Consolidate runners functions

Consolidate runners functions into a sigle file
to avoid code duplication.

osbuild/util/runners.py

@@ -0,0 +1,82 @@
+import os.path
+import platform
+import shutil
+import subprocess
+import sys
+
+
+def ldconfig(*dirs):
+    # ld.so.conf must exist, or `ldconfig` throws a warning
+    subprocess.run(["touch", "/etc/ld.so.conf"], check=True)
+
+    if len(dirs) > 0:
+        with open("/etc/ld.so.conf", "w", encoding="utf8") as f:
+            for d in dirs:
+                f.write(f"{d}\n")
+            f.flush()
+
+    subprocess.run(["ldconfig"], check=True)
+
+
+def sysusers():
+    try:
+        subprocess.run(
+            ["systemd-sysusers"],
+            stdout=subprocess.PIPE,
+            stderr=subprocess.STDOUT,
+            check=True,
+        )
+    except subprocess.CalledProcessError as error:
+        sys.stderr.write(error.stdout)
+        sys.exit(1)
+
+
+def tmpfiles():
+    # Allow systemd-tmpfiles to return non-0. Some packages want to create
+    # directories owned by users that are not set up with systemd-sysusers.
+    subprocess.run(["systemd-tmpfiles", "--create"], check=False)
+
+
+def nsswitch():
+    # the default behavior is fine, but using nss-resolve does not
+    # necessarily work in a non-booted container, so make sure that
+    # is not configured.
+    try:
+        os.remove("/etc/nsswitch.conf")
+    except FileNotFoundError:
+        pass
+
+
+def python_alternatives():
+    """/usr/bin/python3 is a symlink to /etc/alternatives/python3, which points
+    to /usr/bin/python3.6 by default. Recreate the link in /etc, so that
+    shebang lines in stages and assemblers work.
+    """
+    os.makedirs("/etc/alternatives", exist_ok=True)
+    try:
+        os.symlink("/usr/bin/python3.6", "/etc/alternatives/python3")
+    except FileExistsError:
+        pass
+
+
+def sequoia():
+    # This provides a default set of crypto-policies which is important for
+    # re-enabling SHA1 support with rpm (so we can cross-build CentOS-Stream-9
+    # images).
+    os.makedirs("/etc/crypto-policies", exist_ok=True)
+    shutil.copytree(
+        "/usr/share/crypto-policies/back-ends/DEFAULT", "/etc/crypto-policies/back-ends"
+    )
+
+
+def quirks():
+    # Platform specific quirks
+    env = os.environ.copy()
+
+    if platform.machine() == "aarch64":
+        # Work around a bug in qemu-img on aarch64 that can lead to qemu-img
+        # hangs when more then one coroutine is use (which is the default)
+        # See https://bugs.launchpad.net/qemu/+bug/1805256
+        env["OSBUILD_QEMU_IMG_COROUTINES"] = "1"
+
+    return env