b690ddb9e5
In afb96b6387, we added support for sccache. As a side effect
it changed the method of invoking ccache from transparent via PATH
(if it contains /usr/lib64/ccache) to explicit, by changing the compiler
command line from 'clang++' (which may or may not resolve the the ccache
binary) to 'ccache /usr/local/bin/clang++', which always invokes ccache.
In the default dbuild configuration, PATH does not contain /usr/lib64/ccache,
so ccache isn't invoked by default. Users can change this via the
SCYLLADB_DBUILD environment variable.
As a result of ccache being suddenly enabled for dbuild builds, ccache
will now attempt to create ~/.cache/ccache. Under docker, this does
not work, because we bind-mount ~/.cache/dbuild. Docker will create the
intermediate ~/.cache, but under the root user, not $USER. The intermediate
directory being root-owned prevents ~/.cache/ccache from being created.
Under podman, this does work, because everything runs under the container's
root user.
The fix is to bind-mount the entire ~/.ccache into the container. This
not only lets ccache create the directory, it will also find an existing
~/.cache/ccache directory and use it, enabling reuse across invocations.
Since ccache will now respect configuration changes without access to
its configuration file (notably, the maximum cache size), we also
bind-mount ~/.config.
Since ~/.ccache and ~/.config are not automatically created, we create
them explicitly so the bind mounts can work. This is for new nodes enlisted
from the cloud; developer machines will have those directories preexisting.
Note that the ccache directory used to be ~/.ccache, but was later changed.
Had the author known, we would have bind-mounted ~/.cache much earlier.
Fixes #27919.
Closes scylladb/scylladb#27920
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