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The ref storage format is tracked as a simple unsigned integer, which
makes it harder than necessary to discover what that integer actually is
or where its values are defined.
Convert the ref storage format to instead be an enum.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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When reinitializing a repository's version we may end up unsetting the
hash algorithm when it matches the default hash algorithm. If we didn't
do that then the previously configured value might remain intact.
While the same issue exists for the ref storage extension, we don't do
this here. This has been fine for most of the part because it is not
supported to re-initialize a repository with a different ref storage
format anyway. We're about to introduce a new command to migrate ref
storages though, so this is about to become an issue there.
Prepare for this and unset the ref storage format when reinitializing a
repository with the "files" format.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git init" in an already created directory, when the user
configuration has includeif.onbranch, started to fail recently,
which has been corrected.
* ps/fix-reinit-includeif-onbranch:
setup: fix bug with "includeIf.onbranch" when initializing dir
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Under macOS, `git ls-files path` does not work (gives an error)
if the absolute 'path' contains characters in NFD (decomposed).
This happens when core.precomposeunicode is true, which is the
most common case. The bug report says:
$ cd somewhere # some safe place, /tmp or ~/tmp etc.
$ mkdir $'u\xcc\x88' # ü in NFD
$ cd ü # or cd $'u\xcc\x88' or cd $'\xc3\xbc'
$ git init
$ git ls-files $'/somewhere/u\xcc\x88' # NFD
fatal: /somewhere/ü: '/somewhere/ü' is outside repository at '/somewhere/ü'
$ git ls-files $'/somewhere/\xc3\xbc' # NFC
(the same error as above)
In the 'fatal:' error message, there are three ü;
the 1st and 2nd are in NFC, the 3rd is in NFD.
Add test cases that follows the bug report, with the simplification
that the 'ü' is replaced by an 'ä', which is already used as NFD and
NFC in t3910.
The solution is to add a call to precompose_string_if_needed()
to this code in setup.c :
`work_tree = precompose_string_if_needed(get_git_work_tree());`
There is, however, a limitation with this very usage of Git:
The (repo) local .gitconfig file is not used, only the global
"core.precomposeunicode" is taken into account, if it is set (or not).
To set it to true is a good recommendation anyway, and here is the
analyzes from Jun T :
The problem is the_repository->config->hash_initialized
is set to 1 before the_repository->commondir is set to ".git".
Due to this, .git/config is never read, and precomposed_unicode
is never set to 1 (remains -1).
run_builtin() {
setup_git_directory() {
strbuf_getcwd() { # setup.c:1542
precompose_{strbuf,string}_if_needed() {
# precomposed_unicode is still -1
git_congig_get_bool("core.precomposeunicode") {
git_config_check_init() {
repo_read_config() {
git_config_init() {
# !!!
the_repository->config->hash_initialized=1
# !!!
}
# does not read .git/config since
# the_repository->commondir is still NULL
}
}
}
returns without converting to NFC
}
returns cwd in NFD
}
setup_discovered_git_dir() {
set_git_work_tree(".") {
repo_set_worktree() {
# this function indirectly calls strbuf_getcwd()
# --> precompose_{strbuf,string}_if_needed() -->
# {git,repo}_config_get_bool("core.precomposeunicode"),
# but does not try to read .git/config since
# the_repository->config->hash_initialized
# is already set to 1 above. And it will not read
# .git/config even if hash_initialized is 0
# since the_repository->commondir is still NULL.
the_repository->worktree = NFD
}
}
}
setup_git_env() {
repo_setup_gitdir() {
repo_set_commondir() {
# finally commondir is set here
the_repository->commondir = ".git"
}
}
}
} // END setup_git_directory
Reported-by: Jun T <takimoto-j@kba.biglobe.ne.jp>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Further clean-up the refs subsystem to stop relying on
the_repository, and instead use the repository associated to the
ref_store object.
* ps/refs-without-the-repository-updates:
refs/packed: remove references to `the_hash_algo`
refs/files: remove references to `the_hash_algo`
refs/files: use correct repository
refs: remove `dwim_log()`
refs: drop `git_default_branch_name()`
refs: pass repo when peeling objects
refs: move object peeling into "object.c"
refs: pass ref store when detecting dangling symrefs
refs: convert iteration over replace refs to accept ref store
refs: retrieve worktree ref stores via associated repository
refs: refactor `resolve_gitlink_ref()` to accept a repository
refs: pass repo when retrieving submodule ref store
refs: track ref stores via strmap
refs: implement releasing ref storages
refs: rename `init_db` callback to avoid confusion
refs: adjust names for `init` and `init_db` callbacks
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Before discovering the repository details, We used to assume SHA-1
as the "default" hash function, which has been corrected. Hopefully
this will smoke out codepaths that rely on such an unwarranted
assumptions.
