On 12/07/2010 01:43 AM, Baurzhan Muftakhidinov wrote:
2010/12/1 Gerardo Exequiel Pozzi<[email protected]>:
Add two parameters:
img_dev=/dev/sdNM
where /dev/sdNM is the device where .iso is located.
img_loop=/path/to/arch.iso
where /path/to/arch.iso is the full path of the .iso in the device img_dev.
Original idea from Baurzhan Muftakhidinov.
Signed-off-by: Gerardo Exequiel Pozzi<[email protected]>
---
archiso/Makefile | 2 ++
archiso/hooks/archiso_loop_mnt | 33 +++++++++++++++++++++++++++++++++
archiso/install/archiso_loop_mnt | 18 ++++++++++++++++++
configs/syslinux-iso/mkinitcpio.conf | 2 +-
4 files changed, 54 insertions(+), 1 deletions(-)
create mode 100644 archiso/hooks/archiso_loop_mnt
create mode 100644 archiso/install/archiso_loop_mnt
diff --git a/archiso/Makefile b/archiso/Makefile
index 688eb1b..93d68af 100644
--- a/archiso/Makefile
+++ b/archiso/Makefile
@@ -10,6 +10,8 @@ install: all
install -D -m 644 install/archiso
$(DESTDIR)/lib/initcpio/install/archiso
install -D -m 644 hooks/archiso_pxe_nbd
$(DESTDIR)/lib/initcpio/hooks/archiso_pxe_nbd
install -D -m 644 install/archiso_pxe_nbd
$(DESTDIR)/lib/initcpio/install/archiso_pxe_nbd
+ install -D -m 644 hooks/archiso_loop_mnt
$(DESTDIR)/lib/initcpio/hooks/archiso_loop_mnt
+ install -D -m 644 install/archiso_loop_mnt
$(DESTDIR)/lib/initcpio/install/archiso_loop_mnt
# install docs and examples
install -d -m 755 $(DESTDIR)/usr/share/archiso/
cp -r ../configs $(DESTDIR)/usr/share/archiso/configs
diff --git a/archiso/hooks/archiso_loop_mnt b/archiso/hooks/archiso_loop_mnt
new file mode 100644
index 0000000..0d5eba7
--- /dev/null
+++ b/archiso/hooks/archiso_loop_mnt
@@ -0,0 +1,33 @@
+# vim: set ft=sh:
+
+run_hook () {
+ if [ -n "${img_dev}" ]&& [ -n "${img_loop}" ]; then
+ mount_handler="archiso_loop_mount_handler"
+ fi
+}
+
+archiso_loop_mount_handler () {
+ newroot="${1}"
+
+ while [ ! -b "${img_dev}" ]; do
+ sleep 1
+ done
+
+ msg "::: Setup a loop device from ${img_loop} located at device ${img_dev}"
+ FSTYPE=$(blkid -o value -s TYPE -p ${img_dev} 2> /dev/null)
+ if [ -n "${FSTYPE}" ]; then
+ if mount -r -t "${FSTYPE}" ${img_dev} /img_dev> /dev/null 2>&1; then
+ _dev_loop=$(losetup -f)
+ losetup ${_dev_loop} /img_dev/${img_loop}
+ fi
+ fi
+
+ archiso_mount_handler ${newroot}
+
+ if [ "${copytoram}" = "y" ]; then
+ msg "::: Deataching loop device ${_dev_loop}"
+ losetup -d ${_dev_loop}
+ msg "::: Unmounting ${img_dev}"
+ umount ${img_dev}
+ fi
+}
diff --git a/archiso/install/archiso_loop_mnt b/archiso/install/archiso_loop_mnt
new file mode 100644
index 0000000..c0d21a6
--- /dev/null
+++ b/archiso/install/archiso_loop_mnt
@@ -0,0 +1,18 @@
+# vim: set ft=sh:
+
+install ()
+{
+ MODULES=""
+
+ BINARIES=""
+ FILES=""
+ add_dir /img_dev
+ SCRIPT="archiso_loop_mnt"
+}
+
+help ()
+{
+cat<<HELPEOF
+ This hook loads the necessary modules for boot via loop device.
+HELPEOF
+}
diff --git a/configs/syslinux-iso/mkinitcpio.conf
b/configs/syslinux-iso/mkinitcpio.conf
index 15097c0..f5f8c79 100644
--- a/configs/syslinux-iso/mkinitcpio.conf
+++ b/configs/syslinux-iso/mkinitcpio.conf
@@ -2,5 +2,5 @@
MODULES=""
BINARIES=""
FILES=""
-HOOKS="base udev memdisk archiso archiso_pxe_nbd pata scsi sata usb fw pcmcia
filesystems usbinput"
+HOOKS="base udev memdisk archiso archiso_pxe_nbd archiso_loop_mnt pata scsi sata
usb fw pcmcia filesystems usbinput"
COMPRESSION="lzma"
--
1.7.3.2
Hi
This method does not work for me. I used Qemu to test it.
The boot process hangs at
'Waiting 30 seconds for device /dev/disk/by-name/' Thats it.
Which device should poll the archiso_mount_handler function? Is it USB
media, or ISO image?
Normal boot process as 'qemu -cdrom arch.iso' works fine.
how you started qemu?
should be something like:
qemu-kvm -m 512 -kernel vmlinuz26 -initrd archiso.img -append
"archisolabel=ARCH_201012 img_dev=/dev/sda1 img_loop=/arch.iso" -hda
arch.img
where arch.img has one or more partitions with supported filesystem, and
inside there is an "arch.iso" file.
--
Gerardo Exequiel Pozzi
\cos^2\alpha + \sin^2\alpha = 1
