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A git CAS ist just a fall back, so it is OK if it is absent (e.g.,
the specificed directory does not exist). Therefore only log at
debug level, not at error level if we cannot open it.
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... which became obsolete with the new fdless write/copy
implementations.
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... to remove the risk of deadlocks on certain combinations
of C++ standard library and libc when performing the
copy/write in a child process. For 'fdless' copy/write, a
child process is used to prevent the parent from getting
polluted with open writable file descriptors (which might
get inherited by other children that keep them open and can
cause EBUSY errors).
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This feature has been introduced with C++20.
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... and in this way, continue to work correctly in the absence
of a current working directory.
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...caused by incorrectly setting and resetting the library internal
state and the misuse of pthreads in libgit2.
Normally, git_libgit2_init and git_libgit2_shutdown should span the
life of a worker thread in order to be safely used. However, due to
an incorrect implementation of libgit2's threadstate with pthreads,
on unix systems there is a race condition.
Until the use of pthread_key_t is corrected in libgit2, we need to
apply a workaround by always ensuring that the main thread is the
first thread reaching the GitContext constructor.
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... and drop unecessary IsTree() check.
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... with two minor code base changes compared to previous
use of gsl-lite:
- dag.hpp: ActionNode::Ptr and ArtifactNode::Ptr are not
wrapped in gsl::not_null<> anymore, due to lack of support
for wrapping std::unique_ptr<>. More specifically, the
move constructor is missing, rendering it impossible to
use std::vector<>::emplace_back().
- utils/cpp/gsl.hpp: New header file added to implement the
macros ExpectsAudit() and EnsureAudit(), asserts running
only in debug builds, which were available in gsl-lite but
are missing in MS GSL.
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... as this is only an internal functionality, and the caller will
take care of a proper error message if the absence of that entry
is not expected.
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In the current libgit2 implementation, a fake repository wrapped
around an existing odb is being registered as owner the same way
as a normal repository object. Therefore, one has to guard both
the creation and destruction of the fake repository against all
other git operations that might access the internal cache during
this transfer of ownership.
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Use a similar logic as for repository initialisation: first check
if tag has not already been created in another process, and only
then try creation; make more tries with more wait in between; only
retry if failure was due to internal locking.
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As the initialisation of Git repositories is something that only
takes place once, we should check early and cheaply whether the
repository is already there before trying to initialize it.
If we do need to initilize a repo, we can afford more attempts and
longer wait times between tries to initalize if the failure to
initialize happens due to the internal Git locking mechanism.
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Opening a repo should not check parent directories, only try to
open at given path.
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...due to limited SSH support in libgit2. In order to allow the
fetches to still be parallel, we execute:
git fetch --no-auto-gc --no-write-fetch-head <repo> [<branch>]
This only fetches the packs without updating any refs, at the slight
cost of sometimes fetching some redundant information, which for our
purposes is practically a non-issue.
(If really needed, a 'git gc' call can be done eventually to try to
compact the fetched packs, although a save in disk space is not
actually guaranteed.)
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The improved GC implementation uses refactored storage
classes instead of directly accessing "unknown" file paths.
The required storage class refactoring is quite substantial
and outlined in the following paragraphs.
The module `buildtool/file_system` was extended by:
- `ObjectCAS`: a plain CAS implementation for
reading/writing blobs and computing digests for a given
`ObjectType`. Depending on that type, files written to the
file system may have different properties (e.g., the x-bit
set) or the digest may be computed differently (e.g., tree
digests in non-compatible mode).
A new module `buildtool/storage` was introduced containing:
- `LocalCAS`: provides a common interface for the "logical
CAS", which internally combines three `ObjectCAS`s, one
for each `ObjectType` (file, executable, tree).
- `LocalAC`: implements the action cache, which needs the
`LocalCAS` for storing cache values.
- `TargetCache`: implements the high-level target cache,
which also needs the `LocalCAS` for storing cache values.
- `LocalStorage`: combines the storage classes `LocalCAS`,
`LocalAC`, and `TargetCache`. Those are initialized with
settings from `StorageConfig`, such as the build root base
path or number of generations for the garbage collector.
`LocalStorage` is templated with a Boolean parameter
`kDoGlobalUplink`, which indicates that, on every
read/write access, the garbage collector should be used
for uplinking across all generations (global).
- `GarbageCollector`: responsible for garbage collection and
the global uplinking across all generations. To do so, it
employs instances of `LocalStorage` with `kDoGlobalUplink`
set to false, in order to avoid endless recursion. The
actual (local) uplinking within two single generations is
performed by the corresponding storage class (e.g.,
`TargetCache` implements uplinking of target cache entries
between two target cache generations etc.). Thereby, the
actual knowledge how data should be uplinked is
implemented by the instance that is responsible for
creating the data in the first place.
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commit update
Uses the SSL certification utility method to correctly set the
certification check options for the remote URL libgit2 calls.
Due to the fact that remote operations are done via a temporary
repository to allow concurrent work, the correct repository
configuration needs to be interrogated. Thankfully, libgit2
provides a thread safe config snapshot object to be used in
such scenarios.
Also updates the existing GitRepoRemote tests accordingly.
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...in order to not include unwanted dependencies in just proper.
The new class extends the GitRepo class used for just's Git tree
operations and gets used in all of just-mr's async maps.
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While compilers are allowed to drop unused functions in anonymous
name spaces, and in this way also the open linker symbols referenced
there, they are not obliged to do so. Not optimizing away such
unused functions when compiled with -DBOOTSTRAP_BUILD_TOOL causes
the linking fail in the initial phase of the boostrap process where
libgit2 is not yet available (nor really needed). Therefore, ensure
that those dead functions are absent in the initial bootstrap phase
using appropriate preprocessor directives.
Signed-off-by: Klaus T. Aehlig <aehlig@linta.de>
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... and ensure that cascades of checks are performed with
only a single filesystem stat per method.
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As now all remote Git operations in GitRepo require at most just
the branch name, there is no more need to inquire the repository
about branch refspecs.
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The libgit2 library does not satisfy the http.sslVerify gitconfig
field or the GIT_SSL_NO_VERIFY environment variable, so we have to
perform these checks ourselves and supply the correct return value
from the certificate_check git_fetch_options callback.
The callbacks used for fixing the remote fetch SSL certificate
verification are reused here.
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The libgit2 library does not satisfy the http.sslVerify gitconfig
field or the GIT_SSL_NO_VERIFY environment variable, so we have to
perform these checks ourselves and supply the correct return value
from the certificate_check git_fetch_options callback.
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...and use instead the branch name. A valid direct refspec (as those
retrieved by a remote_ls call) will always end in the branch name,
so checking the last path component ('/'-delimited substring) of a
retrieved refspec is enough.
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from remote
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This also removes the need to call the GET_BRANCH_REFNAME critical
operation.
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Passing the logger by reference would require the caller to be
kept alive. Also, being a shared_ptr, the logger can be passed
by value at almost no cost.
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