cmdeploy: run SSH commands locally if ssh_host is localhost

- Before proceeding with installation of Python dependencies, check
  whether the 'gcc' command is available by running it with the
  --version argument.  If it is not available, print a helpful message
  and exit.
- For the current set of Python dependencies, without GCC, the build
  process fails when building the crypt-r package.  According to the
  error message, on my system the exact command it tries to run is
  'x86_64-linux-gnu-gcc', but rather than depend on this variant
  specifically, the script checks for the generic 'gcc' command, so as
  to avoid coupling the check to an architecture or operating system.
  Similar problems arise if we attempt to check for packages by name;
  the compiler binary is provided by 'gcc-11', but the symlinks that
  provide the unversioned commands (as used by the Python build) come
  from a package named 'gcc'.  Trying to be too precise in what we
  check for could lead to unnecessary failures in some environments,
  or become a maintenance challenge in the future.  For that reason,
  this change simply attempts to run 'gcc' and uses that as a
  probably-sufficient proxy for having what the Python package install
  will need.

CHANGELOG.md

@@ -2,6 +2,9 @@
 
 ## untagged
 
+- Check whether GCC is installed in initenv.sh
+  ([#608](https://github.com/chatmail/relay/pull/608))
+
 - Expire push notification tokens after 90 days
   ([#583](https://github.com/chatmail/relay/pull/583))
 

cmdeploy/src/cmdeploy/__init__.py

@@ -321,14 +321,14 @@ def _configure_postfix(config: Config, debug: bool = False) -> bool:
 def _install_dovecot_package(package: str, arch: str):
     arch = "amd64" if arch == "x86_64" else arch
     arch = "arm64" if arch == "aarch64" else arch
-    url = f"https://download.delta.chat/dovecot/staging-drop-libicu/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
+    url = f"https://download.delta.chat/dovecot/dovecot-{package}_2.3.21%2Bdfsg1-3_{arch}.deb"
     deb_filename = "/root/" + url.split("/")[-1]
 
     match (package, arch):
         case ("core", "amd64"):
-            sha256 = "dd060706f52a306fa863d874717210b9fe10536c824afe1790eec247ded5b27d"
+            sha256 = "43f593332e22ac7701c62d58b575d2ca409e0f64857a2803be886c22860f5587"
         case ("core", "arm64"):
-            sha256 = "e7548e8a82929722e973629ecc40fcfa886894cef3db88f23535149e7f730dc9"
+            sha256 = "4d21eba1a83f51c100f08f2e49f0c9f8f52f721ebc34f75018e043306da993a7"
         case ("imapd", "amd64"):
             sha256 = "8d8dc6fc00bbb6cdb25d345844f41ce2f1c53f764b79a838eb2a03103eebfa86"
         case ("imapd", "arm64"):
@@ -816,8 +816,14 @@ def deploy_chatmail(config_path: Path, disable_mail: bool) -> None:
         name="Ensure cron is installed",
         packages=["cron"],
     )
-    git_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode()
-    git_diff = subprocess.check_output(["git", "diff"]).decode()
+    try:
+        git_hash = subprocess.check_output(["git", "rev-parse", "HEAD"]).decode()
+    except Exception:
+        git_hash = "unknown\n"
+    try:
+        git_diff = subprocess.check_output(["git", "diff"]).decode()
+    except Exception:
+        git_diff = ""
     files.put(
         name="Upload chatmail relay git commiit hash",
         src=StringIO(git_hash + git_diff),

cmdeploy/src/cmdeploy/cmdeploy.py

@@ -19,7 +19,7 @@ from packaging import version
 from termcolor import colored
 
 from . import dns, remote
-from .sshexec import SSHExec
+from .sshexec import SSHExec, Local
 
 #
 # cmdeploy sub commands and options
@@ -62,13 +62,18 @@ def run_cmd_options(parser):
         "--ssh-host",
         dest="ssh_host",
         help="specify an SSH host to deploy to; uses mail_domain from chatmail.ini by default",
+        default=None,
     )
 
 
 def run_cmd(args, out):
     """Deploy chatmail services on the remote server."""
 
