added mkinitramfs

2 files changed, 191 insertions, 0 deletions

diff --git a/mkinitrd/initramfs-init.sh b/mkinitrd/initramfs-init.sh
new file mode 100644
index 0000000..9353e0f
--- /dev/null
+++ b/mkinitrd/initramfs-init.sh
@@ -0,0 +1,110 @@
+#!/bin/sh
+
+PATH=/bin:/usr/bin:/sbin:/usr/sbin
+export PATH
+
+echo "Loading system..."
+
+problem()
+{
+   printf "Encountered a problem!\n\nDropping you to a shell.\n\n"
+   sh
+}
+
+no_device()
+{
+   printf "The device %s, which is supposed to contain the\n" $1
+   printf "root file system, does not exist.\n"
+   printf "Please fix this problem and exit this shell.\n\n"
+}
+
+no_mount()
+{
+   printf "Could not mount device %s\n" $1
+   printf "Sleeping forever. Please reboot and fix the kernel command line.\n\n"
+   printf "Maybe the device is formatted with an unsupported file system?\n\n"
+   printf "Or maybe filesystem type autodetection went wrong, in which case\n"
+   printf "you should add the rootfstype=... parameter to the kernel command line.\n\n"
+   printf "Available partitions:\n"
+}
+
+do_mount_root()
+{
+   mkdir /.root
+   [ -n "$rootflags" ] && rootflags="$rootflags,"
+   rootflags="$rootflags$ro"
+
+   case "$root" in
+      /dev/* ) device=$root ;;
+      UUID=* ) eval $root; device="/dev/disk/by-uuid/$UUID"  ;;
+      LABEL=*) eval $root; device="/dev/disk/by-label/$LABEL" ;;
+      ""     ) echo "No root device specified." ; problem    ;;
+   esac
+
+   while [ ! -b "$device" ] ; do
+       no_device $device
+       problem
+   done
+
+   if ! mount -n -t "$rootfstype" -o "$rootflags" "$device" /.root ; then
+       no_mount $device
+       cat /proc/partitions
+       while true ; do sleep 10000 ; done
+   else
+       echo "Successfully mounted device $root"
+   fi
+}
+
+init=/sbin/init
+root=
+rootdelay=
+rootfstype=auto
+ro="ro"
+rootflags=
+device=
+
+mount -n -t devtmpfs devtmpfs /dev
+mount -n -t proc     proc     /proc
+mount -n -t sysfs    sysfs    /sys
+mount -n -t tmpfs    tmpfs    /run
+
+read -r cmdline < /proc/cmdline
+
+for param in $cmdline ; do
+  case $param in
+    init=*      ) init=${param#init=}             ;;
+    root=*      ) root=${param#root=}             ;;
+    rootdelay=* ) rootdelay=${param#rootdelay=}   ;;
+    rootfstype=*) rootfstype=${param#rootfstype=} ;;
+    rootflags=* ) rootflags=${param#rootflags=}   ;;
+    ro          ) ro="ro"                         ;;
+    rw          ) ro="rw"                         ;;
+  esac
+done
+
+# udevd location depends on version
+if [ -x /sbin/udevd ]; then
+  UDEVD=/sbin/udevd
+elif [ -x /lib/udev/udevd ]; then
+  UDEVD=/lib/udev/udevd
+elif [ -x /lib/systemd/systemd-udevd ]; then
+  UDEVD=/lib/systemd/systemd-udevd
+else
+  echo "Cannot find udevd nor systemd-udevd"
+  problem
+fi
+
+${UDEVD} --daemon --resolve-names=never
+udevadm trigger
+udevadm settle
+
+if [ -f /etc/mdadm.conf ] ; then mdadm -As                       ; fi
+if [ -x /sbin/vgchange  ] ; then /sbin/vgchange -a y > /dev/null ; fi
+if [ -n "$rootdelay"    ] ; then sleep "$rootdelay"              ; fi
+
+do_mount_root
+
+killall -w ${UDEVD##*/}
+
+exec switch_root /.root "$init" "$@"
+
diff --git a/mkinitrd/mkinitramfs.sh b/mkinitrd/mkinitramfs.sh
new file mode 100755
index 0000000..9e32cee
--- /dev/null
+++ b/mkinitrd/mkinitramfs.sh
@@ -0,0 +1,81 @@
+#!/bin/sh
+
+BUILD=/tmp/ramfs
+OUT=${1-/boot/initramfs-linux.img}
+
+
+# create base directory structure
+printf "creating directories..."
+
+[ -e $BUILD ] && rm -rf $BUILD
+mkdir -p $BUILD/tmp
+
+cd $BUILD
+mkdir -p bin dev etc lib proc run sbin sys usr
+mkdir -p lib/firmware lib/modules lib/udev
+mkdir -p etc/modprobe.d etc/udev
+
+ln -s lib lib64
+ln -s ../bin usr/bin
+ln -s ../sbin usr/sbin
+printf "OK\n"
+
+# copy binaries
+printf "populating /bin..."
+for b in dash cat cp dd killall kmod ln ls mkdir \
+    mknod mount rm sed sleep umount uname \
+    basename readlink printf echo udevadm; do
+    cp -a /bin/$b bin/
+done
+ln -s dash bin/sh
+ln -s kmod bin/insmod
+ln -s kmod bin/lsmod
+printf "OK\n"
+
+# create nodes for udev to mount
+printf "creating nodes..."
+mknod -m 600 dev/console c 5 1
+mknod -m 666 dev/null c 1 3
+printf "OK\n"
+
+# Copy udev configuration
+printf "configuring udev..."
+cp  /etc/udev/udev.conf etc/udev/
+cp -r /etc/udev/rules.d   etc/udev/
+cp -r /lib/udev/*         lib/udev/
+printf "OK\n"
+
+# set module order
+touch etc/modprobe.d/modprobe.conf
+
+# copy the init script
+printf "installing init script..."
+cp /sbin/initramfs-init sbin/init
+printf "OK\n"
+
+# copy required libraries
+printf "populating /lib..."
+for l in c acl attr blkid cap kmod lzma mount ncursesw readline z curses history zstd; do
+        cp /lib/lib$l.so lib/
+done
+ln -s libc.so /ld-musl-$(uname -m).so.1
+printf "OK\n"
+
+# copy any firmware
+[ -d /lib/firmware ] && {
+    printf "installing firmware..."
+    cp -r /lib/firmware/* lib/firmware/
+    printf "OK\n"
+}
+
+# copy any modules
+printf "installing modules..."
+cp  -r /lib/modules/* lib/modules/
+printf "OK\n"
+
+# create the initramfs image
+printf "creating initramfs image..."
+find ./ | cpio -o -H newc | gzip -9 > $OUT
+printf "OK\n"
+
+printf "Written initramfs image to $OUT\n"