A new 'repo_arch' option

This option is used for the cases when $basearch DNF-native variable
doesn't work as expected in URLs.

Mock now also uses the `repo_arch` values for the `man 2 personality`
decisions during the bootstrap chroot initialization, as bootstrap is
is almost always expected to be "host-native".

Closes: rpm-software-management#1317
Fixes: rpm-software-management#1304

mock-core-configs/etc/mock/templates/mageia-branched.tpl

@@ -29,43 +29,43 @@ user_agent={{ user_agent }}
 # repos
 
 [mageia]
-name=Mageia $releasever - {{ target_arch }}
-#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ target_arch }}/media/core/release/
-#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ target_arch }}@&section=core&repo=release
-mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ target_arch }}&section=core&repo=release
+name=Mageia $releasever - {{ repo_arch }}
+#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ repo_arch }}/media/core/release/
+#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ repo_arch }}@&section=core&repo=release
+mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ repo_arch }}&section=core&repo=release
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia
 enabled=1
 skip_if_unavailable=False
 
 [updates]
-name=Mageia $releasever - {{ target_arch }} - Updates
-#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ target_arch }}/media/core/updates/
-#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ target_arch }}@&section=core&repo=updates
-mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ target_arch }}&section=core&repo=updates
+name=Mageia $releasever - {{ repo_arch }} - Updates
+#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ repo_arch }}/media/core/updates/
+#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ repo_arch }}@&section=core&repo=updates
+mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ repo_arch }}&section=core&repo=updates
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia
 enabled=1
 skip_if_unavailable=False
 
 [mageia-debuginfo]
-name=Mageia $releasever - {{ target_arch }} - Debug
-#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ target_arch }}/media/debug/core/release/
-#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ target_arch }}@&section=core&repo=release&debug=true
-mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ target_arch }}&section=core&repo=release&debug=1
+name=Mageia $releasever - {{ repo_arch }} - Debug
+#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ repo_arch }}/media/debug/core/release/
+#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ repo_arch }}@&section=core&repo=release&debug=true
+mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ repo_arch }}&section=core&repo=release&debug=1
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia
 enabled=0
 skip_if_unavailable=False
 
 [updates-debuginfo]
-name=Mageia $releasever - {{ target_arch }} - Updates - Debug
-#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ target_arch }}/media/debug/core/updates/
-#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ target_arch }}@&section=core&repo=updates&debug=true
-mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ target_arch }}&section=core&repo=updates&debug=1
+name=Mageia $releasever - {{ repo_arch }} - Updates - Debug
+#baseurl=http://mirrors.kernel.org/mageia/distrib/$releasever/{{ repo_arch }}/media/debug/core/updates/
+#metalink=https://mirrors.mageia.org/metalink?distrib=mageia-$releasever&arch={{ repo_arch }}@&section=core&repo=updates&debug=true
+mirrorlist=https://www.mageia.org/mirrorlist/?release=$releasever&arch={{ repo_arch }}&section=core&repo=updates&debug=1
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia

mock-core-configs/etc/mock/templates/mageia-cauldron.tpl

@@ -30,21 +30,21 @@ user_agent={{ user_agent }}
 # repos
 
 [mageia-cauldron]
-name=Mageia Cauldron - {{ target_arch }}
-#baseurl=http://mirrors.kernel.org/mageia/distrib/cauldron/{{ target_arch }}/media/core/release/
-#metalink=https://mirrors.mageia.org/metalink?distrib=cauldron&arch={{ target_arch }}@&section=core&repo=release
-mirrorlist=https://www.mageia.org/mirrorlist/?release=cauldron&arch={{ target_arch }}&section=core&repo=release
+name=Mageia Cauldron - {{ repo_arch }}
+#baseurl=http://mirrors.kernel.org/mageia/distrib/cauldron/{{ repo_arch }}/media/core/release/
+#metalink=https://mirrors.mageia.org/metalink?distrib=cauldron&arch={{ repo_arch }}@&section=core&repo=release
+mirrorlist=https://www.mageia.org/mirrorlist/?release=cauldron&arch={{ repo_arch }}&section=core&repo=release
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia
 enabled=1
 skip_if_unavailable=False
 
