[pmg-devel] [PATCH pve-common v2 1/1] add PBSClient module

[Stoiko Ivanov <s.ivanov@proxmox.com>]

PBSClient.pm contains methods for:
* handling (sensitive) config-information (passwords, encryption keys)
* creating/restoring/forgetting/listing backups

code is mostly based on the current PBSPlugin in pve-storage

Signed-off-by: Stoiko Ivanov <s.ivanov@proxmox.com>
---
 src/Makefile         |   1 +
 src/PVE/PBSClient.pm | 305 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 306 insertions(+)
 create mode 100644 src/PVE/PBSClient.pm

diff --git a/src/Makefile b/src/Makefile
index 1987d0e..727019a 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -20,6 +20,7 @@ LIB_SOURCES = \
 	LDAP.pm \
 	Network.pm \
 	OTP.pm \
+	PBSClient.pm \
 	PTY.pm \
 	ProcFSTools.pm \
 	RESTEnvironment.pm \
diff --git a/src/PVE/PBSClient.pm b/src/PVE/PBSClient.pm
new file mode 100644
index 0000000..1d9a9f4
--- /dev/null
+++ b/src/PVE/PBSClient.pm
@@ -0,0 +1,305 @@
+package PVE::PBSClient;
+
+# utility functions for interaction with Proxmox Backup Server
+
+use strict;
+use warnings;
+use Fcntl qw(F_GETFD F_SETFD FD_CLOEXEC);
+use IO::File;
+use JSON;
+use POSIX qw(strftime ENOENT);
+
+use PVE::Tools qw(run_command file_set_contents file_get_contents file_read_firstline);
+use PVE::JSONSchema qw(get_standard_option);
+
+sub new {
+    my ($class, $scfg, $storeid, $sdir) = @_;
+
+    die "no section config provided\n" if ref($scfg) eq '';
+    die "undefined store id\n" if !defined($storeid);
+
+    my $secret_dir = $sdir // '/etc/pve/priv/storage';
+
+    my $self = bless { scfg => $scfg, storeid => $storeid, secret_dir => $secret_dir }, $class;
+}
+
+my sub password_file_name {
+    my ($self) = @_;
+
+    return "$self->{secret_dir}/$self->{storeid}.pw";
+}
+
+sub set_password {
+    my ($self, $password) = @_;
+
+    my $pwfile = password_file_name($self);
+    mkdir $self->{secret_dir};
+
+    PVE::Tools::file_set_contents($pwfile, "$password\n", 0600);
+};
+
+sub delete_password {
+    my ($self) = @_;
+
+    my $pwfile = password_file_name($self);
+
+    unlink $pwfile;
+};
+
+sub get_password {
+    my ($self) = @_;
+
+    my $pwfile = password_file_name($self);
+
+    return PVE::Tools::file_read_firstline($pwfile);
+}
+
+sub encryption_key_file_name {
+    my ($self) = @_;
+
+    return "$self->{secret_dir}/$self->{storeid}.enc";
+};
+
+sub set_encryption_key {
+    my ($self, $key) = @_;
+
+    my $encfile = encryption_key_file_name($self);
+    mkdir $self->{secret_dir};
+
+    PVE::Tools::file_set_contents($encfile, "$key\n", 0600);
+};
+
+sub delete_encryption_key {
+    my ($self) = @_;
+
+    my $encfile = encryption_key_file_name($self);
+
+    if (!unlink $encfile) {
+	return if $! == ENOENT;
+	die "failed to delete encryption key! $!\n";
+    }
+};
+
+# Returns a file handle if there is an encryption key, or `undef` if there is not. Dies on error.
+my sub open_encryption_key {
+    my ($self) = @_;
+
+    my $encryption_key_file = encryption_key_file_name($self);
+
+    my $keyfd;
+    if (!open($keyfd, '<', $encryption_key_file)) {
+	return undef if $! == ENOENT;
+	die "failed to open encryption key: $encryption_key_file: $!\n";
+    }
+
+    return $keyfd;
+}
+
+my $USE_CRYPT_PARAMS = {
+    backup => 1,
+    restore => 1,
+    'upload-log' => 1,
+};
+
+my sub do_raw_client_cmd {
+    my ($self, $client_cmd, $param, %opts) = @_;
+
+    my $use_crypto = $USE_CRYPT_PARAMS->{$client_cmd};
+
+    my $client_exe = '/usr/bin/proxmox-backup-client';
+    die "executable not found '$client_exe'! Proxmox backup client not installed?\n"
+	if ! -x $client_exe;
+
+    my $scfg = $self->{scfg};
+    my $server = $scfg->{server};
+    my $datastore = $scfg->{datastore};
+    my $username = $scfg->{username} // 'root@pam';
+
+    my $userns_cmd = delete $opts{userns_cmd};
+
+    my $cmd = [];
+
+    push @$cmd, @$userns_cmd if defined($userns_cmd);
+
+    push @$cmd, $client_exe, $client_cmd;
+
+    # This must live in the top scope to not get closed before the `run_command`
+    my $keyfd;
+    if ($use_crypto) {
+	if (defined($keyfd = open_encryption_key($self))) {
+	    my $flags = fcntl($keyfd, F_GETFD, 0)
+		// die "failed to get file descriptor flags: $!\n";
+	    fcntl($keyfd, F_SETFD, $flags & ~FD_CLOEXEC)
+		or die "failed to remove FD_CLOEXEC from encryption key file descriptor\n";
