[pve-devel] [RFC installer 1/6] low level: sys: fetch udev properties

[Aaron Lauterer]

Fetch UDEV device properties (prepended with E:) for NICs and disks and
store them in their own JSON file so that we can use them for filtering.

Signed-off-by: Aaron Lauterer <a.lauterer at proxmox.com>
---
 Proxmox/Makefile            |  1 +
 Proxmox/Sys/Udev.pm         | 54 +++++++++++++++++++++++++++++++++++++
 proxmox-low-level-installer | 14 ++++++++++
 3 files changed, 69 insertions(+)
 create mode 100644 Proxmox/Sys/Udev.pm

diff --git a/Proxmox/Makefile b/Proxmox/Makefile
index d49da80..9561d9b 100644
--- a/Proxmox/Makefile
+++ b/Proxmox/Makefile
@@ -16,6 +16,7 @@ PERL_MODULES=\
     Sys/Command.pm \
     Sys/File.pm \
     Sys/Net.pm \
+    Sys/Udev.pm \
     UI.pm \
     UI/Base.pm \
     UI/Gtk3.pm \
diff --git a/Proxmox/Sys/Udev.pm b/Proxmox/Sys/Udev.pm
new file mode 100644
index 0000000..69d674f
--- /dev/null
+++ b/Proxmox/Sys/Udev.pm
@@ -0,0 +1,54 @@
+package Proxmox::Sys::Udev;
+
+use strict;
+use warnings;
+
+use base qw(Exporter);
+our @EXPORT_OK = qw(disk_details);
+
+my $udev_regex = '^E: ([A-Z_]*)=(.*)$';
+
+my sub fetch_udevadm_info {
+    my ($path) = @_;
+
+    my $info = `udevadm info --path $path --query all`;
+    if (!$info) {
+	warn "no details found for device '${path}'\n";
+	next;
+    }
+    my $details = {};
+    for my $line (split('\n', $info)) {
+	if ($line =~ m/$udev_regex/) {
+	    $details->{$1} = $2;
+	}
+    }
+    return $details;
+}
+
+# return hash of E: properties returned by udevadm
+sub disk_details {
+    my $result = {};
+    for my $data (@{Proxmox::Sys::Block::get_cached_disks()}) {
+	my $index = @$data[0];
+	my $bd = @$data[5];
+	$result->{$index} = fetch_udevadm_info($bd);
+    }
+    return $result;
+}
+
+
+sub nic_details {
+    my $nic_path = "/sys/class/net";
+    my $result = {};
+
+    my $nics = Proxmox::Sys::Net::get_ip_config()->{ifaces};
+
+    for my $index (keys %$nics) {
+	my $name = $nics->{$index}->{name};
+	my $nic = "${nic_path}/${name}";
+	$result->{$name} = fetch_udevadm_info($nic);
+    }
+    return $result;
+}
+
+1;
diff --git a/proxmox-low-level-installer b/proxmox-low-level-installer
index 814961e..99d5b9a 100755
--- a/proxmox-low-level-installer
+++ b/proxmox-low-level-installer
@@ -23,14 +23,17 @@ use Proxmox::Install::ISOEnv;
 use Proxmox::Install::RunEnv;
 
 use Proxmox::Sys::File qw(file_write_all);
+use Proxmox::Sys::Udev;
 
 use Proxmox::Log;
 use Proxmox::Install;
 use Proxmox::Install::Config;
 use Proxmox::UI;
 
+
 my $commands = {
     'dump-env' => 'Dump the current ISO and Hardware environment to base the installer UI on.',
+    'dump-udev' => 'Dump disk and network device info. Used for the auto installation.',
     'start-session' => 'Start an installation session, with command and result transmitted via stdin/out',
     'start-session-test' => 'Start an installation TEST session, with command and result transmitted via stdin/out',
     'help' => 'Output this usage help.',
@@ -85,6 +88,17 @@ if ($cmd eq 'dump-env') {
     my $run_env = Proxmox::Install::RunEnv::query_installation_environment();
     my $run_env_serialized = to_json($run_env, {canonical => 1, utf8 => 1}) ."\n";
     file_write_all($run_env_file, $run_env_serialized);
+} elsif ($cmd eq 'dump-udev') {
+    my $out_dir = $env->{locations}->{run};
+    make_path($out_dir);
+    die "failed to create output directory '$out_dir'\n" if !-d $out_dir;
+
+    my $output = {};
+    $output->{disks} = Proxmox::Sys::Udev::disk_details();
+    $output->{nics} = Proxmox::Sys::Udev::nic_details();
+
+    my $output_serialized = to_json($output, {canonical => 1, utf8 => 1}) ."\n";
+    file_write_all("$out_dir/run-env-udev.json", $output_serialized);
 } elsif ($cmd eq 'start-session') {
     Proxmox::UI::init_stdio({}, $env);
 
-- 
2.39.2