list: Add command_line to format keys

Backport of #6108

scripts/shell_completions/zsh/_borg

@@ -1129,7 +1129,7 @@ _borg_format_keys() {
   local repo_or_arch=${(Q)1}
 
   local -a keys=( NEWLINE NL NUL SPACE TAB CR LF )
-  local -a repository_keys=( archive name barchive comment bcomment id start time end hostname username )
+  local -a repository_keys=( archive name barchive comment bcomment id start time end command_line hostname username )
   local -a archive_keys=( type mode uid gid user group path bpath source linktarget flags size csize dsize dcsize
     num_chunks unique_chunks mtime ctime atime isomtime isoctime isoatime blake2b blake2s md5 sha1 sha224 sha256 sha384
     sha3_224 sha3_256 sha3_384 sha3_512 sha512 shake_128 shake_256 archiveid archivename extra health )

src/borg/helpers.py

@@ -1795,13 +1795,14 @@ class ArchiveFormatter(BaseFormatter):
         'start': 'time (start) of creation of the archive',
         'time': 'alias of "start"',
         'end': 'time (end) of creation of the archive',
+        'command_line': 'command line which was used to create the archive',
         'id': 'internal ID of the archive',
         'hostname': 'hostname of host on which this archive was created',
         'username': 'username of user who created this archive',
     }
     KEY_GROUPS = (
         ('archive', 'name', 'barchive', 'comment', 'bcomment', 'id'),
-        ('start', 'time', 'end'),
+        ('start', 'time', 'end', 'command_line'),
         ('hostname', 'username'),
     )
 
@@ -1850,6 +1851,7 @@ class ArchiveFormatter(BaseFormatter):
             'comment': partial(self.get_meta, 'comment', rs=True),
             'bcomment': partial(self.get_meta, 'comment', rs=False),
             'end': self.get_ts_end,
+            'command_line': self.get_cmdline,
         }
         self.used_call_keys = set(self.call_keys) & self.format_keys
         if self.json:
@@ -1890,6 +1892,13 @@ class ArchiveFormatter(BaseFormatter):
         value = self.archive.metadata.get(key, '')
         return remove_surrogates(value) if rs else value
 
+    def get_cmdline(self):
+        cmdline = map(remove_surrogates, self.archive.metadata.get('cmdline', []))
+        if self.json:
+            return list(cmdline)
+        else:
+            return ' '.join(map(shlex.quote, cmdline))
+
     def get_ts_end(self):
         return self.format_time(self.archive.ts_end)