| Commit message (Collapse) | Author | Age | Files | Lines |
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Start working to make the codebase buildable with -Wsign-compare.
* ps/build-sign-compare:
t/helper: don't depend on implicit wraparound
scalar: address -Wsign-compare warnings
builtin/patch-id: fix type of `get_one_patchid()`
builtin/blame: fix type of `length` variable when emitting object ID
gpg-interface: address -Wsign-comparison warnings
daemon: fix type of `max_connections`
daemon: fix loops that have mismatching integer types
global: trivial conversions to fix `-Wsign-compare` warnings
pkt-line: fix -Wsign-compare warning on 32 bit platform
csum-file: fix -Wsign-compare warning on 32-bit platform
diff.h: fix index used to loop through unsigned integer
config.mak.dev: drop `-Wno-sign-compare`
global: mark code units that generate warnings with `-Wsign-compare`
compat/win32: fix -Wsign-compare warning in "wWinMain()"
compat/regex: explicitly ignore "-Wsign-compare" warnings
git-compat-util: introduce macros to disable "-Wsign-compare" warnings
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Mark code units that generate warnings with `-Wsign-compare`. This
allows for a structured approach to get rid of all such warnings over
time in a way that can be easily measured.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Yet another "pass the repository through the callchain" topic.
* kn/midx-wo-the-repository:
midx: inline the `MIDX_MIN_SIZE` definition
midx: pass down `hash_algo` to functions using global variables
midx: pass `repository` to `load_multi_pack_index`
midx: cleanup internal usage of `the_repository` and `the_hash_algo`
midx-write: pass down repository to `write_midx_file[_only]`
write-midx: add repository field to `write_midx_context`
midx-write: use `revs->repo` inside `read_refs_snapshot`
midx-write: pass down repository to static functions
packfile.c: remove unnecessary prepare_packed_git() call
midx: add repository to `multi_pack_index` struct
config: make `packed_git_(limit|window_size)` non-global variables
config: make `delta_base_cache_limit` a non-global variable
packfile: pass down repository to `for_each_packed_object`
packfile: pass down repository to `has_object[_kept]_pack`
packfile: pass down repository to `odb_pack_name`
packfile: pass `repository` to static function in the file
packfile: use `repository` from `packed_git` directly
packfile: add repository to struct `packed_git`
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* kn/the-repository:
packfile.c: remove unnecessary prepare_packed_git() call
midx: add repository to `multi_pack_index` struct
config: make `packed_git_(limit|window_size)` non-global variables
config: make `delta_base_cache_limit` a non-global variable
packfile: pass down repository to `for_each_packed_object`
packfile: pass down repository to `has_object[_kept]_pack`
packfile: pass down repository to `odb_pack_name`
packfile: pass `repository` to static function in the file
packfile: use `repository` from `packed_git` directly
packfile: add repository to struct `packed_git`
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The function `for_each_packed_object` currently relies on the global
variable `the_repository`. To eliminate global variable usage in
`packfile.c`, we should progressively shift the dependency on
the_repository to higher layers. Let's remove its usage from this
function and closely related function `is_promisor_object`.
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The functions `has_object[_kept]_pack` currently rely on the global
variable `the_repository`. To eliminate global variable usage in
`packfile.c`, we should progressively shift the dependency on
the_repository to higher layers. Let's remove its usage from these
functions and any related ones.
Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Even though `read_bisect_terms()` is declared as assigning string
constants, it in fact assigns allocated strings to the `read_bad` and
`read_good` out parameters. The only callers of this function assign the
result to global variables and thus don't have to free them in order to
be leak-free. But that changes when executing the function multiple
times because we'd then overwrite the previous value and thus make it
unreachable.
