[archiso] Rework Makefile / Reorder files

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

1 files changed, 198 insertions, 0 deletions

diff --git a/hooks/archiso b/hooks/archiso
new file mode 100644
index 0000000..9445498
--- /dev/null
+++ b/hooks/archiso
@@ -0,0 +1,198 @@
+# args: source, newroot, mountpoint
+_mnt_fs() {
+    local img="${1}"
+    local newroot="${2}"
+    local mnt="${3}"
+    local img_fullname="${img##*/}";
+    local img_name="${img_fullname%%.*}"
+    local dm_snap_name="${dm_snap_prefix}_${img_name}"
+    local ro_dev ro_dev_size rw_dev
+
+    ro_dev=$(losetup --find --show --read-only "${img}")
+    echo ${ro_dev} >> /run/archiso/used_block_devices
+    ro_dev_size=$(blockdev --getsz ${ro_dev})
+
+    if [[ "${cow_persistent}" == "P" ]]; then
+        if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
+            msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow', using as persistent."
+        else
+            msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as persistent."
+            dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
+        fi
+    else
+        if [[ -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow" ]]; then
+            msg ":: Found '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' but non-persistent requested, removing."
+            rm -f "/run/archiso/cowspace/${cow_directory}/${img_name}.cow"
+        fi
+        msg ":: Creating '/run/archiso/cowspace/${cow_directory}/${img_name}.cow' as non-persistent."
+        dd of="/run/archiso/cowspace/${cow_directory}/${img_name}.cow" count=0 seek=${ro_dev_size} &> /dev/null
+    fi
+
+    rw_dev=$(losetup --find --show "/run/archiso/cowspace/${cow_directory}/${img_name}.cow")
+    echo ${rw_dev} >> /run/archiso/used_block_devices
+
+    echo "0 ${ro_dev_size} snapshot ${ro_dev} ${rw_dev} ${cow_persistent} 8" | dmsetup create ${dm_snap_name}
+
+    _mnt_dev "/dev/mapper/${dm_snap_name}" "${newroot}${mnt}" "-w"
+    echo $(readlink -f /dev/mapper/${dm_snap_name}) >> /run/archiso/used_block_devices
+    echo "/dev/mapper/${dm_snap_name} ${mnt} auto defaults 0 0" >> ${newroot}/etc/fstab
+}
+
+# args: /path/to/image_file, mountpoint
+_mnt_sfs() {
+    local img="${1}"
+    local mnt="${2}"
+    local img_fullname="${img##*/}"
+    local sfs_dev
+
+    if [[ "${copytoram}" == "y" ]]; then
+        msg -n ":: Copying squashfs image to RAM..."
+        if ! cp "${img}" "/run/archiso/copytoram/${img_fullname}" ; then
+            echo "ERROR: while copy '${img}' to '/run/archiso/copytoram/${img_fullname}'"
+            launch_interactive_shell
+        fi
+        img="/run/archiso/copytoram/${img_fullname}"
+        msg "done."
+    fi
+    sfs_dev=$(losetup --find --show --read-only "${img}")
+    echo ${sfs_dev} >> /run/archiso/used_block_devices
+    _mnt_dev "${sfs_dev}" "${mnt}" "-r"
+}
+
+# args: device, mountpoint, flags
+_mnt_dev() {
+    local dev="${1}"
+    local mnt="${2}"
+    local flg="${3}"
+
+    mkdir -p "${mnt}"
+
+    msg ":: Mounting '${dev}' to '${mnt}'"
+
+    while ! poll_device "${dev}" 30; do
+        echo "ERROR: '${dev}' device did not show up after 30 seconds..."
+        echo "   Falling back to interactive prompt"
+        echo "   You can try to fix the problem manually, log out when you are finished"
+        launch_interactive_shell
+    done
+
+    if mount "${flg}" "${dev}" "${mnt}"; then
+        msg ":: Device '${dev}' mounted successfully."
+    else
+        echo "ERROR; Failed to mount '${dev}'"
+        echo "   Falling back to interactive prompt"
+        echo "   You can try to fix the problem manually, log out when you are finished"
+        launch_interactive_shell
+    fi
+}
+
+_verify_checksum() {
+    local _status
+    cd "/run/archiso/bootmnt/${archisobasedir}"
+    md5sum -c checksum.${arch}.md5 > /tmp/checksum.${arch}.log 2>&1
+    _status=$?
+    cd "${OLDPWD}"
+    return ${_status}
+}
+
+run_hook() {
+    [[ -z "${arch}" ]] && arch="$(uname -m)"
