Allow calling direnv-cache from subdirectories of $DIRENV_DIR

checkPhase still requires term-test

Closes #1

default.nix

@@ -1,4 +1,9 @@
-{ stdenv, direnv, term-test }:
+{ stdenv
+, direnv
+, term-test ? null
+, doCheck ? true
+}:
+assert doCheck -> term-test != null;
 
 stdenv.mkDerivation {
   name = "direnv-cache";
@@ -8,6 +13,7 @@ stdenv.mkDerivation {
     make install PREFIX=$out
   '';
   checkInputs = [ term-test ];
-  doCheck = true;
+  inherit doCheck;
   passthru = { direnvrc = ./direnvrc; };
+  preferLocalBuild = true;
 }

direnv-cache

@@ -70,9 +70,23 @@ getCacheFilePath() {
     echo "${cacheDir}/$(pwd | sha1sum | tr -d ' -')"
 }
 
+switchToDirenvDir() {
+    # Find directory that contains the current .envrc.  Allows direnv-cache to
+    # be called from subdirectories.
+    wd="$(pwd)"
+
+    if [[ -n $DIRENV_DIR ]]; then
+        wd="${DIRENV_DIR#-}"
+    fi
+
+    cd "$wd"
+}
+
 cmd="$1"
 
-if ! [[ -e .envrc ]]; then
+switchToDirenvDir
+
+if ! [[ -e ".envrc" ]]; then
     echo "Error, no .envrc found in current directory"
     exit 1
 fi
@@ -84,15 +98,15 @@ case $cmd in
         if [[ -n $DIRENV_DIR ]]; then
             # run self in clean environment (i.e. outside of the current direnv
             # environment)
+            echo "Switching to clean environment"
             exec direnv exec /proc "${BASH_SOURCE[0]}" "$@"
         fi
         echo "Re-creating cache"
         mkdir -p "$(dirname ${cacheFile})"
         dumpEnv > "${cacheFile}.pre"
         source <(direnv stdlib)
-        if [[ .envrc -nt ${cacheFile}.recipe ]]; then
-            direnv exec . true > /dev/null
-        fi
+        echo "Re-creating recipe"
+        direnv exec . true > /dev/null
         source "${cacheFile}.recipe"
         dumpEnv > "${cacheFile}.post"
         diffEnvs "${cacheFile}.pre" "${cacheFile}.post" > "$cacheFile"