[archiso] Use dm-snapshot instead of aufs2 (A.K.A. "The Big Commit")

* Use device mapper + snapshot module, instead union layer filesystem.
  * A block-level approach vs vfs-level.
  * No more unofficial (Linux) things.
  * More memory is needed.
* Refactor mkarchiso.
* Refactor hooks/archiso.
* Fix install/archiso_pxe_nbd
  (due recent change in mkinitcpio-0.6.15 on checked_modules()/all_modules())
  [Thanks Dave for the improved workaround]
* New configs/releng to build official images.
  * Works with a Bash script instead of Makefile.
    (better control and easy to maintain)
* Remove configs/syslinux-iso.
* Remove archiso2dual script. Integrate functionality in configs/releng.
* New configs/baseline to build the most basic live medium or use as template.
* New README (draft). [Thanks Dieter for fixing english grammar]

Signed-off-by: Gerardo Exequiel Pozzi <vmlinuz386@yahoo.com.ar>

1 files changed, 20 insertions, 0 deletions

diff --git a/configs/releng/root-image/etc/archiso/functions b/configs/releng/root-image/etc/archiso/functions
new file mode 100644
index 0000000..9fffdcb
--- /dev/null
+++ b/configs/releng/root-image/etc/archiso/functions
@@ -0,0 +1,20 @@
+# vim: set ft=sh:
+
+# kernel_cmdline <param> <default>
+# Looks for a parameter on the kernel's boot-time command line.
+#
+# returns: 0 if param was found. Also prints its value if it was a K=V param.
+#          1 if it was not. Also prints value passed as <default>
+#
+kernel_cmdline ()
+{
+    for param in $(/bin/cat /proc/cmdline); do
+        case "${param}" in
+            $1=*) echo "${param##*=}"; return 0 ;;
+            $1) return 0 ;;
+            *) continue ;;
+        esac
+    done
+    [ -n "${2}" ] && echo "${2}"
+    return 1
+}