busybox mdev and mdevd support
This commit is contained in:
illiliti
parent
21a3b5e176
commit
3200b2da25
9
config
9
config
@ -14,6 +14,15 @@ root="UUID=07729c48-25d8-4096-acaf-ce5322915680"
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# root mount options
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#root_args=""
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# mdevd support
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use_mdevd=0
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# busybox mdev support
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use_mdev=1
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# udev support
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use_udev=0
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# drivers
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#drivers=""
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122
generate
122
generate
@ -28,87 +28,97 @@ fi
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tmpdir="$(mktemp -d /tmp/initramfs.XXXXXXXX)"
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kernel="$(uname -r)"
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moddir="/lib/modules"
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binaries="./busybox findfs blkid udevd udevadm mount modprobe umount $binaries"
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binaries="./busybox findfs blkid mount modprobe umount $binaries"
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# structure
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for d in dev var run etc usr/lib usr/bin mnt/root proc root sys; do
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for d in dev tmp var run etc usr/lib usr/bin mnt/root proc root sys; do
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mkdir -p "$tmpdir/$d"
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done
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# symlinks
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( cd "$tmpdir" && {
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ln -s "usr/lib" "lib"
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ln -s "usr/lib" "lib64"
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ln -s "usr/bin" "bin"
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ln -s "usr/bin" "sbin"
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ln -s usr/lib lib
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ln -s usr/lib lib64
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ln -s usr/bin bin
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ln -s usr/bin sbin
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ln -s ../run var/run
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cd "$tmpdir/usr"
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ln -s "bin" "sbin"
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ln -s "lib" "lib64"
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ln -s bin sbin
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ln -s lib lib64
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} )
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# TODO parse fstab | crypttab
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#while [ "$use_fstab" -eq 1 ] && read fs dir type opts; do thing; done < /etc/fstab
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# TODO implement busybox mdev/mdevd
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# install mdev
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#mkdir "$tmpdir/usr/lib/mdev"
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#cp ./mdev/mdev.conf ./mdev/passwd ./mdev/group "$tmpdir/etc"
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#cp ./mdev/usbdev ./mdev/usbdisk_link ./mdev/ide_links "$tmpdir/usr/lib/mdev"
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#chmod +x $tmpdir/usr/lib/mdev/*
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# handle device managers
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if [ "$use_mdevd" = 1 ]; then
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# install mdevd
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binaries="mdevd mdevd-coldplug $binaries"
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mkdir "$tmpdir/lib/mdev"
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cp mdev.conf "$tmpdir/etc"
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cp storage-device "$tmpdir/lib/mdev"
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chmod +x "$tmpdir/lib/mdev/storage-device"
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elif [ "$use_mdev" = 1 ]; then
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# install mdev
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mkdir "$tmpdir/lib/mdev"
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cp mdev.conf "$tmpdir/etc"
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cp storage-device "$tmpdir/lib/mdev"
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chmod +x "$tmpdir/lib/mdev/storage-device"
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elif [ "$use_udev" = 1 ]; then
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# install udev
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binaries="udevd udevadm dmsetup $binaries"
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find /usr/lib/udev -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$tmpdir"
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fi
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# install udev
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find "/usr/lib/udev" -type f | grep -v "rc_keymaps\|hwdb.d" | cpio -pd "$tmpdir"
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cat <<EOF > "$tmpdir/etc/group"
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root:x:0:
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tty:x:5:
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dialout:x:11:
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uucp:x:14:
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kmem:x:3:
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input:x:25:
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video:x:13:
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audio:x:12:
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lp:x:10:
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disk:x:9:
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cdrom:x:16:
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tape:x:6:
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kvm:x:24:
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floppy:x:8:
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EOF
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#cat <<EOF > "$tmpdir/etc/group"
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#root:x:0:
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#tty:x:5:
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#dialout:x:11:
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#kmem:x:3:
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#input:x:25:
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#video:x:13:
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#audio:x:12:
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#lp:x:10:
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#disk:x:9:
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#cdrom:x:16:
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#tape:x:6:
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#kvm:x:24:
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#floppy:x:8:
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#EOF
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#cat <<EOF > "$tmpdir/etc/passwd"
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#root:x:0:0::/root:/bin/sh
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#nobody:x:99:99::/dev/null:/bin/false
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#EOF
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cat <<EOF > "$tmpdir/etc/passwd"
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root:x:0:0::/root:/bin/sh
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nobody:x:99:99::/:/bin/false
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EOF
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# handle lvm
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if [ "$use_lvm" = 1 ] && [ -x "$(command -v lvm)" ]; then
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binaries="lvm dmsetup $binaries"
