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Also follow-up changes to ensure build success.
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...instead of using the singletons.
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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 is required in order to make them available to 'just serve'
in a minimal just installation.
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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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...to ensure the temporary directories exist before they are needed,
as expected by those methods. This way, the TmpDir class takes care
to also clean up after itself.
Also, pass the local launcher to the methods that now shell out.
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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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To avoid unnecessary work, just-mr uses on-disk caches, including
for the mapping of a distdir to the corresponding git tree. This,
however, implies that the number of repositories that are actually
considered varies: in order to fetch a distdir repository, all
involved archives have to be fetched, but if we have a cache hit
none of them is even looked at.
So, in order to have a consistent reporting only count top-level
targets (i.e., the reachable repositories) in the statistics,
not the archives implicitly contained in a distdir, nor low-level
sub tasks. The actual fetch acitvity is shown separately by the
task tracker.
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Co-authored-by: Sascha Roloff <sascha.roloff@huawei.com>
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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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...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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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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