Fix the function signature and free the previous values. This leak is
exposed by t0630, but plugging it does not make the whole test suite
pass.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The memory allocated by `prepare_to_use_bloom_filter()` is not released
by `release_revisions()`, causing a memory leak. Plug it.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `saved_parents` slab is used by `--full-diff` to save parents of a
commit which we are about to rewrite. We do not release its contents
once it's not used anymore, causing a memory leak. Plug it.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Both `rewrite_parents()` and `remove_duplicate_parents()` may end up
dropping some parents from a commit without freeing the respective
`struct commit_list` items. This causes a bunch of memory leaks. Plug
these.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When simplifying commits, e.g. because they are treesame with their
parents, we unset the commit's parent pointers but never free them. Plug
the resulting memory leaks.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The code forgot to discard unnecessary in-core commit buffer data
for commits that "git log --skip=<number>" traversed but omitted
from the output, which has been corrected.
* jk/free-commit-buffer-of-skipped-commits:
revision: free commit buffers for skipped commits
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In git-log we leave the save_commit_buffer flag set to "1", which tells
the commit parsing code to store the object content after it has parsed
it to find parents, tree, etc. That lets us reuse the contents for
pretty-printing the commit in the output. And then after printing each
commit, we call free_commit_buffer(), since we don't need it anymore.
But some options may cause us to traverse commits which are not part of
the output. And so git-log does not see them at all, and doesn't free
them. One such case is something like:
git log -n 1000 --skip=1000000
which will churn through a million commits, before showing only a
thousand. We loop through these inside get_revision(), without freeing
the contents. As a result, we end up storing the object data for those
million commits simultaneously.
We should free the stored buffers (if any) for those commits as we skip
over them, which is what this patch does. Running the above command in
linux.git drops the peak heap usage from ~1.1GB to ~200MB, according to
valgrind/massif. (I thought we might get an even bigger improvement, but
the remaining memory is going to commit/tree structs, which we do hold
on to forever).
Note that this problem doesn't occur if:
- you're running a git-rev-list without a --format parameter; it turns
off save_commit_buffer by default, since it only output the object
id
- you've built a commit-graph file, since in that case we'd use the
optimized graph data instead of the initial parse, and then do a
lazy parse for commits we're actually going to output
There are probably some other option combinations that can likewise
end up with useless stored commit buffers. For example, if you ask for
"foo..bar", then we'll have to walk down to the merge base, and
everything on the "foo" side won't be shown. Tuning the "save" behavior
to handle that might be tricky (I guess maybe drop buffers for anything
we mark as UNINTERESTING?). And in the long run, the right solution here
is probably to make sure the commit-graph is built (since it fixes the
memory problem _and_ drastically reduces CPU usage).
But since this "--skip" case is an easy one-liner, it's worth fixing in
the meantime. It should be OK to make this call even if there is no
saved buffer (e.g., because save_commit_buffer=0, or because a
commit-graph was used), since it's O(1) to look up the buffer and is a
noop if it isn't present. I verified by running the above command after
"git commit-graph write --reachable", and it takes the same time with
and without this patch.
Reported-by: Yuri Karnilaev <karnilaev@gmail.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Use of API functions that implicitly depend on the_repository
object in the config subsystem has been rewritten to pass a
repository object through the callchain.
* ps/config-wo-the-repository:
config: hide functions using `the_repository` by default
global: prepare for hiding away repo-less config functions
config: don't depend on `the_repository` with branch conditions
config: don't have setters depend on `the_repository`
config: pass repo to functions that rename or copy sections
config: pass repo to `git_die_config()`
config: pass repo to `git_config_get_expiry_in_days()`
config: pass repo to `git_config_get_expiry()`
config: pass repo to `git_config_get_max_percent_split_change()`
config: pass repo to `git_config_get_split_index()`
config: pass repo to `git_config_get_index_threads()`
config: expose `repo_config_clear()`
config: introduce missing setters that take repo as parameter
path: hide functions using `the_repository` by default
path: stop relying on `the_repository` in `worktree_git_path()`
path: stop relying on `the_repository` when reporting garbage
hooks: remove implicit dependency on `the_repository`
editor: do not rely on `the_repository` for interactive edits
path: expose `do_git_common_path()` as `repo_common_pathv()`
path: expose `do_git_path()` as `repo_git_pathv()`
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When not provided a worktree, then `worktree_git_path()` will fall back
to returning a path relative to the main repository. In this case, we
implicitly rely on `the_repository` to derive the path. Remove this
dependency by passing a `struct repository` as parameter.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Add a parameter to each_ref_fn so that callers to the ref APIs
that use this function as a callback can have acess to the
unresolved value of a symbolic ref.
