Make viewer accept config files

README.md

@@ -72,6 +72,12 @@ While restic is a fanstastic program, NPBackup expands restic by offering a wide
 
 ## Quickstart
 
+NPBackup consists of four programs:
+- npbackup-cli: CLI version of the backup program
+- npbackup-gui: GUI version of the backup program, useful to create YAML config files
+- npbackup-viewer: View and restore restic repositories without configuration
+- upgrade_server: Separate server to provide npbackup clients with newer binaries
+
 You may install npbackup via PyPI or use the pre-built executables.
 
 ### Prebuilt executables
@@ -144,6 +150,12 @@ This allows a system admin to see repo URI and passwords, without leaving this i
 
 The configuration file should never be world readable, as one could change the backup admin password, allowing to decrypt other parts of the conf file.
 
+### NPBackup viewer
+
+`npbackup-viewer` provides an easy to use GUI to view contents of various restic repositories, and restore files.  
+It accepts npbackup configuration files, restic style `RESTIC_REPOSITORY` and `RESTIC_PASSWORD` environment variables, and can virtually open any restic repository.
+
+
 ## The difficulty of laptop backups
 
 As a matter of fact, laptop backups are the hardest. No one can predict when a laptop is on, and if it has access to internet.

npbackup/gui/__main__.py

@@ -654,7 +654,20 @@ def _main_gui(viewer_mode: bool):
             repo_list,
         )
 
-    if not viewer_mode:
+    # FN ENTRY POINT
+
+    # Let's try to read standard restic repository env variables
+    viewer_repo_uri = os.environ.get("RESTIC_REPOSITORY", None)
+    viewer_repo_password = os.environ.get("RESTIC_PASSWORD", None)
+    if viewer_mode and not config_file:
+        if viewer_repo_uri and viewer_repo_password:
+            repo_config = viewer_create_repo(viewer_repo_uri, viewer_repo_password)
+        else:
+            repo_config = None
+        config_file = None
+        full_config = None
+        backend_type = None
+    else:
         (
             full_config,
             config_file,
@@ -664,17 +677,7 @@ def _main_gui(viewer_mode: bool):
             repo_uri,
             repo_list,
         ) = get_config(config_file=config_file)
-    else:
+
-        # Let's try to read standard restic repository env variables
-        viewer_repo_uri = os.environ.get("RESTIC_REPOSITORY", None)
-        viewer_repo_password = os.environ.get("RESTIC_PASSWORD", None)
-        if viewer_repo_uri and viewer_repo_password:
-            repo_config = viewer_create_repo(viewer_repo_uri, viewer_repo_password)
-        else:
-            repo_config = None
-        config_file = None
-        full_config = None
-        backend_type = None
 
     right_click_menu = ["", [_t("generic.destination")]]
     headings = [