Signed-off-by: Wolfgang Bumiller <w.bumil...@proxmox.com>
---
src/PVE/LXC/Tools.pm | 51 ++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 51 insertions(+)
diff --git a/src/PVE/LXC/Tools.pm b/src/PVE/LXC/Tools.pm
index 18a1a22..bebd7d8 100644
--- a/src/PVE/LXC/Tools.pm
+++ b/src/PVE/LXC/Tools.pm
@@ -79,4 +79,55 @@ sub lxc_hook($$&) {
$code->($ct_name, $common_vars, $namespaces, $args);
}
+sub for_current_devices($&) {
+ my ($vmid, $code) = @_;
+
+ my $devlist_file = "/var/lib/lxc/$vmid/devices";
+ my $fd;
+
+ if (! open $fd, '<', $devlist_file) {
+ exit 0 if $!{ENOENT}; # If the list is empty the file might not exist.
+ die "failed to open device list: $!\n";
+ }
+
+ while (defined(my $line = <$fd>)) {
+ if ($line !~ m@^(b):(\d+):(\d+):/dev/(\S+)\s*$@) {
+ warn "invalid .pve-devices entry: $line\n";
+ next;
+ }
+
+ my ($type, $major, $minor, $dev) = ($1, $2, $3, $4);
+
+ # Don't break out of $root/dev/
+ if ($dev =~ /\.\./) {
+ warn "skipping illegal device node entry: $dev\n";
+ next;
+ }
+
+ # Never expose /dev/loop-control
+ if ($major == 10 && $minor == 237) {
+ warn "skipping illegal device entry (loop-control) for: $dev\n";
+ next;
+ }
+
+ $code->($type, $major, $minor, $dev);
+ }
+ close $fd;
+}
+
+sub cgroup_do_write($$) {
+ my ($path, $value) = @_;
+ my $fd;
+ if (!open($fd, '>', $path)) {
+ warn "failed to open cgroup file $path: $!\n";
+ return 0;
+ }
+ if (!defined syswrite($fd, $value)) {
+ warn "failed to write value $value to cgroup file $path: $!\n";
+ return 0;
+ }
+ close($fd);
+ return 1;
+}
+
1;
--
2.20.1
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