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make initramfs busybox (very slightly) smaller

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Daniel Barlow 2023-04-11 23:08:02 +01:00
parent 29c7af5892
commit 9f3c80e774
1 changed files with 21 additions and 8 deletions
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29
modules/initramfs.nix
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@ -22,13 +22,20 @@ in
outputs = { outputs = {
initramfs = initramfs =
let let
bb = pkgs.busybox.override { bb1 = pkgs.busybox.override {
enableStatic = true; enableStatic = true;
enableMinimal = true; enableMinimal = true;
enableAppletSymlinks = false; enableAppletSymlinks = false;
extraConfig = '' extraConfig = ''
CONFIG_ASH y CONFIG_DESKTOP n
CONFIG_LS y CONFIG_ASH n
CONFIG_HUSH y
CONFIG_HUSH_TICK y
CONFIG_HUSH_LOOPS y
CONFIG_HUSH_CASE y
CONFIG_HUSH_ECHO y
CONFIG_HUSH_SET y
CONFIG_LN y CONFIG_LN y
CONFIG_CAT y CONFIG_CAT y
CONFIG_MOUNT y CONFIG_MOUNT y
@ -40,18 +47,23 @@ in
CONFIG_CHMOD y CONFIG_CHMOD y
CONFIG_MKDIR y CONFIG_MKDIR y
CONFIG_MKNOD y CONFIG_MKNOD y
CONFIG_SH_IS_ASH y
CONFIG_BASH_IS_NONE y CONFIG_BASH_IS_NONE y
CONFIG_SH_IS_NONE y
CONFIG_SH_IS_ASH n
CONFIG_FEATURE_SH_STANDALONE y CONFIG_FEATURE_SH_STANDALONE y
CONFIG_FEATURE_PREFER_APPLETS y CONFIG_FEATURE_PREFER_APPLETS y
CONFIG_BUSYBOX_EXEC_PATH "/bin/busybox"
''; '';
}; };
bb = bb1.overrideAttrs(o: {
makeFlags = [];
});
slashinit = pkgs.writeScript "init" '' slashinit = pkgs.writeScript "init" ''
#!/bin/sh #!/bin/hush
exec >/dev/console exec >/dev/console
echo Running in initramfs echo Running in initramfs
mount -t proc none /proc mount -t proc none /proc
set -- $(cat /proc/cmdline) set -- `cat /proc/cmdline`
for i in "$@" ; do for i in "$@" ; do
case "''${i}" in case "''${i}" in
root=*) root=*)
@ -62,7 +74,7 @@ in
echo mount -t jffs2 ''${rootdevice} /target/persist echo mount -t jffs2 ''${rootdevice} /target/persist
mount -t jffs2 ''${rootdevice} /target/persist mount -t jffs2 ''${rootdevice} /target/persist
mount -o bind /target/persist/nix /target/nix mount -o bind /target/persist/nix /target/nix
sh /target/persist/activate /target hush /target/persist/activate /target
cd /target cd /target
mount -o bind /target / mount -o bind /target /
exec chroot . /bin/init "$@" exec chroot . /bin/init "$@"
@ -80,7 +92,8 @@ in
nod /dev/console 0600 0 0 c 5 1 nod /dev/console 0600 0 0 c 5 1
dir /bin 0755 0 0 dir /bin 0755 0 0
file /bin/busybox ${bb}/bin/busybox 0755 0 0 file /bin/busybox ${bb}/bin/busybox 0755 0 0
slink /bin/sh /bin/busybox 0755 0 0 slink /bin/hush /bin/busybox 0755 0 0
slink /bin/chroot /bin/busybox 0755 0 0
file /init ${slashinit} 0755 0 0 file /init ${slashinit} 0755 0 0
SPECIALS SPECIALS
''; '';