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... by avoiding reusing temp dirs for execute. While we are
at it, also refactor LocalFetchViaTmpRepo() to create its
own empty temp dirs, that cannot be reused by the caller.
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When fetching git repositories, just-mr routinely shells out to
git. In this case, allow the user to specify via "inherit env",
which environment variables from the host environment should be
made available in this action. Typical variables to inherit are
ones providing credentials, like SSH_AUTH_SOCK. As the repository
description specifies the commit that will be taken, and hence the
resulting tree, correctness is not affected by the environement
leaking in here.
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This feature has been introduced with C++20.
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...using the new ignore-special tree variant.
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...by removing unused subfolders and corresponding redundant checks
in the tests using it. Also fixes misues in tests of the GetSubtree
family of methods.
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This allows better separation and, in particular, repositories
needed only for tests do not have to be provided for building the
tools. This also better documents which dependencies are only needed
for testing.
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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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Using "test" in the name of a test target is unnecessary and
adds gratuitous inconsistencies.
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In the rare cases that we need to shell out to git, let the user
configure what binary to use. Option resolves in the same way as
the just executable, including allowing it to be set via just-mrrc.
Updates all cases of shelling out to git (fetch and commit update).
Update just-mr and just-mrrc docs accordingly.
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...due to limitations in SSH support in libgit2. In this case, we
simply execute 'git ls-remote <repo> [<branch>]' and then parse
the output. Remote interogation requires no local repository, so
it is an asynchronious operation by default.
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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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tests have been updated accordingly
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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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Only tests pertaining to methods not covered in the tests of the
inherited class were added.
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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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