Make build/filesystem.bin and build/initfs.tag targets .PHONY

[ids1024]

This needs to be run to check for updates in the cookbook.

A more ideal solution would only rebuild these files if the cookbook updated a package; I don't know how best to implement that though.

[jackpot51]

I would prefer a rebuild target that removes those two files, and then runs make

[ids1024]

I don't know; it seems rather unintuitive if make ignores changes to userspace code.

[jackpot51]

You could add FORCE to the prerequisites of build/initfs.tag and build/filesystem.bin

Phony is for targets that are not files

[ids1024]

I know that's the primary use of .PHONY, but it seems appropriate here.

I haven't heard of FORCE, but the GNU make manual says this about it (https://www.gnu.org/software/make/manual/html_node/Force-Targets.html):

Using ‘.PHONY’ is more explicit and more efficient. However, other versions of make do not support ‘.PHONY’; thus ‘FORCE’ appears in many makefiles.