From b3312f86061a0d887233f5068cbc335aa2612bed Mon Sep 17 00:00:00 2001
From: Jonathan Bauer
Date: Wed, 6 May 2015 18:13:52 +0200
Subject: current state: udev disk detection still not done! also improved
 module structure and code commentary

---
 testModule/hooks/cmdline/enable-sysrq.sh           |  2 +
 testModule/hooks/cmdline/expand-kcl-ip.sh          | 20 +++++++++
 testModule/hooks/cmdline/mark-root-device.sh       |  9 ++++
 testModule/hooks/mount/mount-root-device.sh        |  4 ++
 testModule/hooks/pre-mount/mount-qcow.sh           | 49 ++++++++++++++++++++++
 testModule/hooks/pre-pivot/mount-tmp.sh            | 38 +++++++++++++++++
 .../hooks/pre-udev/load-dnbd3-nbd-modules.sh       | 32 ++++++++++++++
 7 files changed, 154 insertions(+)
 create mode 100755 testModule/hooks/cmdline/enable-sysrq.sh
 create mode 100755 testModule/hooks/cmdline/expand-kcl-ip.sh
 create mode 100755 testModule/hooks/cmdline/mark-root-device.sh
 create mode 100755 testModule/hooks/mount/mount-root-device.sh
 create mode 100755 testModule/hooks/pre-mount/mount-qcow.sh
 create mode 100755 testModule/hooks/pre-pivot/mount-tmp.sh
 create mode 100755 testModule/hooks/pre-udev/load-dnbd3-nbd-modules.sh

(limited to 'testModule/hooks')

