Make source optional

We want to make source optional to make the action for example only run
createrepo without actually uploading any files.
This is needed in cases where concurrent uploads can happen, but only a
single createrepo needs to be executed (as createrepo fails when already
running).

Signed-off-by: Jean-Louis Dupond <jean-louis@dupond.be>

Author: dupondje

action.yml

@@ -17,7 +17,7 @@ inputs:
     default: "22"
   source:
     description: 'Files to upload. This parameter allows globbing.'
-    required: true
+    required: false
   target:
     description: 'Target directory on resources.ovirt.org.'
     required: false
@@ -84,7 +84,7 @@ runs:
           exit 128
         fi
         echo -e "\e[32mValidating source...\e[0m"
-        if [ -z "$(ls ${SOURCE})" ]; then
+        if [ -n "${SOURCE}" -a -z "$(ls ${SOURCE})" ]; then
           echo -e "\e[31mThe source you provided matches no files.\e[0m" >&2
           exit 128
         fi
@@ -159,7 +159,7 @@ runs:
         DELETE_BEFORE_UPLOAD: ${{ inputs.delete_before_upload }}
         PORT: ${{ inputs.port }}
         KNOWN_HOSTS: ${{ inputs.known_hosts }}
-      if: inputs.delete_before_upload == 'yes'
+      if: inputs.delete_before_upload == 'yes' && inputs.source != ''
       shell: bash
       run: |
         set -e
@@ -179,6 +179,7 @@ runs:
         SOURCE: ${{ inputs.source }}
         TARGET: ${{ inputs.target }}
         PORT: ${{ inputs.port }}
+      if: inputs.source != ''
       shell: bash
       run: |
         set -e