Cleanup archiso hook

Fix squashfs mounting of all isomounts images, along
with a few other changes

Signed-off-by: Aaron Griffin <aaronmgriffin@gmail.com>

archiso/hooks/archiso

@@ -6,17 +6,27 @@ _mnt_bind()
     /bin/mount -o bind ${1} /real_root${2}
 }
 
-# args: image file
+# args: /path/to/image_file
 _mnt_squashfs()
 {
-    msg "::: Adding new union branch: ${1}"
     /bin/modprobe -q loop >/dev/null 2>&1
+    
+    img="${1}"
+    base_img="${img##*/}";
+
+    if [ "${copytoram}" = "y" ]; then
+        msg ":: Copying squashfs image to RAM"
+        /bin/cat ${img} > "/tmpfs/${base_img}"
+        img="/tmpfs/${base_img}"
+    fi
+
+    msg "::: Adding new union branch: ${base_img%.*}"
     mkdir -p "/tmpfs/mnt/loop${LOOP_NUM}"
     # sometimes it takes udev a while to create device nodes
-    until [ -e "/dev/loop${LOOP_NUM}" ]; do
+    while [ ! -e "/dev/loop${LOOP_NUM}" ]; do
         sleep 1
     done
-    if ! /bin/losetup "/dev/loop${LOOP_NUM}" ${1}; then
+    if ! /bin/losetup "/dev/loop${LOOP_NUM}" ${img}; then
         echo "ERROR: Cannot mount loop device /dev/loop${LOOP_NUM}"
         break
     fi
@@ -46,14 +56,13 @@ run_hook ()
     msg ":: Scanning for boot device..."
 
     /bin/mkdir -p /bootmnt
-    bootmnt="/bootmnt"
     found=0
 
     /bin/modprobe -q isofs >/dev/null 2>&1
     msg ":: Scanning cd drives..."
     for cdrom in /dev/hd[a-z] /dev/sr[0-9]* /dev/scd[a-z] /dev/sg[0-9]*; do
-        if mount -r -t iso9660 "${cdrom}" ${bootmnt} >/dev/null 2>&1; then
+        if mount -r -t iso9660 "${cdrom}" /bootmnt >/dev/null 2>&1; then
-            if [ -e "${bootmnt}/isomounts" ]; then
+            if [ -e "/bootmnt/isomounts" ]; then
                 found=1
                 msg "${cdrom}"
                 break
@@ -61,15 +70,15 @@ run_hook ()
         else
             echo "Failed to mount ${cdrom}"
         fi
-        [ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
+        [ ${found} -eq 0 ] && umount /bootmnt >/dev/null 2>&1
     done
 
     if [ ${found} -eq 0 ]; then
         msg ":: Scanning usb drives..."
         for usb in /dev/sd[a-z][0-9]; do
-            if mount -r -t vfat "${usb}" ${bootmnt} >/dev/null 2>&1 ||\
+            if mount -r -t vfat "${usb}" /bootmnt >/dev/null 2>&1 ||\
-                mount -r -t ext2 "${usb}" ${bootmnt} >/dev/null 2>&1; then
+                mount -r -t ext2 "${usb}" /bootmnt >/dev/null 2>&1; then
-                if [ -e "${bootmnt}/isomounts" ]; then
+                if [ -e "/bootmnt/isomounts" ]; then
                     found=1
                     msg "${usb}"
                     break
@@ -77,7 +86,7 @@ run_hook ()
             else
                 echo "Failed to mount ${usb}"
             fi
-            [ ${found} -eq 0 ] && umount ${bootmnt} >/dev/null 2>&1
+            [ ${found} -eq 0 ] && umount /bootmnt >/dev/null 2>&1
         done
     fi
 
@@ -88,21 +97,13 @@ run_hook ()
         exit 1
     fi
 
-    base_img="${bootmnt}/root-image.sqfs"
-    if [ "${copytoram}" = "y" ]; then
-        msg ":: Copying squashfs image to RAM"
-        /bin/cat ${base_img} > /tmpfs/root-image.sqfs
-        base_img="/tmpfs/root-image.sqfs"
-    fi
-
     /bin/modprobe -q squashfs >/dev/null 2>&1
+    /bin/modprobe -q unionfs >/dev/null 2>&1
 
     msg ":: Mounting root (union) filesystem"
-    /bin/modprobe -q unionfs >/dev/null 2>&1
     /bin/mount -t unionfs -o dirs=/tmpfs=rw none /real_root
 
     export LOOP_NUM="0"
-    if [ -e "/isomounts" ]; then
     msg ":: Mounting images"
     while read img imgarch mountpoint type; do
         # check if this line is a comment (starts with #)
@@ -110,18 +111,17 @@ run_hook ()
 
         [ "$imgarch" != "$arch" ] && continue
 
-            if [ "${type}" = "bind" ]; then
+        [ ! -f "/bootmnt/${img}" ] && continue
-                _mnt_bind ${img} ${mountpoint}
-            elif [ "${type}" = "squashfs" ]; then
-                _mnt_squashfs "${img}"
-            fi
-        done < /isomounts
-    else
-        msg ":: No mountable images found"
-    fi
 
-    # layer the "pristine" base system image last
+        if [ "${type}" = "bind" ]; then
-    _mnt_squashfs ${base_img}
+            _mnt_bind "/bootmnt/${img}" ${mountpoint}
+        elif [ "${type}" = "squashfs" ]; then
+            _mnt_squashfs "/bootmnt/${img}"
+        fi
+    done < "/bootmnt/isomounts"
+
+    # Bind our bootmnt dir into the live system
+    _mnt_bind /bootmnt bootmnt
 
     if [ -d /proc/sys/dev/cdrom ]; then
         echo 0 > /proc/sys/dev/cdrom/lock