* ps/undecided-is-not-necessarily-sha1:
repository: stop setting SHA1 as the default object hash
oss-fuzz/commit-graph: set up hash algorithm
builtin/shortlog: don't set up revisions without repo
builtin/diff: explicitly set hash algo when there is no repo
builtin/bundle: abort "verify" early when there is no repository
builtin/blame: don't access potentially unitialized `the_hash_algo`
builtin/rev-parse: allow shortening to more than 40 hex characters
remote-curl: fix parsing of detached SHA256 heads
attr: fix BUG() when parsing attrs outside of repo
attr: don't recompute default attribute source
parse-options-cb: only abbreviate hashes when hash algo is known
path: move `validate_headref()` to its only user
path: harden validation of HEAD with non-standard hashes
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When safe.directory was introduced in v2.30.3 timeframe, 8959555c
(setup_git_directory(): add an owner check for the top-level
directory, 2022-03-02), it only allowed specific opt-out
directories. Immediately after an embargoed release that included
the change, 0f85c4a3 (setup: opt-out of check with safe.directory=*,
2022-04-13) was done as a response to loosen the check so that a
single '*' can be used to say "I trust all repositories" for folks
who host too many repositories to list individually.
Let's further loosen the check to allow people to say "everything
under this hierarchy is deemed safe" by specifying such a leading
directory with "/*" appended to it.
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The out parameter of `git_config_pathname()` is a `const char **` even
though we transfer ownership of memory to the caller. This is quite
misleading and has led to many memory leaks all over the place. Adapt
the parameter to instead be `char **`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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ps/ref-storage-migration
* ps/refs-without-the-repository-updates:
refs/packed: remove references to `the_hash_algo`
refs/files: remove references to `the_hash_algo`
refs/files: use correct repository
refs: remove `dwim_log()`
refs: drop `git_default_branch_name()`
refs: pass repo when peeling objects
refs: move object peeling into "object.c"
refs: pass ref store when detecting dangling symrefs
refs: convert iteration over replace refs to accept ref store
refs: retrieve worktree ref stores via associated repository
refs: refactor `resolve_gitlink_ref()` to accept a repository
refs: pass repo when retrieving submodule ref store
refs: track ref stores via strmap
refs: implement releasing ref storages
refs: rename `init_db` callback to avoid confusion
refs: adjust names for `init` and `init_db` callbacks
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It was reported that git-init(1) can fail when initializing an existing
directory in case the config contains an "includeIf.onbranch:"
condition:
$ mkdir repo
$ git -c includeIf.onbranch:main.path=nonexistent init repo
BUG: refs.c:2056: reference backend is unknown
The same error can also be triggered when re-initializing an already
existing repository.
The bug has been introduced in 173761e21b (setup: start tracking ref
storage format, 2023-12-29), which wired up the ref storage format. The
root cause is in `init_db()`, which tries to read the config before we
have initialized `the_repository` and most importantly its ref storage
format. We eventually end up calling `include_by_branch()` and execute
`refs_resolve_ref_unsafe()`, but because we have not initialized the ref
storage format yet this will trigger the above bug.
Interestingly, `include_by_branch()` has a mechanism that will only
cause us to resolve the ref when `the_repository->gitdir` is set. This
is also the reason why this only happens when we initialize an already
existing directory or repository: `gitdir` is set in those cases, but
not when creating a new directory.
Now there are two ways to address the issue:
- We can adapt `include_by_branch()` to also make the code conditional
on whether `the_repository->ref_storage_format` is set.
- We can shift around code such that we initialize the repository
format before we read the config.
While the first approach would be safe, it may also cause us to paper
over issues where a ref store should have been set up. In our case for
example, it may be reasonable to expect that re-initializing the repo
will cause the "onbranch:" condition to trigger, but we would not do
that if the ref storage format was not set up yet. This also used to
work before the above commit that introduced this bug.
Rearrange the code such that we set up the repository format before
reading the config. This fixes the bug and ensures that "onbranch:"
conditions can trigger.
Reported-by: Heghedus Razvan <heghedus.razvan@protonmail.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Tested-by: Heghedus Razvan <heghedus.razvan@protonmail.com>
[jc: fixed a test and backported to v2.44.0 codebase]
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Updates to symbolic refs can now be made as a part of ref
transaction.