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mkdir "$tmpdir/etc/lvm"
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binaries="lvm $binaries"
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#mkdir "$tmpdir/etc/lvm"
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# avoid lvmetad warning message
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echo "use_lvmetad = 0" >> "$tmpdir/etc/lvm/lvm.conf"
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if [ "$lvm_discard" = 1 ]; then
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echo "issue_discards = 1" >> "$tmpdir/etc/lvm/lvm.conf"
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fi
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# use_lvmetad = 0 - avoid lvmetad missing warning message
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#cat <<EOF > "$tmpdir/etc/lvm/lvmlocal.conf"
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#local {
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# issue_discards = ${lvm_discard:-0}
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# use_lvmetad = 0
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#}
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#EOF
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# TODO implement use_lvmconf
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fi
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# handle luks
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if [ "$use_luks" = 1 ] && [ -x "$(command -v cryptsetup)" ]; then
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binaries="cryptsetup dmsetup $binaries"
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binaries="cryptsetup $binaries"
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# avoid locking directory missing warning message
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mkdir "$tmpdir/run/cryptsetup"
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# TODO get rid of this workaround
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# workaround for luks2
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cp "$(readlink -f libgcc_s.so.1)" "$tmpdir/usr/lib"
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cp -a /usr/lib/libgcc_s.so.1 "$tmpdir/usr/lib"
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cp /usr/lib/libgcc_s.so.1 "$tmpdir/usr/lib"
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if [ "$luks_discard" = 1 ]; then
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luks_args="--allow-discards $luks_args"
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fi
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[ "$luks_discard" = 1 ] && luks_args="--allow-discards $luks_args"
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# TODO detached header
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# TODO keyfile
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@ -158,10 +168,13 @@ for b in $(echo $binaries); do
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# check symlink
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if [ -h "$l" ]; then
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# check lib already existence
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if [ ! -e "$tmpdir/usr/lib/${l##*/}" ] && [ ! -e "$tmpdir/usr/lib/$(readlink $l)" ]; then
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if [ ! -e "$tmpdir/usr/lib/${l##*/}" ] && [ ! -e "$tmpdir$(readlink -f $l)" ]; then
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# regular
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cp "$(readlink -f $l)" "$tmpdir/usr/lib"
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strip -s "$tmpdir/usr/lib/$(readlink $l)"
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strip -s "$tmpdir$(readlink -f $l)"
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# TODO handle all symlinks
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# symlink may link to symlink
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[ -h "/usr/lib/$(readlink $l)" ] && cp -a "/usr/lib/$(readlink $l)" "$tmpdir/usr/lib"
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# symlink
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cp -a "$l" "$tmpdir/usr/lib"
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fi
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@ -183,14 +196,15 @@ cat <<EOF > "$tmpdir/config"
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root="$root"
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root_type="$root_type"
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root_args="$root_args"
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use_mdevd="$use_mdevd"
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use_mdev="$use_mdev"
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use_udev="$use_udev"
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#drivers="$drivers"
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use_lvm="$use_lvm"
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lvm_discard="$lvm_discard"
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use_luks="$use_luks"
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luks_root="$luks_root"
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luks_header="$luks_header"
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luks_keyfile="$luks_keyfile"
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luks_discard="$luks_discard"
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luks_args="$luks_args"
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EOF
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65
init
65
init
@ -9,7 +9,9 @@ set -x
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panic() { echo "bruh moment :(" && sh; }
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# silence is golden
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#echo 0 > /proc/sys/kernel/printk
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#echo 0 >/proc/sys/kernel/printk
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# TODO parse /proc/cmdline
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# check config
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[ -f /config ] && . /config || panic
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@ -19,18 +21,49 @@ mount -t proc none /proc
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mount -t sysfs none /sys
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mount -t devtmpfs none /dev
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# TODO implement busybox mdev/mdevd
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# setup mdev
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#echo /sbin/mdev >/proc/sys/kernel/hotplug
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#mdev -s
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# handle device managers
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if [ "$use_mdevd" = 1 ]; then
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# setup mdevd
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mdevd &
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# trigger uevents
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mdevd-coldplug
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# setup udev
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udevd --daemon
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udevadm trigger --action=add --type=subsystems
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udevadm trigger --action=add --type=devices
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udevadm settle
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# TODO investigate this
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# avoid race condition
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sleep 1.5
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elif [ "$use_mdev" = 1 ]; then
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# setup mdev
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if [ -e /proc/sys/kernel/hotplug ]; then
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echo /sbin/mdev >/proc/sys/kernel/hotplug
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else
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uevent mdev &
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fi
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# TODO parse /proc/cmdline
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# trigger mdev
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mdev -s
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# trigger uevent for usb devices
