Respect nspawn_args whenever doChroot is called

This also includes all `doOutChroot()` calls, as that method internally
calls `doChroot()`.

The issue was identified when trying to work around a problem [1] where
the SELinux policy prevented `systemd-machined` from creating a varlink
socket, causing it to fail to start.  As a result, `systemd-nspawn`
could not register the machine.  Tomáš tried the following
configuration:

    config_opts['nspawn_args'] = ['--register=no']

This was intended to ensure that `systemd-nspawn` does not attempt to
register the machine with `systemd-machined`.  However, the
configuration had no effect (the argument was not visible in the
`systemd-nspawn` command line, and the original issue persisted).

[1] https://issues.redhat.com/browse/RHEL-49567

Co-authored-by: Tomáš Hozza <[email protected]>
Closes: rpm-software-management#1410
Closes: rpm-software-management#1456

mock/py/mockbuild/backend.py

@@ -65,12 +65,6 @@ def __init__(self, config, uid_manager, plugins, state, buildroot, bootstrap_bui
         self.private_network = not config['rpmbuild_networking']
         self.rpmbuild_noclean_option = None
 
-    def _get_nspawn_args(self):
-        nspawn_args = []
-        if util.USE_NSPAWN:
-            nspawn_args.extend(self.config['nspawn_args'])
-        return nspawn_args
-
     @traceLog()
     def backup_results(self):
         srcdir = os.path.join(self.buildroot.basedir, "result")
@@ -370,7 +364,7 @@ def shell(self, options, cmd=None):
             ret = util.doshell(chrootPath=self.buildroot.make_chroot_path(),
                                environ=self.buildroot.env, uid=uid, gid=gid,
                                cwd=cwd,
-                               nspawn_args=self._get_nspawn_args(),
+                               nspawn_args=self.config.get("nspawn_args", []),
                                unshare_net=self.private_network,
                                cmd=cmd)
         finally:
@@ -400,11 +394,10 @@ def chroot(self, args, options):
                 result = self.buildroot.doChroot(args, shell=shell, printOutput=True,
                                                  uid=self.buildroot.chrootuid, gid=self.buildroot.chrootgid,
                                                  user=self.buildroot.chrootuser, cwd=options.cwd,
-                                                 nspawn_args=self._get_nspawn_args(), raiseExc=False,
+                                                 raiseExc=False,
                                                  unshare_net=self.private_network)[1]
             else:
                 result = self.buildroot.doChroot(args, shell=shell, cwd=options.cwd,
-                                                 nspawn_args=self._get_nspawn_args(),
                                                  unshare_net=self.private_network,
                                                  printOutput=True, raiseExc=False)[1]
         finally:
@@ -644,7 +637,6 @@ def copy_spec_into_chroot(self, spec_path):
     def get_specfile_name(self, srpm_path):
         files = self.buildroot.doChroot([self.config['rpm_command'], "-qpl", srpm_path],
                                         shell=False, uid=self.buildroot.chrootuid, gid=self.buildroot.chrootgid,
-                                        nspawn_args=self._get_nspawn_args(),
                                         unshare_net=self.private_network,
                                         user=self.buildroot.chrootuser,
                                         returnOutput=True
@@ -661,7 +653,6 @@ def install_srpm(self, srpm_path):
         output, return_code = self.buildroot.doChroot(
             command, shell=False, uid=self.buildroot.chrootuid,
             gid=self.buildroot.chrootgid, user=self.buildroot.chrootuser,
-            nspawn_args=self._get_nspawn_args(),
             unshare_net=self.private_network, returnOutput=True,
             returnStderr=True, raiseExc=False)
         if return_code:
@@ -704,7 +695,6 @@ def rebuild_installed_srpm(self, spec_path, timeout):
             shell=False, logger=self.buildroot.build_log, timeout=timeout,
             uid=self.buildroot.chrootuid, gid=self.buildroot.chrootgid,
             user=self.buildroot.chrootuser,
-            nspawn_args=self._get_nspawn_args(),
             unshare_net=self.private_network,
             printOutput=self.config['print_main_output']
         )
@@ -766,7 +756,6 @@ def get_command(mode, checkdeps=False):
                                             shell=False, logger=self.buildroot.build_log, timeout=timeout,
                                             uid=self.buildroot.chrootuid, gid=self.buildroot.chrootgid,
                                             user=self.buildroot.chrootuser,
-                                            nspawn_args=self._get_nspawn_args(),
                                             unshare_net=self.private_network, raiseExc=False,
                                             printOutput=self.config['print_main_output'])
                 if returncode > 0 and returncode != 11:
@@ -816,7 +805,6 @@ def get_command(mode, checkdeps=False):
                                     shell=False, logger=self.buildroot.build_log, timeout=timeout,
                                     uid=self.buildroot.chrootuid, gid=self.buildroot.chrootgid,
                                     user=self.buildroot.chrootuser,
-                                    nspawn_args=self._get_nspawn_args(),
                                     unshare_net=self.private_network,
                                     printOutput=self.config['print_main_output'])
         results = glob.glob(bd_out + '/RPMS/*.rpm')