Signed-off-by: John Cai <johncai86@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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More memory leaks have been plugged.
* ps/leakfixes-more: (29 commits)
builtin/blame: fix leaking ignore revs files
builtin/blame: fix leaking prefixed paths
blame: fix leaking data for blame scoreboards
line-range: plug leaking find functions
merge: fix leaking merge bases
builtin/merge: fix leaking `struct cmdnames` in `get_strategy()`
sequencer: fix memory leaks in `make_script_with_merges()`
builtin/clone: plug leaking HEAD ref in `wanted_peer_refs()`
apply: fix leaking string in `match_fragment()`
sequencer: fix leaking string buffer in `commit_staged_changes()`
commit: fix leaking parents when calling `commit_tree_extended()`
config: fix leaking "core.notesref" variable
rerere: fix various trivial leaks
builtin/stash: fix leak in `show_stash()`
revision: free diff options
builtin/log: fix leaking commit list in git-cherry(1)
merge-recursive: fix memory leak when finalizing merge
builtin/merge-recursive: fix leaking object ID bases
builtin/difftool: plug memory leaks in `run_dir_diff()`
object-name: free leaking object contexts
...
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There is a todo comment in `release_revisions()` that mentions that we
need to free the diff options, which was added via 54c8a7c379 (revisions
API: add a TODO for diff_free(&revs->diffopt), 2022-04-14). Releasing
the diff options wasn't quite feasible at that time because some call
sites rely on its contents to remain even after the revisions have been
released.
In fact, there really only are a couple of callsites that misbehave
here:
- `cmd_shortlog()` releases the revisions, but continues to access its
file pointer.
- `do_diff_cache()` creates a shallow copy of `struct diff_options`,
but does not set the `no_free` member. Consequently, we end up
releasing resources of the caller-provided diff options.
- `diff_free()` and friends do not play nice when being called
multiple times as they don't unset data structures that they have
just released.
Fix all of those cases and enable the call to `diff_free()`, which plugs
a bunch of memory leaks.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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While it is documented in `struct object_context::path` that this
variable needs to be released by the caller, this fact is rather easy to
miss given that we do not ever provide a function to release the object
context. And of course, while some callers dutifully release the path,
many others don't.
Introduce a new `object_context_release()` function that releases the
path. Convert callsites that used to free the path to use that new
function and add missing calls to callsites that were leaking memory.
Refactor those callsites as required to have a single return path, only.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We never free the display notes options embedded into `struct revision`.
Implement a new function `release_display_notes()` that we can call in
`release_revisions()` to fix this.
There is another gotcha here though: we play some games with the string
list used to track extra notes refs, where we sometimes set the bit that
indicates that strings should be strdup'd and sometimes unset it. This
dance is done to avoid a copy of an already-allocated string when we
call `enable_ref_display_notes()`. But this dance is rather pointless as
we can instead call `string_list_append_nodup()` to transfer ownership
of the allocated string to the list.
Refactor the code to do so and drop the `strdup_strings` dance.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When reversing revisions in a rev walk, `get_revision()` will allocate a
new commit list and assign it to `revs->commits`. It does not free the
old list though, which makes it leak. Fix this.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The Bloom filter used for path limited history traversal was broken
on systems whose "char" is unsigned; update the implementation and
bump the format version to 2.
* tb/path-filter-fix:
bloom: introduce `deinit_bloom_filters()`
commit-graph: reuse existing Bloom filters where possible
object.h: fix mis-aligned flag bits table
commit-graph: new Bloom filter version that fixes murmur3
commit-graph: unconditionally load Bloom filters
bloom: prepare to discard incompatible Bloom filters
bloom: annotate filters with hash version
repo-settings: introduce commitgraph.changedPathsVersion
t4216: test changed path filters with high bit paths
t/helper/test-read-graph: implement `bloom-filters` mode
bloom.h: make `load_bloom_filter_from_graph()` public
t/helper/test-read-graph.c: extract `dump_graph_info()`
gitformat-commit-graph: describe version 2 of BDAT
commit-graph: ensure Bloom filters are read with consistent settings
revision.c: consult Bloom filters for root commits
t/t4216-log-bloom.sh: harden `test_bloom_filters_not_used()`
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The commit-graph stores changed-path Bloom filters which represent the
set of paths included in a tree-level diff between a commit's root tree
and that of its parent.
