kernel-install: Use host's package manager configuration and repos

Let's make sure we use the host's package manager configuration and
repositories in the kernel-install plugin. The initrd we produce
should be as compatible with the host as we can make it and making
sure we use the same packages that the host uses is a good step in
achieving that.

diff --git a/kernel-install/50-mkosi.install b/kernel-install/50-mkosi.install
index c8f1e91775aa3778ba3b65946118897d7f954aa5..0f9e9e3867418956b137565e37dd71c6e1d0631a 100644 (file)
--- a/kernel-install/50-mkosi.install
+++ b/kernel-install/50-mkosi.install
@@ -5,12 +5,14 @@ import argparse
 import logging
 import os
 import shutil
+import tempfile
 from pathlib import Path
 from typing import NamedTuple, Optional
 
 from mkosi.config import OutputFormat, __version__
 from mkosi.log import die, log_setup
 from mkosi.run import run, uncaught_exception_handler
+from mkosi.tree import copy_tree
 from mkosi.types import PathString
 
 
@@ -43,37 +45,37 @@ def mandatory_variable(name: str) -> str:
 def main() -> None:
     log_setup()
 
-    p = argparse.ArgumentParser(
+    parser = argparse.ArgumentParser(
         description='kernel-install plugin to build initrds or Unified Kernel Images using mkosi',
         allow_abbrev=False,
         usage='50-mkosi.install COMMAND KERNEL_VERSION ENTRY_DIR KERNEL_IMAGE INITRD…',
     )
 
-    p.add_argument("command",
-                   metavar="COMMAND",
-                   help="The action to perform. Only 'add' is supported.")
-    p.add_argument("kernel_version",
-                   metavar="KERNEL_VERSION",
-                   help="Kernel version string")
-    p.add_argument("entry_dir",
-                   metavar="ENTRY_DIR",
-                   type=Path,
-                   help="Type#1 entry directory (ignored)")
-    p.add_argument("kernel_image",
-                   metavar="KERNEL_IMAGE",
-                   type=Path,
-                   help="Kernel image")
-    p.add_argument("initrds",
-                   metavar="INITRD…",
-                   type=Path,
-                   nargs="*",
-                   help="Initrd files")
-    p.add_argument("--version",
-                   action="version",
-                   version=f"mkosi {__version__}")
+    parser.add_argument("command",
+                        metavar="COMMAND",
+                        help="The action to perform. Only 'add' is supported.")
+    parser.add_argument("kernel_version",
+                        metavar="KERNEL_VERSION",
+                        help="Kernel version string")
+    parser.add_argument("entry_dir",
+                        metavar="ENTRY_DIR",
+                        type=Path,
+                        help="Type#1 entry directory (ignored)")
+    parser.add_argument("kernel_image",
+                        metavar="KERNEL_IMAGE",
+                        type=Path,
+                        help="Kernel image")
+    parser.add_argument("initrds",
+                        metavar="INITRD…",
+                        type=Path,
+                        nargs="*",
+                        help="Initrd files")
+    parser.add_argument("--version",
+                        action="version",
+                        version=f"mkosi {__version__}")
 
     context = Context(
-        **vars(p.parse_args()),
+        **vars(parser.parse_args()),
         staging_area=Path(mandatory_variable("KERNEL_INSTALL_STAGING_AREA")),
         layout=mandatory_variable("KERNEL_INSTALL_LAYOUT"),
         image_type=mandatory_variable("KERNEL_INSTALL_IMAGE_TYPE"),
@@ -117,9 +119,37 @@ def main() -> None:
         if Path(d).exists():
             cmdline += ["--include", d]
 
-    logging.info(f"Building {output}")
-
-    run(cmdline)
+    with tempfile.TemporaryDirectory() as d:
+        # Make sure we don't use any of mkosi's default repositories.
+        for p in (
+            "yum.repos.d/mkosi.repo",
+            "apt/sources.list",
+            "zypp/repos.d/mkosi.repo",
+            "pacman.conf",
+        ):
+            (Path(d) / "etc" / p).parent.mkdir(parents=True, exist_ok=True)
+            (Path(d) / "etc" / p).touch()
+
+        # Copy in the host's package manager configuration.
+        for p in (
+            "dnf",
+            "yum.repos.d/",
+            "apt",
+            "zypp",
+            "pacman.conf",
+            "pacman.d/",
+        ):
+            if not (Path("/etc") / p).exists():
+                continue
+
+            (Path(d) / "etc" / p).parent.mkdir(parents=True, exist_ok=True)
+            copy_tree(Path("/etc") / p, Path(d) / "etc" / p, dereference=True)
+
+        cmdline += ["--package-manager-tree", d]
+
+        logging.info(f"Building {output}")
+
+        run(cmdline)
 
     (context.staging_area / output).unlink()