Fix alpine init to deal with netboot (#296)

Signed-off-by: Itxaka <itxaka.garcia@spectrocloud.com>

packages/alpine/collection.yaml

@@ -1,7 +1,7 @@
 packages:
   - name: "alpine"
     category: "distro-kernel"
-    version: "6.1.33"
+    version: "6.1.34"
     description: "Provides kernel and custom initrd for alpine"
     labels:
       autobump.strategy: "custom"
@@ -11,10 +11,10 @@ packages:
         curl -s https://raw.githubusercontent.com/alpinelinux/aports/3.18-stable/main/linux-lts/APKBUILD | grep "pkgver=" | awk -F"=" '{print $2}'
       autobump.version_hook: |
         curl -s https://raw.githubusercontent.com/alpinelinux/aports/3.18-stable/main/linux-lts/APKBUILD | grep "pkgver=" | awk -F"=" '{print $2}'
-      package.version: "6.1.33"
+      package.version: "6.1.34"
   - name: "alpine-rpi"
     category: "distro-kernel"
-    version: "6.1.33"
+    version: "6.1.34"
     description: "Provides kernel and custom initrd for alpine"
     labels:
       autobump.strategy: "custom"
@@ -24,4 +24,4 @@ packages:
         curl -s https://raw.githubusercontent.com/alpinelinux/aports/3.18-stable/main/linux-rpi/APKBUILD | grep "pkgver=" | awk -F"=" '{print $2}'
       autobump.version_hook: |
         curl -s https://raw.githubusercontent.com/alpinelinux/aports/3.18-stable/main/linux-rpi/APKBUILD | grep "pkgver=" | awk -F"=" '{print $2}'
-      package.version: "6.1.33"
+      package.version: "6.1.34"

packages/alpine/files/initramfs-init

@@ -211,6 +211,15 @@ configure_ip() {
   eend $?
 }
 
+is_url() {
+	case "$1" in
+	http://*|https://*|ftp://*)
+		return 0;;
+	*)
+		return 1;;
+	esac
+}
+
 /bin/busybox mkdir -p "$ROOT"/usr/bin \
 	"$ROOT"/usr/sbin \
 	"$ROOT"/proc \
@@ -296,8 +305,40 @@ if grep -q "rd.neednet=1" /proc/cmdline;then
   configure_ip
 fi
 