When a commit has no parents, the tree-diff is computed against that
commit's root tree and the empty tree. In other words, every path in
that commit's tree is stored in the Bloom filter (since they all appear
in the diff).
Consult these filters during pathspec-limited traversals in the function
`rev_same_tree_as_empty()`. Doing so yields a performance improvement
where we can avoid enumerating the full set of paths in a parentless
commit's root tree when we know that the path(s) of interest were not
listed in that commit's changed-path Bloom filter.
Suggested-by: SZEDER Gábor <szeder.dev@gmail.com>
Original-patch-by: Jonathan Tan <jonathantanmy@google.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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A CPP macro USE_THE_REPOSITORY_VARIABLE is introduced to help
transition the codebase to rely less on the availability of the
singleton the_repository instance.
* ps/use-the-repository:
hex: guard declarations with `USE_THE_REPOSITORY_VARIABLE`
t/helper: remove dependency on `the_repository` in "proc-receive"
t/helper: fix segfault in "oid-array" command without repository
t/helper: use correct object hash in partial-clone helper
compat/fsmonitor: fix socket path in networked SHA256 repos
replace-object: use hash algorithm from passed-in repository
protocol-caps: use hash algorithm from passed-in repository
oidset: pass hash algorithm when parsing file
http-fetch: don't crash when parsing packfile without a repo
hash-ll: merge with "hash.h"
refs: avoid include cycle with "repository.h"
global: introduce `USE_THE_REPOSITORY_VARIABLE` macro
hash: require hash algorithm in `empty_tree_oid_hex()`
hash: require hash algorithm in `is_empty_{blob,tree}_oid()`
hash: make `is_null_oid()` independent of `the_repository`
hash: convert `oidcmp()` and `oideq()` to compare whole hash
global: ensure that object IDs are always padded
hash: require hash algorithm in `oidread()` and `oidclr()`
hash: require hash algorithm in `hasheq()`, `hashcmp()` and `hashclr()`
hash: drop (mostly) unused `is_empty_{blob,tree}_sha1()` functions
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Use of the `the_repository` variable is deprecated nowadays, and we
slowly but steadily convert the codebase to not use it anymore. Instead,
callers should be passing down the repository to work on via parameters.
It is hard though to prove that a given code unit does not use this
variable anymore. The most trivial case, merely demonstrating that there
is no direct use of `the_repository`, is already a bit of a pain during
code reviews as the reviewer needs to manually verify claims made by the
patch author. The bigger problem though is that we have many interfaces
that implicitly rely on `the_repository`.
Introduce a new `USE_THE_REPOSITORY_VARIABLE` macro that allows code
units to opt into usage of `the_repository`. The intent of this macro is
to demonstrate that a certain code unit does not use this variable
anymore, and to keep it from new dependencies on it in future changes,
be it explicit or implicit
For now, the macro only guards `the_repository` itself as well as
`the_hash_algo`. There are many more known interfaces where we have an
implicit dependency on `the_repository`, but those are not guarded at
the current point in time. Over time though, we should start to add
guards as required (or even better, just remove them).
Define the macro as required in our code units. As expected, most of our
code still relies on the global variable. Nearly all of our builtins
rely on the variable as there is no way yet to pass `the_repository` to
their entry point. For now, declare the macro in "biultin.h" to keep the
required changes at least a little bit more contained.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Code cleanup.
* jc/worktree-git-path:
worktree_git_path(): move the declaration to path.h
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The definition of this function is in path.c but its declaration is
in worktree.h, which is something unexpected. The function is
explained as "Similar to git_path()"; declaring it next to where
git_path() is declared would make more sense.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The `git_log_output_encoding` variable can be set via the `--encoding=`
option. When doing so, we conditionally either assign it to the passed
value, or if the value is "none" we assign it the empty string.
