cmdeploy: prepare for being able to run commands in docker containers

cmdeploy/src/cmdeploy/cmdeploy.py

@@ -99,7 +99,7 @@ def run_cmd(args, out):
     pyinf = "pyinfra --dry" if args.dry_run else "pyinfra"
 
     cmd = f"{pyinf} --ssh-user root {ssh_host} {deploy_path} -y"
-    if ssh_host == "localhost":
+    if ssh_host in ["localhost", "docker"]:
         cmd = f"{pyinf} @local {deploy_path} -y"
 
     if version.parse(pyinfra.__version__) < version.parse("3"):
@@ -303,7 +303,7 @@ def add_ssh_host_option(parser):
     parser.add_argument(
         "--ssh-host",
         dest="ssh_host",
-        help="Run commands on 'localhost' or a specific SSH host "
+        help="Run commands on 'localhost', via '@docker', or on a specific SSH host "
              "instead of chatmail.ini's mail_domain.",
     )
 
@@ -366,6 +366,8 @@ def get_parser():
 def get_sshexec(ssh_host: str, verbose=True):
     if ssh_host in ["localhost", "@local"]:
         return "localhost"
+    elif ssh_host == "docker":
+        return "docker"
     if verbose:
         print(f"[ssh] login to {ssh_host}")
     return SSHExec(ssh_host, verbose=verbose)

cmdeploy/src/cmdeploy/dns.py

@@ -9,6 +9,8 @@ from . import remote
 def get_initial_remote_data(sshexec, mail_domain):
     if sshexec == "localhost":
         result = remote.rdns.perform_initial_checks(mail_domain)
+    elif sshexec == "docker":
+        result = remote.rdns.perform_initial_checks(mail_domain, pre_command="docker exec chatmail ")
     else:
         result = sshexec.logged(
             call=remote.rdns.perform_initial_checks, kwargs=dict(mail_domain=mail_domain)
@@ -48,7 +50,7 @@ def check_full_zone(sshexec, remote_data, out, zonefile) -> int:
     """Check existing DNS records, optionally write them to zone file
     and return (exitcode, remote_data) tuple."""
 
-    if sshexec == "localhost":
+    if sshexec in ["localhost", "docker"]:
         required_diff, recommended_diff = remote.rdns.check_zonefile(
             zonefile=zonefile, verbose=False
         )