082bfea187
Currently, we call cargo build every time we build scylla, even when no rust files have been changed. This is avoided by adding a depfile to the ninja rule for the rust library. The rust file is generated by default during cargo build, but it uses the full paths of all depenencies that it includes, and we use relative paths. This is fixed by specifying CARGO_BUILD_DEP_INFO_BASEDIR='.', which makes it so the current path is subtracted from all generated paths. Instead of using 'always' when specifying when to run the cargo build, a dependency on Cargo.lock is added additionally to the depfile. As a result, the rust files are recompiled not only when the source files included in the depfile are modified, but also when some rust dependency is updated. Cargo may put an old cached file as a result of the build even when the Cargo.lock was recently updated. Because of that, the the build result may be older than the Cargo.lock file even if the build was just performed. This may cause ninja to rebuilt the file every following time. To avoid this, we 'touch' the build result, so that its last modification time is up to date. Because the dependency on Cargo.lock was added, the new command for the build does not modify it. Instead, the developer must update it when modifying the dependencies - the docs are updated to reflect that. Closes #12489 Fixes #12508
Scylla developer documentation
This folder contains developer-oriented documentation concerning the ScyllaDB codebase. We also have a wiki, which contains additional developer-oriented documentation. There is currently no clear definition of what goes where, so when looking for something be sure to check both.
Seastar documentation can be found here.
User documentation can be found on docs.scylladb.com
For information on how to build Scylla and how to contribute visit HACKING.md and CONTRIBUTING.md.