[pve-devel] [PATCH guest-common v6 1/1] add DIR mapping config

[Markus Frank]

adds a config file for directories by using a 'map'
array propertystring for each node mapping.

next to node & path, there are xattr, acl & submounts parameters for
virtiofsd in the map array.

example config:
```
some-dir-id
	map node=node1,path=/mnt/share/,xattr=1,acl=1,submounts=1
	map node=node2,path=/mnt/share/,xattr=1
	map node=node3,path=/mnt/share/,submounts=1
	map node=node4,path=/mnt/share/
```

Signed-off-by: Markus Frank <m.frank at proxmox.com>
---
 src/Makefile           |   1 +
 src/PVE/Mapping/DIR.pm | 175 +++++++++++++++++++++++++++++++++++++++++
 2 files changed, 176 insertions(+)
 create mode 100644 src/PVE/Mapping/DIR.pm

diff --git a/src/Makefile b/src/Makefile
index cbc40c1..876829a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -17,6 +17,7 @@ install: PVE
 	install -d ${PERL5DIR}/PVE/Mapping
 	install -m 0644 PVE/Mapping/PCI.pm ${PERL5DIR}/PVE/Mapping/
 	install -m 0644 PVE/Mapping/USB.pm ${PERL5DIR}/PVE/Mapping/
+	install -m 0644 PVE/Mapping/DIR.pm ${PERL5DIR}/PVE/Mapping/
 	install -d ${PERL5DIR}/PVE/VZDump
 	install -m 0644 PVE/VZDump/Plugin.pm ${PERL5DIR}/PVE/VZDump/
 	install -m 0644 PVE/VZDump/Common.pm ${PERL5DIR}/PVE/VZDump/
diff --git a/src/PVE/Mapping/DIR.pm b/src/PVE/Mapping/DIR.pm
new file mode 100644
index 0000000..a5da042
--- /dev/null
+++ b/src/PVE/Mapping/DIR.pm
@@ -0,0 +1,175 @@
+package PVE::Mapping::DIR;
+
+use strict;
+use warnings;
+
+use PVE::Cluster qw(cfs_register_file cfs_read_file cfs_lock_file cfs_write_file);
+use PVE::JSONSchema qw(get_standard_option parse_property_string);
+use PVE::SectionConfig;
+use PVE::INotify;
+
+use base qw(PVE::SectionConfig);
+
+my $FILENAME = 'mapping/dir.cfg';
+
+cfs_register_file($FILENAME,
+                  sub { __PACKAGE__->parse_config(@_); },
+                  sub { __PACKAGE__->write_config(@_); });
+
+
+# so we don't have to repeat the type every time
+sub parse_section_header {
+    my ($class, $line) = @_;
+
+    if ($line =~ m/^(\S+)\s*$/) {
+	my $id = $1;
+	my $errmsg = undef; # set if you want to skip whole section
+	eval { PVE::JSONSchema::pve_verify_configid($id) };
+	$errmsg = $@ if $@;
+	my $config = {}; # to return additional attributes
+	return ('dir', $id, $errmsg, $config);
+    }
+    return undef;
+}
+
+sub format_section_header {
+    my ($class, $type, $sectionId, $scfg, $done_hash) = @_;
+
+    return "$sectionId\n";
+}
+
+sub type {
+    return 'dir';
+}
+
+my $map_fmt = {
+    node => get_standard_option('pve-node'),
+    path => {
+	description => "Directory-path that should be shared with the guest.",
+	type => 'string',
+	format => 'pve-storage-path',
+    },
+    xattr => {
+	type => 'boolean',
+	description => "Enable support for extended attributes (xattrs).",
+	optional => 1,
+    },
+    acl => {
+	type => 'boolean',
+	description => "Enable support for posix ACLs (implies --xattr).",
+	optional => 1,
+    },
+    submounts => {
+	type => 'boolean',
+	description => "Option to tell the guest which directories are mount points.",
+	optional => 1,
+    },
+    description => {
+	description => "Description of the node specific directory.",
+	type => 'string',
+	optional => 1,
+	maxLength => 4096,
+    },
+};
+
+my $defaultData = {
+    propertyList => {
+        id => {
+            type => 'string',
+            description => "The ID of the directory",
+            format => 'pve-configid',
+        },
+        description => {
+            description => "Description of the directory",
+            type => 'string',
+            optional => 1,
+            maxLength => 4096,
+        },
+        map => {
+            type => 'array',
+            description => 'A list of maps for the cluster nodes.',
+	    optional => 1,
+            items => {
+                type => 'string',
+                format => $map_fmt,
+            },
+        },
+    },
+};
+
+sub private {
+    return $defaultData;
+}
+
+sub options {
+    return {
+        description => { optional => 1 },
+        map => {},
+    };
+}
+
+sub assert_valid {
+    my ($dir_cfg) = @_;
+
+    my $path = $dir_cfg->{path};
+
+    if (! -e $path) {
+        die "Path $path does not exist\n";
+    }
+    if ((-e $path) && (! -d $path)) {
+        die "Path $path exists but is not a directory\n"
+    }
+
+    return 1;
+};
+
+sub config {
+    return cfs_read_file($FILENAME);
+}
+
+sub lock_dir_config {
+    my ($code, $errmsg) = @_;
+
+    cfs_lock_file($FILENAME, undef, $code);
+    my $err = $@;
+    if ($err) {
+        $errmsg ? die "$errmsg: $err" : die $err;
+    }
+}
+
+sub write_dir_config {
+    my ($cfg) = @_;
+
+    cfs_write_file($FILENAME, $cfg);
+}
+
+sub find_on_current_node {
+    my ($id) = @_;
+
+    my $cfg = config();
+    my $node = PVE::INotify::nodename();
+
+    return get_node_mapping($cfg, $id, $node);
+}
+
+sub get_node_mapping {
+    my ($cfg, $id, $nodename) = @_;
+
+    return undef if !defined($cfg->{ids}->{$id});
+
+    my $res = [];
+    my $mapping_list = $cfg->{ids}->{$id}->{map};
+    foreach my $map (@{$mapping_list}) {
+	my $entry = eval { parse_property_string($map_fmt, $map) };
+	warn $@ if $@;
+	if ($entry && $entry->{node} eq $nodename) {
+	    push $res->@*, $entry;
+	}
+    }
+    return $res;
+}
+
+PVE::Mapping::DIR->register();
+PVE::Mapping::DIR->init();
+
+1;
-- 
2.39.2