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Support for booting without initramfs (rebased) #1401

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Support for booting without initramfs (rebased) #1401

wants to merge 5 commits into from

Commits on Jan 9, 2018

  1. ostree-prepare-root: enabler for simpler kernel arg 

    With the current approach, when ostree-prepare-root is used
on the kernel command line as init=, it always assumes that
the next value in the argument list is a path to the sysroot.
The code for falling back to a default path (if none is provided),
would only work if init= is the last arg in the argument list.
We can not rely on that and have to explicitly provide the
path to the sysroot. Which defeats the purpose of a default
path selection code.

To keep command line neater assume that sysroot is on / when
using ostree-prepare-root as init. This probably is what most
people want anyways. Also _ostree_kernel_args* API assumes
that args are space separated list. Which is problematic for:
"init=${ostree}/usr/lib/ostree/ostree-prepare-root /" as it
gets split in two.
    @gatispaeglis @wmanley
    gatispaeglis authored and wmanley committed Jan 9, 2018
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  2. deploy: add --karg-none argument 

    If the current deployment has "rootwait root=/dev/sda2",
but the new deployment does not need "rootwait" anymore,
there is no way to clear this arg at the moment (as opposed
to "karg=root=", which overrides any earlier argument with
the same name). With "--karg-none" users can now clear all
the previous args and set new "root=":

ostree admin deploy --karg-none --karg=root=LABEL=rootfs
    @gatispaeglis @wmanley
    gatispaeglis authored and wmanley committed Jan 9, 2018
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  3. Support for booting without initramfs 

    Previously when initramfs-* was not found in a deployment's
boot directory, it was assumed that rootfs is prepared for
ostree booting by a kernel patch.

With this patch, the behaviour changes to be - if initramfs-*
is not found, assume that system is using a static
ostree-prepare-root as init process. Booting without initramfs
is a common use case on embedded systems. This approach is
also more convenient, than having to patch the kernel.
    @gatispaeglis @wmanley
    gatispaeglis authored and wmanley committed Jan 9, 2018
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  4. ostree-grub-generator: update outdated comment

    @gatispaeglis @wmanley
    gatispaeglis authored and wmanley committed Jan 9, 2018
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  5. Tests: test-no-initramfs: Test both legacy and new kernel locations

    @wmanley
    wmanley committed Jan 9, 2018
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