cylc clean 2: remote clean

CHANGES.md

@@ -141,8 +141,10 @@ hierarchy and ability to set site config directory.
 [#3883](https://github.com/cylc/cylc-flow/pull/3883) - Added a new workflow
 config option `[scheduling]stop after cycle point`.
 
-[#3961](https://github.com/cylc/cylc-flow/pull/3961) - Added a new command:
-`cylc clean`.
+[#3961](https://github.com/cylc/cylc-flow/pull/3961),
+[#4017](https://github.com/cylc/cylc-flow/pull/4017) - Added a new command:
+`cylc clean`, for removing stopped workflows on the local and any remote
+filesystems.
 
 [#3913](https://github.com/cylc/cylc-flow/pull/3913) - Added the ability to
 use plugins to parse suite templating variables and additional files to

cylc/flow/cfgspec/globalcfg.py

@@ -548,16 +548,16 @@
                 accepts up to 236 characters.
             ''')
             Conf('install target', VDR.V_STRING, desc='''
-            This defaults to the platform name. This will be used as the
-            target for remote file installation.
-            For example, to indicate to Cylc that Platform_A shares a file
-            system with localhost, we would configure as follows:
+                This defaults to the platform name. This will be used as the
+                target for remote file installation.
+                For example, to indicate to Cylc that Platform_A shares a file
+                system with localhost, we would configure as follows:
 
-            .. code-block:: cylc
+                .. code-block:: cylc
 
-               [platforms]
-                   [[Platform_A]]
-                       install target = localhost
+                   [platforms]
+                       [[Platform_A]]
+                           install target = localhost
             ''')
 
             Conf('clean job submission environment', VDR.V_BOOLEAN, False,

cylc/flow/exceptions.py

@@ -99,18 +99,18 @@ class WorkflowFilesError(CylcError):
 class TaskRemoteMgmtError(CylcError):
     """Exceptions initialising suite run directory of remote job host."""
 
-    MSG_INIT = '%s: initialisation did not complete:\n'  # %s owner_at_host
-    MSG_SELECT = '%s: host selection failed:\n'  # %s host
-    MSG_TIDY = '%s: clean up did not complete:\n'  # %s owner_at_host
+    MSG_INIT = "initialisation did not complete"
+    MSG_SELECT = "host selection failed"
+    MSG_TIDY = "clean up did not complete"
 
     def __str__(self):
         msg, platform_n, cmd_str, ret_code, out, err = self.args
-        ret = (msg + 'COMMAND FAILED (%d): %s\n') % (
-            platform_n, ret_code, cmd_str)
+        ret = (f"{platform_n}: {msg}:\n"
+               f"COMMAND FAILED ({ret_code}): {cmd_str}\n")
         for label, item in ('STDOUT', out), ('STDERR', err):
             if item:
                 for line in item.splitlines(True):  # keep newline chars
-                    ret += 'COMMAND %s: %s' % (label, line)
+                    ret += f"COMMAND {label}: {line}"
         return ret
 
 

cylc/flow/pathutil.py

@@ -116,7 +116,7 @@ def make_suite_run_tree(suite):
     dir_ = os.path.expandvars(get_suite_run_dir(suite))
     for i in range(archlen, -1, -1):  # archlen...0
         if i > 0:
-            dpath = dir_ + '.' + str(i)
+            dpath = f'{dir_}.{i}'
         else:
             dpath = dir_
         if os.path.exists(dpath):
@@ -125,7 +125,7 @@ def make_suite_run_tree(suite):
                 rmtree(dpath)
             else:
                 # roll others over
-                os.rename(dpath, dir_ + '.' + str(i + 1))
+                os.rename(dpath, f'{dir_}.{i + 1}')
     # Create
     for dir_ in (
         get_suite_run_dir(suite),
@@ -138,7 +138,7 @@ def make_suite_run_tree(suite):
         dir_ = os.path.expandvars(dir_)
         if dir_:
             os.makedirs(dir_, exist_ok=True)
-            LOG.debug('%s: directory created', dir_)
+            LOG.debug(f'{dir_}: directory created')
 
 
 def make_localhost_symlinks(suite):

cylc/flow/platforms.py

@@ -426,8 +426,28 @@ def get_install_target_from_platform(platform):
     return platform.get('install target')
 
 
-def is_platform_with_target_in_list(
-        install_target, distinct_platforms_list):
+def get_install_target_to_platforms_map(platform_names):
+    """Get a dictionary of unique install targets and the platforms which use
+    them.
+
+    Return {install_target_1: [platform_1_dict, platform_2_dict, ...], ...}
+
+    Args:
+        platform_names (list): List of platform names to look up in the
+            global config.
+    """
+    platform_names = set(platform_names)
+    platforms = [get_platform(p_name) for p_name in platform_names]
+    install_targets = set(get_install_target_from_platform(platform)
+                          for platform in platforms)
+    return {
+        target: [platform for platform in platforms
+                 if get_install_target_from_platform(platform) == target]
+        for target in install_targets
+    }
+
+
+def is_platform_with_target_in_list(install_target, distinct_platforms_list):
     """Determines whether install target is in the list of platforms"""
     for distinct_platform in distinct_platforms_list:
         return install_target == distinct_platform['install target']

cylc/flow/rundb.py

@@ -297,11 +297,12 @@ class CylcSuiteDAO:
         ],
     }
 
-    def __init__(self, db_file_name=None, is_public=False):
-        """Initialise object.
+    def __init__(self, db_file_name, is_public=False):
+        """Initialise database access object.
 