* kn/ref-transaction-symref:
refs: remove `create_symref` and associated dead code
refs: rename `refs_create_symref()` to `refs_update_symref()`
refs: use transaction in `refs_create_symref()`
refs: add support for transactional symref updates
refs: move `original_update_refname` to 'refs.c'
refs: support symrefs in 'reference-transaction' hook
files-backend: extract out `create_symref_lock()`
refs: accept symref values in `ref_transaction_update()`
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The `git_default_branch_name()` function is a thin wrapper around
`repo_default_branch_name()` with two differences:
- We implicitly rely on `the_repository`.
- We cache the default branch name.
None of the callsites of `git_default_branch_name()` are hot code paths
though, so the caching of the branch name is not really required.
Refactor the callsites to use `repo_default_branch_name()` instead and
drop `git_default_branch_name()`, thus getting rid of one more case
where we rely on `the_repository`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Reference backends have two callbacks `init` and `init_db`. The
similarity of these two callbacks has repeatedly confused me whenever I
was looking at them, where I always had to look up which of them does
what.
Rename the `init_db` callback to `create_on_disk`, which should
hopefully be clearer.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The refs API lost functions that implicitly assumes to work on the
primary ref_store by forcing the callers to pass a ref_store as an
argument.
* ps/refs-without-the-repository:
refs: remove functions without ref store
cocci: apply rules to rewrite callers of "refs" interfaces
cocci: introduce rules to transform "refs" to pass ref store
refs: add `exclude_patterns` parameter to `for_each_fullref_in()`
refs: introduce missing functions that accept a `struct ref_store`
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ps/refs-without-the-repository-updates
* ps/refs-without-the-repository:
refs: remove functions without ref store
cocci: apply rules to rewrite callers of "refs" interfaces
cocci: introduce rules to transform "refs" to pass ref store
refs: add `exclude_patterns` parameter to `for_each_fullref_in()`
refs: introduce missing functions that accept a `struct ref_store`
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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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While `validate_headref()` is only called from `is_git_directory()` in
"setup.c", it is currently implemented in "path.c". Move it over such
that it becomes clear that it is only really used during setup in order
to discover repositories.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* maint-2.44: (41 commits)
Git 2.44.1
Git 2.43.4
Git 2.42.2
Git 2.41.1
Git 2.40.2
Git 2.39.4
fsck: warn about symlink pointing inside a gitdir
core.hooksPath: add some protection while cloning
init.templateDir: consider this config setting protected
clone: prevent hooks from running during a clone
Add a helper function to compare file contents
init: refactor the template directory discovery into its own function
find_hook(): refactor the `STRIP_EXTENSION` logic
clone: when symbolic links collide with directories, keep the latter
entry: report more colliding paths
t5510: verify that D/F confusion cannot lead to an RCE
submodule: require the submodule path to contain directories only
clone_submodule: avoid using `access()` on directories
submodules: submodule paths must not contain symlinks
clone: prevent clashing git dirs when cloning submodule in parallel
...
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* maint-2.43: (40 commits)
Git 2.43.4
Git 2.42.2
Git 2.41.1
Git 2.40.2
Git 2.39.4
fsck: warn about symlink pointing inside a gitdir
core.hooksPath: add some protection while cloning
init.templateDir: consider this config setting protected
clone: prevent hooks from running during a clone
Add a helper function to compare file contents
init: refactor the template directory discovery into its own function
find_hook(): refactor the `STRIP_EXTENSION` logic
clone: when symbolic links collide with directories, keep the latter
entry: report more colliding paths
t5510: verify that D/F confusion cannot lead to an RCE
submodule: require the submodule path to contain directories only
clone_submodule: avoid using `access()` on directories
submodules: submodule paths must not contain symlinks
clone: prevent clashing git dirs when cloning submodule in parallel
t7423: add tests for symlinked submodule directories
...
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* maint-2.42: (39 commits)
Git 2.42.2
Git 2.41.1
Git 2.40.2
Git 2.39.4
fsck: warn about symlink pointing inside a gitdir
core.hooksPath: add some protection while cloning
init.templateDir: consider this config setting protected
clone: prevent hooks from running during a clone
Add a helper function to compare file contents
init: refactor the template directory discovery into its own function
find_hook(): refactor the `STRIP_EXTENSION` logic
clone: when symbolic links collide with directories, keep the latter
entry: report more colliding paths
t5510: verify that D/F confusion cannot lead to an RCE
submodule: require the submodule path to contain directories only
clone_submodule: avoid using `access()` on directories
submodules: submodule paths must not contain symlinks
clone: prevent clashing git dirs when cloning submodule in parallel
t7423: add tests for symlinked submodule directories
has_dir_name(): do not get confused by characters < '/'
...
