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feat(recovery): implement failsafe boot

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for TFTP or anything, really.

Signed-off-by: Raito Bezarius <masterancpp@gmail.com>
This commit is contained in:
Raito Bezarius 2024-09-07 22:28:05 +02:00
parent bc1f54e701
commit 95850a44c2
2 changed files with 33 additions and 2 deletions
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25
modules/outputs/initramfs.nix
View file

@ -41,17 +41,38 @@ in
system.outputs = {
initramfs =
let inherit (pkgs.pkgsBuildBuild) gen_init_cpio;
let
inherit (pkgs.pkgsBuildBuild) gen_init_cpio cpio writeScript;
inherit (pkgs) busybox;
failsafe-init = writeScript "init" ''
#!/bin/sh
exec >/dev/console
echo Running in initramfs
PATH=${busybox}/bin:$PATH
export PATH
mount -t proc none /proc
mount -t sysfs none /sys
${busybox}/bin/sh
'';
refs = pkgs.writeReferencesToFile busybox;
in runCommand "initramfs.cpio" {} ''
cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > $out
cat << SPECIALS | ${gen_init_cpio}/bin/gen_init_cpio /dev/stdin > out
dir /proc 0755 0 0
dir /dev 0755 0 0
nod /dev/console 0600 0 0 c 5 1
dir /target 0755 0 0
dir /target/persist 0755 0 0
dir /target/nix 0755 0 0
dir /nix 0755 0 0
dir /nix/store 0755 0 0
dir /bin 0755 0 0
file /bin/sh ${busybox}/bin/sh 0755 0 0
file /init ${pkgs.preinit}/bin/preinit 0755 0 0
file /failsafe-init ${failsafe-init} 0755 0 0
SPECIALS
find $(cat ${refs}) | ${cpio}/bin/cpio -H newc -o -A -v -O out
mv out $out
'';
systemConfiguration =
pkgs.systemconfig config.filesystem.contents;

10
pkgs/preinit/preinit.c
View file

@ -98,6 +98,7 @@ int main(int argc, char *argv[], char *envp[])
AVER(mount(opts.device, "/target/persist", opts.fstype, 0, opts.mount_opts));
} else {
if(mount(opts.device, "/target/persist", opts.fstype, 0, opts.mount_opts) < 0) {
ERR("failed to mount primary device, mount the alternative device\n");
AVER(mount(opts.altdevice, "/target/persist", opts.fstype, 0, opts.mount_opts));
}
}
@ -118,5 +119,14 @@ int main(int argc, char *argv[], char *envp[])
AVER(execve("/persist/init", argv, envp));
}
ERR("failed to mount the rootfs\n");
ERR("final stand using the failsafe initialization method\n");
ERR("the boot process is manual from now on\n");
argv[0] = "init";
argv[1] = NULL;
AVER(execve("/failsafe-init", argv, envp));
die();
}