Systemd: add helpers for parsing unit files

taken from pve-storage/PVE/API2/Disks/Directory.pm (and made available as
public sub)

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>

diff --git a/src/PVE/Systemd.pm b/src/PVE/Systemd.pm
index 85b35a34d7e877a9fd1910daf4e7cd937aa4bca8..bcba5eb11ef745e758623a8bf583cef9f0540fc3 100644 (file)
--- a/src/PVE/Systemd.pm
+++ b/src/PVE/Systemd.pm
@@ -7,6 +7,8 @@ use Net::DBus qw(dbus_uint32 dbus_uint64);
 use Net::DBus::Callback;
 use Net::DBus::Reactor;
 
+use PVE::Tools qw(file_set_contents file_get_contents trim);
+
 sub escape_unit {
     my ($val, $is_path) = @_;
 
@@ -163,4 +165,74 @@ sub wait_for_unit_removed($;$) {
     }, $timeout);
 }
 
+sub read_ini {
+    my ($filename) = @_;
+
+    my $content = file_get_contents($filename);
+    my @lines = split /\n/, $content;
+
+    my $result = {};
+    my $section;
+
+    foreach my $line (@lines) {
+       $line = trim($line);
+       if ($line =~ m/^\[([^\]]+)\]/) {
+           $section = $1;
+           if (!defined($result->{$section})) {
+               $result->{$section} = {};
+           }
+       } elsif ($line =~ m/^(.*?)=(.*)$/) {
+           my ($key, $val) = ($1, $2);
+           if (!$section) {
+               warn "key value pair found without section, skipping\n";
+               next;
+           }
+
+           if ($result->{$section}->{$key}) {
+               # make duplicate properties to arrays to keep the order
+               my $prop = $result->{$section}->{$key};
+               if (ref($prop) eq 'ARRAY') {
+                   push @$prop, $val;
+               } else {
+                   $result->{$section}->{$key} = [$prop, $val];
+               }
+           } else {
+               $result->{$section}->{$key} = $val;
+           }
+       }
+       # ignore everything else
+    }
+
+    return $result;
+};
+
+sub write_ini {
+    my ($ini, $filename) = @_;
+
+    my $content = "";
+
+    foreach my $sname (sort keys %$ini) {
+       my $section = $ini->{$sname};
+
+       $content .= "[$sname]\n";
+
+       foreach my $pname (sort keys %$section) {
+           my $prop = $section->{$pname};
+
+           if (!ref($prop)) {
+               $content .= "$pname=$prop\n";
+           } elsif (ref($prop) eq 'ARRAY') {
+               foreach my $val (@$prop) {
+                   $content .= "$pname=$val\n";
+               }
+           } else {
+               die "invalid property '$pname'\n";
+           }
+       }
+       $content .= "\n";
+    }
+
+    file_set_contents($filename, $content);
+};
+
 1;