ProcFSTools: add kernel_version

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

src/PVE/ProcFSTools.pm

@@ -80,6 +80,23 @@ sub read_proc_uptime {
     return (0, 0);
 }
 
+sub kernel_version {
+    my $line = PVE::Tools::file_read_firstline("/proc/version");
+
+    if ($line && $line =~ m|^Linux\sversion\s((\d+(?:\.\d+)+)-?(\S+)?)|) {
+        my ($fullversion, $version_numbers, $extra) = ($1, $2, $3);
+
+	# variable names are the one from the Linux kernel Makefile
+	my ($version, $patchlevel, $sublevel) = split(/\./, $version_numbers);
+
+	return wantarray
+	    ? (int($version), int($patchlevel), int($sublevel), $extra, $fullversion)
+	    : $fullversion;
+    }
+
+    return (0, 0, 0, '', '');
+}
+
 sub read_loadavg {
 
     my $line = PVE::Tools::file_read_firstline('/proc/loadavg');

test/Makefile

@@ -6,7 +6,7 @@ all:
 
 export PERLLIB=../src
 
-check: lock_file.test calendar_event_test.test convert_size_test.test
+check: lock_file.test calendar_event_test.test convert_size_test.test procfs_tests.test
 	for d in $(SUBDIRS); do $(MAKE) -C $$d check; done
 
 %.test: %.pl

test/procfs_tests.pl

@@ -0,0 +1,71 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use lib '../src';
+
+use Test::More;
+use Test::MockModule;
+
+use PVE::Tools;
+use PVE::ProcFSTools;
+
+# the proc "state"
+my $proc = {
+    version => '',
+};
+
+my $pve_common_tools;
+$pve_common_tools = Test::MockModule->new('PVE::Tools');
+$pve_common_tools->mock(
+    file_read_firstline => sub {
+	my ($filename) = @_;
+
+	$filename =~ s!^/proc/!!;
+
+	my $res = $proc->{$filename};
+
+	if (ref($res) eq 'CODE') {
+	    $res = $res->();
+	}
+
+	chomp $res;
+	return $res;
+    },
+);
+
+
+# version tests
+
+my @kernel_versions = (
+{
+    version => 'Linux version 5.3.10-1-pve (build@pve) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP PVE 5.3.10-1 (Thu, 14 Nov 2019 10:43:13 +0100)',
+    expect => [5, 3, 10, '1-pve', '5.3.10-1-pve'],
+},
+{
+    version => 'Linux version 5.0.21-5-pve (build@pve) (gcc version 8.3.0 (Debian 8.3.0-6)) #1 SMP PVE 5.0.21-10 (Wed, 13 Nov 2019 08:27:10 +0100)',
+    expect => [5, 0, 21, '5-pve', '5.0.21-5-pve'],
+},
+{
+    version => 'Linux version 5.0.21+ (build@pve) (gcc version 8.3.0 (Debian 8.3.0-6)) #27 SMP Tue Nov 12 10:30:36 CET 2019',
+    expect => [5, 0, 21, '+', '5.0.21+'],
+},
+{
+    version => 'Linu$ version 2 (build@pve) (gcc version 8.3.0 (Debian 8.3.0-6)) #27 SMP Tue Nov 12 10:30:36 CET 2019',
+    expect => [0, 0, 0, '', ''],
+},
+);
+
+subtest 'test kernel_version parser' => sub {
+    for my $test (@kernel_versions) {
+	$proc->{version} = $test->{version};
+
+	my $res = [ PVE::ProcFSTools::kernel_version() ];
+
+	is_deeply($res, $test->{expect}, "got verison <". $res->[4] ."> same as expected");
+    }
+};
+
+
+done_testing();