[yocto] Dependencies on other file system types for custom file system type

[Richard Purdie]

On Mon, 2019-04-15 at 21:43 +0700, Eric Grunt wrote:
> > Notice how the function names for squashfs are:
> > 
> > do_image_squashfs_xz
> > 
> > not
> > 
> > do_image_squashfs-xz
> > 
> > This is because shell functions/variables can't have "-" in their
> > name.
> > You need to change to us IMAGE_CMD_squashfs_xz_ubi.
> 
> I tried to basically change all "-" in the fs and variable names into
> "_",
> but this didn't change the behaviour.
> What I do not understand:
> The filesystem type squashfs-xz (included in poky) uses "-",
> among others also for the IMAGE_CMD name ("IMAGE_CMD_squashfs-xz").
> Only the dependencies to squashfs tools are using "_":
> do_image_squashfs_xz[depends] += "squashfs-tools-
> native:do_populate_sysroot"
> 
> In the case of squashfs_xz_ubi the IMAGE_TYPEDEP_ dependency
> to sqashfs-xz is ignored.
> (experimentally trying to change that dependency to squashfs
> (a name without "-")  does not help)

I think there is some translation code somewhere which probably
confuses things more as some bits have - and some have _. Does the
squashfs_xz image type actually work? 

Cheers,

Richard