[pve-devel] [PATCH guest-common 1/5] guesthelpers: move/add safe comparison functions from lxc and qemu

[Oguz Bektas]

move the safe_string_ne and safe_num_ne functions to guesthelpers to
remove duplicate code.

add the new safe_boolean_ne and typesafe_ne helper functions

Signed-off-by: Oguz Bektas <o.bektas at proxmox.com>
---

these will be used in the partial fast plug function in this series

 PVE/GuestHelpers.pm | 49 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 49 insertions(+)

diff --git a/PVE/GuestHelpers.pm b/PVE/GuestHelpers.pm
index 07a62ce..b7133d0 100644
--- a/PVE/GuestHelpers.pm
+++ b/PVE/GuestHelpers.pm
@@ -14,6 +14,55 @@ use Scalar::Util qw(weaken);
 
 our $lockdir = '/var/lock/pve-manager';
 
+# safe variable comparison functions
+
+sub safe_num_ne {
+    my ($a, $b) = @_;
+
+    return 0 if !defined($a) && !defined($b);
+    return 1 if !defined($a);
+    return 1 if !defined($b);
+
+    return $a != $b;
+}
+
+sub safe_string_ne  {
+    my ($a, $b) = @_;
+
+    return 0 if !defined($a) && !defined($b);
+    return 1 if !defined($a);
+    return 1 if !defined($b);
+
+    return $a ne $b;
+}
+
+sub safe_boolean_ne {
+    my ($a, $b) = @_;
+
+    # we don't check if value is defined, since undefined
+    # is false (so it's a valid boolean)
+
+    # negate both values to normalize and compare
+    return !$a != !$b;
+}
+
+sub typesafe_ne {
+    my ($a, $b, $type) = @_;
+
+    return 0 if !defined($a) && !defined($b);
+    return 1 if !defined($a);
+    return 1 if !defined($b);
+
+    if ($type eq 'string') {
+	return safe_string_ne($a, $b);
+    } elsif ($type eq 'number') {
+	return safe_num_ne($a, $b);
+    } elsif ($type eq 'boolean') {
+	return safe_boolean_ne($a, $b);
+    }
+}
+
+
 sub guest_migration_lock {
     my ($vmid, $timeout, $func, @param) = @_;
 
-- 
2.20.1