[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>

6 files changed, 120 insertions, 0 deletions

diff --git a/configs/baseline/aitab b/configs/baseline/aitab
new file mode 100644
index 0000000..fbd4d00
--- /dev/null
+++ b/configs/baseline/aitab
@@ -0,0 +1,2 @@
+# <img>         <mnt>                 <arch>   <sfs_comp>  <fs_type>  <fs_size>
+root-image      /                     %ARCH%   xz          ext4       50%
diff --git a/configs/baseline/build.sh b/configs/baseline/build.sh
new file mode 100755
index 0000000..3c896e8
--- /dev/null
+++ b/configs/baseline/build.sh
@@ -0,0 +1,97 @@
+#!/bin/bash
+
+set -e -u
+
+name=archlinux
+iso_label="ARCH_$(date +%Y%m)"
+version=$(date +%Y.%m.%d)
+install_dir=arch
+arch=$(uname -m)
+work_dir=work
+verbose="n"
+
+# This function can be called after make_basefs()
+get_linux_ver() {
+    local ALL_kver
+    eval $(grep ^ALL_kver ${work_dir}/root-image/etc/mkinitcpio.d/kernel26.kver)
+    echo ${ALL_kver}
+}
+
+# Base installation (root-image)
+make_basefs() {
+    mkarchiso ${verbose} -D "${install_dir}" -p "base" create "${work_dir}"
+    mkarchiso ${verbose} -D "${install_dir}" -p "syslinux" create "${work_dir}"
+}
+
+# Customize installation (root-image)
+make_customize_root_image() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        cp -af root-image ${work_dir}
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
+# Prepare ${install_dir}/boot/
+make_boot() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        mkdir -p ${work_dir}/iso/${install_dir}/boot/${arch}
+        cp ${work_dir}/root-image/boot/vmlinuz26 ${work_dir}/iso/${install_dir}/boot/${arch}
+        mkinitcpio -c ./mkinitcpio.conf -b ${work_dir}/root-image -k $(get_linux_ver) -g ${work_dir}/iso/${install_dir}/boot/${arch}/archiso.img
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
+# Prepare /${install_dir}/boot/syslinux
+make_syslinux() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        mkdir -p ${work_dir}/iso/${install_dir}/boot/syslinux
+        sed "s|%ARCHISO_LABEL%|${iso_label}|g;
+            s|%INSTALL_DIR%|${install_dir}|g;
+            s|%ARCH%|${arch}|g" syslinux/syslinux.cfg > ${work_dir}/iso/${install_dir}/boot/syslinux/syslinux.cfg
+        cp ${work_dir}/root-image/usr/lib/syslinux/menu.c32 ${work_dir}/iso/${install_dir}/boot/syslinux/
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
+# Prepare /isolinux
+make_isolinux() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        mkdir -p ${work_dir}/iso/isolinux
+        sed "s|%INSTALL_DIR%|${install_dir}|g" isolinux/isolinux.cfg > ${work_dir}/iso/isolinux/isolinux.cfg
+        cp ${work_dir}/root-image/usr/lib/syslinux/isolinux.bin ${work_dir}/iso/isolinux/
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
+# Process aitab
+make_aitab() {
+    if [[ ! -e ${work_dir}/build.${FUNCNAME} ]]; then
+        sed "s|%ARCH%|${arch}|g" aitab > ${work_dir}/iso/${install_dir}/aitab
+        : > ${work_dir}/build.${FUNCNAME}
+    fi
+}
+
+# Build all filesystem images specified in aitab (.fs .fs.sfs .sfs)
+make_prepare() {
+    mkarchiso ${verbose} -D "${install_dir}" prepare "${work_dir}"
+}
+
+# Build ISO
+make_iso() {
+    mkarchiso ${verbose} -D "${install_dir}" -L "${iso_label}" iso "${work_dir}" "${name}-${version}-${arch}.iso"
+}
+
+if [[ $verbose == "y" ]]; then
+    verbose="-v"
+else
+    verbose=""
+fi
+
+make_basefs
+make_customize_root_image
+make_boot
+make_syslinux
+make_isolinux
+make_aitab
+make_prepare
+make_iso
diff --git a/configs/baseline/isolinux/isolinux.cfg b/configs/baseline/isolinux/isolinux.cfg
new file mode 100644
index 0000000..e7bbaa4
--- /dev/null
+++ b/configs/baseline/isolinux/isolinux.cfg
@@ -0,0 +1,5 @@
+DEFAULT loadconfig
+
+LABEL loadconfig
+  CONFIG /%INSTALL_DIR%/boot/syslinux/syslinux.cfg
+  APPEND /%INSTALL_DIR%/boot/syslinux/
diff --git a/configs/baseline/mkinitcpio.conf b/configs/baseline/mkinitcpio.conf
new file mode 100644
index 0000000..389ec51
--- /dev/null
+++ b/configs/baseline/mkinitcpio.conf
@@ -0,0 +1,2 @@
+HOOKS="base udev archiso sata filesystems"
+COMPRESSION="xz"
diff --git a/configs/baseline/root-image/etc/fstab b/configs/baseline/root-image/etc/fstab
new file mode 100644
index 0000000..4b82b80
--- /dev/null
+++ b/configs/baseline/root-image/etc/fstab
@@ -0,0 +1,2 @@
+# <file system>        <dir>         <type>    <options>          <dump> <pass>
+/dev/mapper/root-image /             auto      defaults           0      0
diff --git a/configs/baseline/syslinux/syslinux.cfg b/configs/baseline/syslinux/syslinux.cfg
new file mode 100644
index 0000000..f755453
--- /dev/null
+++ b/configs/baseline/syslinux/syslinux.cfg
@@ -0,0 +1,12 @@
+DEFAULT menu.c32
+PROMPT 0
+MENU TITLE Arch Linux
+TIMEOUT 300
+
+LABEL arch
+MENU LABEL Arch Linux
+LINUX /%INSTALL_DIR%/boot/%ARCH%/vmlinuz26
+INITRD /%INSTALL_DIR%/boot/%ARCH%/archiso.img
+APPEND archisobasedir=%INSTALL_DIR% archisolabel=%ARCHISO_LABEL%
+
+ONTIMEOUT arch