if the index has merged files Passing 0 as the length of the paths to check to git_diff_index_to_workdir results in all files being treated as conflicting, that is, all untracked or modified files in the worktree is reported as conflicting
Vicent Marti 46a13f32 2014-08-29T18:19:56 Merge pull request #2481 from libgit2/cmn/oidarray merge: expose multiple merge bases
Arthur Schreiber 017c0eac 2014-08-25T22:41:07 merge base: Correctly raise an error if a non-commit object is passed.
Carlos Martín Nieto 7db0e6ee 2014-07-18T16:00:21 merge: expose multiple merge bases We always calculate multiple merge bases, but up to now we had only exposed the "best" merge base. Introduce git_oidarray which analogously to git_strarray lets us return multiple ids.
Edward Thomson 994404b5 2014-07-17T01:25:31 Don't allow conflicts by default
Edward Thomson 02bf955f 2014-07-02T15:42:15 merge: don't open COMMIT_MSG unless we need to append conflicts
Edward Thomson 967f5a76 2014-05-23T14:50:51 git_checkout_index: checkout other indexes git_checkout_index can now check out other git_index's (that are not necessarily the repository index). This allows checkout_index to use the repository's index for stat cache information instead of the index data being checked out. git_merge and friends now check out their indexes directly instead of trying to blend it into the running index.
Edward Thomson eff531e1 2014-05-27T20:58:20 Modify GIT_MERGE_CONFIG -> GIT_MERGE_PREFERENCE
Edward Thomson de3f851e 2014-05-21T09:44:05 Staticify `merge_config`
Edward Thomson 22ab8881 2014-05-20T22:07:15 Use a config snapshot
Edward Thomson a3622ba6 2014-05-16T13:54:40 Move GIT_MERGE_CONFIG_* to its own enum
Edward Thomson d362093f 2014-05-08T15:41:36 Introduce GIT_MERGE_CONFIG_* for merge.ff settings git_merge_analysis will now return GIT_MERGE_CONFIG_NO_FASTFORWARD when merge.ff=false and GIT_MERGE_CONFIG_FASTFORWARD_ONLY when merge.ff=true
Russell Belfer 702efc89 2014-04-30T10:57:42 Make init_options fns use unsigned ints and macro Use an unsigned int for the version and add a helper macro so the code is simplified (and so the error message is a common string).
Edward Thomson a4e2c36a 2014-04-23T19:40:21 merge: checkout default shouldn't clobber given
Edward Thomson 26564d80 2014-04-23T19:26:58 merge: default checkout strategy for should be SAFE
Russell Belfer 8a2834d3 2014-03-14T13:20:51 Index locking and entry allocation changes This makes the lock management on the index a little bit broader, having a number of routines hold the lock across looking up the item to be modified and actually making the modification. Still not true thread safety, but more pure index modifications are now safe which allows the simple cases (such as starting up a diff while index modifications are underway) safe enough to get the snapshot without hitting allocation problems. As part of this, I simplified the allocation of index entries to use a flex array and just put the path at the end of the index entry. This makes every entry self-contained and makes it a little easier to feel sure that pointers to strings aren't being accidentally copied and freed while other references are still being held.
Russell Belfer 3b4c401a 2014-02-10T13:20:08 Decouple index iterator sort from index This makes the index iterator honor the GIT_ITERATOR_IGNORE_CASE and GIT_ITERATOR_DONT_IGNORE_CASE flags without modifying the index data itself. To take advantage of this, I had to export a number of the internal index entry comparison functions. I also wrote some new tests to exercise the capability.
Russell Belfer c67fd4c9 2014-02-07T11:20:36 Some vector utility tweaks This is just laying some groundwork for internal index changes that I'm working on.
Jacques Germishuys 6fefb7af 2014-04-13T19:53:35 Capture conflict information in MERGE_MSG for revert and merge
Jacques Germishuys 399f2b62 2014-04-07T20:15:45 Introduce git_merge__extract_conflict_paths
Jacques Germishuys 3b4ba278 2014-04-03T15:50:21 Const correctness!
Edward Thomson 976634c4 2014-03-30T19:56:18 Introduce git_merge_head_id