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* maint-2.41: (38 commits)
Git 2.41.1
Git 2.40.2
Git 2.39.4
fsck: warn about symlink pointing inside a gitdir
core.hooksPath: add some protection while cloning
init.templateDir: consider this config setting protected
clone: prevent hooks from running during a clone
Add a helper function to compare file contents
init: refactor the template directory discovery into its own function
find_hook(): refactor the `STRIP_EXTENSION` logic
clone: when symbolic links collide with directories, keep the latter
entry: report more colliding paths
t5510: verify that D/F confusion cannot lead to an RCE
submodule: require the submodule path to contain directories only
clone_submodule: avoid using `access()` on directories
submodules: submodule paths must not contain symlinks
clone: prevent clashing git dirs when cloning submodule in parallel
t7423: add tests for symlinked submodule directories
has_dir_name(): do not get confused by characters < '/'
docs: document security issues around untrusted .git dirs
...
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* maint-2.40: (39 commits)
Git 2.40.2
Git 2.39.4
fsck: warn about symlink pointing inside a gitdir
core.hooksPath: add some protection while cloning
init.templateDir: consider this config setting protected
clone: prevent hooks from running during a clone
Add a helper function to compare file contents
init: refactor the template directory discovery into its own function
find_hook(): refactor the `STRIP_EXTENSION` logic
clone: when symbolic links collide with directories, keep the latter
entry: report more colliding paths
t5510: verify that D/F confusion cannot lead to an RCE
submodule: require the submodule path to contain directories only
clone_submodule: avoid using `access()` on directories
submodules: submodule paths must not contain symlinks
clone: prevent clashing git dirs when cloning submodule in parallel
t7423: add tests for symlinked submodule directories
has_dir_name(): do not get confused by characters < '/'
docs: document security issues around untrusted .git dirs
upload-pack: disable lazy-fetching by default
...
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The ability to configuring the template directory is a delicate feature:
It allows defining hooks that will be run e.g. during a `git clone`
operation, such as the `post-checkout` hook.
As such, it is of utmost importance that Git would not allow that config
setting to be changed during a `git clone` by mistake, allowing an
attacker a chance for a Remote Code Execution, allowing attackers to run
arbitrary code on unsuspecting users' machines.
As a defense-in-depth measure, to prevent minor vulnerabilities in the
`git clone` code from ballooning into higher-serverity attack vectors,
let's make this a protected setting just like `safe.directory` and
friends, i.e. ignore any `init.templateDir` entries from any local
config.
Note: This does not change the behavior of any recursive clone (modulo
bugs), as the local repository config is not even supposed to be written
while cloning the superproject, except in one scenario: If a config
template is configured that sets the template directory. This might be
done because `git clone --recurse-submodules --template=<directory>`
does not pass that template directory on to the submodules'
initialization.
Another scenario where this commit changes behavior is where
repositories are _not_ cloned recursively, and then some (intentional,
benign) automation configures the template directory to be used before
initializing the submodules.
So the caveat is that this could theoretically break existing processes.
In both scenarios, there is a way out, though: configuring the template
directory via the environment variable `GIT_TEMPLATE_DIR`.
This change in behavior is a trade-off between security and
backwards-compatibility that is struck in favor of security.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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We will need to call this function from `hook.c` to be able to prevent
hooks from running that were written as part of a `clone` but did not
originate from the template directory.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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When cloning from somebody else's repositories, it is possible that,
say, the `upload-pack` command is overridden in the repository that is
about to be cloned, which would then be run in the user's context who
started the clone.
To remind the user that this is a potentially unsafe operation, let's
extend the ownership checks we have already established for regular
gitdir discovery to extend also to local repositories that are about to
be cloned.
This protection extends also to file:// URLs.
The fixes in this commit address CVE-2024-32004.
Note: This commit does not touch the `fetch`/`clone` code directly, but
instead the function used implicitly by both: `enter_repo()`. This
function is also used by `git receive-pack` (i.e. pushes), by `git
upload-archive`, by `git daemon` and by `git http-backend`. In setups
that want to serve repositories owned by different users than the
account running the service, this will require `safe.*` settings to be
configured accordingly.
