Refactoring.

2 files changed, 118 insertions, 0 deletions

diff --git a/dev-tools/snippets.sh b/dev-tools/snippets.sh
new file mode 100644
index 00000000..6f4f21cc
--- /dev/null
+++ b/dev-tools/snippets.sh
@@ -0,0 +1,113 @@
+su nobody -s /bin/bash
+yaourt -S multipath-tools
+exit
+
+# close running connection
+./dnbd3-client -d /dev/dnbd0 -c
+
+# 1. connect to dnbd3 server
+cd dnbd3/build
+insmod dnbd3.ko
+./dnbd3-client -h gateway -i archLinux.qcow2 -d /dev/dnbd0
+
+# 2. make available partition in qemu container
+modprobe nbd
+qemu-nbd --connect=/dev/nbd0 /dev/dnbd0 --read-only
+
+# 2. make available partition in qemu container (writable)
+# qemu-nbd --connect=/dev/nbd0 /dev/dnbd0 --snapshot
+# todo where is the cow device?
+# todo why does --partition not work?
+# todo use qemu-img instead?
+
+# 3. mount container partition
+modprobe dm_multipath
+kpartx -av /dev/nbd0 # or use fdisk -l and mount offset
+mount /dev/mapper/nbd0p2 /mnt/
+
+# 5. cleanup
+umount /mnt/
+kpartx -d /dev/nbd0
+qemu-nbd --disconnect /dev/nbd0
+
+
+# mount container partition directly
+# yaourt -S libguestfs
+guestmount -a /dev/dnbd0 -m /dev/sda2 --ro /mnt -v
+
+
+# make read-only partition writable
+mknod -m 660 /dev/ram0 b 1 1
+chown root.disk /dev/ram0
+DEV=/dev/mapper/nbd0p2
+SIZE=`blockdev --getsz $DEV`
+dmsetup create sandbox --table "0 $SIZE snapshot $DEV /dev/ram0 N 1"
+mount /dev/mapper/sandbox /mnt
+umount /mnt
+dmsetup remove sandbox
+
+modprobe loop
+dd if=/dev/zero of=persistent_storage.img bs=1k count=1000
+losetup /dev/loop0 persistent_storage.img
+
+# Mount second partion example.
+fdisk -lu
+losetup -o $((1050624*512)) /dev/loop0 /dev/nbd0 -v
+mount /dev/loop0 /mnt/
+
+function create_partition_via_offset() {
+    local device="$1"
+    local nameOrUUID="$2"
+    local loopDevice=$(losetup -f)
+
+    #local sector_size=$(fdisk -l -u $device | grep "Sector size" | cut -d' ' -f4)
+    local sectorSize=$(blockdev --getbsz $device)
+    echo sector size: $sectorSize
+    local partitionInfo=$(partx --raw --noheadings --output START,NAME,UUID /dev/nbd0 2>/dev/null| grep $nameOrUUID)
+    local offsetSectors=$(echo $partitionInfo | cut -d' ' -f1)
+    if [ -z "$offsetSectors" ]; then
+        build_initramfs_log 'error' \
+            "could not find partition with label/uuid '$nameOrUUID' on device $device"
+        return 1
+    fi
+    #echo $(($offsetSectors*512)) # could overflow on 32bit systems
+    offsetBytes=$(echo $| awk -v x=$offsetSectors -v y=$sectorSize '{print x * y}')
+    echo $offsetBytes
+
+    # test if mount works directly (problem with btrfs device id)
+    #mount -v -o loop,offset=$offsetBytes $device $mountPoint
+    losetup -v -o $offsetBytes $loopDevice $device
+    echo $loopDevice
+}
+function make_partition_writable() {
+    local deviceName="$1"
+    local partition="$2"
+    local writable_device="$3"
+
+    local size=$(blockdev --getsz $partition)
+    dmsetup create "$deviceName" --table \
+        "0 $size snapshot $partition $writable_device N 1"
+    mount /dev/mapper/sandbox /mnt
+}
+function make_ram_device() {
+    mknod -m 660 /dev/ram0 b 1 1
+    chown root.disk /dev/ram0
+    echo /dev/ram0
+}
+function make_device_from_file() {
+    local file="$1"
+    local sizeInMegaByte="$2"
+    #modprobe loop
+    local loopDevice=$(losetup -f)
+    dd if=/dev/zero of="$file" bs=1M count=$sizeInMegaByte
+    losetup "$loopDevice" "$file"
+    mkfs.ext4 "$loopDevice"
+    echo $loopDevice
+}
+
+local partition=$(create_partition_via_offset "/dev/nbd0" "system")
+
+local writableDevice=$(make_device_from_file "persistent_storage.img" "50")
+local writableDevice=$(make_ram_device)
+make_partition_writable "sandbox" "$partition" "$writableDevice"
+mount /dev/mapper/sandbox $mountPoint
diff --git a/dev-tools/startup.nsh b/dev-tools/startup.nsh
new file mode 100755
index 00000000..197beb46
--- /dev/null
+++ b/dev-tools/startup.nsh
@@ -0,0 +1,5 @@
+if exist fs0:\debug then
+    rm fs0:\debug
+    \vmlinuz-linux initrd=\initramfs-4.2.2-1-ARCH.img root=PARTLABEL=system rw rootflags=subvol=root quiet loglevel=2 acpi_osi="!Windows 2012"
+endif
+\vmlinuz-linux initrd=\initramfs-linux.img root=PARTLABEL=system rw rootflags=subvol=root quiet loglevel=2 acpi_osi="!Windows 2012"