virt-what.in: warn about missing cpuid-virt helper program

Try to find the binary program on the $PATH, and give informative error
message if it wasn't found.

(cherry picked from commit e3e88af8847a4269fb275fd054fc36c5066d5d49)

diff --git a/virt-what.in b/virt-what.in
index 3feeb60..5ae1ccb 100644 (file)
--- a/virt-what.in
+++ b/virt-what.in
@@ -80,6 +80,12 @@ if [ "x$root" = "x" ] && [ "$EFFUID" -ne 0 ]; then
     fail "this script must be run as root"
 fi
 
+# Try to locate the CPU-ID helper program
+CPUID_HELPER=$(which virt-what-cpuid-helper 2>/dev/null)
+if [ -z "$CPUID_HELPER" ] ; then
+    fail "virt-what-cpuid-helper program not found in \$PATH"
+fi
+
 # Many fullvirt hypervisors give an indication through CPUID.  Use the
 # helper program to get this information.