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Rename pkg/kernel to pkg/build and prepare for multi-OS support.
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Pass target OS/arch and VM type to kernel.CreateImage.
Use nbd for gce and loop for qemu VM type.
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loop devices are nice, but unfortunately this creates images
that does not boot on GCE. Reason is unclear.
Revert back to nbd for now.
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loop is much more standard than nbd and does not require additional modules.
nbd broke on Debian rolling.
loop also allows parallel execution thanks to losetup -f.
Use loop instead of nbd.
Also improve cleanup logic and add one missing sudo.
Update #501
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On most distributions default grub target is i386-pc, which works.
However, on some default is x86_64-efi, which fails with:
grub-install: error: cannot find EFI directory.
Explicitly specify i386-pc target.
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If the script is aborted at an unfortunate point, it leaves the whole system broken.
E.g. we've seen that fdisk cannot update partition table until the next reboot.
If you really need to kill it, use a different signal. But better wait.
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Allow to specify per-kernel command line and sysctl values
to more closely mimic the target kernel.
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vm/gce differs from other VM types in that it accepts image
in a weird, GCE-specific format (namely, image named disk.raw
is put into .tar.gz file). This makes it impossible to write
generic code that creates images for any VM types.
Make vm/gce accept just image like e.g. vm/qemu
and handle own specifics internally.
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Normally config is applied on top of defconfig+kvmconfig.
This allows to provide full config that is used unmodified.
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Move functionality to build kernel/image
from syz-gce to a separate package.
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