nix/pkgs: add prometheus-snmp-config

nix/pkgs/default.nix

@@ -25,5 +25,6 @@
   hp-rom = import ./hp-rom.nix args;
   enigma = import ./enigma.nix args;
   alertmanager-discord = pkgs.callPackage ./alertmanager-discord.nix {};
+  prometheus-snmp-config = import ./prometheus-snmp-config args;
 } // (import ./heptapod-runner.nix args)
   // (import ./lightspeed args)

nix/pkgs/prometheus-snmp-config/default.nix

@@ -0,0 +1,84 @@
+{ depot, pkgs, ... }:
+let
+  inherit (pkgs) prometheus-snmp-exporter curl cacert unzip p7zip;
+
+  hpMibs = pkgs.stdenvNoCC.mkDerivation rec {
+    pname = "hp-mibs";
+    version = "11.50";
+
+    src = pkgs.fetchurl {
+      url = "https://downloads.hpe.com/pub/softlib2/software1/pubsw-linux/p1580676047/v188074/upd11.50mib.tar.gz";
+      hash = "sha256:0jxxcirbvhlqrflj0j2vzddqaq7wl7v3g7xi0gcjmxlj6rfkk7i9";
+    };
+    sourceRoot = ".";
+
+    buildPhase = ":";
+    installPhase = ''
+      mkdir $out
+      cp $(ls | grep -i '\.mib$') $out
+    '';
+  };
+
+  mibsDrv = pkgs.stdenvNoCC.mkDerivation {
+    pname = "prometheus-snmp-mibs";
+    version = "lukegb-${prometheus-snmp-exporter.version}";
+
+    outputHashMode = "recursive";
+    outputHash = "sha256:164zv3cvxj9i1parww9nx8a7xihiklwyn7635r0xqdfj365g2fdh";
+
+    buildInputs = [
+      curl
+      p7zip
+      prometheus-snmp-exporter
+      unzip
+    ];
+    passthru.hp = hpMibs;
+
+    CURL_OPTS = "--retry 3 --retry-delay 3 --compressed --location --fail";
+    SSL_CERT_FILE = "${cacert}/etc/ssl/certs/ca-bundle.crt";
+
+    src = prometheus-snmp-exporter.src;
+
+    unpackPhase = ''
+      mkdir $NIX_BUILD_TOP/build
+      cp $src/generator/Makefile $NIX_BUILD_TOP/build/Makefile
+    '';
+
+    buildPhase = ''
+      pushd $NIX_BUILD_TOP/build
+      make CURL_OPTS="$CURL_OPTS"
+
+      # Additional mibs...
+      cp ${hpMibs}/cpqhost.mib ./mibs/
+      awk 'BEGIN { p=1 } /INDEX\s+{.+cpqRackServerBladeRack,/ { print "        INDEX { cpqRackServerBladeIndex }"; p=0 } /}/ { if (p==0) { p=2 } } { if (p==1) { print } if (p==2) { p=1 } }' ${hpMibs}/cpqrack.mib > ./mibs/cpqrack.mib
+    '';
+
+    installPhase = ''
+      cp -R $NIX_BUILD_TOP/build/mibs $out
+    '';
+  };
+in
+pkgs.stdenvNoCC.mkDerivation {
+  pname = "prometheus-snmp-config";
+  version = "lukegb";
+
+  src = prometheus-snmp-exporter.src;
+  passthru.mibs = mibsDrv;
+
+  buildInputs = [ prometheus-snmp-exporter ];
+  MIBDIRS = mibsDrv;
+
+  unpackPhase = ''
+    mkdir $NIX_BUILD_TOP/build
+    cat $src/generator/generator.yml ${./generator.yml} > $NIX_BUILD_TOP/build/generator.yml
+  '';
+
+  buildPhase = ''
+    pushd $NIX_BUILD_TOP/build
+    generator generate
+  '';
+
+  installPhase = ''
+    cp $NIX_BUILD_TOP/build/snmp.yml $out
+  '';
+}

nix/pkgs/prometheus-snmp-config/generator.yml

@@ -0,0 +1,11 @@
+# This isn't really a proper YAML file; it is just appended to the generator.yml from upstream.
+
+  hpe:
+    walk:
+      - sysUpTime
+      - cpqRackPowerSupplyTable
+      - cpqRackServerBladeTable
+    lookups:
+      - source_indexes:
+        - cpqRackServerBladeIndex
+        lookup: cpqRackServerBladeName