Depending on which of the both code paths we pick though, the variable
may end up being assigned either an allocated string or a string
constant.
This is somewhat risky and may easily lead to bugs when a different code
path may want to reassign a new value to it, freeing the previous value.
We already to this when parsing the "i18n.logoutputencoding" config in
`git_default_i18n_config()`. But because the config is typically parsed
before we parse command line options this has been fine so far.
Regardless of that, safeguard the code such that the variable always
contains an allocated string. While at it, also free the old value in
case there was any to plug a potential memory leak.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Apply the rules that rewrite callers of "refs" interfaces to explicitly
pass `struct ref_store`. The resulting patch has been applied with the
`--whitespace=fix` option.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Work to support a repository that work with both SHA-1 and SHA-256
hash algorithms has started.
* eb/hash-transition: (30 commits)
t1016-compatObjectFormat: add tests to verify the conversion between objects
t1006: test oid compatibility with cat-file
t1006: rename sha1 to oid
test-lib: compute the compatibility hash so tests may use it
builtin/ls-tree: let the oid determine the output algorithm
object-file: handle compat objects in check_object_signature
tree-walk: init_tree_desc take an oid to get the hash algorithm
builtin/cat-file: let the oid determine the output algorithm
rev-parse: add an --output-object-format parameter
repository: implement extensions.compatObjectFormat
object-file: update object_info_extended to reencode objects
object-file-convert: convert commits that embed signed tags
object-file-convert: convert commit objects when writing
object-file-convert: don't leak when converting tag objects
object-file-convert: convert tag objects when writing
object-file-convert: add a function to convert trees between algorithms
object: factor out parse_mode out of fast-import and tree-walk into in object.h
cache: add a function to read an OID of a specific algorithm
tag: sign both hashes
commit: export add_header_signature to support handling signatures on tags
...
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To make it possible for git ls-tree to display the tree encoded
in the hash algorithm of the oid specified to git ls-tree, update
init_tree_desc to take as a parameter the oid of the tree object.
Update all callers of init_tree_desc and init_tree_desc_gently
to pass the oid of the tree object.
Use the oid of the tree object to discover the hash algorithm
of the oid and store that hash algorithm in struct tree_desc.
Use the hash algorithm in decode_tree_entry and
update_tree_entry_internal to handle reading a tree object encoded in
a hash algorithm that differs from the repositories hash algorithm.
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Error message updates.
* as/option-names-in-messages:
revision.c: trivial fix to message
builtin/clone.c: trivial fix of message
builtin/remote.c: trivial fix of error message
transport-helper.c: trivial fix of error message
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ancestry-path is an option, not a command - mark it as such.
This brings it in sync with the rest of usages in the file
Signed-off-by: Alexander Shopov <ash@kambanaria.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove unused header "#include".
* en/header-cleanup:
treewide: remove unnecessary includes in source files
treewide: add direct includes currently only pulled in transitively
trace2/tr2_tls.h: remove unnecessary include
submodule-config.h: remove unnecessary include
pkt-line.h: remove unnecessary include
line-log.h: remove unnecessary include
http.h: remove unnecessary include
fsmonitor--daemon.h: remove unnecessary includes
blame.h: remove unnecessary includes
archive.h: remove unnecessary include
treewide: remove unnecessary includes in source files
treewide: remove unnecessary includes from header files
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Clean-up code that handles combinations of incompatible options.
* rs/incompatible-options-messages:
worktree: simplify incompatibility message for --orphan and commit-ish
worktree: standardize incompatibility messages
clean: factorize incompatibility message
revision, rev-parse: factorize incompatibility messages about - -exclude-hidden
revision: use die_for_incompatible_opt3() for - -graph/--reverse/--walk-reflogs
repack: use die_for_incompatible_opt3() for -A/-k/--cruft
push: use die_for_incompatible_opt4() for - -delete/--tags/--all/--mirror
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Clean-up code that handles combinations of incompatible options.
* rs/i18n-cannot-be-used-together:
i18n: factorize even more 'incompatible options' messages
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The command line parser for the "log" family of commands was too
loose when parsing certain numbers, e.g., silently ignoring the
extra 'q' in "git log -n 1q" without complaining, which has been
tightened up.
