commit 81966b4393623e7f701213b369df0d177696d236
parent 3f0d5ef3d03678a62ec3f0c4cff9e16dc3c35638
Author: emmett1 <emmett1.2miligrams@protonmail.com>
Date: Sun, 7 Sep 2025 11:55:44 +0800
updated
Diffstat:
| M | init | | | 53 | ++++++++++++++++++++++++++--------------------------- |
| M | mkinitrd | | | 20 | +++++++++++++++----- |
2 files changed, 41 insertions(+), 32 deletions(-)
diff --git a/init b/init
@@ -2,11 +2,7 @@
/bin/busybox --install -s /bin
-clear
-
NEWROOT=/newroot
-INITRAMFS=/run/initramfs
-MEDIA=$INITRAMFS/media
init=/sbin/init
root=
rootdelay=
@@ -14,8 +10,6 @@ rootfstype=auto
ro="ro"
rootflags=
device=
-resume=
-noresume=false
mkdir -p $NEWROOT
mount -t proc proc /proc
@@ -32,8 +26,6 @@ for param in $cmdline; do
rootdelay=* ) rootdelay=${param#rootdelay=} ;;
rootfstype=*) rootfstype=${param#rootfstype=} ;;
rootflags=* ) rootflags=${param#rootflags=} ;;
- resume=* ) resume=${param#resume=} ;;
- noresume ) noresume=true ;;
ro ) ro="ro" ;;
rw ) ro="rw" ;;
shell ) shell=1 ;;
@@ -45,49 +37,56 @@ done
echo $(which mdev) > /proc/sys/kernel/hotplug
mdev -s
-# load kernel modules
+# load modules using modalias
find /sys -name 'modalias' -type f -exec cat '{}' + | sort -u | xargs modprobe -b -a 2>/dev/null
-for k in ext4 xfs btrfs f2fs jfs reiserfs vfat; do
- modprobe $k 2>/dev/null
+# load modules specific modules
+for m in virtio virtio_ring virtio_pci virtio_blk virtio_scsi nvme \
+ ata_piix sd_mod sr_mod cdrom loop squashfs isofs overlay mbcache \
+ jbd jbd2 ext2 ext3 ext4 xfs btrfs f2fs reiserfs jfs fat vfat exfat ntfs3; do
+ modprobe "$m" 2>/dev/null
done
-[ "$shell" ] && sh
+[ "$shell" ] && exec sh
[ "$rootflags" ] && rootflags="$rootflags,"
rootflags="$rootflags$ro"
case "$root" in
/dev/* ) device=$root ;;
- UUID=* ) eval $root; device="/dev/disk/by-uuid/$UUID" ;;
- PARTUUID=*) eval $root; device="/dev/disk/by-partuuid/$PARTUUID" ;;
- LABEL=* ) eval $root; device="/dev/disk/by-label/$LABEL" ;;
- "" ) echo "No root device specified." ; sh;;
+ UUID=* ) eval $root; device="$(blkid | grep "$UUID" | cut -d : -f1 | head -n1)" ;;
+ LABEL=* ) eval $root; device="$(blkid | grep "$LABEL" | cut -d : -f1 | head -n1)" ;;
+ "" ) echo "!! no root device specified" ; exec sh;;
esac
+if [ "$rootdelay" ]; then
+ while [ ! -b "$device" ] && [ $i -lt "$rootdelay" ]; do
+ echo ">> waiting for $device..."
+ sleep 1
+ i=$((i+1))
+ done
+fi
+
while [ ! -b "$device" ] ; do
- echo "device '$device' not found"
- sh
+ echo "!! device '$device' not found"
+ exec sh
done
if ! mount -n -t "$rootfstype" -o "$rootflags" "$device" $NEWROOT; then
- echo "failed to mount device '$device'"
- cat /proc/partitions
- sh
+ echo "!! failed to mount device '$device'"
+ exec sh
fi
-[ "$shell" ] && sh
+[ "$shell" ] && exec sh
mount --move /sys $NEWROOT/sys
mount --move /proc $NEWROOT/proc
mount --move /dev $NEWROOT/dev
mount --move /run $NEWROOT/run
-
# switch to newroot
-clear
-exec /bin/switch_root $NEWROOT /sbin/init $@
+exec /bin/switch_root $NEWROOT $init $@
-echo "This is the end of initramfs"
-echo "Nothing further, here's the shell"
+echo ">> this is the end of initramfs"
+echo ">> nothing further, here's the shell"
/bin/busybox sh
diff --git a/mkinitrd b/mkinitrd
@@ -1,17 +1,18 @@
#!/bin/sh
+# busybox based initramfs script
add_kmod() {
while [ "$1" ]; do
kmod=$1; shift
- path=$(busybox modinfo -k $K -F filename $kmod 2>/dev/null)
+ path=$(modinfo -k $K -F filename $kmod 2>/dev/null)
[ "$path" ] || continue
[ -f $W/$path ] && continue
add_file $path
- for firmware in $(busybox modinfo -k $K -F firmware $kmod); do
+ for firmware in $(modinfo -k $K -F firmware $kmod); do
[ -f /lib/firmware/$firmware.xz ] && add_file /lib/firmware/$firmware.xz
[ -f /lib/firmware/$firmware ] && add_file /lib/firmware/$firmware
done
- for depends in $(busybox modinfo -k $K -F depends $kmod | tr ',' ' '); do
+ for depends in $(modinfo -k $K -F depends $kmod | tr ',' ' '); do
[ "$depends" ] || continue
add_kmod $depends
done
@@ -103,6 +104,14 @@ if [ ! "$(command -v busybox)" ]; then
exit 1
fi
+# create temporary bin path for busybox's applet
+# we trying to use busybox utils as possible
+mkdir -p /tmp/busybox-bin.$$
+for a in $(busybox --list); do
+ ln -s $(command -v busybox) /tmp/busybox-bin.$$/$a
+done
+export PATH=/tmp/busybox-bin.$$:$PATH
+
if [ ! -f "$I" ]; then
echo "error: init file '$I' not found"
exit 1
@@ -121,6 +130,7 @@ ln -s lib $W/lib64
if [ "$A" ]; then
for i in /sys/module/*; do
add_kmod ${i##*/}
+ echo ${i##*/} >> $W/modules
done
else
for d in \
@@ -137,7 +147,7 @@ else
fi
add_file $M/modules.builtin
add_file $M/modules.order
-busybox depmod -b $W $K
+depmod -b $W $K
add_bin busybox
add_file $I / 755
@@ -146,6 +156,6 @@ echo '$MODALIAS=.* 0:0 660 @modprobe "$MODALIAS' > $W/etc/mdev.conf
( cd $W ; find . | cpio -o -H newc --quiet | gzip -9 ) > "$O"
du -sh "$O"
-rm -rf $W
+rm -rf $W /tmp/busybox-bin.$$
exit 0