Also note: there are tiny time windows where a time-of-check-time-of-use
("TOCTOU") race is possible. The real solution to those would be to work
with `fstat()` and `openat()`. However, the latter function is not
available on Windows (and would have to be emulated with rather
expensive low-level `NtCreateFile()` calls), and the changes would be
quite extensive, for my taste too extensive for the little gain given
that embargoed releases need to pay extra attention to avoid introducing
inadvertent bugs.
Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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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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Users with safe.bareRepository=explicit can still work from within
$GIT_DIR of a seconary worktree (which resides at .git/worktrees/$name/)
of the primary worktree without explicitly specifying the $GIT_DIR
environment variable or the --git-dir=<path> option.
* jc/safe-implicit-bare:
setup: notice more types of implicit bare repositories
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Code simplification.
* gt/core-bare-in-templates:
setup: remove unnecessary variable
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Setting the safe.bareRepository configuration variable to explicit
stops git from using a bare repository, unless the repository is
explicitly specified, either by the "--git-dir=<path>" command line
option, or by exporting $GIT_DIR environment variable. This may be
a reasonable measure to safeguard users from accidentally straying
into a bare repository in unexpected places, but often gets in the
way of users who need valid accesses to the repository.
Earlier, 45bb9162 (setup: allow cwd=.git w/ bareRepository=explicit,
2024-01-20) loosened the rule such that being inside the ".git"
directory of a non-bare repository does not really count as
accessing a "bare" repository. The reason why such a loosening is
needed is because often hooks and third-party tools run from within
$GIT_DIR while working with a non-bare repository.
More importantly, the reason why this is safe is because a directory
whose contents look like that of a "bare" repository cannot be a
bare repository that came embedded within a checkout of a malicious
project, as long as its directory name is ".git", because ".git" is
not a name allowed for a directory in payload.
There are at least two other cases where tools have to work in a
bare-repository looking directory that is not an embedded bare
repository, and accesses to them are still not allowed by the recent
change.
- A secondary worktree (whose name is $name) has its $GIT_DIR
inside "worktrees/$name/" subdirectory of the $GIT_DIR of the
primary worktree of the same repository.
- A submodule worktree (whose name is $name) has its $GIT_DIR
inside "modules/$name/" subdirectory of the $GIT_DIR of its
superproject.
As long as the primary worktree or the superproject in these cases
are not bare, the pathname of these "looks like bare but not really"
directories will have "/.git/worktrees/" and "/.git/modules/" as a
substring in its leading part, and we can take advantage of the same
security guarantee allow git to work from these places.
Extend the earlier "in a directory called '.git' we are OK" logic
used for the primary worktree to also cover the secondary worktree's
and non-embedded submodule's $GIT_DIR, by moving the logic to a
helper function "is_implicit_bare_repo()". We deliberately exclude
secondary worktrees and submodules of a bare repository, as these
are exactly what safe.bareRepository=explicit setting is designed to
forbid accesses to without an explicit GIT_DIR/--git-dir=<path>
Helped-by: Kyle Lippincott <spectral@google.com>
Helped-by: Kyle Meyer <kyle@kyleam.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The TODO comment suggested to heed core.bare from template config file
if no command line override given. And the prev_bare_repository
variable seems to have been placed for this sole purpose as it is not
used anywhere else.
However, it was clarified by Junio [1] that such values (including
core.bare) are ignored intentionally and does not make sense to
propagate them from template config to repository config. Also, the
directories for the worktree and repository are already created, and
therefore the bare/non-bare decision has already been made, by the
point we reach the codepath where the TODO comment is placed.
Therefore, prev_bare_repository does not have a usecase with/without
supporting core.bare from template. And the removal of
prev_bare_repository is safe as proved by the later part of the
comment:
"Unfortunately, the line above is equivalent to
is_bare_repository_cfg = !work_tree;
which ignores the config entirely even if no `--[no-]bare`
command line option was present.
To see why, note that before this function, there was this call:
prev_bare_repository = is_bare_repository()
expanding the right hand side:
= is_bare_repository_cfg && !get_git_work_tree()
= is_bare_repository_cfg && !work_tree
note that the last simplification above is valid because nothing
calls repo_init() or set_git_work_tree() between any of the
relevant calls in the code, and thus the !get_git_work_tree()
calls will return the same result each time. So, what we are
interested in computing is the right hand side of the line of
code just above this comment:
prev_bare_repository || !work_tree
= is_bare_repository_cfg && !work_tree || !work_tree
= !work_tree
because "A && !B || !B == !B" for all boolean values of A & B."