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for u in /sys/bus/usb/devices/*; do
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case ${u##*/} in
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[0-9]*-[0-9]*)
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echo add > "$u/uevent"
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;;
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esac
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done
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# load drivers
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find /sys -name 'modalias' -type f -exec cat '{}' + | sort -u | xargs modprobe -ba
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elif [ "$use_udev" = 1 ]; then
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# setup udev
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udevd --daemon
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udevadm trigger --action=add --type=subsystems
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udevadm trigger --action=add --type=devices
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udevadm settle
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else
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panic
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fi
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# TODO handle situations when LUKS on LVM
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# unlock cryptsetup container
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[ "$use_luks" = 1 ] && {
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@ -39,8 +72,10 @@ udevadm settle
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cryptsetup $luks_args luksOpen "$luks_root" luks_root || panic
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}
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# load drivers
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#modprobe -a $drivers
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# manually trigger LVM if udev disabled
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[ "$use_lvm" = 1 ] && [ "$use_udev" = 0 ] && {
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lvm vgchange --sysinit -a y
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}
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# merge mount flags
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[ -n "$root_args" ] && mount_args="$root_args"
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@ -50,7 +85,9 @@ udevadm settle
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mount $mount_args "$root" /mnt/root || panic
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# clean up
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udevadm control --exit
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[ "$use_mdevd" = 1 ] && killall mdevd
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[ "$use_mdev" = 1 ] && { echo "" >/proc/sys/kernel/hotplug || killall uevent; }
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[ "$use_udev" = 1 ] && udevadm control --exit
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umount /dev /sys /proc
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# boot system
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136
mdev.conf
Normal file
136
mdev.conf
Normal file
@ -0,0 +1,136 @@
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# Copyright (c) 2012-2019, Piotr Karbowski <piotr.karbowski@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are
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# permitted provided that the following conditions are met:
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#
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# * Redistributions of source code must retain the above copyright notice, this list
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# of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright notice, this list
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# of conditions and the following disclaimer in the documentation and/or other
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# materials provided with the distribution.
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# * Neither the name of the Piotr Karbowski nor the names of its contributors may be
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# used to endorse or promote products derived from this software without specific
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# prior written permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
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# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
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# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
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# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US
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# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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# mdev-like-a-boss
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# Syntax:
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# [-]devicename_regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]$ENVVAR=regex user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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# [-]@maj,min[-min2] user:group mode [=path]|[>path]|[!] [@|$|*cmd args...]
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#
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# [-]: do not stop on this match, continue reading mdev.conf
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# =: move, >: move and create a symlink
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# !: do not create device node
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# @|$|*: run cmd if $ACTION=remove, @cmd if $ACTION=add, *cmd in all cases
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# support module loading on hotplug
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$MODALIAS=.* 0:0 660 @modprobe -b "$MODALIAS"
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# null may already exist; therefore ownership has to be changed with command
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null 0:0 666 @chmod 666 $MDEV
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zero 0:0 666
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full 0:0 666
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random 0:0 444
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urandom 0:0 444
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hwrandom 0:0 444
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grsec 0:0 660
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# Kernel-based Virtual Machine.
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#kvm root:kvm 660
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# vhost-net, to be used with kvm.
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#vhost-net root:kvm 660
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kmem 0:0 640
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mem 0:0 640
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port 0:0 640
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# console may already exist; therefore ownership has to be changed with command
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console 0:5 600 @chmod 600 $MDEV
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ptmx 0:5 666
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pty.* 0:5 660
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# Typical devices
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tty 0:5 666
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tty[0-9]* 0:5 660
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vcsa*[0-9]* 0:5 660
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ttyS[0-9]* 0:14 660
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# block devices
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ram([0-9]*) 0:9 660 >rd/%1
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loop([0-9]+) 0:9 660 >loop/%1
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sr[0-9]* 0:16 660 @ln -sf $MDEV cdrom
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fd[0-9]* 0:8 660
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SUBSYSTEM=block;.* 0:9 660 */lib/mdev/storage-device
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# Run settle-nics every time new NIC appear.