 [mageia-cauldron-debuginfo]
-name=Mageia Cauldron - {{ target_arch }} - Debug
-#baseurl=http://mirrors.kernel.org/mageia/distrib/cauldron/{{ target_arch }}/media/debug/core/release/
-#metalink=https://mirrors.mageia.org/metalink?distrib=cauldron&arch={{ target_arch }}@&section=core&repo=release&debug=true
-mirrorlist=https://www.mageia.org/mirrorlist/?release=cauldron&arch={{ target_arch }}&section=core&repo=release&debug=1
+name=Mageia Cauldron - {{ repo_arch }} - Debug
+#baseurl=http://mirrors.kernel.org/mageia/distrib/cauldron/{{ repo_arch }}/media/debug/core/release/
+#metalink=https://mirrors.mageia.org/metalink?distrib=cauldron&arch={{ repo_arch }}@&section=core&repo=release&debug=true
+mirrorlist=https://www.mageia.org/mirrorlist/?release=cauldron&arch={{ repo_arch }}&section=core&repo=release&debug=1
 fastestmirror=1
 gpgcheck=1
 gpgkey=file:///usr/share/distribution-gpg-keys/mageia/RPM-GPG-KEY-Mageia

mock/docs/site-defaults.cfg

@@ -663,3 +663,29 @@
 # example, the host is configured to use FreeIPA-provided subids.
 # See https://github.com/shadow-maint/shadow/issues/897
 # config_opts["use_host_shadow_utils"] = True
+
+# The `repo_arch` (read-only) option simplifies DNF configuration with Mock for
+# non-trivial architecture selection decisions.  Typically, we want to use the
+# DNF-native `$basearch` variable to instruct DNF to use the appropriate RPM
+# architecture for a given Mock config (for cross-arch builds, bootstrap uses a
+# different architecture than the target chroot!). However, `$basearch` often
+# doesn't work correctly — some distributions do not align the mirror URLs with
+# the `$basearch` content (as known by DNF), causing problems with
+# cross-distro/cross-architecture builds.  The `repo_arch` internal is then
+# exported as a `{{ repo_arch }}` Jinja2 placeholder, aiming to help with this
+# problem.  Simply replace `$basearch` with `{{ repo_arch }}` in your config.
+#
+# The `repo_arch` thing is not really an "option" but rather a Mock internal
+# exported for read-only use-cases.  However, the `repo_arch_map` dictionary
+# can be used to affect Mock's background decisions.  For example, when
+# the configuration claims `target_arch=armv7hnl`, but the repo URLs look like
+# 'example.com/arm32/', one can use
+#       `baseurl=example.com/{{ repo_arch }}/` instead of
+#       `baseurl=example.com/$basearch/`, together with
+#       `config_opts["repo_arch_map"] = {"armv7hnl": "arm32"}`.
+# In such a case, builds on `x86_64` hosts will expand to `example.com/x86_64`
+# URL for the bootstrap (native) chroot installation, but also to
+# `example.com/arm32` for the target (cross-arch, emulated) chroot
+# installation.
+#config_opts["repo_arch"] = "Mock internal, e.g. 'x86_64'"
+#config_opts["repo_arch_map"] = {}

mock/py/mock.py

@@ -739,6 +739,22 @@ def main():
         # disable updating bootstrap chroot
         bootstrap_buildroot_config['update_before_build'] = False
 
+        # Enforce host-native repo architecture for bootstrap chroot (unless
+        # bootstrap_forcearch=True, which should never be the case).  This
+        # decision affects condPersonality() for DNF calls!
+        host_arch = config_opts["host_arch"]
+        if config_opts["use_bootstrap_image"]:
+            # with bootstrap image, bootstrap is always native
+            bootstrap_buildroot_config['repo_arch'] = config_opts['repo_arch_map'].get(host_arch, host_arch)
+        elif host_arch not in config_opts.get("legal_host_arches", []) \
+                and not config_opts.get('bootstrap_forcearch'):
+            # target chroot uses --forcearch, but bootstrap is native
+            bootstrap_buildroot_config['repo_arch'] = config_opts['repo_arch_map'].get(host_arch, host_arch)
+        # else:
+        # We keep the 'repo_arch' copied from target chroot (config_opts['repo_arch']):
+        # - for the 'multilib' cases (we don't want to use x86_64 repos for i586 chroots)
+        # - 'bootstrap_forcearch' is set
+
         # disable forcearch in bootstrap, per https://github.com/rpm-software-management/mock/issues/1110
         bootstrap_buildroot_config['forcearch'] = None
 

mock/py/mockbuild/config.py

@@ -255,6 +255,8 @@ def setup_default_config_opts():
     # dependent on guest OS
     config_opts['use_host_resolv'] = False
     config_opts['chroot_setup_cmd'] = ('groupinstall', 'buildsys-build')
+    config_opts['repo_arch'] = None
+    config_opts['repo_arch_map'] = {}
     config_opts['target_arch'] = 'i386'
     config_opts['releasever'] = None
     config_opts['rpmbuild_arch'] = None  # <-- None means set automatically from target_arch
@@ -432,6 +434,10 @@ def set_config_opts_per_cmdline(config_opts, options, args):
     if options.forcearch:
         config_opts['forcearch'] = options.forcearch
 