Therefore, remove the TODO comment and remove prev_bare_repository
variable. Also, update relevant testcases and remove one redundant
testcase.
[1]: https://lore.kernel.org/git/xmqqjzonpy9l.fsf@gitster.g/
Helped-by: Elijah Newren <newren@gmail.com>
Helped-by: Junio C Hamano <gitster@pobox.com>
Signed-off-by: Ghanshyam Thakkar <shyamthakkar001@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In 18c9cb7524 (builtin/clone: create the refdb with the correct object
format, 2023-12-12), we have changed git-clone(1) so that it delays
creation of the refdb until after it has learned about the remote's
object format. This change was required for the reftable backend, which
encodes the object format into the tables. So if we pre-initialized the
refdb with the default object format, but the remote uses a different
object format than that, then the resulting tables would have encoded
the wrong object format.
This change unfortunately breaks remote helpers which try to access the
repository that is about to be created. Because the refdb has not yet
been initialized at the point where we spawn the remote helper, we also
don't yet have "HEAD" or "refs/". Consequently, any Git commands ran by
the remote helper which try to access the repository would fail because
it cannot be discovered.
This is essentially a chicken-and-egg problem: we cannot initialize the
refdb because we don't know about the object format. But we cannot learn
about the object format because the remote helper may be unable to
access the partially-initialized repository.
Ideally, we would address this issue via capabilities. But the remote
helper protocol is not structured in a way that guarantees that the
capability announcement happens before the remote helper tries to access
the repository.
Instead, fix this issue by partially initializing the refdb up to the
point where it becomes discoverable by Git commands.
Reported-by: Mike Hommey <mh@glandium.org>
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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The "disable repository discovery of a bare repository" check,
triggered by setting safe.bareRepository configuration variable to
'explicit', has been loosened to exclude the ".git/" directory inside
a non-bare repository from the check. So you can do "cd .git &&
git cmd" to run a Git command that works on a bare repository without
explicitly specifying $GIT_DIR now.
* kl/allow-working-in-dot-git-in-non-bare-repository:
setup: allow cwd=.git w/ bareRepository=explicit
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Instead of manually creating refs/ hierarchy on disk upon a
creation of a secondary worktree, which is only usable via the
files backend, use the refs API to populate it.
* ps/worktree-refdb-initialization:
builtin/worktree: create refdb via ref backend
worktree: expose interface to look up worktree by name
builtin/worktree: move setup of commondir file earlier
refs/files: skip creation of "refs/{heads,tags}" for worktrees
setup: move creation of "refs/" into the files backend
refs: prepare `refs_init_db()` for initializing worktree refs
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The safe.bareRepository setting can be set to 'explicit' to disallow
implicit uses of bare repositories, preventing an attack [1] where an
artificial and malicious bare repository is embedded in another git
repository. Unfortunately, some tooling uses myrepo/.git/ as the cwd
when executing commands, and this is blocked when
safe.bareRepository=explicit. Blocking is unnecessary, as git already
prevents nested .git directories.
Teach git to not reject uses of git inside of the .git directory: check
if cwd is .git (or a subdirectory of it) and allow it even if
safe.bareRepository=explicit.
[1] https://github.com/justinsteven/advisories/blob/main/2022_git_buried_bare_repos_and_fsmonitor_various_abuses.md
Signed-off-by: Kyle Lippincott <spectral@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Introduce a new extension "refstorage" so that we can mark a
repository that uses a non-default ref backend, like reftable.
* ps/refstorage-extension:
t9500: write "extensions.refstorage" into config
builtin/clone: introduce `--ref-format=` value flag
builtin/init: introduce `--ref-format=` value flag
builtin/rev-parse: introduce `--show-ref-format` flag
t: introduce GIT_TEST_DEFAULT_REF_FORMAT envvar
setup: introduce GIT_DEFAULT_REF_FORMAT envvar
setup: introduce "extensions.refStorage" extension
setup: set repository's formats on init
setup: start tracking ref storage format
refs: refactor logic to look up storage backends
worktree: skip reading HEAD when repairing worktrees
t: introduce DEFAULT_REPO_FORMAT prereq
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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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When creating the ref database we unconditionally create the "refs/"
directory in "setup.c". This is a mandatory prerequisite for all Git
repositories regardless of the ref backend in use, because Git will be
unable to detect the directory as a repository if "refs/" doesn't exist.