-# Path for booting from livecd/netboot/rd.{cos,immucore}.disable
+# Path for booting from netboot
-if grep -q cdroot /proc/cmdline || grep -q netboot /proc/cmdline || grep -q "rd.immucore.disable" /proc/cmdline || grep -q "rd.cos.disable" /proc/cmdline;then
+if grep -q netboot /proc/cmdline; then
+  echo "Netbooting"
+
+  for x in $(cat /proc/cmdline); do
+    # shellcheck disable=SC2039
+    [[ $x = root=live:* ]] || continue
+    root=${x#root=live:}
+  done
+
+  if ! is_url "$root";then
+    echo "$root is not a valid url, cannot continue"
+    echo "initramfs emergency recovery shell launched"
+    exec /bin/busybox sh
+  fi
+  sync
+  # Create mountpoints
+  ebegin "Create mountpoints"
+  mkdir -p /media/root-rw /run/rootfsbase $sysroot/media/root-rw $sysroot/run/rootfsbase
+  eend $?
+
+  ebegin "Download rootfs"
+  wget -q "$root" -O /tmp/rootfs.squashfs
+  eend $?
+
+  # Mount squashfs into loop device
+  ebegin "Mount rootfs as squashfs device"
+  retry 5 losetup /dev/loop0 /tmp/rootfs.squashfs
+  eend $?
+  sync
+fi
+
+# Path for booting from livecd
+if grep -q cdroot /proc/cmdline ;then
   echo "Mounting LiveCD"
   sync
   # Create mountpoints
@@ -318,43 +359,46 @@ if grep -q cdroot /proc/cmdline || grep -q netboot /proc/cmdline || grep -q "rd.
   retry 5 losetup /dev/loop0 /media/root-ro/rootfs.squashfs
   eend $?
   sync
-  # Mount loop device into the rootfsbase
-  ebegin "Mount loop device into rootfsbase"
-  retry 5 mount /dev/loop0 /run/rootfsbase
-  eend $?
-  sync
-  # Mount writable overlay tmpfs
-  ebegin "Mount base overlay"
-  mount -t tmpfs -o "mode=0755,rw,size=25%" root-tmpfs /media/root-rw
-  eend $?
-  sync
-  # Create additional mountpoints and do the overlay mount
-  mkdir -p /media/root-rw/work /media/root-rw/root
-  ebegin "Mount rootfs overlay into sysroot"
-  mount -t overlay -o lowerdir=/run/rootfsbase,upperdir=/media/root-rw/root,workdir=/media/root-rw/work overlayfs $sysroot
-  eend $?
-  sync
-	# immucore to run the initramfs and rootfs stages
-	ebegin "Run immucore"
-	immucore
-	eend $?
-	# Move current mounts into sysroot mounts
-  # shellcheck disable=SC2002
-  cat "$ROOT"/proc/mounts 2>/dev/null | while read DEV DIR TYPE OPTS ; do
-    # shellcheck disable=SC2166
-    if [ "$DIR" != "/" -a "$DIR" != "$sysroot" -a -d "$DIR" ]; then
-      ebegin "Moving $DIR to $sysroot/$DIR"
-      mkdir -p $sysroot/$DIR
-      mount -o move $DIR $sysroot/$DIR
-      eend $?
-    fi
-  done
-	# shellcheck disable=SC2093
-	exec switch_root "$sysroot" "$INIT"
-	echo "initramfs emergency recovery shell launched"
-	exec /bin/busybox sh
 fi
 
+# shared path for netboot and livecd, we expect the rootfs to be already in /dev/loop0
+if grep -q cdroot /proc/cmdline || grep -q netboot /proc/cmdline;then
+    # Mount loop device into the rootfsbase
+    ebegin "Mount loop device into rootfsbase"
+    retry 5 mount /dev/loop0 /run/rootfsbase
+    eend $?
+    sync
+    # Mount writable overlay tmpfs
+    ebegin "Mount base overlay"
+    mount -t tmpfs -o "mode=0755,rw,size=25%" root-tmpfs /media/root-rw
+    eend $?
+    sync
+    # Create additional mountpoints and do the overlay mount
+    mkdir -p /media/root-rw/work /media/root-rw/root
+    ebegin "Mount rootfs overlay into sysroot"
+    mount -t overlay -o lowerdir=/run/rootfsbase,upperdir=/media/root-rw/root,workdir=/media/root-rw/work overlayfs $sysroot
+    eend $?
+    sync
+  	# immucore to run the initramfs and rootfs stages
+  	ebegin "Run immucore"
+  	immucore
+  	eend $?
+  	# Move current mounts into sysroot mounts
+    # shellcheck disable=SC2002
+    cat "$ROOT"/proc/mounts 2>/dev/null | while read DEV DIR TYPE OPTS ; do
+      # shellcheck disable=SC2166
+      if [ "$DIR" != "/" -a "$DIR" != "$sysroot" -a -d "$DIR" ]; then
+        ebegin "Moving $DIR to $sysroot/$DIR"
+        mkdir -p $sysroot/$DIR
+        mount -o move $DIR $sysroot/$DIR
+        eend $?
+      fi
+    done
+  	# shellcheck disable=SC2093
+  	exec switch_root "$sysroot" "$INIT"
+  	echo "initramfs emergency recovery shell launched"
+  	exec /bin/busybox sh
+fi
 
 # Path for booting active/passive/recovery
 ebegin "Run immucore"