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[Libguestfs] [PATCH / discussion only] Add kernel and userspace arch detection to virt-inspector



This patch isn't quite finished.  I also need to modify the
virt-inspector "query mode" so that it can display the architecture.
Nevertheless, text and XML output works for both Linux and Windows
guests.

Rich.

-- 
Richard Jones, Emerging Technologies, Red Hat  http://et.redhat.com/~rjones
Read my programming blog: http://rwmj.wordpress.com
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>From f8bcd6b7cc1aa404afdfb0312e31c9848b9c6c28 Mon Sep 17 00:00:00 2001
From: Richard Jones <rjones trick home annexia org>
Date: Wed, 29 Jul 2009 09:48:08 +0100
Subject: [PATCH] inspector: Determine guest architecture.

This commit adds kernel and userspace architecture detection
(fully for Linux, partially for Windows).  It adds an architecture
for each kernel detected, and an architecture for each root (ie.
userspace) found.
---
 TODO                        |   16 -----------
 inspector/virt-inspector.pl |    8 ++++-
 perl/lib/Sys/Guestfs/Lib.pm |   64 +++++++++++++++++++++++++++++++++++++++++--
 3 files changed, 67 insertions(+), 21 deletions(-)

diff --git a/TODO b/TODO
index 291d220..dbfc3c8 100644
--- a/TODO
+++ b/TODO
@@ -182,22 +182,6 @@ Swap space
 
 Allow swap space from the guest to be used.  Is it a good idea?
 
-Query guest architecture
-------------------------
-
-Need a way to query a binary or library file for its architecture.
-Using objdump or readelf?
-What about non-ELF files (eg. Windows, BSD).
-
-To do this properly requires some serious logic, eg. to cover Linux
-and Windows we'd need objdump and i686-pc-mingw32-objdump, and more to
-cover a.out, COFF and 64 bit Windows.  Therefore this cannot be done
-inside the daemon, and should be done by a separate, external program
-similar to virt-inspector.
-
-Probably we should go all the way and have virt-inspector able to
-determine kernel and userspace architectures of guests.
-
 Other initrd-* commands
 -----------------------
 
diff --git a/inspector/virt-inspector.pl b/inspector/virt-inspector.pl
index 9148a48..bf525b0 100755
--- a/inspector/virt-inspector.pl
+++ b/inspector/virt-inspector.pl
@@ -357,6 +357,7 @@ sub output_text_os
 
     print $os->{os}, " " if exists $os->{os};
     print $os->{distro}, " " if exists $os->{distro};
+    print $os->{arch}, " " if exists $os->{arch};
     print $os->{major_version} if exists $os->{major_version};
     print ".", $os->{minor_version} if exists $os->{minor_version};
     print " ";
@@ -415,7 +416,7 @@ sub output_text_os
     print __"  Kernels:\n";
     my @kernels = @{$os->{kernels}};
     foreach (@kernels) {
-	print "    $_->{version}\n";
+	print "    $_->{version} ($_->{arch})\n";
 	my @modules = @{$_->{modules}};
 	foreach (@modules) {
 	    print "      $_\n";
@@ -450,6 +451,7 @@ sub output_xml_os
 
