virt-what.in: make option processing portable

[virt-what.git] / virt-what.in

diff --git a/virt-what.in b/virt-what.in
index f12c95b..f2c0b90 100644 (file)
--- a/virt-what.in
+++ b/virt-what.in
@@ -1,4 +1,4 @@
-#!/bin/bash -
+#!/bin/sh -
 # @configure_input@
 # Copyright (C) 2008-2011 Red Hat Inc.
 #
@@ -18,13 +18,13 @@
 
 # 'virt-what' tries to detect the type of virtualization being
 # used (or none at all if we're running on bare-metal).  It prints
-# out one of more lines each being a 'fact' about the virtualization.
+# out one or more lines each being a 'fact' about the virtualization.
 #
 # Please see also the manual page virt-what(1).
 # This script should be run as root.
 #
 # The following resources were useful in writing this script:
-# . http://www.dmo.ca/blog/20080530151107
+# . http://dmo.ca/blog/detecting-virtualization-on-linux/
 
 # Do not allow unset variables, and set defaults.
 set -u
@@ -33,12 +33,16 @@ skip_qemu_kvm=false
 
 VERSION="@VERSION@"
 
-function fail {
+have_cpuinfo() {
+    test -e "${root}/proc/cpuinfo"
+}
+
+fail() {
     echo "virt-what: $1" >&2
     exit 1
 }
 
-function usage {
+usage() {
     echo "virt-what [options]"
     echo "Options:"
     echo "  --help          Display this help"
@@ -47,38 +51,42 @@ function usage {
 }
 
 # Handle the command line arguments, if any.
-
-TEMP=$(getopt -o v --long help --long version --long test-root: -n 'virt-what' -- "$@")
-if [ $? != 0 ]; then exit 1; fi
-eval set -- "$TEMP"
-
-while true; do
+while test $# -gt 0; do
     case "$1" in
        --help) usage ;;
-        --test-root)
+        --test-root=*)
             # Deliberately undocumented: used for 'make check'.
-            root="$2"
-            shift 2
+            root=$(echo "$1" | sed 's/.*=//')
+            shift 1
+            test -z "$root" && fail "--test-root option requires a value"
             ;;
        -v|--version) echo "$VERSION"; exit 0 ;;
        --) shift; break ;;
-       *) fail "internal error ($1)" ;;
+       *) fail "unrecognized option '$1'";;
     esac
 done
+test $# -gt 0 && fail "extra operand '$1'"
 
 # Add /sbin and /usr/sbin to the path so we can find system
-# binaries like dmicode.
+# binaries like dmidecode.
 # Add /usr/libexec to the path so we can find the helper binary.
 prefix=@prefix@
 exec_prefix=@exec_prefix@
 PATH="${root}@libexecdir@:${root}/sbin:${root}/usr/sbin:${PATH}"
 
 # Check we're running as root.
+EFFUID=$(id -u) || fail "failed to get current user id"
 
-if [ "x$root" = "x" ] && [ "$EUID" -ne 0 ]; then
+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.
 
@@ -145,18 +153,25 @@ if [ -e "${root}/proc/1/environ" ] &&
 fi
 
 # Check for Linux-VServer
-if cat "${root}/proc/self/status" | grep -q "VxID: [0-9]*"; then
+if test -e "${root}/proc/self/status" \
+   && cat "${root}/proc/self/status" | grep -q "VxID: [0-9]*"; then
     echo linux_vserver
+    if grep -q "VxID: 0$" "${root}/proc/self/status"; then
+        echo linux_vserver-host
+    else
+        echo linux_vserver-guest
+    fi
 fi
 
 # Check for UML.
 # Added by Laurent Léonard.
-if grep -q 'UML' "${root}/proc/cpuinfo"; then
+if have_cpuinfo && grep -q 'UML' "${root}/proc/cpuinfo"; then
     echo uml
 fi
 
 # Check for IBM PowerVM Lx86 Linux/x86 emulator.
-if grep -q '^vendor_id.*PowerVM Lx86' "${root}/proc/cpuinfo"; then
+if have_cpuinfo && grep -q '^vendor_id.*PowerVM Lx86' "${root}/proc/cpuinfo"
+then
     echo powervm_lx86
 fi
 
@@ -167,7 +182,7 @@ if echo "$dmi" | grep -q 'Manufacturer.*HITACHI' &&
 fi
 
 # Check for IBM SystemZ.
-if grep -q '^vendor_id.*IBM/S390' "${root}/proc/cpuinfo"; then
+if have_cpuinfo && grep -q '^vendor_id.*IBM/S390' "${root}/proc/cpuinfo"; then
     echo ibm_systemz
     if [ -f "${root}/proc/sysinfo" ]; then
         if grep -q 'VM.*Control Program.*z/VM' "${root}/proc/sysinfo"; then
@@ -192,9 +207,9 @@ fi
 if [ "$cpuid" = "XenVMMXenVMM" ]; then
     echo xen; echo xen-hvm
     skip_qemu_kvm=true
-elif [ -f "${root}/proc/xen/capabilities" ]; then
+elif [ -d "${root}/proc/xen" ]; then
     echo xen
-    if grep -q "control_d" "${root}/proc/xen/capabilities"; then
+    if grep -q "control_d" "${root}/proc/xen/capabilities" 2>/dev/null; then
         echo xen-dom0
     else
         echo xen-domU
@@ -243,3 +258,8 @@ if ! "$skip_qemu_kvm"; then
        fi
     fi
 fi
+
+# Check for Docker.
+if [ -f "${root}/.dockerinit" ]; then
+       echo docker
+fi