File grub2-efi-xen-cfg-unquote.patch of Package grub2

Overview Repositories Revisions Requests Users Attributes Meta

File grub2-efi-xen-cfg-unquote.patch of Package grub2 (Revision 56460300994419f2c1b4ad0066ffa6c3)

Currently displaying revision 56460300994419f2c1b4ad0066ffa6c3 , Show latest

From: Petr Tesarik <ptesarik@suse.cz>
Subject: Unquote parameters written to Xen EFI config file
References: bsc#900418
Patch-mainline: not yet

The GRUB_CMDLINE_* value is copied verbatim to grub.conf, so it is first
parsed by GRUB2 before being passed down to the kernel. OTOH Xen EFI loader
takes the config file options verbatim. This means that any special GRUB2
syntax must be evaluated when generating that file.

Of course, some things are not even possible (e.g. substituting GRUB runtime
variables), but let's call them known limitations.

Signed-off-by: Petr Tesarik <ptesarik@suse.cz>

---
 util/grub.d/20_linux_xen.in |   54 ++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 52 insertions(+), 2 deletions(-)

Index: grub-2.06~rc1/util/grub.d/20_linux_xen.in
===================================================================
--- grub-2.06~rc1.orig/util/grub.d/20_linux_xen.in
+++ grub-2.06~rc1/util/grub.d/20_linux_xen.in
@@ -137,6 +137,52 @@ else
   is_efi=false
 fi
 
+grub2_unquote ()
+{
+  awk '
+    BEGIN   {
+      bare = "[^{}|&$;<> \t\n'\''\"\\\\]+"
+      esc = "\\\\."
+      id = "[[:alpha:]_][[:alnum:]_]*|[[:digit:]]+|[?#*@]"
+      var = "\\$("id")|\\$\\{("id")\\}"
+      dqesc = "\\\\[$\"\\\\]"
+      dqstr = "\\$?\"([^\"]|"var"|"dqesc")*\""
+      sqstr = "'\''[^'\'']*'\''"
+      pat = bare"|"esc"|"var"|"dqstr"|"sqstr
+      ORS = ""
+    }
+    {
+      patsplit($0, words, pat, sep)
+      print sep[0]
+      for (i in words) {
+        w = words[i]
+        if (w ~ /^\$?"/) {
+          # Double-quoted string
+          patsplit(w, segs, var"|"dqesc, ssep)
+          print ssep[0]
+          for (j in segs) {
+            if (segs[j] ~ /^\\/)
+              print substr(segs[j], 2)
+            print ssep[j]
+          }
+        } else if (w ~ /^'\''/) {
+          # Single-quoted string
+          print substr(w, 2, length(w)-2)
+        } else if (w ~ /^\\/) {
+          # Escape sequence
+          print substr(w, 2)
+        } else if (w ~ /^\$/) {
+          # Variable expansion
+        } else {
+          # Bare word
+          print w
+        }
+        print sep[i]
+      }
+      print "\n"
+    }'
+}
+
 linux_entry ()
 {
   linux_entry_xsm "$@" false
@@ -205,11 +251,13 @@ linux_entry_xsm ()
     else
       section="failsafe.$section_count"
     fi
+    xen_args_unq=$(echo $xen_args | grub2_unquote)
+    args_unq=$(echo $args | grub2_unquote)
     cat <<-EOF >> $grub_dir/$xen_cfg
 
 	[$section]
-	options=${xen_args}
-	kernel=${basename} root=${linux_root_device_thisversion} ${args}
+	options=${xen_args_unq}
+	kernel=${basename} root=${linux_root_device_thisversion} ${args_unq}
 	ramdisk=${initrd_real}
 	EOF
     message="$(gettext_printf "Loading Xen %s with Linux %s ..." ${xen_version} ${version})"

Places

File grub2-efi-xen-cfg-unquote.patch of Package grub2 (Revision 56460300994419f2c1b4ad0066ffa6c3)

Places