conf: warn when extra sources or patches use conflicting numbers

rust2rpm/__main__.py

@@ -1,12 +1,13 @@
 import os
 import pathlib
 import sys
+from typing import Optional
 
 from cargo2rpm.semver import Version
 
 from rust2rpm import log
 from rust2rpm.cli import get_parser
-from rust2rpm.conf import load_config
+from rust2rpm.conf import load_config, TomlConf
 from rust2rpm.crate import InvalidProjectError, InvalidVersionError, process_project
 from rust2rpm.cratesio import NoVersionsError
 from rust2rpm.distgit import get_package_info
@@ -23,6 +24,68 @@ from rust2rpm.utils import (
 )
 
 
+def validate_extra_sources_patches(
+    tomlconf: TomlConf, vendor_tarball: Optional[str], patch_files: tuple[Optional[str], Optional[str]]
+):
+    if extra_sources := tomlconf.package_extra_sources:
+        min_source_number = 2 if vendor_tarball else 1
+
+        for extra_source in extra_sources:
+            if extra_source.number == 0:
+                log.error(
+                    f"Extra source {extra_source.file!r} conflicts with the primary tarball. "
+                    f"Use a number larger than {min_source_number} instead."
+                )
+                sys.exit(1)
+            if extra_source.number == 1 and vendor_tarball:
+                log.error(
+                    f"Extra source {extra_source.file!r} conflicts with the vendor tarball. "
+                    f"Use a number larger than {min_source_number} instead."
+                )
+                sys.exit(1)
+
+            # no conflict now, but maybe later
+            if extra_source.number < 2:
+                log.warn(
+                    f"Extra source {extra_source.file!r} might conflict with other files in the future. "
+                    "Using source numbers >= 2 is recommended."
+                )
+
+    if extra_patches := tomlconf.package_extra_patches:
+        min_patch_number = 0
+        if patch_files[0]:
+            min_patch_number += 1
+        if patch_files[1]:
+            min_patch_number += 1
+
+        for extra_patch in extra_patches:
+            if extra_patch.number == 0 and patch_files[0]:
+                log.error(
+                    f"Extra patch {extra_patch.file!r} conflicts with the automatically generated patch. "
+                    f"Use a number larger than {min_patch_number} instead."
+                )
+                sys.exit(1)
+            if extra_patch.number == 0 and patch_files[1]:
+                log.error(
+                    f"Extra patch {extra_patch.file!r} conflicts with the manually created patch. "
+                    f"Use a number larger than {min_patch_number} instead."
+                )
+                sys.exit(1)
+            if extra_patch.number == 1 and patch_files[0] and patch_files[1]:
+                log.error(
+                    f"Extra patch {extra_patch.file!r} conflicts with the manually created patch. "
+                    f"Use a number larger than {min_patch_number} instead."
+                )
+                sys.exit(1)
+
+            # no conflict now, but maybe later
+            if extra_patch.number < 2:
+                log.warn(
+                    f"Extra patch {extra_patch.file!r} might conflict with other patches in the future. "
+                    "Using patch numbers >= 2 is recommended."
+                )
+
+
 @exit_on_common_errors()
 def main():
     parser = get_parser()
@@ -121,6 +184,9 @@ def main():
     else:
         tomlconf = load_config(set(), args.target)
 
+    # basic validation for extra sources and patches
+    validate_extra_sources_patches(tomlconf, vendor_tarball, patch_files)
+
     # package for a workspace project
     if metadata.is_workspace():
         try: