main/compat-pvgrub: new aport

This builds a grub configuration automatically, similar to update-extlinux (derived from that code).
It assumes a typical Xen deployment, with the filesystem being flat, and on (hd0).

fix #2356

3 files changed, 153 insertions, 0 deletions

diff --git a/main/compat-pvgrub/APKBUILD b/main/compat-pvgrub/APKBUILD
new file mode 100644
index 000000000..61e3741e1
--- /dev/null
+++ b/main/compat-pvgrub/APKBUILD
@@ -0,0 +1,33 @@
+# Contributor: William Pitcock <nenolod@dereferenced.org>
+# Maintainer: William Pitcock <nenolod@dereferenced.org>
+pkgname=compat-pvgrub
+pkgver=1
+pkgrel=0
+pkgdesc="compatibility support for PV-GRUB 1.x"
+url="http://www.alpinelinux.org/"
+arch="noarch"
+license="ISC"
+depends=""
+depends_dev=""
+makedepends="$depends_dev"
+triggers="compat-pvgrub.trigger=/boot"
+install=""
+subpackages=""
+source="update-pvgrub"
+
+_builddir="$srcdir"
+
+package() {
+	cd "$_builddir"
+
+	mkdir -p "$pkgdir"/boot/grub "$pkgdir"/sbin
+	touch "$pkgdir"/boot/grub/.keep-compat-pvgrub
+
+	sed "/^version=/s/=.*/=$pkgver-r$pkgrel/" "$srcdir"/update-pvgrub \
+		> "$pkgdir"/sbin/update-pvgrub
+	chmod 755 "$pkgdir"/sbin/update-pvgrub
+}
+
+md5sums="19cc71a4929ebf83df27af57b167cd8e  update-pvgrub"
+sha256sums="ede72f8a3f7091d8e03f15720c1bab0e7da3f6c5bea70811690c84269d50b824  update-pvgrub"
+sha512sums="6b41f5d7280527164ebfa631c04240f6c05854cb31fb839a1e7e5375c5bdc5a608e7e20228dc83d31534c21558c8157a437fb537b6c194f2d220b59a0438c017  update-pvgrub"
diff --git a/main/compat-pvgrub/compat-pvgrub.trigger b/main/compat-pvgrub/compat-pvgrub.trigger
new file mode 100644
index 000000000..541aed7c6
--- /dev/null
+++ b/main/compat-pvgrub/compat-pvgrub.trigger
@@ -0,0 +1,3 @@
+#!/bin/sh
+
+update-pvgrub
diff --git a/main/compat-pvgrub/update-pvgrub b/main/compat-pvgrub/update-pvgrub
new file mode 100755
index 000000000..56594a337
--- /dev/null
+++ b/main/compat-pvgrub/update-pvgrub
@@ -0,0 +1,117 @@
+#!/bin/sh
+
+version=
+default=0
+timeout=5
+verbose=0
+
+conf=/boot/grub/menu.lst
+myconf=/etc/update-extlinux.conf
+
+# read in extlinux settings
+if [ -f "$myconf" ]; then
+	. $myconf
+fi
+
+everbose() {
+	if [ "$verbose" = "0" ]; then
+		return
+	fi
+
+	echo $*
+}
+
+ewarn() {
+	echo "WARNING:" $@ >&2
+}
+
+eerror() {
+	echo "ERROR:" $@ >&2
+	return 1
+}
+
+everbose "Updating extlinux configuration."
+
+if [ "x$root" = "x" ]; then
+	ewarn "Root device is not specified in $myconf."
+	blkid_export=$(blkid -o export /dev/root)
+	if [ -n "$blkid_export" ]; then
+		export $blkid_export
+	fi
+	if [ -z "$UUID" ]; then
+		# try parse /proc/mount for mounted /
+		dev=$(awk '$2 == "/" {dev=$1} END {print dev}' /proc/mounts)
+		if [ -n "$dev" ]; then
+			blkid_export=$(blkid -o export $dev)
+			if [ -n "$blkid_export" ]; then
+				export "$blkid_export"
+			fi
+		fi
+	fi
+	if [ -z "$UUID" ]; then
+		if [ -z "$dev" ]; then
+			eerror "Failed to detect root device"
+			exit 1
+		else
+			root=$dev
+		fi
+	else
+		root=UUID=$UUID
+	fi
+	everbose "Root device is: $root"
+fi
+
+menu_hidden=
+
+umask 0022
+rm -f $conf.new
+echo "# Generated by update-pvgrub $version" > $conf.new
+echo "default 0" >> $conf.new
+if [ "$hidden" = "1" ]; then
+	echo "hiddenmenu" >> $conf.new
+fi
+echo "timeout $rtimeout" >> $conf.new
+
+lst=0
+
+for kernel in $(find /boot -name "vmlinuz-*" -type f); do
+	tag=$(basename $kernel | cut -b9-)
+	everbose "Found kernel: $kernel"
+	label=$(grep -w -l $tag /usr/share/kernel/*/kernel.release | cut -d/ -f5)
+	if [ -z "$label" ]; then
+		label=$lst
+	fi
+	echo "title Linux $tag" >> $conf.new
+	echo "root (hd0)" >> $conf.new
+	echo "kernel /boot/$(basename $kernel) root=$root modules=${modules}${TYPE:+,$TYPE} $default_kernel_opts" >> $conf.new
+	if [ -f "/boot/initramfs-$tag" ]; then
+		everbose "Found initramfs: /boot/initramfs-$tag"
+		echo "initrd /boot/initramfs-$tag" >> $conf.new
+	fi
+	echo "" >> $conf.new
+	lst=$(($lst + 1))
+done
+
+if [ -n "$password" ]; then
+	echo "password --md5 $password" >> $conf.new
+	echo "" >> $conf.new
+	chmod o-r $conf.new
+fi
+
+everbose "$lst entries found."
+
+if cmp -s $conf.new $conf; then
+	everbose "Configuration unchanged."
+	rm $conf.new
+fi
+
+if [ "$overwrite" != "1" ]; then
+	exit 0
+elif [ -f "$conf.new" ]; then
+	# keep a backup just in case
+	if [ -f "$conf" ]; then
+		mv $conf $conf.old
+	fi
+
+	mv $conf.new $conf
+fi