+    [[ -z "${cowspace_size}" ]] && cowspace_size="75%"
+    [[ -z "${copytoram_size}" ]] && copytoram_size="75%"
+    [[ -z "${archisobasedir}" ]] && archisobasedir="arch"
+    [[ -z "${dm_snap_prefix}" ]] && dm_snap_prefix="arch"
+    [[ -z "${archisodevice}" ]] && archisodevice="/dev/disk/by-label/${archisolabel}"
+
+    if [[ -z "${aitab}" ]]; then
+        aitab="/run/archiso/bootmnt/${archisobasedir}/aitab"
+    else
+        aitab="/run/archiso/bootmnt/${archisobasedir}/${aitab}"
+    fi
+
+    if [[ -n "${cow_label}" ]]; then
+        cow_device="/dev/disk/by-label/${cow_label}"
+        [[ -z "${cow_persistent}" ]] && cow_persistent="P"
+    elif [[ -n "${cow_device}" ]]; then
+        [[ -z "${cow_persistent}" ]] && cow_persistent="P"
+    else
+        cow_persistent="N"
+    fi
+
+    [[ -z "${cow_directory}" ]] && cow_directory="persistent_${archisolabel}/${arch}"
+
+    # set mount handler for archiso
+    mount_handler="archiso_mount_handler"
+}
+
+# This function is called normally from init script, but it can be called
+# as chain from other mount handlers.
+# args: /path/to/newroot
+archiso_mount_handler() {
+    local newroot="${1}"
+
+    if ! mountpoint -q "/run/archiso/bootmnt"; then
+        _mnt_dev "${archisodevice}" "/run/archiso/bootmnt" "-r"
+        if [[ "${copytoram}" != "y" ]]; then
+            echo $(readlink -f ${archisodevice}) >> /run/archiso/used_block_devices
+        fi
+    fi
+
+
+    if [[ ! -f "${aitab}" ]]; then
+        echo "ERROR: '${aitab}' file does not exist."
+        echo "   Falling back to interactive prompt"
+        echo "   You can try to fix the problem manually, log out when you are finished"
+        launch_interactive_shell
+    fi
+
+    if [[ "${checksum}" == "y" ]]; then
+        if [[ -f "/run/archiso/bootmnt/${archisobasedir}/checksum.${arch}.md5" ]]; then
+            msg -n ":: Self-test requested, please wait..."
+            if _verify_checksum; then
+                msg "done. Checksum is OK, continue booting."
+            else
+                echo "ERROR: one or more files are corrupted"
+                echo "see /tmp/checksum.${arch}.log for details"
+                launch_interactive_shell
+            fi
+        else
+            echo "ERROR: checksum=y option specified but checksum.${arch}.md5 not found"
+            launch_interactive_shell
+        fi
+    fi
+
+    if [[ "${copytoram}" == "y" ]]; then
+        msg ":: Mounting /run/archiso/copytoram (tmpfs) filesystem, size=${copytoram_size}"
+        mkdir -p /run/archiso/copytoram
+        mount -t tmpfs -o "size=${copytoram_size}",mode=0755 copytoram /run/archiso/copytoram
+    fi
+
+    if [[ -n "${cow_device}" ]]; then
+        _mnt_dev "${cow_device}" "/run/archiso/cowspace" "-r"
+        echo $(readlink -f ${cow_device}) >> /run/archiso/used_block_devices
+        mount -o remount,rw "/run/archiso/cowspace"
+    else
+        msg ":: Mounting /run/archiso/cowspace (tmpfs) filesystem, size=${cowspace_size}..."
+        mkdir -p /run/archiso/cowspace
+        mount -t tmpfs -o "size=${cowspace_size}",mode=0755 cowspace /run/archiso/cowspace
+    fi
+    mkdir -p "/run/archiso/cowspace/${cow_directory}"
+
+    local aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size
+    while read aitab_img aitab_mnt aitab_arch aitab_sfs_comp aitab_fs_type aitab_fs_size; do
+        [[ "${aitab_img#\#}" != "${aitab_img}" ]] && continue
+        [[ "${aitab_arch}" != "any" && "${aitab_arch}" != "${arch}" ]] && continue
+        if [[ "${aitab_fs_type}" != "none" ]]; then
+            _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.fs.sfs" "/run/archiso/sfs/${aitab_img}"
+            _mnt_fs "/run/archiso/sfs/${aitab_img}/${aitab_img}.fs" "${newroot}" "${aitab_mnt}"
+        else
+            _mnt_sfs "/run/archiso/bootmnt/${archisobasedir}/${aitab_arch}/${aitab_img}.sfs" "${newroot}${aitab_mnt}"
+        fi
+    done < "${aitab}"
+
+    if [[ "${copytoram}" == "y" ]]; then
+        umount /run/archiso/bootmnt
+    fi
+}
+
+# vim:ft=sh:ts=4:sw=4:et: