scripts/build-local.py: Only require runtime when using versioned too…

…lchains

tuxmake allows overriding of internal variables, so toolchains on disk
can be used instead of the versioned toolchain containers. This allows
users to use the LLVM=.../bin/ idiom merged in 5.18 or CROSS_COMPILE=...
to use kernel.org's toolchains to build kernels using tuxmake and yaml
files.

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

scripts/build-local.py

@@ -73,9 +73,7 @@
 elif shutil.which('docker'):
     runtime = 'docker'
 else:
-    raise RuntimeError(
-        "tuxmake requires either podman or docker for versioned toolchains but neither could be found on your system!"
-    )
+    runtime = None
 
 # Combine all jobs into one object for easy iteration
 jobs = {}
@@ -110,6 +108,11 @@
         target_arch = build['target_arch']
         toolchain = build['toolchain']
 
+        if '-' in toolchain and not runtime:
+            raise RuntimeError(
+                f"tuxmake requires either podman or docker to use versioned toolchains ('{toolchain}') but neither could be found on your system!"
+            )
+
         cfg_str = '+'.join(kconfig) if isinstance(kconfig, list) else kconfig
         print(f"I: Building {target_arch} {cfg_str} ({toolchain})... ",
               end='\n' if args.verbose else '',