Hello,
I'm seeking advice around using Yocto in a mono-repository,
specifically how to include my own C/C++ applications that have their
source code stored elsewhere in the same repository (and specifically
not under the recipe's files/ directory, or anywhere in the layer structure).
For example, my project might be structured like this:
myproject/ (root of repository)
- src/myapp1 (C++ app with Makefile)
- src/myapp2 (C app with CMakeLists.txt)
- yocto/layers/meta-local/myapps/
- myapp1.bb
- myapp2.bb
The core of the matter is that the applications' source is not in a
separate repository, so bitbake's fetcher needs to look locally, rather
than remote. Having bitbake download the same repository again via git
seems inefficient, and it's also potentially a huge download.
I've looked at using EXTERNALSRC but it disables devtool, which I really
need to use. When set to an absolute path (based on TOPDIR), it also
does weird things with the paths in the build directory, resulting in a
directory tree that depends on the user's environment (the path to their
home directory, the path to where they checked out the mono-repo, etc).
It is also considered "hacky" and not for production use according to
some sources. I don't think I can use this.
I've also looked at setting FILESEXTRAPATHS to an absolute directory
based on TOPDIR, and this actually works, but the Yocto docs seem to
implicitly discourage this, as my recipe is in a .bb file:
| Best practices dictate that you accomplish this by using FILESEXTRAPATHS from
within a .bbappend file
What would go wrong if I did set this in a .bb file?
Another option is to have the external system that invokes bitbake (in
my case, a GitLab-CI pipeline script) make sure that a fresh tarball is
created from the original source and put into the files/ directory at
build time. Although this will work, and it seems clunky, if it's the
best option then I'll use it. Not sure yet how to handle tarball
checksums in this case though.
Is anyone using Yocto in a monorepo? If so, what approach would you
recommend for the mono-repo project structure?
Note: my applications' source files are outside of the Yocto layer tree
because they are independent of Yocto and can be built with other
toolchains - that's why I haven't put them under the files/ directory.
-- David.
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