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# If you don't want to auto-populate /etc/mactab with NICs, run 'settle-nis' without '--write-mactab' param.
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#-SUBSYSTEM=net;DEVPATH=.*/net/.*;.* 0:0 600 @/lib/mdev/settle-nics --write-mactab
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#net/tun[0-9]* root:kvm 660
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#net/tap[0-9]* 0:0 600
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# alsa sound devices and audio stuff
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#SUBSYSTEM=sound;.* root:audio 660 @/lib/mdev/sound-control
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#adsp root:audio 660 >sound/
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#audio root:audio 660 >sound/
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#dsp root:audio 660 >sound/
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#mixer root:audio 660 >sound/
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#sequencer.* root:audio 660 >sound/
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# raid controllers
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cciss!(.*) 0:9 660 =cciss/%1
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ida!(.*) 0:9 660 =ida/%1
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rd!(.*) 0:9 660 =rd/%1
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#fuse 0:0 666
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card[0-9] 0:13 660 =dri/
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agpgart 0:0 660 >misc/
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psaux 0:0 660 >misc/
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rtc 0:0 664 >misc/
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# input stuff
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SUBSYSTEM=input;.* 0:25 660
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# v4l stuff
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#vbi[0-9] 0:13 660 >v4l/
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#video[0-9] 0:13 660 >v4l/
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# dvb stuff
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#dvb.* 0:13 660
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# drm etc
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dri/.* 0:13 660
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# Don't create old usbdev* devices.
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usbdev[0-9].[0-9]* 0:0 660 !
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# Stop creating x:x:x:x which looks like /dev/dm-*
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[0-9]+\:[0-9]+\:[0-9]+\:[0-9]+ 0:0 660 !
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# /dev/cpu support.
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microcode 0:0 600 =cpu/
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cpu([0-9]+) 0:0 600 =cpu/%1/cpuid
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msr([0-9]+) 0:0 600 =cpu/%1/msr
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# Populate /dev/bus/usb.
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#SUBSYSTEM=usb;DEVTYPE=usb_device;.* 0:0 660 */lib/mdev/dev-bus-usb
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# Catch-all other devices, Right now useful only for debuging.
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#.* 0:0 660 */opt/mdev/helpers/catch-all
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128
storage-device
Executable file
128
storage-device
Executable file
@ -0,0 +1,128 @@
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#!/bin/sh
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# Copyright (c) 2012-2019, Piotr Karbowski <piotr.karbowski@gmail.com>
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without modification, are
|
||||
# permitted provided that the following conditions are met:
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#
|
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# * Redistributions of source code must retain the above copyright notice, this list
|
||||
# of conditions and the following disclaimer.
|
||||
# * Redistributions in binary form must reproduce the above copyright notice, this list
|
||||
# of conditions and the following disclaimer in the documentation and/or other
|
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# materials provided with the distribution.
