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This allows individual blobs read to be checked, e.g., for upwards
symlinks, also when not part of a tree, which performs such a
validation for its entries during its parsing into a GitTree.
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Trying to access a git object return a recoverable failure, hence
the failure to find the object in the git object database should
be logged at warning level at most. Moreover, in some cases we
should log that event at an even lower level, e.g., if we're just
checking the presence of the object in the local git cas to avoid
unnecessary network access.
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This method returns a GitCASPtr allowing the caller to handle
failure gracefully. Therefore, logging should be at most at level
Warning as it is up to the caller to provide the fatal error message.
Moreover, it can be at lower level in cases where failure to open
that git cas is not an unexpected event, e.g., when looking for a
blob in local mirrors first.
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...and access internal state via getters.
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...since there are no unique_locks any more.
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...and use it in GitRepo to set custom backends.
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... while keeping our .clang-format file.
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Main culprits:
- std::size_t, std::nullptr_t, and NULL require <cstddef>
- std::move and std::forward require <utility>
- unordered maps and sets require respective includes
- std::for_each and std::all_of require <algorithm>
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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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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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...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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...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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Signed-off-by: Goetz Brasche <goetz.brasche@huawei.com>
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This is the initial version of our tool that is able to
build itself. In can be bootstrapped by
./bin/bootstrap.py
Co-authored-by: Oliver Reiche <oliver.reiche@huawei.com>
Co-authored-by: Victor Moreno <victor.moreno1@huawei.com>
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