only show build settings for build commands

Fixes #440

src/fromager/__main__.py

@@ -179,15 +179,20 @@ def main(
     if error_log_file:
         logger.info("logging errors to %s", error_log_file)
 
-    logger.info(f"primary settings file: {settings_file}")
-    logger.info(f"per-package settings dir: {settings_dir}")
-    logger.info(f"variant: {variant}")
-    logger.info(f"patches dir: {patches_dir}")
-    logger.info(f"maximum concurrent jobs: {jobs}")
-    logger.info(f"constraints file: {constraints_file}")
-    logger.info(f"wheel server url: {wheel_server_url}")
-    logger.info(f"network isolation: {network_isolation}")
-    overrides.log_overrides()
+    # if ctx.invoked_subcommand is None
+    if ctx.invoked_subcommand is not None:
+        cmd = main.commands[str(ctx.invoked_subcommand)]
+        do_show = getattr(cmd, "_fromager_show_build_settings", False)
+        if do_show:
+            logger.info(f"primary settings file: {settings_file}")
+            logger.info(f"per-package settings dir: {settings_dir}")
+            logger.info(f"variant: {variant}")
+            logger.info(f"patches dir: {patches_dir}")
+            logger.info(f"maximum concurrent jobs: {jobs}")
+            logger.info(f"constraints file: {constraints_file}")
+            logger.info(f"wheel server url: {wheel_server_url}")
+            logger.info(f"network isolation: {network_isolation}")
+            overrides.log_overrides()
 
     if network_isolation and not SUPPORTS_NETWORK_ISOLATION:
         ctx.fail(f"network isolation is not available: {NETWORK_ISOLATION_ERROR}")

src/fromager/commands/bootstrap.py

@@ -230,3 +230,6 @@ def write_constraints_file(
             for dv in sorted(versions):
                 output.write(f"{dep_name}=={dv}\n")
     return ret
+
+
+bootstrap._fromager_show_build_settings = True  # type: ignore

src/fromager/commands/build.py

@@ -92,6 +92,9 @@ def build(
     print(wheel_filename)
 
 
+build._fromager_show_build_settings = True  # type: ignore
+
+
 @click.command()
 @click.argument("build_order_file")
 @click.option(
@@ -195,6 +198,9 @@ def build_sequence(
     _summary(wkctx, entries)
 
 
+build_sequence._fromager_show_build_settings = True  # type: ignore
+
+
 def _summary(ctx: context.WorkContext, entries: list[BuildSequenceEntry]) -> None:
     output: list[typing.Any] = []
     now = datetime.datetime.utcnow().strftime("%Y-%m-%d %H:%M:%SZ")