|
||||
# * Neither the name of the Piotr Karbowski nor the names of its contributors may be
|
||||
# used to endorse or promote products derived from this software without specific
|
||||
# prior written permission.
|
||||
#
|
||||
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
||||
# EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
# MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
||||
# THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
|
||||
# OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
||||
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE US
|
||||
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
# This script meant to create /dev/disk/by-* and /dev/mapper/* symlinks.
|
||||
# and remove them after storage device is removed.
|
||||
# the /dev/disk/by-* handling based on the idea and proof of concept from BitJam.
|
||||
|
||||
# debug
|
||||
#exec >> /run/debug-mdev 2>&1
|
||||
#set -x
|
||||
#echo '### ENV:'
|
||||
#env
|
||||
#echo '### CODE:'
|
||||
#
|
||||
|
||||
umask 077
|
||||
|
||||
storage_dir="/dev/.mdev-like-a-boss"
|
||||
[ -d "${storage_dir}" ] || mkdir "${storage_dir}"
|
||||
|
||||
[ "${MDEV}" ] || exit 2
|
||||
|
||||
create_uuid_label_symlink() {
|
||||
local target_dir="/dev/disk/by-${1}"
|
||||
local target_symlink="${target_dir}/${2}"
|
||||
[ -e "${target_symlink}" ] && return
|
||||
mkdir -p "${target_dir}"
|
||||
ln -snf "/dev/${MDEV}" "${target_symlink}"
|
||||
echo "${target_symlink}" >"${storage_dir}/storage_symlink_${1}_${MDEV}"
|
||||
}
|
||||
|
||||
add_symlinks() {
|
||||
# Skip temp cryptsetup nodes.
|
||||
case "${MDEV}" in
|
||||
'dm-'[0-9]*)
|
||||
case "$(cat "/sys/block/${MDEV}/dm/name")" in
|
||||
'temporary-cryptsetup-'[0-9]*)
|
||||
return 0
|
||||
;;
|
||||
esac
|
||||
;;
|
||||
esac
|
||||
|
||||
if command -v blkid >/dev/null 2>&1; then
|
||||
local field name value UUID LABEL TYPE PTTYPE PARTUUID
|
||||
local blkid_output="$(blkid "/dev/${MDEV}")"
|
||||
eval "${blkid_output#*: }"
|
||||
|
||||
[ "${UUID}" ] && create_uuid_label_symlink 'uuid' "${UUID}"
|
||||
[ "${LABEL}" ] && create_uuid_label_symlink 'label' "${LABEL}"
|
||||
[ "${PARTUUID}" ] && create_uuid_label_symlink 'partuuid' "${PARTUUID}"
|
||||
fi
|
||||
|
||||
if [ -f "/sys/block/${MDEV}/dm/name" ]; then
|
||||
[ -d '/dev/mapper' ] || mkdir '/dev/mapper'
|
||||
if ! [ -c '/dev/mapper/control' ]; then
|
||||
awk '$2 == "device-mapper" { foo = system("mknod /dev/mapper/control c 10 " $1); exit foo }' /proc/misc || exit 1
|
||||
fi
|
||||
local dmname="$(cat "/sys/block/${MDEV}/dm/name")"
|
||||
if [ "${dmname}" ]; then
|
||||
local target_symlink="/dev/mapper/${dmname}"
|
||||
[ -e "${target_symlink}" ] && return
|
||||
ln -snf "/dev/${MDEV}" "${target_symlink}"
|
||||
echo "${target_symlink}" >"${storage_dir}/storage_symlink_mapper_${MDEV}"
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
set_readahead() {
|
||||
read_ahead_kb_control="/sys/class/block/${MDEV}/queue/read_ahead_kb"
|
||||
new_read_ahead_kb="2048"
|
||||
if [ -f "${read_ahead_kb_control}" ]; then
|
||||
read_ahead_kb="$(cat "${read_ahead_kb_control}")"
|
||||
if [ "${read_ahead_kb}" -lt "${new_read_ahead_kb}" ]; then
|
||||
logger -t mdev "Changing ${MDEV} read_ahead_kb from ${read_ahead_kb} to ${new_read_ahead_kb}"
|
||||
echo -n "${new_read_ahead_kb}" >"${read_ahead_kb_control}"
|
||||
fi
|
||||
fi
|
||||
}
|
||||
|
||||
drop_symlinks() {
|
||||
local type
|
||||
for type in uuid label mapper; do
|
||||
[ -f "${storage_dir}/storage_symlink_${type}_${MDEV}" ] || continue
|
||||
local target_symlink="$(cat "${storage_dir}/storage_symlink_${type}_${MDEV}" 2>/dev/null)"
|
||||
[ "${target_symlink}" ] || continue
|
||||
|
||||
local target_symlink_device="$(readlink "${target_symlink}")"
|
||||
if [ "${target_symlink_device}" = "/dev/${MDEV}" ]; then
|
||||
rm "${target_symlink}"
|
||||
fi
|
||||
rm "${storage_dir}/storage_symlink_${type}_${MDEV}"
|
||||
done
|
||||
}
|
||||
|
||||
case "${ACTION}" in
|
||||
'add'|'')
|
||||
add_symlinks
|
||||
set_readahead
|
||||
;;
|
||||
'remove')
|
||||
drop_symlinks
|
||||
;;
|
||||
esac
|
||||
|
||||
Loading…
Reference in New Issue
Block a user