diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 6e677db..c1d7f52 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -67,7 +67,7 @@ jobs:
       - name: Check that dummy.txt was restored
         run: |
           set -e
-          ls -la ~/storage-dir/${{ github.repository }}/_
+          ls -la ~/storage-dir/${{ github.repository }}/*
           [[ "$(cat dummy.txt)" == "dummy" ]] || { echo "dummy.txt must be restored"; exit 1; }
 
       - name: Remove dir/subdir/layer.txt
@@ -81,7 +81,7 @@ jobs:
       - name: Check that dir/subdir/layer.txt was restored, and dummy.txt still exists
         run: |
           set -e
-          ls -la ~/storage-dir/${{ github.repository }}/_.my-layer
+          ls -la ~/storage-dir/${{ github.repository }}/*
           [[ "$(cat dummy.txt)" == "dummy" ]] || { echo "dummy.txt must be kept"; exit 1; }
           [[ "$(cat dir/subdir/layer.txt)" == "layer" ]] || { echo "layer.txt must be restored"; exit 1; }
 
@@ -96,7 +96,7 @@ jobs:
       - name: Check that /tmp/dir/local-dir.txt was restored
         run: |
           set -e
-          ls -la ~/storage-dir/${{ github.repository }}/_tmp_dir
+          ls -la ~/storage-dir/${{ github.repository }}/*
           [[ "$(cat /tmp/dir/local-dir.txt)" == "local-dir" ]] || { echo "/tmp/dir/local-dir.txt must be restored"; exit 1; }
 
   # Tests ci-scaler logic.
diff --git a/action.yml b/action.yml
index 1e107fa..021aa0e 100644
--- a/action.yml
+++ b/action.yml
@@ -45,6 +45,7 @@ runs:
         date
 
         default_run_hash="${{ github.run_id }}"
+        whoami=$(whoami)
 
         action="${{ inputs.action }}"
         storage_host="${{ inputs.storage-host || '' }}"
@@ -61,6 +62,10 @@ runs:
           storage_host=$(cat ~/ci-storage-host)
         fi
 
+        if [[ "$storage_host" != "" && "$storage_host" != *@* ]]; then
+          storage_host="$whoami@$storage_host"
+        fi
+
         if [[ "$slot_id" == "" ]]; then
           slot_id="$default_run_hash"
         elif [[ "$slot_id" == "*" && "$action" == "load" ]]; then
@@ -68,14 +73,7 @@ runs:
           slot_id="$default_run_hash $slot_id"
         fi
 
-        if [[ "$local_dir" == "/" ]]; then
-          echo "You cannot use / as local-dir."
-          exit 1
-        elif [[ "$local_dir" == "." ]]; then
-          storage_dir="$storage_dir/_"
-        else
-          storage_dir="$storage_dir/$(echo "$local_dir" | tr / _)"
-        fi
+        storage_dir="$storage_dir/$(realpath "$local_dir" | tr / _)"
 
         if [[ "$layer_name" != "" ]]; then
           layer_include=${layer_include:-"*"}
@@ -99,7 +97,7 @@ runs:
           "$action"
         )
 
-        if [[ -d "$local_dir" && "$(stat -c '%U' "$local_dir")" != "$(whoami)" ]]; then
+        if [[ -d "$local_dir" && "$(stat -c '%U' "$local_dir")" != "$whoami" ]]; then
           sudo /usr/bin/ci-storage "${args[@]}"
         else
           "${{ github.action_path }}/ci-storage" "${args[@]}"
diff --git a/docker/ci-runner/guest/entrypoint.01-ci-storage-load.sh b/docker/ci-runner/guest/entrypoint.01-ci-storage-load.sh
index a51f04c..088a71a 100644
--- a/docker/ci-runner/guest/entrypoint.01-ci-storage-load.sh
+++ b/docker/ci-runner/guest/entrypoint.01-ci-storage-load.sh
@@ -6,6 +6,8 @@ set -u -e
 
 echo "$CI_STORAGE_HOST" > ci-storage-host
 
+# For some reason, the default GitHub Runner's work directory is
+# "$WORK_DIR/{repo-name}/{repo-name}" (i.e. repo-name is repeated twice).
 local_dir=$WORK_DIR/${GH_REPOSITORY##*/}/${GH_REPOSITORY##*/}
 
 mkdir -p "$local_dir"
@@ -18,7 +20,7 @@ if [[ "$CI_STORAGE_HOST" != "" && -f ~/.ssh/id_rsa ]]; then
   say "Running the initial \"ci-storage load\" for $local_dir..."
   ci-storage load \
     --storage-host="$CI_STORAGE_HOST" \
-    --storage-dir="$WORK_DIR/$GH_REPOSITORY/_" \
+    --storage-dir="$WORK_DIR/$GH_REPOSITORY/$(realpath "$local_dir" | tr / _)" \
     --slot-id="*" \
     --local-dir="$local_dir" \
     & export CI_STORAGE_PID=$!