Add support for --paths-from-command to extra borg arguments. (#1538)

Backups will run although no sources are specified if `--paths-from-command` is supplied.
Also arguments after `--` will be appended to the end of the command after all other arguments.
Closes #1537.

* src/vorta/borg/create.py

* tests/test_create.py : Add test for using `--path-from-commands`.

Co-authored-by: real-yfprojects <real-yfprojects@users.noreply.github.com>

src/vorta/borg/create.py

@@ -77,7 +77,18 @@ class BorgCreateJob(BorgJob):
             ret['ok'] = False  # Set back to False, so we can do our own checks here.
 
         n_backup_folders = SourceFileModel.select().count()
-        if n_backup_folders == 0:
+
+        # cmd options like `--paths-from-command` require a command
+        # that is appended to the arguments
+        # $ borg create --paths-from-command repo::archive1 -- find /home/user -type f -size -76M
+        extra_cmd_options = []
+        suffix_command = []
+        if profile.repo.create_backup_cmd:
+            s1, sep, s2 = profile.repo.create_backup_cmd.partition('-- ')
+            extra_cmd_options = s1.split()
+            suffix_command = (sep + s2).split()
+
+        if n_backup_folders == 0 and '--paths-from-command' not in extra_cmd_options:
             ret['message'] = trans_late('messages', 'Add some folders to back up first.')
             return ret
 
@@ -132,9 +143,7 @@ class BorgCreateJob(BorgJob):
             '-C',
             profile.compression,
         ]
-
-        if profile.repo.create_backup_cmd:
-            cmd.extend(profile.repo.create_backup_cmd.split(' '))
+        cmd += extra_cmd_options
 
         # Add excludes
         # Partly inspired by borgmatic/borgmatic/borg/create.py
@@ -164,6 +173,8 @@ class BorgCreateJob(BorgJob):
         for f in SourceFileModel.select().where(SourceFileModel.profile == profile.id):
             cmd.append(f.dir)
 
+        cmd += suffix_command
+
         ret['message'] = trans_late('messages', 'Starting backup…')
         ret['ok'] = True
         ret['cmd'] = cmd

tests/test_create.py

@@ -0,0 +1,51 @@
+from vorta.borg.create import BorgCreateJob
+from vorta.store.models import BackupProfileModel, SourceFileModel
+
+
+def test_create_paths_from_command():
+    default_profile = BackupProfileModel.get()
+    default_profile.new_archive_name = 'a1'
+
+    default_profile.repo.create_backup_cmd = '--one-file-system'
+    result = BorgCreateJob.prepare(default_profile)
+
+    assert 'cmd' in result
+    assert result['cmd'] == [
+        'borg',
+        'create',
+        '--list',
+        '--progress',
+        '--info',
+        '--log-json',
+        '--json',
+        '--filter=AM',
+        '-C',
+        'lz4',
+        '--one-file-system',
+        'i0fi93@i593.repo.borgbase.com:repo::a1',
+        '/tmp/another',
+    ]
+
+    default_profile.repo.create_backup_cmd = '--paths-from-command -- echo /tmp/another'
+    SourceFileModel.delete().execute()
+
+    result = BorgCreateJob.prepare(default_profile)
+
+    assert 'cmd' in result
+    assert result['cmd'] == [
+        'borg',
+        'create',
+        '--list',
+        '--progress',
+        '--info',
+        '--log-json',
+        '--json',
+        '--filter=AM',
+        '-C',
+        'lz4',
+        '--paths-from-command',
+        'i0fi93@i593.repo.borgbase.com:repo::a1',
+        '--',
+        'echo',
+        '/tmp/another',
+    ]