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This includes implementing the logic for the --backup-to-remote
and --fetch-absent options.
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As preparatory step for extending the types of repositories that
are targeted by a just-mr fetch subcommand, names of certain
variables and of the currently only fetch operation async map were
changed to clarify that they only target archives.
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As this map is supposed to work as an all-or-nothing guarantee of
content being in CAS, we can replace the bool return type with the
null type instead.
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Before trying to fetch an archive content from other non-local
sources, check first the just serve endpoint.
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...before going to the network, if 'just serve' endpoint given.
ContentCASMap was reworked to provide a cleaner logic for handling
pure fetches, which also reduced code duplication in ContentGitMap.
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The `just serve` command defaults to also provide the remote-execution
endpoint if none is specified. The `just build` implicitly uses the
serve endpoint as remote-execution endpoint if no other endpoint is
specified. In this way, the serve endpoint has become the universal
endpoint for simple set ups. Simplify that usage further by providing
a short command-line option.
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map itself
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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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Using absent repositories depends on a just-serve endpoint. As
such, it is not a datum of the project, but one of the available
infrastructure. As the latter can change independently of the
project, it is desriable to have the option to specify those pieces
of information in separate files.
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... by also keeping the map of commit to tree locally.
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The serve service will communicate with this endpoint when needed,
as well as ensure artifacts it provides are synced with the remote
execution CAS, if requested by the client.
If just-mr is given the --fetch-absent option, it Always produce
present roots irrespective of the 'absent' pragma. For Git repositories
marked with the 'absent' pragma, first try to fetch any commit
trees provided by the serve endpoint from the execution endpoint
CAS, before reverting to a network fetch.
Co-authored-by: Klaus Aehlig <klaus.aehlig@huawei.com>
Co-authored-by: Alberto Sartori <alberto.sartori@huawei.com>
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...via an 'absent' pragma in repository descriptions.
For 'git'-type repositories, first interrogates a 'just serve'
remote, if given, before reverting to fetching from the network.
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If a key has a map value, do not force all its subkeys to be
present.
Fixes changes brought in with supporting remote execution and
authentication options in just-mr.
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...for archives not already in local CAS.
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This better separates the utility methods used in just-mr commands
and avoids any cyclic dependencies that might arise in new utility
methods requiring both existing utilities and the command-line
arguments.
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These have similar meanings as in 'just', are forwarded to 'just'
subcommands that support them, and can be set also in the RC file
via appropriate fields.
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...by moving subcommands code into separate libraries.
This maintains a cleaner code structure and lowers the build time
by improving target caching.
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For 'file' and 'archive' checkouts we will handle more than just
the 'ignore' value.
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Moves away from literal strings in the async maps.
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...instead of a regular field.
Also removes the ignore-special logic from distdir repositories,
as those will never contain symlinks, so no entries would be
ignored.
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... so that any left-over directories, in case of abnormal termination
are cleaned up eventually.
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just-mr accesses the CAS at several occations, most importantly,
the generated multi-repository configuration is written there. In
particular, when used as a launcher, it needs to keep that file in
its location as the path is passed to the exec of just.
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This feature has been introduced with C++20.
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... and set default stack size to 8 MB.
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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 just-mr the config file should only be needed if:
1. We call just with a subcommand requiring a config file, or
2. We use one of just-mr's own commands (except version).
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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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