longview: Linode metrics collector

Longview is a perl script used for sending server metrics to Linode
virtual private server hosting.

pkgs/servers/monitoring/longview/default.nix

···
+{stdenv, fetchFromGitHub, perl, perlPackages, makeWrapper, glibc }:
+
+stdenv.mkDerivation rec {
+  version = "1.1.5pre";
+  name = "longview-${version}";
+
+  src = fetchFromGitHub {
+    owner = "linode";
+    repo = "longview";
+    rev = "5bcc9b60896b72de2d14f046f911477c26eb70ba";
+    sha256 = "1i6va44bx2zfgbld7znf1slph0iqidlahq2xh3kd8q4lhvbrjn02";
+  };
+
+  patches =
+    [ # log to systemd journal
+      ./log-stdout.patch
+    ];
+
+  postPatch =
+    ''
+      substituteInPlace Linode/Longview/Util.pm --replace /var/run/longview.pid /run/longview.pid
+    '';
+
+  buildInputs = [ perl makeWrapper glibc ]
+    ++ (with perlPackages; [
+      LWPUserAgent
+      LWPProtocolHttps
+      MozillaCA
+      CryptSSLeay
+      IOSocketInet6
+      LinuxDistribution
+      JSONPP
+      JSON
+      LogLogLite
+      TryTiny
+      DBI
+      DBDmysql
+    ]);
+
+  buildPhase = "true";
+  installPhase = ''
+    mkdir -p $out/bin $out/usr
+    mv Linode $out
+    ln -s ../Linode/Longview.pl $out/bin/longview
+    for h in syscall.h sys/syscall.h asm/unistd.h asm/unistd_32.h asm/unistd_64.h bits/wordsize.h bits/syscall.h; do
+        ${perl}/bin/h2ph -d $out ${glibc}/include/$h
+        mkdir -p $out/usr/include/$(dirname $h)
+        mv $out${glibc}/include/''${h%.h}.ph $out/usr/include/$(dirname $h)
+    done
+    wrapProgram $out/Linode/Longview.pl --prefix PATH : ${perl}/bin:$out/bin \
+     --suffix PERL5LIB : $out/Linode --suffix PERL5LIB : $PERL5LIB \
+     --suffix PERL5LIB : $out --suffix INC : $out
+  '';
+
+  meta = with stdenv.lib; {
+    homepage = https://www.linode.com/longview;
+    description = "Longview collects all of your system-level metrics and sends them to Linode.";
+    license = licenses.gpl2Plus;
+    maintainers = [ maintainers.rvl ];
+    inherit version;
+  };
+}

pkgs/servers/monitoring/longview/log-stdout.patch

···
+diff -ru longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src.orig/Linode/Longview/Logger.pm longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src/Linode/Longview/Logger.pm
+--- longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src.orig/Linode/Longview/Logger.pm	2015-10-28 17:15:32.816515318 +0000
++++ longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src/Linode/Longview/Logger.pm	2015-10-28 18:00:50.760332026 +0000
+@@ -26,9 +26,7 @@
+         my ( $self, $message ) = @_;
+ 
+         my $ts = strftime( '%m/%d %T', localtime );
+-        $self->{logger}->write(
+-            sprintf( '%s %s Longview[%i] - %s', $ts, uc($level), $$, $message ),
+-            $levels->{$level} );
++        printf( "%s %s Longview[%i] - %s\n", $ts, uc($level), $$, $message );
+         die "$message" if $level eq 'logdie';
+     };
+ }
+@@ -37,12 +35,6 @@
+     my ( $class, $level ) = @_;
+     my $self = {};
+ 
+-    mkpath($LOGDIR) unless (-d $LOGDIR);
+-    $self->{logger}
+-        = Log::LogLite->new( $LOGDIR . 'longview.log', $level )
+-        or die "Couldn't create logger object: $!";
+-    $self->{logger}->template("<message>\n");
+-
+     return bless $self, $class;
+ }
+ 
+diff -ru longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src.orig/Linode/Longview/Util.pm longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src/Linode/Longview/Util.pm
+--- longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src.orig/Linode/Longview/Util.pm	2015-10-28 17:15:32.816515318 +0000
++++ longview-5bcc9b60896b72de2d14f046f911477c26eb70ba-src/Linode/Longview/Util.pm	2015-10-28 19:20:30.894314658 +0000
+@@ -225,7 +225,6 @@
+  	#<<<   perltidy ignore
+  	chdir '/'                      or $logger->logdie("Can't chdir to /: $!");
+  	open STDIN, '<', '/dev/null'   or $logger->logdie("Can't read /dev/null: $!");
+- 	open STDOUT, '>>', '/dev/null' or $logger->logdie("Can't write to /dev/null: $!");
+  	open STDERR, '>>', '/dev/null' or $logger->logdie("Can't write to /dev/null: $!");
+ 	tie *STDERR, "Linode::Longview::STDERRLogger";
+  	defined( my $pid = fork )      or $logger->logdie("Can't fork: $!");

pkgs/top-level/all-packages.nix

···
 
   logstalgia = callPackage ../tools/graphics/logstalgia {};
 
+  longview = callPackage ../servers/monitoring/longview { };
+
   lout = callPackage ../tools/typesetting/lout { };
 
   lrzip = callPackage ../tools/compression/lrzip { };