+	    push @$cmd, '--crypt-mode=encrypt', '--keyfd='.fileno($keyfd);
+	} else {
+	    push @$cmd, '--crypt-mode=none';
+	}
+    }
+
+    push @$cmd, @$param if defined($param);
+
+    push @$cmd, "--repository", "$username\@$server:$datastore";
+
+    local $ENV{PBS_PASSWORD} = get_password($self);
+
+    local $ENV{PBS_FINGERPRINT} = $scfg->{fingerprint};
+
+    # no ascii-art on task logs
+    local $ENV{PROXMOX_OUTPUT_NO_BORDER} = 1;
+    local $ENV{PROXMOX_OUTPUT_NO_HEADER} = 1;
+
+    if (my $logfunc = $opts{logfunc}) {
+	$logfunc->("run: " . join(' ', @$cmd));
+    }
+
+    run_command($cmd, %opts);
+}
+
+my sub run_raw_client_cmd {
+    my ($self, $client_cmd, $param, %opts) = @_;
+    return do_raw_client_cmd($self, $client_cmd, $param, %opts);
+}
+
+my sub run_client_cmd {
+    my ($self, $client_cmd, $param, $no_output) = @_;
+
+    my $json_str = '';
+    my $outfunc = sub { $json_str .= "$_[0]\n" };
+
+    $param = [] if !defined($param);
+    $param = [ $param ] if !ref($param);
+
+    $param = [@$param, '--output-format=json'] if !$no_output;
+
+    do_raw_client_cmd($self, $client_cmd, $param,
+		      outfunc => $outfunc, errmsg => 'proxmox-backup-client failed');
+
+    return undef if $no_output;
+
+    my $res = decode_json($json_str);
+
+    return $res;
+}
+
+sub autogen_encryption_key {
+    my ($self) = @_;
+    my $encfile = encryption_key_file_name($self);
+    run_command(['proxmox-backup-client', 'key', 'create', '--kdf', 'none', $encfile]);
+};
+
+sub get_snapshots {
+    my ($self, $opts) = @_;
+
+    my $param = [];
+    if (defined($opts->{group})) {
+	push @$param, $opts->{group};
+    }
+
+    return run_client_cmd($self, "snapshots", $param);
+};
+
+sub backup_tree {
+    my ($self, $opts) = @_;
+
+    my $type = delete $opts->{type};
+    die "backup-type not provided\n" if !defined($type);
+    my $id = delete $opts->{id};
+    die "backup-id not provided\n" if !defined($id);
+    my $root = delete $opts->{root};
+    die "root dir not provided\n" if !defined($root);
+    my $pxarname = delete $opts->{pxarname};
+    die "archive name not provided\n" if !defined($pxarname);
+    my $time = delete $opts->{time};
+
+    my $param = [];
+
+    push @$param, "$pxarname.pxar:$root";
+    push @$param, '--backup-type', $type;
+    push @$param, '--backup-id', $id;
+    push @$param, '--backup-time', $time if defined($time);
+
+    return run_raw_client_cmd($self, 'backup', $param, %$opts);
+};
+
+sub restore_pxar {
+    my ($self, $opts) = @_;
+
+    my $snapshot = delete $opts->{snapshot};
+    die "snapshot not provided\n" if !defined($snapshot);
+    my $pxarname = delete $opts->{pxarname};
+    die "archive name not provided\n" if !defined($pxarname);
+    my $target = delete $opts->{target};
+    die "restore-target not provided\n" if !defined($target);
+    #my $time = delete $opts->{time};
+
+    my $param = [];
+
+    push @$param, "$snapshot";
+    push @$param, "$pxarname.pxar";
+    push @$param, "$target";
+    push @$param, "--allow-existing-dirs", 0;
+
+    return run_raw_client_cmd($self, 'restore', $param, %$opts);
+};
+
+sub forget_snapshot {
+    my ($self, $snapshot) = @_;
+
+    die "snapshot not provided\n" if !defined($snapshot);
+
+    my $param = [];
+
+    push @$param, "$snapshot";
+
+    return run_raw_client_cmd($self, 'forget', $param);
+};
+
+sub prune_group {
+    my ($self, $opts, $prune_opts, $group) = @_;
+
+    die "group not provided\n" if !defined($group);
+
+    # do nothing if no keep options specified for remote
+    return [] if scalar(keys %$prune_opts) == 0;
+
+    my $param = [];
+
+    push @$param, "--quiet";
+
+    if (defined($opts->{'dry-run'}) && $opts->{'dry-run'}) {
+	push @$param, "--dry-run", $opts->{'dry-run'};
+    }
+
+    foreach my $keep_opt (keys %$prune_opts) {
+	push @$param, "--$keep_opt", $prune_opts->{$keep_opt};
+    }
+    push @$param, "$group";
+
+    return run_client_cmd($self, 'prune', $param);
+};
+
+sub status {
+    my ($self) = @_;
+
+    my $total = 0;
+    my $free = 0;
+    my $used = 0;
+    my $active = 0;
+
+    eval {
+	my $res = run_client_cmd($self, "status");
+
+	$active = 1;
+	$total = $res->{total};
+	$used = $res->{used};
+	$free = $res->{avail};
+    };
+    if (my $err = $@) {
+	warn $err;
+    }
+
+    return ($total, $free, $used, $active);
+};
+
+1;
-- 
2.20.1