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At some point we have to decide if a given git repository URL is
a path. So far, we assumed that anything not starting with ssh://,
http://, or https:// is a path. This ignores the facts that
- the file:// scheme, while referring to a file, does not denote
a relative path starting file://,
- the [user@]host:path scheme is not a path on the local machine,
- there exist the URL schemes git://, ftp://, and ftps://, and
- future extension might add additional schemes.
To also correctly handle new schemes that git might add (which we
indeed can handle, as we simply shell out to the git binary), we
reverse the approach: we give the user the means to unambigiously
specify that they refer to a path on the local machine, by either
- using the file:// scheme,
- providing an absolute path starting with /, or
- providing a relative path starting with ./
All other schemes will not be modified. The file scheme, as well
as the git://, http://, and https:// scheme, are handled interally
using libgit2; all others are passed on to git in an unmodified form.
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We ensure that for each export target to be written to the target
cache all its implied export targets are written to the target
cache first. This ensures that the target cache maintains its
consistency at all times with respect to export target
dependencies.
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As it is common to use ArtifactDigest objects with a default value
of 0, the std::hash implementation should not take the size into
account. The is_tree member however should be kept in as it always
needs to have a value and has no sensible default.
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... of all produced binaries, including the intermediate
ones: protoc and grpc_cpp_plugin.
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... glibc provides synchronization stubs for single-threaded
environments as weak symobls. When linking pthreads, these
weak symbols must be replaced by the strong symbols provided
by the pthread library. For dynamically linking pthreads,
this is done automatically. However, to support this for
static linking, we must ensure to link the whole archive.
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... as any unguarded access to non-const members of the same
shared_ptr instance require the use of `atomic_load` and
`atomic_store`.
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... to provide an informative error message on how a rule is related
to a particular import and, in particularly, at which expression
a problem with the import occurred.
While there, also improve the message in the other error case to
follow our standard line-breaking scheme.
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By showing the full entity name and also adding the usual
newline character after every "While ..." clause.
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... instead of erroring on missing file. In this way, whenever a
rule or expression from an absent root would have to be read, we
get a meaningful error message and not a complaint about a file
not being there.
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... as, for absent repositories, we need to get the description from
the serve end point. As a consequence, also support -r and --compatible,
as the remote-execution endpoint needs to fit with the one for the
serve endpoint.
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... as even this command now adds entries to CAS, e.g., the shard
for the target-level cache. Also, this command block gc by keeping
a lock (also in the local build root).
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Also cleans up the logging when parsing the serve service
configuration file.
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As the serve service always has an associated remote-execution
endpoint, when just-mr gets passed only a serve endpoint address it
will now default to implying a remote-execution endpoint exists too
at that address. Additionally, now the implementation of the
--backup-to-remote option more clearly shows that it can only be
done in native mode.
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The requests to retrieve the tree of a commit, archive, or distdir
also set up those trees in a way that the serve endpoint can later
build against them, besides allowing just-mr to set up roots
locally. Therefore, if the witnessing entity (Git commit, content
blob, or distdir, respectively) is known to the serve endpoint,
then failing to set up the root tree there should result in a
failure also of the just-mr setup on the client side.
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For archives and Git repositories we should ensure that not finding
the witnessing entity (archive content blob or Git commit,
respectively) results in a distinct status in the response to a
request that sets up roots on the serve endpoint. This will allow
just-mr to better handle its interaction with the serve endpoint.
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While just-mr does not use remote-execution properties, it is
still useful to have those as a separate entry in the rc file. With
rc-file delegation, this gives committed rc files an easy way to
specify the image to be used without having to set all the remaining
arguments for the various just subcommands in "just args".
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... to pull in rc files from different locations, given by
location objects.
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... to allow, in a clean way, add computing the effective rc
by overlaying delegated rc files.
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To take advantage of absent roots, we need to ensure that a given
serve endpoint can build against the tree of this generated root.
For a 'distdir' repository we can know the resulting tree
identifier directly without actually needing to fetch anything.
Therefore, we only set the root as absent if the serve endpoint
knows already this tree, if it can set it up itself, or if
we can provide this tree to the serve endpoint from one of our
CAS locations (local or remote), based on our tree invariant
guarantee. A network fetch of the archives never gets performed
for an absent root.
If a serve endpoint is not provided, an absent root can still be
generated, but only if no network fetches are required. In this
case a warning is emitted.
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To take advantage of absent roots, we need to ensure that a given
serve endpoint can build against the tree of this generated root.
To this end, for an 'archive' repository we only set the root as
absent if the serve endpoint knows already the root, it can set it
up itself, or we can create the root locally without a network
fetch and then upload it to the serve endpoint via the remote CAS.
A network fetch never gets performed for an absent root.
If a serve endpoint is not provided, an absent root can still be
generated, but only if no network fetches are required. In this
case a warning is emitted.
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...by passing around the AsyncMap key struct instead of individual
members. This will also make future code changes more easy to
implement and improve code readability.
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To take advantage of absent roots, we need to ensure that a given
serve endpoint can build against the tree of this generated root.
To this end, for a 'git' repository we only set the root as absent
if the serve endpoint knows already the root, it can set it up
itself, or we can create the root locally without a network fetch
and then upload it to the serve endpoint via the remote CAS.
A network fetch never gets performed for an absent root.
If a serve endpoint is not provided, an absent root can still be
generated, but only if no network fetches are required. In this
case a warning is emitted.
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To take advantage of absent roots, we need to ensure that a given
serve endpoint can build against the tree of this generated root.
To this end, for a 'git tree' repository we only set the root as
absent only if the given serve endpoint has this root, or the tree
is known locally and can be provided via the remote CAS. While
generating an absent root the fetch command will never be called.
Generating an absent root without being provided a serve endpoint
is still allowed, but results in a warning.
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Marking a file-type repository as 'to_git' results in a Git-tree
type root, which are of course content fixed and can be (and
usually are) used by export targets. Therefore, it is beneficial
for a serve endpoint, if one is provided, to be aware of such a
root and be able to build against it if needed. If the root is
marked as absent, this condition becomes mandatory.
Generating an absent Git-tree root without being provided a serve
endpoint is still allowed, but results in a warning.
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pragma-related RPCs
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The purpose of the requests for the tree of an archive, commit, or
distdir also includes making those trees available for future
builds on the serve endpoint, which currently means being in a
known Git repository.
This commit ensures the distdir tree reqeust also includes the
import of the resulting tree from CAS into the Git cache (if the
tree is not already in a Git repsoitory).
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This is to uphold the coding style guide we employ.
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tree
When the remote CAS provides the root tree, we perform an
import-to-git operation, therefore the correct witnessing
repository for the tree should always be the Git cache.
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...for more easily readable and maintainable target descriptions.
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... instead of some hard-coded strings, as that can be confusing
when the tool is packaged under a different name.
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...in accordance to our coding style.
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... which were only honored when doing fetch and setup.
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... by uplinking them appropriately.
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