We are about to add another new caller that will want to create a ref
database when creating worktrees. We would require the same logic to
create the "refs/" directory even though the caller really should not
care about such low-level details. Ideally, the ref database should be
fully initialized after calling `refs_init_db()`.
Move the code to create the directory into the files backend itself to
make it so. This means that future ref backends will also need to have
equivalent logic around to ensure that the directory exists, but it
seems a lot more sensible to have it this way round than to require
callers to create the directory themselves.
An alternative to this would be to create "refs/" in `refs_init_db()`
directly. This feels conceptually unclean though as the creation of the
refdb is now cluttered across different callsites. Furthermore, both the
"files" and the upcoming "reftable" backend write backend-specific data
into the "refs/" directory anyway, so splitting up this logic would only
make it harder to reason about.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The purpose of `refs_init_db()` is to initialize the on-disk files of a
new ref database. The function is quite inflexible right now though, as
callers can neither specify the `struct ref_store` nor can they pass any
flags.
Refactor the interface to accept both of these. This will be required so
that we can start initializing per-worktree ref databases via the ref
backend instead of open-coding the initialization in "worktree.c".
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Introduce a new GIT_DEFAULT_REF_FORMAT environment variable that lets
users control the default ref format used by both git-init(1) and
git-clone(1). This is modeled after GIT_DEFAULT_OBJECT_FORMAT, which
does the same thing for the repository's object format.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Introduce a new "extensions.refStorage" extension that allows us to
specify the ref storage format used by a repository. For now, the only
supported format is the "files" format, but this list will likely soon
be extended to also support the upcoming "reftable" format.
There have been discussions on the Git mailing list in the past around
how exactly this extension should look like. One alternative [1] that
was discussed was whether it would make sense to model the extension in
such a way that backends are arbitrarily stackable. This would allow for
a combined value of e.g. "loose,packed-refs" or "loose,reftable", which
indicates that new refs would be written via "loose" files backend and
compressed into "packed-refs" or "reftable" backends, respectively.
It is arguable though whether this flexibility and the complexity that
it brings with it is really required for now. It is not foreseeable that
there will be a proliferation of backends in the near-term future, and
the current set of existing formats and formats which are on the horizon
can easily be configured with the much simpler proposal where we have a
single value, only.
Furthermore, if we ever see that we indeed want to gain the ability to
arbitrarily stack the ref formats, then we can adapt the current
extension rather easily. Given that Git clients will refuse any unknown
value for the "extensions.refStorage" extension they would also know to
ignore a stacked "loose,packed-refs" in the future.
So let's stick with the easy proposal for the time being and wire up the
extension.
[1]: <pull.1408.git.1667846164.gitgitgadget@gmail.com>
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The proper hash algorithm and ref storage format that will be used for a
newly initialized repository will be figured out in `init_db()` via
`validate_hash_algorithm()` and `validate_ref_storage_format()`. Until
now though, we never set up the hash algorithm or ref storage format of
`the_repository` accordingly.
There are only two callsites of `init_db()`, one in git-init(1) and one
in git-clone(1). The former function doesn't care for the formats to be
set up properly because it never access the repository after calling the
function in the first place.
For git-clone(1) it's a different story though, as we call `init_db()`
before listing remote refs. While we do indeed have the wrong hash
function in `the_repository` when `init_db()` sets up a non-default
object format for the repository, it never mattered because we adjust
the hash after learning about the remote's hash function via the listed
refs.
So the current state is correct for the hash algo, but it's not for the
ref storage format because git-clone(1) wouldn't know to set it up
properly. But instead of adjusting only the `ref_storage_format`, set
both the hash algo and the ref storage format so that `the_repository`
is in the correct state when `init_db()` exits. This is fine as we will
adjust the hash later on anyway and makes it easier to reason about the
end state of `the_repository`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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In order to discern which ref storage format a repository is supposed to
use we need to start setting up and/or discovering the format. This
needs to happen in two separate code paths.
- The first path is when we create a repository via `init_db()`. When
we are re-initializing a preexisting repository we need to retain
the previously used ref storage format -- if the user asked for a
different format then this indicates an error and we error out.
Otherwise we either initialize the repository with the format asked
for by the user or the default format, which currently is the
"files" backend.
- The second path is when discovering repositories, where we need to
read the config of that repository. There is not yet any way to
configure something other than the "files" backend, so we can just
blindly set the ref storage format to this backend.
