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The initramfs is not a reall filesystem, so it does not use the
$(rootfs) infrastructure.
As a consequence, the usual rootfs-related variables are not set,
especially the name, type, and dependencies of the (non-)filesystem.
Yet, it is present in the list of rootfs to build, and thus we end
up including it in the output of show-info. But the missing variables
yield an incorrect json:
"": {
"type": "",
"virtual": false,
"version": "",
"licenses": "",
"dl_dir": "",
"install_target": ,
"install_staging": ,
"install_images": ,
"downloads": [ ],
"dependencies": [ ],
"reverse_dependencies": [ ]
},
First, the object key is empty; second, the install_target,
install_staging, and install_images values are empty, which is not
valid (if they were null, that be OK though). Third, this is clearly
the layout of a 'package' entry, not that of a 'rootfs' entry.
An option to fix that would be to actually make use of the rootfs
infra. However, that would mean doing a lot of work for nothing
(there is actually nothing to do, yet the infra would still do a lot
of preparatory and clean up work).
The alternative is pretty simple: declare and set the variables as if
it were a real filesystem, so that show-info can filter it to the
proper layout and can spit out appropriate content (even if fake).
The third option would be to teach show-info (and its internal
implementation, the macro json-info) to ignore specific cases, like
no-name items, or replace empty values with null, or whatnots. This
again would be quite a lot of work for a single occurence.
So we go for the simple faked variables.
We add linux as a dependency, so that the graph-depends also properly
represent the dependency chain, which ends up with something liKe:
ALL
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v
rootfs-initramfs
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v v
linux rootfs-cpio
which is pretty fitting in the end.
Reported-by: Thomas De Schampheleire <patrickdepinguin@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Tested-by: Thomas De Schampheleire <thomas.de_schampheleire@nokia.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
37 lines
1.3 KiB
Makefile
37 lines
1.3 KiB
Makefile
################################################################################
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#
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# Build a kernel with an integrated initial ramdisk filesystem based on cpio.
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#
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################################################################################
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# The generic fs infrastructure isn't very useful here.
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#
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# The initramfs image does not actually build an image; its only purpose is:
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# 1- to ensure rootfs.cpio is generated,
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# 2- to then rebuild the kernel with rootfs.cpio as initramfs
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#
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# Note: ordering of the dependencies is not guaranteed here, but in
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# linux/linux.mk, via the linux-rebuild-with-initramfs rule, which depends
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# on the rootfs-cpio filesystem rule.
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#
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# Note: the trick here is that we directly depend on rebuilding the Linux
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# kernel image (which itself depends on the rootfs-cpio rule), while we
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# advertise that our dependency is on the rootfs-cpio rule, which is
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# cleaner in the dependency graph.
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rootfs-initramfs: linux-rebuild-with-initramfs
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rootfs-initramfs-show-depends:
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@echo rootfs-cpio
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.PHONY: rootfs-initramfs rootfs-initramfs-show-depends
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ifeq ($(BR2_TARGET_ROOTFS_INITRAMFS),y)
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TARGETS_ROOTFS += rootfs-initramfs
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endif
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# Not using the rootfs infra, so fake the variables
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ROOTFS_INITRAMFS_NAME = rootfs-initramfs
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ROOTFS_INITRAMFS_TYPE = rootfs
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ROOTFS_INITRAMFS_DEPENDENCIES = rootfs-cpio linux
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