     foreach ( [ "name" => "os" ],
               [ "distro" => "distro" ],
+              [ "arch" => "arch" ],
               [ "major_version" => "major_version" ],
               [ "minor_version" => "minor_version" ],
               [ "package_format" => "package_format" ],
@@ -531,7 +533,9 @@ sub output_xml_os
     $xml->startTag("kernels");
     my @kernels = @{$os->{kernels}};
     foreach (@kernels) {
-        $xml->startTag("kernel", "version" => $_->{version});
+        $xml->startTag("kernel",
+		       "version" => $_->{version},
+		       "arch" => $_->{arch});
         $xml->startTag("modules");
 	my @modules = @{$_->{modules}};
 	foreach (@modules) {
diff --git a/perl/lib/Sys/Guestfs/Lib.pm b/perl/lib/Sys/Guestfs/Lib.pm
index 081b4b9..1e5638e 100644
--- a/perl/lib/Sys/Guestfs/Lib.pm
+++ b/perl/lib/Sys/Guestfs/Lib.pm
@@ -876,6 +876,17 @@ sub _check_linux_root
 	}
 	$r->{fstab} = \ fstab if @fstab;
     }
+
+    # Determine the architecture of this root.
+    my $arch;
+    foreach ("/bin/bash", "/bin/ls", "/bin/echo", "/bin/rm", "/bin/sh") {
+	if ($g->is_file ($_)) {
+	    $arch = file_architecture ($g, $_);
+	    last;
+	}
+    }
+
+    $r->{arch} = $arch if defined $arch;
 }
 
 # We only support NT.  The control file /boot.ini contains a list of
@@ -914,13 +925,30 @@ sub _check_windows_root
 
 	if (defined $systemroot) {
 	    $r->{systemroot} = resolve_windows_path ($g, "/$systemroot");
-	    if (defined $r->{systemroot} && $use_windows_registry) {
-		_check_windows_registry ($g, $r, $r->{systemroot});
+	    if (defined $r->{systemroot}) {
+		_check_windows_arch ($g, $r, $r->{systemroot});
+		if ($use_windows_registry) {
+		    _check_windows_registry ($g, $r, $r->{systemroot});
+		}
 	    }
 	}
     }
 }
 
+# Find Windows userspace arch.
+
+sub _check_windows_arch
+{
+    local $_;
+    my $g = shift;
+    my $r = shift;
+    my $systemroot = shift;
+
+    my $cmd_exe =
+	resolve_windows_path ($g, $r->{systemroot} . "/system32/cmd.exe");
+    $r->{arch} = file_architecture ($g, $cmd_exe) if $cmd_exe;
+}
+
 sub _check_windows_registry
 {
     local $_;
@@ -1034,6 +1062,10 @@ The C<\%os> hash contains the following keys (any can be omitted):
 
 Operating system type, eg. "linux", "windows".
 
+=item arch
+
+Operating system userspace architecture, eg. "i386", "x86_64".
+
 =item distro
 
 Operating system distribution, eg. "debian".
@@ -1118,6 +1150,7 @@ sub _get_os_version
         if exists $r->{root}->{package_format};
     $r->{package_management} = $r->{root}->{package_management}
         if exists $r->{root}->{package_management};
+    $r->{arch} = $r->{root}->{arch} if exists $r->{root}->{arch};
 }
 
 sub _assign_mount_points
@@ -1267,6 +1300,24 @@ List of applications.
 
 List of kernels.
 
+This is a hash of kernel version =E<gt> a hash with the following keys:
+
+=over 4
+
+=item version
+
+Kernel version.
+
+=item arch
+
+Kernel architecture (eg. C<x86-64>).
+
+=item modules
+
+List of modules.
+
+=back
+
 =item modprobe_aliases
 
 (For Linux VMs).
@@ -1359,14 +1410,21 @@ sub _check_for_kernels
 
 		# List modules.
 		my @modules;
-		foreach ($g->find ("/lib/modules/$_")) {
+		my $any_module;
+		my $prefix = "/lib/modules/$_";
+		foreach ($g->find ($prefix)) {
 		    if (m,/([^/]+)\.ko$, || m,([^/]+)\.o$,) {
+			$any_module = "$prefix$_" unless defined $any_module;
 			push @modules, $1;
 		    }
 		}
 
 		$kernel{modules} = \ modules;
 
+		# Determine kernel architecture by looking at the arch
+		# of any kernel module.
+		$kernel{arch} = file_architecture ($g, $any_module);
+
 		push @kernels, \%kernel;
 	    }
 	}
-- 
1.6.2.5


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