archlinux: Replace platform.machine() check with args.architecture check

Test args.architecture instead when selecting the mirror.archlinuxarm.org .
The args.architecture will default to "aarch64" if running on a aarch64
machine and respect command line --architecture switch as well. This is
necessary in case the mkosi is generating foreign architecture container
(e.g. mkosi on amd64 generates arm64 container).

Fix Architecture parameter passed into pacman.conf to permit generation
of foreign architecture containers.

The test on debian/sid amd64 used to generate archlinuxarm aarch64
container looks something like this:
1) Setup pacman
```
$ pacman-key --init
```
- Download http://mirror.archlinuxarm.org/aarch64/core/archlinuxarm-keyring-20140119-2-any.pkg.tar.xz
- Verify the download
- Extract keys into /usr/share/keyrings
```
$ pacman-key --populate
$ pacman-key --populate archlinuxarm
$ pacman-key --refresh-keys
```
2) Run `mkosi --architecture aarch64 ...`

diff --git a/mkosi/__init__.py b/mkosi/__init__.py
index b97b546ca4f47f1784f7196e742c3b8cd90ecd24..323cf922062aea7be8d20f89afaaad206697ba49 100644 (file)
--- a/mkosi/__init__.py
+++ b/mkosi/__init__.py
@@ -2708,7 +2708,7 @@ def install_arch(state: MkosiState) -> None:
                 GPGDir = /etc/pacman.d/gnupg/
                 HookDir = {state.root}/etc/pacman.d/hooks/
                 HoldPkg = pacman glibc
-                Architecture = auto
+                Architecture = {state.config.architecture}
                 Color
                 CheckSpace
                 SigLevel = {sig_level}
@@ -6414,10 +6414,11 @@ def load_args(args: argparse.Namespace) -> MkosiConfig:
             args.mirror = "http://archive.ubuntu.com/ubuntu"
             if platform.machine() == "aarch64":
                 args.mirror = "http://ports.ubuntu.com/"
-        elif args.distribution == Distribution.arch and platform.machine() == "aarch64":
-            args.mirror = "http://mirror.archlinuxarm.org"
-        elif args.distribution == Distribution.arch and platform.machine() == "x86_64":
-            args.mirror = "https://geo.mirror.pkgbuild.com"
+        elif args.distribution == Distribution.arch:
+            if args.architecture == "aarch64":
+                args.mirror = "http://mirror.archlinuxarm.org"
+            else:
+                args.mirror = "https://geo.mirror.pkgbuild.com"
         elif args.distribution == Distribution.opensuse:
             args.mirror = "http://download.opensuse.org"
         elif args.distribution in (Distribution.rocky, Distribution.rocky_epel):