+    if not config_opts['repo_arch']:
+        target = config_opts['target_arch']
+        config_opts['repo_arch'] = config_opts['repo_arch_map'].get(target, target)
+
     if not options.clean:
         config_opts['clean'] = options.clean
 

mock/py/mockbuild/package_manager.py

@@ -307,30 +307,24 @@ def _execute_mounted(self, *args, **kwargs):
             try:
                 # either it does not support --installroot (microdnf) or
                 # it is bootstrap image made by container with incomaptible dnf/rpm
-                if not self.support_installroot or self.is_bootstrap_image:
-
-                    personality = kwargs.pop("personality", None)
-                    if self.is_bootstrap_image:
-                        # Multilib fix, see on an example: The host-native
-                        # 64-bit package manager installed in the bootstrap
-                        # chroot (from image) needs to know how to resolve the
-                        # $basearch variable.  It would be confused our previous
-                        # 'condPersonality("i386")' call (switched to 32-bit).
-                        # Switch back to 64-bit mode (only the particular DNF
-                        # sub-process).
-                        personality = self.config['host_arch']
+                personality = kwargs.pop("personality", None)
+                if self.buildroot.is_bootstrap and not self.buildroot.config["forcearch"]:
+                    personality = self.buildroot.config["repo_arch"]
 
+                if not self.support_installroot or self.is_bootstrap_image:
                     out = util.do(invocation, env=env,
                                   chrootPath=self.buildroot.make_chroot_path(),
                                   personality=personality, **kwargs)
                 elif self.bootstrap_buildroot is None:
+
+
                     out = util.do(invocation, env=env,
-                                  **kwargs)
+                                  personality=personality, **kwargs)
                 else:
                     out = util.do(invocation, env=env,
                                   chrootPath=self.bootstrap_buildroot.make_chroot_path(),
                                   nspawn_args=self.bootstrap_buildroot.config['nspawn_args'],
-                                  **kwargs)
+                                  personality=personality, **kwargs)
                 error = None
                 break
             except Error as e:

mock/tests/test_config_templates.py

@@ -12,6 +12,31 @@ def test_transitive_expand():
     assert config['c'] == 'test test test test'
 
 
+@pytest.mark.parametrize('setup', [
+    # host target bootstrap expected_repo
+    ('x86_64', 'arm7hl', True, 'x86_64'),
+    ('x86_64', 'arm7hl', False, 'armhfp'),
+    ('ppc64le', 'arm7hl', True, 'ppc64le'),
+    ('ppc64le', 'arm7hl', False, 'armhfp'),
+])
+def test_nested_access(setup):
+    """
+    Check that we can access config_opts["foo"]["bar"] items in jinja.
+    """
+    host, target, bootstrap, result = setup
+    config = TemplatedDictionary()
+    config["archmap"] = {"i386": "i686", "arm7hl": "armhfp", "x86_64": "x86_64"}
+    config["host_arch"] = host
+    config["target_arch"] = target
+    config["root"] = "foo-bootstrap" if bootstrap else "foo"
+    config["repo_arch"] = (
+        "{% set desired = host_arch if root.endswith('bootstrap') else target_arch %}"
+        "{{ archmap[desired] if desired in archmap else desired }}"
+    )
+    config['__jinja_expand'] = True
+    assert config['repo_arch'] == result
+
+
 def test_aliases():
     config = TemplatedDictionary(
         alias_spec={

releng/release-notes-next/repo-arch.feature

@@ -0,0 +1,6 @@
+A new `{{ repo_arch }}` Jinja2 template (templated-dictionary) is provided
+by Mock.  This variable is usable for DNF config options denoting URLs like
+`baseurl=`, `metalink=`, etc.  Namely, it can be used instead of the DNF-native
+`$basearch` variable which [doesn't work properly for all the
+distributions][issue#1304].  The new `config_opts['repo_arch_map']` option has
+been added too, if additional tweaks with `repo_arch` template need to be done.