main/syslinux: dynamically generate /boot/extlinux.conf using a trigger on /boot

1 files changed, 85 insertions, 0 deletions

diff --git a/main/syslinux/update-extlinux b/main/syslinux/update-extlinux
new file mode 100755
index 0000000000..831eaa05bd
--- /dev/null
+++ b/main/syslinux/update-extlinux
@@ -0,0 +1,85 @@
+#!/bin/sh
+
+default=0
+timeout=5
+verbose=0
+
+# read in extlinux settings
+source /etc/extlinux.conf
+
+everbose() {
+	if [ "$verbose" = "0" ]; then
+		return
+	fi
+
+	echo $*
+}
+
+everbose "Updating extlinux configuration."
+
+if [ "x$root" = "x" ]; then
+	everbose "WARNING: Root device not specified, determining automatically."
+	everbose -n "Root device is: "
+	export `blkid -o export /dev/root`
+	root=UUID=$UUID
+	everbose $root
+fi
+
+everbose "Installing mboot.c32 to /boot."
+cp /usr/share/syslinux/mboot.c32 /boot
+
+everbose "Installing menu.c32 to /boot."
+cp /usr/share/syslinux/menu.c32 /boot
+
+rtimeout=$((${timeout}\*10))
+# vesa menu has been requested?
+if [ "$fancy_menu" = "1" ]; then
+	everbose "Installing vesamenu.c32 to /boot."
+	cp /usr/share/syslinux/vesamenu.c32 /boot
+
+	echo "DEFAULT vesamenu.c32" > /boot/extlinux.conf.new
+	echo "PROMPT 0" >> /boot/extlinux.conf.new
+	echo "MENU TITLE Alpine/$(uname -s) Boot Menu" >> /boot/extlinux.conf
+	echo "MENU HIDDEN" >> /boot/extlinux.conf.new
+	echo "MENU AUTOBOOT Alpine will be booted automatically in # seconds." >> /boot/extlinux.conf.new
+	echo "TIMEOUT $rtimeout" >> /boot/extlinux.conf.new
+else
+	echo "DEFAULT menu.c32" > /boot/extlinux.conf.new
+	echo "PROMPT 0" >> /boot/extlinux.conf.new
+	echo "MENU TITLE Alpine/$(uname -s) Boot Menu" >> /boot/extlinux.conf
+	echo "MENU HIDDEN" >> /boot/extlinux.conf.new
+	echo "MENU AUTOBOOT Alpine will be booted automatically in # seconds." >> /boot/extlinux.conf.new
+	echo "TIMEOUT $rtimeout" >> /boot/extlinux.conf.new
+fi
+
+lst=0
+for kernel in $(find /boot -name vmlinuz-* -type f); do
+	tag=$(basename $kernel | cut -b9-)
+	everbose "Found kernel: $kernel"
+
+	if [ -f "/boot/initramfs-$tag" ]; then
+		everbose "Found initramfs: /boot/initramfs-$tag"
+		initramfs="initrd=initramfs-$tag"
+	fi
+
+	echo "LABEL $lst" >> /boot/extlinux.conf.new
+	if [ "$lst" = "$default" ]; then
+		echo "  MENU DEFAULT" >> /boot/extlinux.conf.new
+	fi
+	echo "  MENU LABEL Linux $tag" >> /boot/extlinux.conf.new
+	echo "  KERNEL $(basename $kernel)" >> /boot/extlinux.conf.new
+	echo "  APPEND $initramfs root=$root modules=$modules $default_kernel_opts" >> /boot/extlinux.conf.new
+	lst=$(($lst + 1))
+done
+
+if [ -f "/boot/memtest.bin" ]; then
+	everbose "Found memtest86+: /boot/memtest.bin"
+	echo "LABEL $lst" >> /boot/extlinux.conf.new
+	echo "  MENU LABEL Memtest86+" >> /boot/extlinux.conf.new
+        echo "  KERNEL memtest.bin" >> /boot/extlinux.conf.new
+        lst=$(($lst + 1))
+fi
+
+everbose "$lst entries found."
+
+mv /boot/extlinux.conf.new /boot/extlinux.conf