-    sshexec = args.get_sshexec()
+    ssh_host = args.ssh_host if args.ssh_host else args.config.mail_domain
+    if ssh_host == "localhost":
+        sshexec = Local(ssh_host)
+    else:
+        sshexec = args.get_sshexec(ssh_host)
     require_iroh = args.config.enable_iroh_relay
     remote_data = dns.get_initial_remote_data(sshexec, args.config.mail_domain)
     if not dns.check_initial_remote_data(remote_data, print=out.red):
@@ -80,7 +85,7 @@ def run_cmd(args, out):
     env["CHATMAIL_REQUIRE_IROH"] = "True" if require_iroh else ""
     deploy_path = importlib.resources.files(__package__).joinpath("deploy.py").resolve()
     pyinf = "pyinfra --dry" if args.dry_run else "pyinfra"
-    ssh_host = args.config.mail_domain if not args.ssh_host else args.ssh_host
+    ssh_host = "@local" if ssh_host == "localhost" else f"--ssh-host {ssh_host}"
     cmd = f"{pyinf} --ssh-user root {ssh_host} {deploy_path} -y"
     if version.parse(pyinfra.__version__) < version.parse("3"):
         out.red("Please re-run scripts/initenv.sh to update pyinfra to version 3.")
@@ -330,9 +335,9 @@ def main(args=None):
     if not hasattr(args, "func"):
         return parser.parse_args(["-h"])
 
-    def get_sshexec():
-        print(f"[ssh] login to {args.config.mail_domain}")
-        return SSHExec(args.config.mail_domain, verbose=args.verbose)
+    def get_sshexec(host):
+        print(f"[ssh] login to {host}")
+        return SSHExec(host, verbose=args.verbose)
 
     args.get_sshexec = get_sshexec
 

cmdeploy/src/cmdeploy/sshexec.py

@@ -1,5 +1,6 @@
 import inspect
 import os
+import subprocess
 import sys
 from queue import Queue
 
@@ -44,30 +45,16 @@ def print_stderr(item="", end="\n"):
     print(item, file=sys.stderr, end=end)
 
 
-class SSHExec:
-    RemoteError = execnet.RemoteError
+class Exec:
     FuncError = FuncError
 
-    def __init__(self, host, verbose=False, python="python3", timeout=60):
-        self.gateway = execnet.makegateway(f"ssh=root@{host}//python={python}")
-        self._remote_cmdloop_channel = bootstrap_remote(self.gateway, remote)
+    def __init__(self, host, verbose, timeout):
+        self.host = host
         self.timeout = timeout
         self.verbose = verbose
 
     def __call__(self, call, kwargs=None, log_callback=None):
-        if kwargs is None:
-            kwargs = {}
-        assert call.__module__.startswith("cmdeploy.remote")
-        modname = call.__module__.replace("cmdeploy.", "")
-        self._remote_cmdloop_channel.send((modname, call.__name__, kwargs))
-        while 1:
-            code, data = self._remote_cmdloop_channel.receive(timeout=self.timeout)
-            if log_callback is not None and code == "log":
-                log_callback(data)
-            elif code == "finish":
-                return data
-            elif code == "error":
-                raise self.FuncError(data)
+        return subprocess.check_output(call)
 
     def logged(self, call, kwargs):
         def log_progress(data):
@@ -85,3 +72,33 @@ class SSHExec:
             res = self(call, kwargs, log_callback=log_progress)
             print_stderr()
             return res
+
+
+class Local(Exec):
+
+    def __init__(self, host, verbose=False, timeout=60):
+        super().__init__(host, verbose, timeout)
+
+
+class SSHExec(Exec):
+    RemoteError = execnet.RemoteError
+
+    def __init__(self, host, verbose=False, timeout=60):
+        super().__init__(host, verbose, timeout)
+        self.gateway = execnet.makegateway(f"ssh=root@{host}//python=python3")
+        self._remote_cmdloop_channel = bootstrap_remote(self.gateway, remote)
+
+    def __call__(self, call, kwargs=None, log_callback=None):
+        if kwargs is None:
+            kwargs = {}
+        assert call.__module__.startswith("cmdeploy.remote")
+        modname = call.__module__.replace("cmdeploy.", "")
+        self._remote_cmdloop_channel.send((modname, call.__name__, kwargs))
+        while 1:
+            code, data = self._remote_cmdloop_channel.receive(timeout=self.timeout)
+            if log_callback is not None and code == "log":
+                log_callback(data)
+            elif code == "finish":
+                return data
+            elif code == "error":
+                raise self.FuncError(data)

scripts/initenv.sh

@@ -9,6 +9,11 @@ if command -v lsb_release 2>&1 >/dev/null; then
         echo "You need to install python3-dev for installing the other dependencies."
         exit 1
       fi
+      if ! gcc --version 2>&1 >/dev/null
+      then
+        echo "You need to install gcc for building Python dependencies."
+        exit 1
+      fi
       ;;
   esac
 fi