Wire up this logic so that we have the ref storage format always readily
available when needed. As there is only a single backend and because it
is not configurable we cannot yet verify that this tracking works as
expected via tests, but tests will be added in subsequent commits. To
countermand this ommission now though, raise a BUG() in case the ref
storage format is not set up properly in `ref_store_init()`.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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"git clone" has been prepared to allow cloning a repository with
non-default hash function into a repository that uses the reftable
backend.
* ps/clone-into-reftable-repository:
builtin/clone: create the refdb with the correct object format
builtin/clone: skip reading HEAD when retrieving remote
builtin/clone: set up sparse checkout later
builtin/clone: fix bundle URIs with mismatching object formats
remote-curl: rediscover repository when fetching refs
setup: allow skipping creation of the refdb
setup: extract function to create the refdb
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Each of these were checked with
gcc -E -I. ${SOURCE_FILE} | grep ${HEADER_FILE}
to ensure that removing the direct inclusion of the header actually
resulted in that header no longer being included at all (i.e. that
no other header pulled it in transitively).
...except for a few cases where we verified that although the header
was brought in transitively, nothing from it was directly used in
that source file. These cases were:
* builtin/credential-cache.c
* builtin/pull.c
* builtin/send-pack.c
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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* ps/clone-into-reftable-repository:
builtin/clone: create the refdb with the correct object format
builtin/clone: skip reading HEAD when retrieving remote
builtin/clone: set up sparse checkout later
builtin/clone: fix bundle URIs with mismatching object formats
remote-curl: rediscover repository when fetching refs
setup: allow skipping creation of the refdb
setup: extract function to create the refdb
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We're currently creating the reference database with a potentially
incorrect object format when the remote repository's object format is
different from the local default object format. This works just fine for
now because the files backend never records the object format anywhere.
But this logic will fail with any new reference backend that encodes
this information in some form either on-disk or in-memory.
The preceding commits have reshuffled code in git-clone(1) so that there
is no code path that will access the reference database before we have
detected the remote's object format. With these refactorings we can now
defer initialization of the reference database until after we have
learned the remote's object format and thus initialize it with the
correct format from the get-go.
These refactorings are required to make git-clone(1) work with the
upcoming reftable backend when cloning repositories with the SHA256
object format.
This change breaks a test in "t5550-http-fetch-dumb.sh" when cloning an
empty repository with `GIT_TEST_DEFAULT_HASH=sha256`. The test expects
the resulting hash format of the empty cloned repository to match the
default hash, but now we always end up with a sha1 repository. The
problem is that for dumb HTTP fetches, we have no easy way to figure out
the remote's hash function except for deriving it based on the hash
length of refs in `info/refs`. But as the remote repository is empty we
cannot rely on this detection mechanism.
Before the change in this commit we already initialized the repository
with the default hash function and then left it as-is. With this patch
we always use the hash function detected via the remote, where we fall
back to "sha1" in case we cannot detect it.
Neither the old nor the new behaviour are correct as we second-guess the
remote hash function in both cases. But given that this is a rather
unlikely edge case (we use the dumb HTTP protocol, the remote repository
uses SHA256 and the remote repository is empty), let's simply adapt the
test to assert the new behaviour. If we want to properly address this
edge case in the future we will have to extend the dumb HTTP protocol so
that we can properly detect the hash function for empty repositories.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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Allow callers to skip creation of the reference database via a new flag
`INIT_DB_SKIP_REFDB`, which is required for git-clone(1) so that we can
create it at a later point once the object format has been discovered
from the remote repository.
Note that we also uplift the call to `create_reference_database()` into
`init_db()`, which makes it easier to handle the new flag for us. This
changes the order in which we do initialization so that we now set up
the Git configuration before we create the reference database. In
practice this move should not result in any change in behaviour.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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We're about to let callers skip creation of the reference database when
calling `init_db()`. Extract the logic into a standalone function so
that it becomes easier to do this refactoring.
While at it, expand the comment that explains why we always create the
"refs/" directory.
Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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The "partialclone" extension config records a string, and hence it is an
error to have an implicit bool like:
[extensions]
partialclone
in your config. We should recognize and reject this, rather than
segfaulting (which is the current behavior). Note that it's OK to use
config_error_nonbool() here, even though the return value is an enum. We
explicitly document EXTENSION_ERROR as -1 for compatibility with
error(), etc.
This is the only extension value that has this problem. Most of the
others are bools that interpret this value naturally. The exception is
extensions.objectformat, which does correctly check for NULL.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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