mock/py/mockbuild/buildroot.py

@@ -389,9 +389,16 @@ def doOutChroot(self, command, *args, **kwargs):
         Execute the command in bootstrap chroot (when bootstrap is enabled) or
         on host.  Return (output, exit_status) tuple.
         """
+
+        # the chrootPath would imply running chroot within containers, as well
+        # as on host (where we would have to setup nspawn_args, which is not
+        # implemented).
+        assert "chrootPath" not in kwargs
+
         if self.bootstrap_buildroot:
             with self.mounts.buildroot_in_bootstrap_mounted():
-                return self.bootstrap_buildroot.doChroot(command, *args, **kwargs)
+                return self.bootstrap_buildroot.doChroot(
+                    command, *args, **kwargs)
 
         return util.do_with_status(command, *args, **kwargs)
 
@@ -408,6 +415,9 @@ def doChroot(self, command, nosync=False, *args, **kargs):
                 kargs['gid'] = uid.getresgid()[1]
             self.uid_manager.becomeUser(0, 0)
 
+        kargs.setdefault("nspawn_args", [])
+        kargs["nspawn_args"].extend(self.config.get("nspawn_args", []))
+
         try:
             result = util.do_with_status(command, chrootPath=self.make_chroot_path(),
                                          env=env, *args, **kargs)

mock/py/mockbuild/plugins/rpkg_preprocessor.py

@@ -117,6 +117,5 @@ def _preprocess(self, host_chroot_spec, host_chroot_sources):
             gid=self.buildroot.chrootgid,
             user=self.buildroot.chrootuser,
             unshare_net=private_network,
-            nspawn_args=self.config.get('nspawn_args', []),
             printOutput=self.config.get('print_main_output', True)
         )

mock/py/mockbuild/plugins/rpmautospec.py

@@ -123,6 +123,5 @@ def attempt_process_distgit(
             gid=self.buildroot.chrootgid,
             user=self.buildroot.chrootuser,
             unshare_net=not self.config.get("rpmbuild_networking", False),
-            nspawn_args=self.config.get("nspawn_args", []),
             printOutput=self.config.get("print_main_output", True),
         )

mock/tests/plugins/test_rpmautospec.py

@@ -167,7 +167,6 @@ def test_attempt_process_distgit(
                 gid=plugin.buildroot.chrootgid,
                 user=plugin.buildroot.chrootuser,
                 unshare_net=not plugin.config.get("rpmbuild_networking", False),
-                nspawn_args=plugin.config.get("nspawn_args", []),
                 printOutput=plugin.config.get("print_main_output", True),
             )
         else:

releng/release-notes-next/nspawn-args-chroot-bootstrap.bugfix

@@ -0,0 +1,5 @@
+Previously, the `nspawn_args` configuration value was not applied in multiple
+internal `doChroot()` calls.  This could cause issues when custom nspawn
+arguments were needed everywhere (see [PR#1410][]).  Now, `doChroot()`
+automatically applies `nspawn_args`, shifting the responsibility from callers to
+callee.