* jc/revision-parse-int:
revision: parse integer arguments to --max-count, --skip, etc., more carefully
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Make sure failure return from merge_bases_many() is properly caught.
* js/merge-base-with-missing-commit:
merge-ort/merge-recursive: do report errors in `merge_submodule()`
merge-recursive: prepare for `merge_submodule()` to report errors
commit-reach(repo_get_merge_bases_many_dirty): pass on errors
commit-reach(repo_get_merge_bases_many): pass on "missing commits" errors
commit-reach(get_octopus_merge_bases): pass on "missing commits" errors
commit-reach(repo_get_merge_bases): pass on "missing commits" errors
commit-reach(get_merge_bases_many_0): pass on "missing commits" errors
commit-reach(merge_bases_many): pass on "missing commits" errors
commit-reach(paint_down_to_common): start reporting errors
commit-reach(paint_down_to_common): prepare for handling shallow commits
commit-reach(repo_in_merge_bases_many): report missing commits
commit-reach(repo_in_merge_bases_many): optionally expect missing commits
commit-reach(paint_down_to_common): plug two memory leaks
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The `merge_bases_many()` function was just taught to indicate parsing
errors, and now the `repo_get_merge_bases()` function (which is also
surfaced via the `repo_get_merge_bases()` macro) is aware of that, too.
Naturally, there are a lot of callers that need to be adjusted now, too.
Next step: adjust the callers of `get_octopus_merge_bases()`.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Various parts of upload-pack has been updated to bound the resource
consumption relative to the size of the repository to protect from
abusive clients.
* jk/upload-pack-bounded-resources:
upload-pack: free tree buffers after parsing
upload-pack: use PARSE_OBJECT_SKIP_HASH_CHECK in more places
upload-pack: always turn off save_commit_buffer
upload-pack: disallow object-info capability by default
upload-pack: accept only a single packfile-uri line
upload-pack: use a strmap for want-ref lines
upload-pack: use oidset for deepen_not list
upload-pack: switch deepen-not list to an oid_array
upload-pack: drop separate v2 "haves" array
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When a client sends us a "want" or "have" line, we call parse_object()
to get an object struct. If the object is a tree, then the parsed state
means that tree->buffer points to the uncompressed contents of the tree.
But we don't really care about it. We only really need to parse commits
and tags; for trees and blobs, the important output is just a "struct
object" with the correct type.
But much worse, we do not ever free that tree buffer. It's not leaked in
the traditional sense, in that we still have a pointer to it from the
global object hash. But if the client requests many trees, we'll hold
all of their contents in memory at the same time.
Nobody really noticed because it's rare for clients to directly request
a tree. It might happen for a lightweight tag pointing straight at a
tree, or it might happen for a "tree:depth" partial clone filling in
missing trees.
But it's also possible for a malicious client to request a lot of trees,
causing upload-pack's memory to balloon. For example, without this
patch, requesting every tree in git.git like:
pktline() {
local msg="$*"
printf "%04x%s\n" $((1+4+${#msg})) "$msg"
}
want_trees() {
pktline command=fetch
printf 0001
git cat-file --batch-all-objects --batch-check='%(objectname) %(objecttype)' |
while read oid type; do
test "$type" = "tree" || continue
pktline want $oid
done
pktline done
printf 0000
}
want_trees | GIT_PROTOCOL=version=2 valgrind --tool=massif ./git upload-pack . >/dev/null
shows a peak heap usage of ~3.7GB. Which is just about the sum of the
sizes of all of the uncompressed trees. For linux.git, it's closer to
17GB.
So the obvious thing to do is to call free_tree_buffer() after we
realize that we've parsed a tree. We know that upload-pack won't need it
later. But let's push the logic into parse_object_with_flags(), telling
it to discard the tree buffer immediately. There are two reasons for
this. One, all of the relevant call-sites already call the with_options
variant to pass the SKIP_HASH flag. So it actually ends up as less code
than manually free-ing in each spot. And two, it enables an extra
optimization that I'll discuss below.
