garlicd: add to index and check for error

The garlicd is now available under garlic.garlid and it requires the
extra-sandbox-path option to be properly set.

garlic/garlicd/default.nix

@@ -0,0 +1,28 @@
+{
+  stdenv
+, nix
+, garlicTool
+}:
+
+let
+  extraPath = "${garlicTool}:${nix}";
+in
+  stdenv.mkDerivation {
+    name = "garlicd";
+    preferLocalBuild = true;
+
+    phases = [ "unpackPhase" "installPhase" ];
+
+    src = ./garlicd;
+
+    unpackPhase = ''
+      cp $src garlicd
+    '';
+
+    installPhase = ''
+      substituteInPlace garlicd \
+        --replace @extraPath@ ${extraPath}
+      mkdir -p $out/bin
+      cp -a garlicd $out/bin
+    '';
+  }

garlic/garlicd/garlicd

@@ -1,11 +1,32 @@
 #!/bin/bash
 
-if [ -z "$1" -o -z "$2" ]; then
-	>&2 echo "usage: garlicd <bscpkgs directory> <mountpoint directory>"
+set -e
+
+msg() {
+  >&2 echo "garlicd: $@"
+} 
+
+if [ -z "$1" ]; then
+  >&2 echo "usage: garlicd <bscpkgs directory>"
+  exit 1
 fi
 
+export PATH="@extraPath@:$PATH"
+
 bscpkgsdir=$(readlink -f "$1")
-mountdir=$(readlink -f "$2")
+
+garlic_sandbox=$(nix show-config |\
+  grep extra-sandbox-paths |\
+  grep -o '/garlic=[^ ]*')
+
+if [ -z "$garlic_sandbox" ]; then
+  msg "Missing extra-sandbox-paths /garlic mountpoint"
+  msg "Check the ~/.config/nix/nix.conf file"
+  exit 1
+fi
+
+mountdir_rel=$(echo "$garlic_sandbox" | sed 's@^/garlic=@@g')
+mountdir=$(readlink -f "$mountdir_rel")
 run="$mountdir/run"
 completed="$mountdir/completed"
 
@@ -14,20 +35,34 @@ completed="$mountdir/completed"
 
 cd "$bscpkgsdir"
 
-echo "Waiting for experiments..."
 
-while read -r line < "$run"; do
-	echo Attempting to run: $line
+while true; do
+  msg "Waiting for experiments ..."
+  read -r tre < "$run"
 
-	echo Copying files to MN4...
-	nix copy --to ssh://mn1 $line
-	results=$(garlic -RFv $line)
-	echo "The results are: $results"
-	drv=$(nix-store -q --deriver $results)
-	echo "drv = $drv"
-	if [ -z "$drv" ]; then
-		echo "Something failed, drv is empty. Check the logs."
-	else
-		echo -n "$drv" >> "$completed"
-	fi
+  msg "Attempting to run: $tre"
+  msg "Copying files to MN4..."
+  # It fails if the user doesn't have nix-store, but is already copied
+  # with the post build hook
+  nix copy --to ssh://mn1 $tre || true
+
+  msg "Launching the experiment..."
+  garlic -R "$tre"
+
+  msg "Fetching results..."
+  results=$(garlic -Fv "$tre")
+
+  msg "results=\"$results\""
+  
+  msg "Searching drv..."
+  drv=$(nix-store -q --deriver $results)
+
+  msg "drv = \"$drv\""
+  if [ -z "$drv" ]; then
+    msg "Something failed, drv is empty. Check the logs."
+    exit 1
+  fi
+
+  echo -n "$drv" >> "$completed"
+  msg "execution completed :-)"
 done

garlic/index.nix

@@ -124,6 +124,10 @@
     resultFromLauncher = l: import (builtins.readFile l);
   };
 
+  garlicd = callPackage ./garlicd/default.nix {
+    garlicTool = bsc.garlic.tool;
+  };
+
   # Apps for Garlic
   apps = callPackage ./apps/index.nix { };