29027fd1e1
Using pkgs.lib on the spine of module evaluation is problematic because the pkgs argument depends on the result of module evaluation. To prevent an infinite recursion, pkgs and some of the modules are evaluated twice, which is inefficient. Using ‘with lib’ prevents this problem.
134 lines
3.2 KiB
Nix
134 lines
3.2 KiB
Nix
{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.systemhealth;
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systemhealth = with pkgs; stdenv.mkDerivation {
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name = "systemhealth-1.0";
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src = fetchurl {
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url = "http://www.brianlane.com/static/downloads/systemhealth/systemhealth-1.0.tar.bz2";
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sha256 = "1q69lz7hmpbdpbz36zb06nzfkj651413n9icx0njmyr3xzq1j9qy";
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};
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buildInputs = [ python ];
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installPhase = ''
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ensureDir $out/bin
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# Make it work for kernels 3.x, not so different than 2.6
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sed -i 's/2\.6/4.0/' system_health.py
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cp system_health.py $out/bin
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'';
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};
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rrdDir = "/var/lib/health/rrd";
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htmlDir = "/var/lib/health/html";
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configFile = rrdDir + "/.syshealthrc";
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# The program will try to read $HOME/.syshealthrc, so we set the proper home.
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command = "HOME=${rrdDir} ${systemhealth}/bin/system_health.py";
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cronJob = ''
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*/5 * * * * wwwrun ${command} --log
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5 * * * * wwwrun ${command} --graph
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'';
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nameEqualName = s: "${s} = ${s}";
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interfacesSection = concatStringsSep "\n" (map nameEqualName cfg.interfaces);
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driveLine = d: "${d.path} = ${d.name}";
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drivesSection = concatStringsSep "\n" (map driveLine cfg.drives);
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in
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{
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options = {
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services.systemhealth = {
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enable = mkOption {
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default = false;
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description = ''
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Enable the system health monitor and its generation of graphs.
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'';
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};
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urlPrefix = mkOption {
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default = "/health";
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description = ''
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The URL prefix under which the System Health web pages appear in httpd.
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'';
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};
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interfaces = mkOption {
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default = [ "lo" ];
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example = [ "lo" "eth0" "eth1" ];
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description = ''
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Interfaces to monitor (minimum one).
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'';
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};
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drives = mkOption {
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default = [ ];
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example = [ { name = "root"; path = "/"; } ];
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description = ''
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Drives to monitor.
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'';
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};
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};
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};
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config = mkIf cfg.enable {
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services.cron.systemCronJobs = [ cronJob ];
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system.activationScripts.systemhealth = stringAfter [ "var" ]
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''
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mkdir -p ${rrdDir} ${htmlDir}
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chown wwwrun:wwwrun ${rrdDir} ${htmlDir}
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cat >${configFile} << EOF
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[paths]
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rrdtool = ${pkgs.rrdtool}/bin/rrdtool
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loadavg_rrd = loadavg
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ps = /run/current-system/sw/bin/ps
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df = /run/current-system/sw/bin/df
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meminfo_rrd = meminfo
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uptime_rrd = uptime
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rrd_path = ${rrdDir}
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png_path = ${htmlDir}
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[processes]
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[interfaces]
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${interfacesSection}
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[drives]
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${drivesSection}
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[graphs]
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width = 400
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time = ['-3hours', '-32hours', '-8days', '-5weeks', '-13months']
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height = 100
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[external]
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EOF
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chown wwwrun:wwwrun ${configFile}
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${pkgs.su}/bin/su -s "/bin/sh" -c "${command} --check" wwwrun
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${pkgs.su}/bin/su -s "/bin/sh" -c "${command} --html" wwwrun
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'';
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services.httpd.extraSubservices = [
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{ function = f: {
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extraConfig = ''
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Alias ${cfg.urlPrefix} ${htmlDir}
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<Directory ${htmlDir}>
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Order allow,deny
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Allow from all
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</Directory>
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'';
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};
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}
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];
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};
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}
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