-        db_file_name - Path to the database file
-        is_public - If True, allow retries, etc
+        Args:
+            db_file_name (str): Path to the database file.
+            is_public (bool): If True, allow retries, etc.
 
         """
         self.db_file_name = expandvars(db_file_name)
@@ -609,6 +610,11 @@ def select_task_job_run_times(self, callback):
         for row_idx, row in enumerate(self.connect().execute(stmt)):
             callback(row_idx, list(row))
 
+    def select_task_job_platforms(self):
+        """Return the set of platform names from task_jobs table."""
+        stmt = f"SELECT DISTINCT platform_name FROM {self.TABLE_TASK_JOBS}"
+        return set(i[0] for i in self.connect().execute(stmt))
+
     def select_submit_nums(self, name, point):
         """Select submit_num and flow_label from task_states table.
 

cylc/flow/scripts/clean.py

@@ -18,39 +18,48 @@
 
 """cylc clean [OPTIONS] ARGS
 
-Remove a stopped workflow from the local scheduler filesystem.
+Remove a stopped workflow from the local scheduler filesystem and remote hosts.
 
 NOTE: this command is intended for workflows installed with `cylc install`. If
 this is run for a workflow that was instead written directly in ~/cylc-run and
 not backed up elsewhere, it will be lost.
 
-It will also remove an symlink directory targets. For now, it will fail to
-remove workflow files/directories on a remote host.
+It will also remove any symlink directory targets.
 
 Suite names can be hierarchical, corresponding to the path under ~/cylc-run.
 
 Examples:
-  # Remove the workflow at ~/cylc-run/foo
-  $ cylc clean foo
+  # Remove the workflow at ~/cylc-run/foo/bar
+  $ cylc clean foo/bar
 
 """
 
 from cylc.flow.option_parsers import CylcOptionParser as COP
 from cylc.flow.terminal import cli_function
-from cylc.flow.suite_files import clean
+from cylc.flow.suite_files import clean, init_clean
 
 
 def get_option_parser():
     parser = COP(
         __doc__,
-        argdoc=[("REG", "Suite name")]
+        argdoc=[('REG', "Workflow name")]
     )
+
+    parser.add_option(
+        '--local-only', '--local',
+        help="Only clean on the local filesystem (not remote hosts).",
+        action='store_true', dest='local_only'
+    )
+
     return parser
 
 
 @cli_function(get_option_parser)
 def main(parser, opts, reg):
-    clean(reg)
+    if opts.local_only:
+        clean(reg)
+    else:
+        init_clean(reg)
 
 
 if __name__ == "__main__":

cylc/flow/suite_db_mgr.py

@@ -557,29 +557,38 @@ def recover_pub_from_pri(self):
 
     def on_restart(self):
         """Check & vacuum the runtime DB on restart."""
-        if not os.path.isfile(self.pri_path):
+        try:
+            self.check_suite_db_compatibility()
+        except FileNotFoundError:
+            raise SuiteServiceFileError(
+                "Cannot restart as the workflow database was not found")
+        except SuiteServiceFileError as exc:
             raise SuiteServiceFileError(
-                'Cannot restart as suite database not found')
-        self.check_suite_db_compatibility()
+                f"Cannot restart - {exc}")
         pri_dao = self.get_pri_dao()
-        pri_dao.vacuum()
-        self.n_restart = pri_dao.select_suite_params_restart_count() + 1
-        self.put_suite_params_1(self.KEY_RESTART_COUNT, self.n_restart)
-        pri_dao.close()
+        try:
+            pri_dao.vacuum()
+            self.n_restart = pri_dao.select_suite_params_restart_count() + 1
+            self.put_suite_params_1(self.KEY_RESTART_COUNT, self.n_restart)
+        finally:
+            pri_dao.close()
 
     def check_suite_db_compatibility(self):
         """Raises SuiteServiceFileError if the existing suite database is
         incompatible with the current version of Cylc."""
+        if not os.path.isfile(self.pri_path):
+            raise FileNotFoundError(self.pri_path)
+        incompat_msg = (
+            f"Workflow database is incompatible with Cylc {CYLC_VERSION}")
         pri_dao = self.get_pri_dao()
         try:
             last_run_ver = pri_dao.connect().execute(
                 f'SELECT value FROM {self.TABLE_SUITE_PARAMS} '
                 f'WHERE key == "{self.KEY_CYLC_VERSION}"').fetchone()[0]
         except TypeError:
-            raise SuiteServiceFileError(
-                'Cannot restart suite as the suite database is incompatible '
-                f'with Cylc {CYLC_VERSION}')
-        pri_dao.close()
+            raise SuiteServiceFileError(incompat_msg)
+        finally:
+            pri_dao.close()
         try:
             last_run_ver = packaging.version.Version(last_run_ver)
         except packaging.version.InvalidVersion:
@@ -588,5 +597,4 @@ def check_suite_db_compatibility(self):
             CylcSuiteDAO.RESTART_INCOMPAT_VERSION)
         if last_run_ver <= restart_incompat_ver:
             raise SuiteServiceFileError(
-                f'Cannot restart suite last run with Cylc {last_run_ver} as '
-                f'the suite database is incompatible with Cylc {CYLC_VERSION}')
+                f"{incompat_msg} (workflow last run with Cylc {last_run_ver})")