Add explicit sudo option to action.yml (#29)

## PRs in the Stack
- ➡ #29

(The stack is managed by
[git-grok](https://github.com/dimikot/git-grok).)

.github/workflows/ci.yml

@@ -43,6 +43,7 @@ jobs:
         with:
           action: store
           storage-dir: ~/storage-dir
+          sudo: false
       - name: Test store (layer)
         uses: ./
         with:

README.md

@@ -93,6 +93,11 @@ ones, so rsync can run efficiently.
     # Default: empty.
     layer-include: ''
 
+    # If set, uses /usr/bin/ci-storage path and runs it with sudo. Useful for
+    # storing/loading privileged directories like Docker volumes.
+    # Default: false.
+    sudo: ''
+
     # If set, prints the list of transferred files.
     # Default: false.
     verbose: ''

action.yml

@@ -31,6 +31,9 @@ inputs:
   layer-include:
     description: "Newline-separated include pattern(s) for rsync. If set, only the files matching the patterns will be transferred. Implies setting layer-name. Default: empty."
     required: false
+  sudo:
+    description: "If set, uses /usr/bin/ci-storage path and runs it with sudo. Useful for storing/loading privileged directories like Docker volumes. Default: false."
+    required: false
   verbose:
     description: "If set, prints the list of transferred files. Default: false."
     required: false
@@ -56,6 +59,7 @@ runs:
         exclude="${{ inputs.exclude || '' }}"
         layer_name="${{ inputs.layer-name || '' }}"
         layer_include="${{ inputs.layer-include || '' }}"
+        sudo="${{ inputs.sudo || '' }}"
         verbose="${{ inputs.verbose && '--verbose' || '' }}"
 
         if [[ "$storage_host" == "" ]]; then
@@ -97,7 +101,7 @@ runs:
           "$action"
         )
 
-        if [[ -d "$local_dir" && "$(stat -c '%U' "$local_dir")" != "$whoami" ]]; then
+        if [[ "$sudo" == yes || "$sudo" == true || "$sudo" == on || "$sudo" == 1 ]]; then
           sudo /usr/bin/ci-storage "${args[@]}"
         else
           "${{ github.action_path }}/ci-storage" "${args[@]}"