diff --git a/testModule/hooks/cmdline/enable-sysrq.sh b/testModule/hooks/cmdline/enable-sysrq.sh
new file mode 100755
index 00000000..f779aa7a
--- /dev/null
+++ b/testModule/hooks/cmdline/enable-sysrq.sh
@@ -0,0 +1,2 @@
+# enables magic sysrq keys
+echo 1 > /proc/sys/kernel/sysrq
diff --git a/testModule/hooks/cmdline/expand-kcl-ip.sh b/testModule/hooks/cmdline/expand-kcl-ip.sh
new file mode 100755
index 00000000..8be1c718
--- /dev/null
+++ b/testModule/hooks/cmdline/expand-kcl-ip.sh
@@ -0,0 +1,20 @@
+# fakes the cmdline to fix the ip parsing when using
+# syslinux's IPAPPEND 1 mask
+[ -d /fake ] || mkdir /fake
+
+# need to be a tmpfs for the hack to work
+mount -t tmpfs tmpfs /fake
+
+# append ':hiwi:eth0:none' to the 'ip=' parameter we got
+# from syslinux's IPAPPEND 1
+sed 's/\(ip=\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}:\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}:\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}:\([0-9]\{1,3\}\.\)\{3\}[0-9]\{1,3\}\)/\1:hiwi:eno1:none/' /proc/cmdline > /fake/cmdline
+
+# bind mount it. Can we trust mount return codes here?
+# # if so, we should check what we get in $?
+mount -o bind /fake/cmdline /proc/cmdline
+
+# check if it worked
+if ! grep 'hiwi:eth0:none' /proc/cmdline; then
+	command -v warn >/dev/null || . /lib/dracut-lib.sh
+	warn 'Haxing cmdline did not work :( sad pandaz...'
+fi
diff --git a/testModule/hooks/cmdline/mark-root-device.sh b/testModule/hooks/cmdline/mark-root-device.sh
new file mode 100755
index 00000000..b7282521
--- /dev/null
+++ b/testModule/hooks/cmdline/mark-root-device.sh
@@ -0,0 +1,9 @@
+# set rootok and root as dracut expects them to be set by
+# the module preparing the root filesystem.
+#
+# Once the root filesystem is mounted per dnbd3 and
+# exported as qcow2 per nbd, /dev/root will be a symlink
+# to /dev/nbd0 as this is then our rootfs-device
+rootok=1
+root=block:/dev/root
+
diff --git a/testModule/hooks/mount/mount-root-device.sh b/testModule/hooks/mount/mount-root-device.sh
new file mode 100755
index 00000000..d02f9002
--- /dev/null
+++ b/testModule/hooks/mount/mount-root-device.sh
@@ -0,0 +1,4 @@
+# this rudimentary script just mounts the rootfs device that was symlinked to
+# /dev/root to dracut's $NEWROOT (usually /sysroot).
+
+mount /dev/root $NEWROOT
diff --git a/testModule/hooks/pre-mount/mount-qcow.sh b/testModule/hooks/pre-mount/mount-qcow.sh
new file mode 100755
index 00000000..d70492bf
--- /dev/null
+++ b/testModule/hooks/pre-mount/mount-qcow.sh
@@ -0,0 +1,49 @@
+###############################################################################
+# CHECKS
+#
+
+SETUP_ROOTFS_SCRIPT="/sbin/setup-qcow2"
+
+if [ ! -e "${SETUP_ROOTFS_SCRIPT}" ]; then
+	warn "No such file of directory: ${SETUP_ROOTFS_SCRIPT}"
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+if [ ! -x "${SETUP_ROOTFS_SCRIPT}" ]; then
+	warn "Cannot execute: ${SETUP_ROOTFS_SCRIPT}"
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+#
+# END CHECKS
+###############################################################################
+
+###############################################################################
+# MAIN CODE
+#
+
+# ok, let's source the setup script
+if ! . ${SETUP_ROOTFS_SCRIPT} ; then
+	warn "Could not source: ${SETUP_ROOTFS_SCRIPT}"
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+# just go over the functions in the right order ;-)
+for fun in connect_dnbd3 create_qcow export_qcow connect_qcow; do
+	if ! $fun; then
+		# something failed, drop a shell for debugging
+		warn "'$fun' failed with: $?"
+		emergency_shell -n "Error in $fun"
+		return 1
+	fi
+done
+
+# all good, we are done
+return 0
+
+#
+# END MAIN CODE
+###############################################################################
diff --git a/testModule/hooks/pre-pivot/mount-tmp.sh b/testModule/hooks/pre-pivot/mount-tmp.sh
new file mode 100755
index 00000000..152c844e
--- /dev/null
+++ b/testModule/hooks/pre-pivot/mount-tmp.sh
@@ -0,0 +1,38 @@
+# This script only checks if we found a usable partition for the
+# future /tmp. The discovery of that partition is done by udev during
+# the initqueue. If a valid partition is found (either GPT with the label
+# OPENSLX_TMP or MBR with the type 0x44) its path will be written to
+# /tmp/openslx.tmpdisk
+OPENSLX_TMP_DISK_FLAG="/tmp/openslx.tmpdisk"
+
+if [ ! -e "$OPENSLX_TMP_DISK_FLAG" ]; then
+	warn "'$OPENSLX_TMP_DISK_FLAG' not found!"
+	warn "Systemd will manage $NEWROOT/tmp on its own."
+	# no partition for the future /tmp found, just
+	# let systemd manage it then (probably a tmpfs)
+	return 1
+fi
+
+# in /tmp/openslx.disk.tmp is the name of the device
+# to mount as /tmp in the real system
+# meaning we need to mount it to /sysroot/tmp here.
+
+OPENSLX_TMP_DISK_DEV="$(cat $OPENSLX_TMP_DISK_FLAG)"
+
+# sanity check: is the content a block device?
+if [ ! -b "$OPENSLX_TMP_DISK_DEV" ]; then
+	warn "'$OPENSLX_TMP_DISK_DEV' appears not to be a block device!"
+	warn "Systemd will manage $NEWROOT/tmp on its own."
+	return 1
+fi
+
+# all good, keep on
+if ! mount -t auto "$OPENSLX_TMP_DISK_DEV" /sysroot/tmp; then
+	# something else went wrong :(
+	warn "Mounting '$OPENSLX_TMP_DISK_DEV' to '/sysroot/tmp' failed with: $!"
+	warn "Systemd will manage $NEWROOT/tmp on its own."
+	return 1
+fi
+
+# still here? mount worked wohoo
+return 0
diff --git a/testModule/hooks/pre-udev/load-dnbd3-nbd-modules.sh b/testModule/hooks/pre-udev/load-dnbd3-nbd-modules.sh
new file mode 100755
index 00000000..29f9f210
--- /dev/null
+++ b/testModule/hooks/pre-udev/load-dnbd3-nbd-modules.sh
@@ -0,0 +1,32 @@
+# include dracut-lib.sh to use 'warn'
+command -v warn >/dev/null || . /lib/dracut-lib.sh
+
+NBD_MOD_PATH="/usr/lib/modules/current/extra/nbd.ko"
+DNBD3_MOD_PATH="/usr/lib/modules/current/extra/dnbd3.ko"
+
+# do we actually have our modules?
+if [ ! -e "${NBD_MOD_PATH}" ]; then
+	warn "No such file of directory: ${NBD_MOD_PATH}"
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+if [ ! -e "${DNBD3_MOD_PATH}" ]; then
+	warn "No such file of directory: ${DNBD3_MOD_PATH}"
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+# load the kernel modules for dnbd3 and nbd
+if ! insmod "${DNBD3_MOD_PATH}"; then
+	warn "Failed to load DNBD3 kernel module..."
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+if ! insmod "${NBD_MOD_PATH}"; then
+	warn "Failed to load NBD kernel module..."
+	emergency_shell -n "Error in $0"
+	return 1
+fi
+
+return 0
-- 
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