Merge pull request #2338 from DaanDeMeyer/fix

Fixes

mkosi/__init__.py

@@ -2945,10 +2945,13 @@ def setup_workspace(args: Args, config: Config) -> Iterator[Path]:
                 raise
 
 
-def copy_package_manager_state(context: Context) -> None:
+def copy_repository_metadata(context: Context) -> None:
     if have_cache(context.config) or context.config.base_trees:
         return
 
+    if context.package_cache_dir.exists() and any(context.package_cache_dir.iterdir()):
+        return
+
     subdir = context.config.distribution.package_manager(context.config).subdir(context.config)
 
     for d in ("cache", "lib"):
@@ -2965,7 +2968,7 @@ def copy_package_manager_state(context: Context) -> None:
             # the directories we want to exclude.
             exclude = flatten(["--ro-bind", tmp, os.fspath(p)] for p in caches)
 
-            dst = context.root / "mkosi" / d / subdir
+            dst = context.package_cache_dir / d / subdir
             with umask(~0o755):
                 dst.mkdir(parents=True, exist_ok=True)
 
@@ -2989,10 +2992,9 @@ def build_image(context: Context) -> None:
         install_base_trees(context)
         cached = reuse_cache(context)
 
-        # The repository metadata is copied into the image root directory to ensure it remains static and available
-        # when using the image to build system extensions. This has to be ordered after setup() as cache keys might
-        # depend on config files created by the distribution's setup() method.
-        copy_package_manager_state(context)
+        if not cached:
+            with mount_cache_overlay(context):
+                copy_repository_metadata(context)
 
         context.config.distribution.setup(context)
         install_package_directories(context)

mkosi/distributions/custom.py

@@ -2,9 +2,10 @@
 
 from collections.abc import Sequence
 
-from mkosi.config import Architecture
+from mkosi.config import Architecture, Config
 from mkosi.context import Context
 from mkosi.distributions import DistributionInstaller
+from mkosi.installer import PackageManager
 from mkosi.log import die
 
 
@@ -13,6 +14,10 @@ class Installer(DistributionInstaller):
     def architecture(cls, arch: Architecture) -> str:
         return str(arch)
 
+    @classmethod
+    def package_manager(cls, config: Config) -> type[PackageManager]:
+        return PackageManager
+
     @classmethod
     def setup(cls, context: Context) -> None:
         pass

mkosi/installer/__init__.py

@@ -15,15 +15,15 @@
 class PackageManager:
     @classmethod
     def subdir(cls, config: Config) -> Path:
-        raise NotImplementedError
+        return Path("custom")
 
     @classmethod
     def cache_subdirs(cls, cache: Path) -> list[Path]:
-        raise NotImplementedError
+        return []
 
     @classmethod
     def scripts(cls, context: Context) -> dict[str, list[PathString]]:
-        raise NotImplementedError
+        return {}
 
     @classmethod
     def mounts(cls, context: Context) -> list[PathString]:

mkosi/resources/mkosi.md

@@ -1479,9 +1479,19 @@ boolean argument: either `1`, `yes`, or `true` to enable, or `0`, `no`,
   be used to specify a size in kilobytes, megabytes and gigabytes
   respectively. `directory` optionally specifies the directory in which
   to create the file backing the drive. `options` optionally specifies
-  extra comma-delimited properties which are passed verbatime to qemu's
+  extra comma-delimited properties which are passed verbatim to qemu's
   `-drive` option.
 
+: Example usage:
+
+  ```conf
+  [Host]
+  QemuDrives=btrfs:10G
+             ext4:20G
+  QemuArgs=-device nvme,serial=btrfs,drive=btrfs
+           -device nvme,serial=ext4,drive=ext4
+  ```
+
 `QemuArgs=`
 
 : Space-delimited list of additional arguments to pass when invoking
@@ -1751,10 +1761,13 @@ in consecutive runs with data from the cached one.
 Then, for each image, we execute the following steps:
 
 1. Copy package manager trees into the workspace
+1. Sync the package manager repository metadata
 1. Copy base trees (`--base-tree=`) into the image
+1. Reuse a cached image if one is available
+1. Copy a snapshot of the package manager repository metadata into the
+   image
 1. Copy skeleton trees (`mkosi.skeleton`) into image
-1. Install distribution and packages into image or use cache tree if
-   available
+1. Install distribution and packages into image
 1. Run prepare scripts on image with the `final` argument (`mkosi.prepare`)
 1. Install build packages in overlay if any build scripts are configured
 1. Run prepare scripts on overlay with the `build` argument if any build