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add helper functions to get kernel path by kernel release and the path of current running kernel 

Resolves: bz1895258
Upstream: Fedora
Conflict: None

commit 945cbbd59b
Author: Coiby Xu <coxu@redhat.com>
Date:   Tue Dec 7 15:16:07 2021 +0800

    add helper functions to get kernel path by kernel release and the path of current running kernel

    grubby --info=kernel-path or --add-kernel=kernel-path accepts a kernel
    path (e.g. /boot/vmlinuz-5.14.14-200.fc34.x86_64) instead of kernel release
    (e.g 5.14.14-200.fc34.x86_64). So we need to know the kernel path given
    a kernel release. Although for Fedora/RHEL, the kernel path is
    "/boot/vmlinuz-<KERNEL_RELEASE>", a path kernel could also be
    /boot/<machine-id>/<KERNEL_RELEASE>/vmlinuz. So the most reliable way to
    find the kernel path given a kernel release is to use "grubby --info".

    For osbuild, a kernel path may not yet exist but it's valid for
    "grubby --update-kernel=KERNEL_PATH". For example, "grubby -info" may
    output something as follows,

    index=0
    kernel="/var/cache/osbuild-worker/osbuild-store/tmp/tmp2prywdy5object/tree/boot/vmlinuz-5.15.10-100.fc34.x86_64"
    args="ro no_timer_check net.ifnames=0 console=tty1 console=ttyS0,115200n8"
    root="UUID=76a22bf4-f153-4541-b6c7-0332c0dfaeac"
    initrd="/var/cache/osbuild-worker/osbuild-store/tmp/tmp2prywdy5object/tree/boot/initramfs-5.15.10-100.fc34.x86_64.img"

    There is no need to check if path like
    /var/cache/osbuild-worker/osbuild-store/tmp/tmp2prywdy5object/tree/boot/vmlinuz-5.15.10-100.fc34.x86_64
    physically exists.

    Note these helper functions doesn't support CoreOS/Atomic/Silverblue
    since grubby isn't used by them.

    Reviewed-by: Pingfan Liu <piliu@redhat.com>
    Reviewed-by: Philipp Rudo <prudo@redhat.com>
    Signed-off-by: Coiby Xu <coxu@redhat.com>

Signed-off-by: Coiby Xu <coxu@redhat.com>
This commit is contained in:
Coiby Xu 2022-01-05 11:53:09 +08:00 committed by Tao Liu
parent d5cf913260
commit b3d9b9bd5c
1 changed files with 30 additions and 0 deletions
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30
kdumpctl
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@ -1351,6 +1351,36 @@ get_dump_mode_by_kernel()
fi
}
_filter_grubby_kernel_str()
{
local _grubby_kernel_str=$1
echo -n "$_grubby_kernel_str" | sed -n -e 's/^kernel="\(.*\)"/\1/p'
}
_find_kernel_path_by_release()
{
local _release="$1" _grubby_kernel_str _kernel_path
_grubby_kernel_str=$(grubby --info ALL | grep "^kernel=.*$_release")
_kernel_path=$(_filter_grubby_kernel_str "$_grubby_kernel_str")
if [[ -z $_kernel_path ]]; then
derror "kernel $_release doesn't exist"
return 1
fi
echo -n "$_kernel_path"
}
_get_current_running_kernel_path()
{
local _release _path
_release=$(uname -r)
if _path=$(_find_kernel_path_by_release "$_release"); then
echo -n "$_path"
else
return 1
fi
}
reset_crashkernel()
{
local kernel=$1 entry crashkernel_default