91 lines
2.6 KiB
Diff
91 lines
2.6 KiB
Diff
From: Petr Tesarik <ptesarik@suse.cz>
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Subject: Unquote parameters written to Xen EFI config file
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References: bsc#900418
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Patch-mainline: not yet
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The GRUB_CMDLINE_* value is copied verbatim to grub.conf, so it is first
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parsed by GRUB2 before being passed down to the kernel. OTOH Xen EFI loader
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takes the config file options verbatim. This means that any special GRUB2
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syntax must be evaluated when generating that file.
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Of course, some things are not even possible (e.g. substituting GRUB runtime
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variables), but let's call them known limitations.
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Signed-off-by: Petr Tesarik <ptesarik@suse.cz>
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---
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util/grub.d/20_linux_xen.in | 54 ++++++++++++++++++++++++++++++++++++++++++--
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1 file changed, 52 insertions(+), 2 deletions(-)
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--- a/util/grub.d/20_linux_xen.in
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+++ b/util/grub.d/20_linux_xen.in
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@@ -139,6 +139,52 @@
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is_efi=false
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fi
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+grub2_unquote ()
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+{
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+ awk '
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+ BEGIN {
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+ bare = "[^{}|&$;<> \t\n'\''\"\\\\]+"
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+ esc = "\\\\."
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+ id = "[[:alpha:]_][[:alnum:]_]*|[[:digit:]]+|[?#*@]"
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+ var = "\\$("id")|\\$\\{("id")\\}"
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+ dqesc = "\\\\[$\"\\\\]"
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+ dqstr = "\\$?\"([^\"]|"var"|"dqesc")*\""
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+ sqstr = "'\''[^'\'']*'\''"
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+ pat = bare"|"esc"|"var"|"dqstr"|"sqstr
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+ ORS = ""
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+ }
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+ {
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+ patsplit($0, words, pat, sep)
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+ print sep[0]
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+ for (i in words) {
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+ w = words[i]
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+ if (w ~ /^\$?"/) {
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+ # Double-quoted string
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+ patsplit(w, segs, var"|"dqesc, ssep)
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+ print ssep[0]
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+ for (j in segs) {
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+ if (segs[j] ~ /^\\/)
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+ print substr(segs[j], 2)
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+ print ssep[j]
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+ }
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+ } else if (w ~ /^'\''/) {
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+ # Single-quoted string
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+ print substr(w, 2, length(w)-2)
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+ } else if (w ~ /^\\/) {
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+ # Escape sequence
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+ print substr(w, 2)
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+ } else if (w ~ /^\$/) {
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+ # Variable expansion
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+ } else {
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+ # Bare word
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+ print w
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+ }
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+ print sep[i]
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+ }
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+ print "\n"
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+ }'
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+}
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+
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linux_entry ()
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{
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linux_entry_xsm "$@" false
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@@ -209,11 +255,13 @@
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else
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section="failsafe.$section_count"
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fi
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+ xen_args_unq=$(echo $xen_args | grub2_unquote)
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+ args_unq=$(echo $args | grub2_unquote)
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cat <<-EOF >> $grub_dir/$xen_cfg
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[$section]
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- options=${xen_args}
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- kernel=${basename} root=${linux_root_device_thisversion} ${args}
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+ options=${xen_args_unq}
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+ kernel=${basename} root=${linux_root_device_thisversion} ${args_unq}
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ramdisk=${initrd_real}
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EOF
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message="$(gettext_printf "Loading Xen %s with Linux %s ..." ${xen_version} ${version})"
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