fix(installer): derive the wireless regdom by pattern and retire two inert hooks

The regulatory domain came from a fixed offset, "${current_lang:3:2}", which is right only for a two-letter language code. validate_config accepts three-letter languages and glibc ships 75 of them, so ber_DZ.UTF-8 yielded "_D" and C yielded "". A garbage region matches no line in the regdom file, sed exits 0, and the || error_warn could never fire, so WiFi sat on the conservative "00" domain in silence.

locale_country matches the _CC group instead of counting characters, and set_wireless_regdom verifies the substitution actually landed. That second half is the part worth keeping: every sed -i in this installer shares the stance that a no-match is indistinguishable from success, and this is the one where the silence costs something.

switch_udev_hook_to_systemd now rewrites keymap and consolefont to sd-vconsole when it performs the swap. Both are busybox-only run_hook scripts, so a systemd initramfs installs them and never runs them, and this machine's own HOOKS line carries all three today. Cosmetic on a box that just boots, and not cosmetic on one asking for a passphrase with a non-US layout, which is exactly what sd-vconsole restores. The two collapse into one entry and an existing sd-vconsole is not duplicated.

Before building it I answered the question the task left open. This machine is KEYMAP=us with no encrypt hook, so no prompt, but the function runs on LUKS machines where there is one, and sd-vconsole ships with mkinitcpio.

364 unit tests, exit 0. Adds tests/installer-steps/test_wireless_regdom.py (16) and 7 sd-vconsole cases. Every guard proven by deleting it, including one whose first version passed with the guard gone because a later check caught the same case.

1 files changed, 51 insertions, 0 deletions

diff --git a/tests/installer-steps/test_switch_udev_hook.py b/tests/installer-steps/test_switch_udev_hook.py
index 54969e6..f6d1dc2 100644
--- a/tests/installer-steps/test_switch_udev_hook.py
+++ b/tests/installer-steps/test_switch_udev_hook.py
@@ -108,6 +108,57 @@ class SwitchUdevHookToSystemd(unittest.TestCase):
         self.assertEqual(rc_of(r), 1)
         self.assertNotIn("BACKUP:", r.stdout, "a declined swap must not touch the file")
 
+    def test_keymap_and_consolefont_become_sd_vconsole(self):
+        """Both are busybox-only run_hook scripts, so a systemd initramfs
+        installs them and never executes them. sd-vconsole is the systemd
+        equivalent, and it ships with mkinitcpio. Without this the early console
+        keeps the default font and keymap until systemd-vconsole-setup runs in
+        the real root -- cosmetic on a machine that just boots, and not cosmetic
+        at all on one that asks for a passphrase with a non-US layout."""
+        r = run("HOOKS=(base udev keymap consolefont block filesystems fsck)\n")
+        conf = r.stdout.split("CONF:[")[1]
+        self.assertIn("sd-vconsole", conf)
+        self.assertNotIn("keymap", conf)
+        self.assertNotIn("consolefont", conf)
+        self.assertEqual(rc_of(r), 0)
+
+    def test_keymap_alone_becomes_sd_vconsole(self):
+        r = run("HOOKS=(base udev keymap block filesystems)\n")
+        conf = r.stdout.split("CONF:[")[1]
+        self.assertIn("sd-vconsole", conf)
+        self.assertNotIn("keymap", conf)
+
+    def test_consolefont_alone_becomes_sd_vconsole(self):
+        r = run("HOOKS=(base udev consolefont block filesystems)\n")
+        conf = r.stdout.split("CONF:[")[1]
+        self.assertIn("sd-vconsole", conf)
+        self.assertNotIn("consolefont", conf)
+
+    def test_the_two_collapse_into_one_sd_vconsole(self):
+        r = run("HOOKS=(base udev keymap block consolefont filesystems)\n")
+        conf = r.stdout.split("CONF:[")[1].split("]")[0]
+        self.assertEqual(conf.count("sd-vconsole"), 1)
+
+    def test_an_existing_sd_vconsole_is_not_duplicated(self):
+        r = run("HOOKS=(base udev sd-vconsole keymap block filesystems)\n")
+        conf = r.stdout.split("CONF:[")[1].split("]")[0]
+        self.assertEqual(conf.count("sd-vconsole"), 1)
+        self.assertNotIn("keymap", conf)
+
+    def test_a_conf_with_neither_hook_is_unchanged_apart_from_the_swap(self):
+        r = run("HOOKS=(base udev block filesystems fsck)\n")
+        conf = r.stdout.split("CONF:[")[1]
+        self.assertNotIn("sd-vconsole", conf)
+        self.assertIn("systemd", conf)
+
+    def test_a_refused_swap_leaves_keymap_alone(self):
+        # No swap means busybox init still runs, and keymap still works there.
+        r = run("HOOKS=(base udev keymap encrypt filesystems)\n")
+        conf = r.stdout.split("CONF:[")[1]
+        self.assertIn("keymap", conf)
+        self.assertNotIn("sd-vconsole", conf)
+        self.assertEqual(rc_of(r), 1)
+
     def test_tab_separated_encrypt_hook_blocks_the_swap(self):
         # The token class was [( ] / [ )], which is a literal space and does
         # not include a tab. mkinitcpio's HOOKS is a bash array literal, and