boot-utils: Bump minimum supported version to Python 3.9

We are going to be adding type annotations to boot-utils. There were
several changes to type annotations in Python 3.9 that are not
compatible with Python 3.8 and easier, such as list[str] instead of
List[str], so just drop support for Python 3.9. With a tool like uv, it
is easy to get a newer version of Python if necessary to run boot-utils.

With this bump, ruff formats a couple of files differently.

Signed-off-by: Nathan Chancellor <nathan@kernel.org>

Author: nathanchance

.github/workflows/main.yml

@@ -6,7 +6,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        version: ['3.14', '3.13', '3.12', '3.11', '3.10', '3.9', '3.8']
+        version: ['3.14', '3.13', '3.12', '3.11', '3.10', '3.9']
     uses: ClangBuiltLinux/actions-workflows/.github/workflows/python_lint.yml@main
     with:
       python_version: ${{ matrix.version }}

boot-qemu.py

@@ -226,8 +226,9 @@ def _run_gdb(self):
             # pylint: disable-next=unexpected-keyword-arg
             with subprocess.Popen(qemu_cmd, **popen_kwargs) as qemu_proc:
                 utils.green(f"Starting {self.gdb_bin}...")
-                with subprocess.Popen(gdb_cmd) as gdb_proc, contextlib.suppress(
-                    KeyboardInterrupt
+                with (
+                    subprocess.Popen(gdb_cmd) as gdb_proc,
+                    contextlib.suppress(KeyboardInterrupt),
                 ):
                     gdb_proc.wait()
 

ruff.toml

@@ -1,4 +1,4 @@
-target-version = 'py38'
+target-version = 'py39'
 
 [format]
 quote-style = 'preserve'

utils.py

@@ -238,9 +238,12 @@ def prepare_initrd(architecture, rootfs_format='cpio', gh_json_file=None, module
                 )
 
         (new_dst := dst.parent.joinpath('rootfs-modules.cpio')).unlink(missing_ok=True)
-        with subprocess.Popen(
-            ['cat', dst, modules], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
-        ) as proc, new_dst.open('xb') as dst_file:
+        with (
+            subprocess.Popen(
+                ['cat', dst, modules], stdout=subprocess.PIPE, stderr=subprocess.STDOUT
+            ) as proc,
+            new_dst.open('xb') as dst_file,
+        ):
             dst_file.write(proc.stdout.read())
         dst = new_dst