tests/lcitool: fix up indentation to correct style

3 space indentation snuck into the initial commit. Clean it up before
we let it get established. I've also:

  - removed unused os import
  - added double lines between functions
  - added some comments and grouped and sorted the generation stanzas

My lint tool is also recommending using f-strings but that requires
python 3.6.

Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Cc: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Message-Id: <20220527153603.887929-6-alex.bennee@linaro.org>

tests/lcitool/refresh

@@ -13,14 +13,13 @@
 # the top-level directory.
 
 import sys
-import os
 import subprocess
 
 from pathlib import Path
 
 if len(sys.argv) != 1:
-   print("syntax: %s" % sys.argv[0], file=sys.stderr)
-   sys.exit(1)
+    print("syntax: %s" % sys.argv[0], file=sys.stderr)
+    sys.exit(1)
 
 self_dir = Path(__file__).parent
 src_dir = self_dir.parent.parent
@@ -30,76 +29,95 @@ lcitool_path = Path(self_dir, "libvirt-ci", "lcitool")
 
 lcitool_cmd = [lcitool_path, "--data-dir", self_dir]
 
+
 def atomic_write(filename, content):
-   tmp = filename.with_suffix(filename.suffix + ".tmp")
-   try:
-      with tmp.open("w") as fp:
-         print(content, file=fp, end="")
-         tmp.rename(filename)
-   except Exception as ex:
-      tmp.unlink()
-      raise
+    tmp = filename.with_suffix(filename.suffix + ".tmp")
+    try:
+        with tmp.open("w") as fp:
+            print(content, file=fp, end="")
+            tmp.rename(filename)
+    except Exception as ex:
+        tmp.unlink()
+        raise
+
 
 def generate(filename, cmd, trailer):
-   print("Generate %s" % filename)
-   lcitool=subprocess.run(cmd, capture_output=True)
+    print("Generate %s" % filename)
+    lcitool = subprocess.run(cmd, capture_output=True)
 
-   if lcitool.returncode != 0:
-      raise Exception("Failed to generate %s: %s" % (filename, lcitool.stderr))
+    if lcitool.returncode != 0:
+        raise Exception("Failed to generate %s: %s" % (filename, lcitool.stderr))
+
+    content = lcitool.stdout.decode("utf8")
+    if trailer is not None:
+        content += trailer
+    atomic_write(filename, content)
 
-   content = lcitool.stdout.decode("utf8")
-   if trailer is not None:
-      content += trailer
-   atomic_write(filename, content)
 
 def generate_dockerfile(host, target, cross=None, trailer=None):
-   filename = Path(src_dir, "tests", "docker", "dockerfiles", host + ".docker")
-   cmd = lcitool_cmd + ["dockerfile"]
-   if cross is not None:
-      cmd.extend(["--cross", cross])
-   cmd.extend([target, "qemu"])
-   generate(filename, cmd, trailer)
+    filename = Path(src_dir, "tests", "docker", "dockerfiles", host + ".docker")
+    cmd = lcitool_cmd + ["dockerfile"]
+    if cross is not None:
+        cmd.extend(["--cross", cross])
+    cmd.extend([target, "qemu"])
+    generate(filename, cmd, trailer)
+
 
 def generate_cirrus(target, trailer=None):
-   filename = Path(src_dir, ".gitlab-ci.d", "cirrus", target + ".vars")
-   cmd = lcitool_cmd + ["variables", target, "qemu"]
-   generate(filename, cmd, trailer)
+    filename = Path(src_dir, ".gitlab-ci.d", "cirrus", target + ".vars")
+    cmd = lcitool_cmd + ["variables", target, "qemu"]
+    generate(filename, cmd, trailer)
+
 
 ubuntu2004_tsanhack = [
-   "# Apply patch https://reviews.llvm.org/D75820\n",
-   "# This is required for TSan in clang-10 to compile with QEMU.\n",
-   "RUN sed -i 's/^const/static const/g' /usr/lib/llvm-10/lib/clang/10.0.0/include/sanitizer/tsan_interface.h\n"
+    "# Apply patch https://reviews.llvm.org/D75820\n",
+    "# This is required for TSan in clang-10 to compile with QEMU.\n",
+    "RUN sed -i 's/^const/static const/g' /usr/lib/llvm-10/lib/clang/10.0.0/include/sanitizer/tsan_interface.h\n"
 ]
 
+
 def debian_cross_build(prefix, targets):
-   conf = "ENV QEMU_CONFIGURE_OPTS --cross-prefix=%s\n" % (prefix)
-   targets = "ENV DEF_TARGET_LIST %s\n" % (targets)
-   return "".join([conf, targets])
+    conf = "ENV QEMU_CONFIGURE_OPTS --cross-prefix=%s\n" % (prefix)
+    targets = "ENV DEF_TARGET_LIST %s\n" % (targets)
+    return "".join([conf, targets])
 
+#
+# Update all the various build configurations.
+# Please keep each group sorted alphabetically for easy reading.
+#
 
 try:
-   generate_dockerfile("centos8", "centos-stream-8")
-   generate_dockerfile("fedora", "fedora-35")
-   generate_dockerfile("ubuntu2004", "ubuntu-2004",
-                       trailer="".join(ubuntu2004_tsanhack))
-   generate_dockerfile("opensuse-leap", "opensuse-leap-152")
-   generate_dockerfile("alpine", "alpine-edge")
-
-   generate_dockerfile("debian-arm64-cross", "debian-11",
-                       cross="aarch64",
-                       trailer=debian_cross_build("aarch64-linux-gnu-",
-                                                  "aarch64-softmmu,aarch64-linux-user"))
-
-   generate_dockerfile("debian-s390x-cross", "debian-11",
-                       cross="s390x",
-                       trailer=debian_cross_build("s390x-linux-gnu-",
-                                                  "s390x-softmmu,s390x-linux-user"))
-
-   generate_cirrus("freebsd-12")
-   generate_cirrus("freebsd-13")
-   generate_cirrus("macos-11")
-
-   sys.exit(0)
+    #
+    # Standard native builds
+    #
+    generate_dockerfile("alpine", "alpine-edge")
+    generate_dockerfile("centos8", "centos-stream-8")
+    generate_dockerfile("fedora", "fedora-35")
+    generate_dockerfile("opensuse-leap", "opensuse-leap-152")
+    generate_dockerfile("ubuntu2004", "ubuntu-2004",
+                        trailer="".join(ubuntu2004_tsanhack))
+
+    #
+    # Cross compiling builds
+    #
+    generate_dockerfile("debian-arm64-cross", "debian-11",
+                        cross="aarch64",
+                        trailer=debian_cross_build("aarch64-linux-gnu-",
+                                                   "aarch64-softmmu,aarch64-linux-user"))
+
+    generate_dockerfile("debian-s390x-cross", "debian-11",
+                        cross="s390x",
+                        trailer=debian_cross_build("s390x-linux-gnu-",
+                                                   "s390x-softmmu,s390x-linux-user"))
+
+    #
+    # Cirrus packages lists for GitLab
+    #
+    generate_cirrus("freebsd-12")
+    generate_cirrus("freebsd-13")
+    generate_cirrus("macos-11")
+
+    sys.exit(0)
 except Exception as ex:
-   print(str(ex), file=sys.stderr)
-   sys.exit(1)
+    print(str(ex), file=sys.stderr)
+    sys.exit(1)