On Thu, 9 May 2024 at 12:36, Richard Purdie via lists.yoctoproject.org <richard.purdie=linuxfoundation....@lists.yoctoproject.org> wrote: > > I have a dummy question regarding the file://DIRECTORY/ in recipe > > usage, we are using this mechanism to directly point at a source > > repository with potentially lots of subfolders, etc. Does bitbake > > track file://DIRECTORY tracks all contents accordingly (i.e something > > will recursively walk through this directory and checksum each file, > > then arrive at a final combined checksum?) and if we happen to repo- > > sync or git-pull to pull new changes in DIRECTORY/, Yocto will be > > able to detect any changes in this directory and automatically > > rebuild this recipe. > > > > I was getting mixed answers from a few sources, some said this can > > work, some said it works sometimes but not always. So I would like to > > get a definitive answer from Yocto forum. > > It is meant to work. There have been some bugs in this area in the > past, I believe they have been fixed. It also doesn't perform well with > large trees of files from a speed perspective. > > Something like git allows for much faster operations as git is designed > to do tracking of this kind of thing. > > So yes, it should work but isn't optimal with really large trees.
I'd also note that pointing to a source checkout that is external to the layer checkout isn't good for build reproducibility. How do you ensure each revision of the layer repository maps 1:1 to a specific revision of the source repo? That's why recipes typically contain git:// uris with source revisions, or http tarballs with tarball checksums: to ensure everyone builds from the same source tree. It's typically not a good idea to refer to anything that is not a part of the layer. Alex
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