[archiso] Add -D <install_dir> option to mkarchiso

-D <install_dir> allow to select install directory on target media
                  defaults to "arch".

There is a new %INSTALL_DIR% macro for syslinux.cfg.

This is how ISO will look now:
/syslinux    only syslinux related files (syslinux.cfg, *.c32, etc)
/arch/       isomounts + *.sqfs images
/arch/boot/  Linux + initramfs + Memtest86+ + other files for early boot stage

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

1 files changed, 4 insertions, 0 deletions

diff --git a/archiso/hooks/archiso b/archiso/hooks/archiso
index 92a5430..4a4239e 100644
--- a/archiso/hooks/archiso
+++ b/archiso/hooks/archiso
@@ -62,6 +62,10 @@ run_hook() {
         copytoram_size="75%"
     fi
 
+    if [ "x${archisobasedir}" = "x" ]; then
+        archisobasedir="arch"
+    fi
+
     if [ "x${isomounts}" != "x" ]; then
         isomounts="/bootmnt/${isomounts}"
     else