I've touched all of the sites that currently use SKIP_HASH in
upload-pack. That drops the peak heap of the upload-pack invocation
above from 3.7GB to ~24MB.
I've also modified the caller in get_reference(); a partial clone
benefits from its use in pack-objects for the reasons given in
0bc2557951 (upload-pack: skip parse-object re-hashing of "want" objects,
2022-09-06), where we were measuring blob requests. But note that the
results of get_reference() are used for traversing, as well; so we
really would _eventually_ use the tree contents. That makes this at
first glance a space/time tradeoff: we won't hold all of the trees in
memory at once, but we'll have to reload them each when it comes time to
traverse.
And here's where our extra optimization comes in. If the caller is not
going to immediately look at the tree contents, and it doesn't care
about checking the hash, then parse_object() can simply skip loading the
tree entirely, just like we do for blobs! And now it's not a space/time
tradeoff in get_reference() anymore. It's just a lazy-load: we're
delaying reading the tree contents until it's time to actually traverse
them one by one.
And of course for upload-pack, this optimization means we never load the
trees at all, saving lots of CPU time. Timing the "every tree from
git.git" request above shows upload-pack dropping from 32 seconds of CPU
to 19 (the remainder is mostly due to pack-objects actually sending the
pack; timing just the upload-pack portion shows we go from 13s to
~0.28s).
These are all highly gamed numbers, of course. For real-world
partial-clone requests we're saving only a small bit of time in
practice. But it does help harden upload-pack against malicious
denial-of-service attacks.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git log --merge" learned to pay attention to CHERRY_PICK_HEAD and
other kinds of *_HEAD pseudorefs.
* ml/log-merge-with-cherry-pick-and-other-pseudo-heads:
revision: implement `git log --merge` also for rebase/cherry-pick/revert
revision: ensure MERGE_HEAD is a ref in prepare_show_merge
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'git log' learned in ae3e5e1ef2 (git log -p --merge [[--] paths...],
2006-07-03) to show commits touching conflicted files in the range
HEAD...MERGE_HEAD, an addition documented in d249b45547 (Document
rev-list's option --merge, 2006-08-04).
It can be useful to look at the commit history to understand what lead
to merge conflicts also for other mergy operations besides merges, like
cherry-pick, revert and rebase.
For rebases and cherry-picks, an interesting range to look at is
HEAD...{REBASE_HEAD,CHERRY_PICK_HEAD}, since even if all the commits
included in that range are not directly part of the 3-way merge,
conflicts encountered during these operations can indeed be caused by
changes introduced in preceding commits on both sides of the history.
For revert, as we are (most likely) reversing changes from a previous
commit, an appropriate range is REVERT_HEAD..HEAD, which is equivalent
to REVERT_HEAD...HEAD and to HEAD...REVERT_HEAD, if we keep HEAD and its
parents on the left side of the range.
As such, adjust the code in prepare_show_merge so it constructs the
range HEAD...$OTHER for OTHER={MERGE_HEAD, CHERRY_PICK_HEAD, REVERT_HEAD
or REBASE_HEAD}. Note that we try these pseudorefs in order, so keep
REBASE_HEAD last since the three other operations can be performed
during a rebase. Note also that in the uncommon case where $OTHER and
HEAD do not share a common ancestor, this will show the complete
histories of both sides since their root commits, which is the same
behaviour as currently happens in that case for HEAD and MERGE_HEAD.
Adjust the documentation of this option accordingly.
Co-authored-by: Johannes Sixt <j6t@kdbg.org>
Co-authored-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Michael Lohmann <mi.al.lohmann@gmail.com>
[jc: tweaked in j6t's precedence fix that tries REBASE_HEAD last]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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This is done to
(1) ensure MERGE_HEAD is a ref,
(2) obtain the oid without any prefixing by refs.c:repo_dwim_ref()
(3) error out when MERGE_HEAD is a symref.
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Michael Lohmann <mi.al.lohmann@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Philippe Blain <levraiphilippeblain@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git rev-list --missing=print" has learned to optionally take
"--allow-missing-tips", which allows the objects at the starting
points to be missing.
