Generate alternative init entries in advanced menu

Add fallback boot entries for alternative installed init systems.  Based
on patches from Michael Biebl and Didier Roche.

Bug-Debian: https://bugs.debian.org/757298
Bug-Debian: https://bugs.debian.org/773173
Forwarded: no
Last-Update: 2017-06-23

Patch-Name: mkconfig-other-inits.patch

util/grub.d/10_linux.in

@@ -32,6 +32,7 @@ export TEXTDOMAIN=@PACKAGE@
 export TEXTDOMAINDIR="@localedir@"
 
 CLASS="--class gnu-linux --class gnu --class os"
+SUPPORTED_INITS="sysvinit:/lib/sysvinit/init systemd:/lib/systemd/systemd upstart:/sbin/upstart"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
   OS=GNU/Linux
@@ -127,6 +128,8 @@ linux_entry ()
       case $type in
 	  recovery)
 	      title="$(gettext_printf "%s, with Linux %s (%s)" "${os}" "${version}" "$(gettext "${GRUB_RECOVERY_TITLE}")")" ;;
+	  init-*)
+	      title="$(gettext_printf "%s, with Linux %s (%s)" "${os}" "${version}" "${type#init-}")" ;;
 	  *)
 	      title="$(gettext_printf "%s, with Linux %s" "${os}" "${version}")" ;;
       esac
@@ -389,6 +392,13 @@ while [ "x$list" != "x" ] ; do
 
   linux_entry "${OS}" "${version}" advanced \
               "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}"
+  for supported_init in ${SUPPORTED_INITS}; do
+    init_path="${supported_init#*:}"
+    if [ -x "${init_path}" ] && [ "$(readlink -f /sbin/init)" != "$(readlink -f "${init_path}")" ]; then
+      linux_entry "${OS}" "${version}" "init-${supported_init%%:*}" \
+		  "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT} init=${init_path}"
+    fi
+  done
   if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
     linux_entry "${OS}" "${version}" recovery \
                 "${GRUB_CMDLINE_LINUX_RECOVERY} ${GRUB_CMDLINE_LINUX}"

util/grub.d/20_linux_xen.in

@@ -27,6 +27,7 @@ export TEXTDOMAIN=@PACKAGE@
 export TEXTDOMAINDIR="@localedir@"
 
 CLASS="--class gnu-linux --class gnu --class os --class xen"
+SUPPORTED_INITS="sysvinit:/lib/sysvinit/init systemd:/lib/systemd/systemd upstart:/sbin/upstart"
 
 if [ "x${GRUB_DISTRIBUTOR}" = "x" ] ; then
   OS=GNU/Linux
@@ -123,6 +124,8 @@ linux_entry_xsm ()
   if [ x$type != xsimple ] ; then
       if [ x$type = xrecovery ] ; then
 	  title="$(gettext_printf "%s, with Xen %s and Linux %s (%s)" "${os}" "${xen_version}" "${version}" "$(gettext "${GRUB_RECOVERY_TITLE}")")"
+      elif [ "${type#init-}" != "$type" ] ; then
+	  title="$(gettext_printf "%s, with Xen %s and Linux %s (%s)" "${os}" "${xen_version}" "${version}" "${type#init-}")"
       else
 	  title="$(gettext_printf "%s, with Xen %s and Linux %s" "${os}" "${xen_version}" "${version}")"
       fi
@@ -346,6 +349,14 @@ while [ "x${xen_list}" != "x" ] ; do
 
 	linux_entry "${OS}" "${version}" "${xen_version}" advanced \
 	    "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
+	for supported_init in ${SUPPORTED_INITS}; do
+	    init_path="${supported_init#*:}"
+	    if [ -x "${init_path}" ] && [ "$(readlink -f /sbin/init)" != "$(readlink -f "${init_path}")" ]; then
+		linux_entry "${OS}" "${version}" "${xen_version}" "init-${supported_init%%:*}" \
+		    "${GRUB_CMDLINE_LINUX} ${GRUB_CMDLINE_LINUX_DEFAULT} init=${init_path}" "${GRUB_CMDLINE_XEN} ${GRUB_CMDLINE_XEN_DEFAULT}"
+
+	    fi
+	done
 	if [ "x${GRUB_DISABLE_RECOVERY}" != "xtrue" ]; then
 	    linux_entry "${OS}" "${version}" "${xen_version}" recovery \
 		"single ${GRUB_CMDLINE_LINUX}" "${GRUB_CMDLINE_XEN}"