sifive builds don't update from overlay directory

[dkohlbre]

If you build using cmake -DLINUX_SIFIVE=y, any future modifications to the overlay/ directory will not be picked up in the resulting image. (Note that a non-sifive build works fine)

e.g.

mkdir build; cd build
cmake ../
make
./scripts/run-qemu.sh check files in root, no file $foo
touch overlay/root/$foo
make
./scripts/run-qemu.sh check files in root, $foo found

vs

mkdir build; cd build
cmake ../ -DLINUX_SIFIVE=y
make
./scripts/run-qemu.sh check files in root, no file $foo
touch overlay/root/$foo
make
./scripts/run-qemu.sh check files in root, no $foo found

I suspect this is actually an issue with initramfs builds.

[dayeol]

@dkohlbre Plz link commits and close the issue if it was resolved. Thanks!

[dkohlbre]

This is a new issue and is unresolved.

[dkohlbre]

Ok, this occurs when initramfs is enabled, and is entirely related to how Linux gets built. Buildroot copies files/etc correctly, the initramfs data doesn't see changes.

[dkohlbre]

As a temporary fix, you can delete the entire linux.build dir, which will cause the next build to be much longer, but pickup new files from overlay

[dayeol]

I was able to figure out,

e9fde5d#diff-af3b638bc2a3e6c650974192a53c7291R196

This change makes linux target not build vmlinux images again if they already exist.
Although sysroot and overlay are defined as dependencies in add_custom_command, it is not picked up.

[dayeol]

Closing