* cc/rev-list-allow-missing-tips:
revision: fix --missing=[print|allow*] for annotated tags
rev-list: allow missing tips with --missing=[print|allow*]
t6022: fix 'test' style and 'even though' typo
oidset: refactor oidset_insert_from_set()
revision: clarify a 'return NULL' in get_reference()
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In 9830926c7d (rev-list: add commit object support in `--missing`
option, 2023-10-27) we fixed the `--missing` option in `git rev-list`
so that it works with missing commits, not just blobs/trees.
Unfortunately, such a command was still failing with a "fatal: bad
object <oid>" if it was passed a missing commit, blob or tree as an
argument (before the rev walking even begins). This was fixed in a
recent commit.
That fix still doesn't work when an argument passed to the command is
an annotated tag pointing to a missing commit though. In that case
`git rev-list --missing=...` still errors out with a "fatal: bad
object <oid>" error where <oid> is the object ID of the missing
commit.
Let's fix this issue, and also, while at it, let's add tests not just
for annotated tags but also for regular tags and branches.
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In 9830926c7d (rev-list: add commit object support in `--missing`
option, 2023-10-27) we fixed the `--missing` option in `git rev-list`
so that it works with with missing commits, not just blobs/trees.
Unfortunately, such a command would still fail with a "fatal: bad
object <oid>" if it is passed a missing commit, blob or tree as an
argument (before the rev walking even begins).
When such a command is used to find the dependencies of some objects,
for example the dependencies of quarantined objects (see the
"QUARANTINE ENVIRONMENT" section in the git-receive-pack(1)
documentation), it would be better if the command would instead
consider such missing objects, especially commits, in the same way as
other missing objects.
If, for example `--missing=print` is used, it would be nice for some
use cases if the missing tips passed as arguments were reported in
the same way as other missing objects instead of the command just
failing.
We could introduce a new option to make it work like this, but most
users are likely to prefer the command to have this behavior as the
default one. Introducing a new option would require another dumb loop
to look for that option early, which isn't nice.
Also we made `git rev-list` work with missing commits very recently
and the command is most often passed commits as arguments. So let's
consider this as a bug fix related to these recent changes.
While at it let's add a NEEDSWORK comment to say that we should get
rid of the existing ugly dumb loops that parse the
`--exclude-promisor-objects` and `--missing=...` options early.
Helped-by: Linus Arver <linusa@google.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When we know a pointer variable is NULL, it's clearer to
explicitly return NULL than to return that variable.
In get_reference(), when 'object' is NULL, we already return NULL
when 'revs->exclude_promisor_objects && is_promisor_object(oid)' is
true, but we return 'object' when 'revs->ignore_missing' is true.
Let's make the code clearer and more uniform by also explicitly
returning NULL when 'revs->ignore_missing' is true.
Helped-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Christian Couder <chriscool@tuxfamily.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The ref and reflog iterators share much of the same underlying code to
iterate over the corresponding entries. This results in some weird code
because the reflog iterator also exposes an object ID as well as a flag
to the callback function. Neither of these fields do refer to the reflog
though -- they refer to the corresponding ref with the same name. This
is quite misleading. In practice at least the object ID cannot really be
implemented in any other way as a reflog does not have a specific object
ID in the first place. This is further stressed by the fact that none of
the callbacks except for our test helper make use of these fields.
Split up the infrastucture so that ref and reflog iterators use separate
callback signatures. This allows us to drop the nonsensical fields from
the reflog iterator.
Note that internally, the backends still use the same shared infra to
iterate over both types. As the backends should never end up being
called directly anyway, this is not much of a problem and thus kept
as-is for simplicity's sake.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Remove unused header "#include".
* en/header-cleanup:
treewide: remove unnecessary includes in source files
treewide: add direct includes currently only pulled in transitively
trace2/tr2_tls.h: remove unnecessary include
submodule-config.h: remove unnecessary include
pkt-line.h: remove unnecessary include
line-log.h: remove unnecessary include
http.h: remove unnecessary include
fsmonitor--daemon.h: remove unnecessary includes
blame.h: remove unnecessary includes
archive.h: remove unnecessary include
treewide: remove unnecessary includes in source files
treewide: remove unnecessary includes from header files
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