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6 changes: 6 additions & 0 deletions src/bootstrap/bootstrap.py
Original file line number Diff line number Diff line change
Expand Up @@ -1048,6 +1048,12 @@ def bootstrap(args):
"""Configure, fetch, build and run the initial bootstrap"""
rust_root = os.path.abspath(os.path.join(__file__, '../../..'))

if not os.path.exists(os.path.join(rust_root, '.git')) and \
os.path.exists(os.path.join(rust_root, '.github')):
eprint("warn: Looks like you are trying to bootstrap Rust from a source that is neither a "
"git clone nor distributed tarball.\nThis build may fail due to missing submodules "
"unless you put them in place manually.")

# Read from `--config`, then `RUST_BOOTSTRAP_CONFIG`, then `./config.toml`,
# then `config.toml` in the root directory.
toml_path = args.config or os.getenv('RUST_BOOTSTRAP_CONFIG')
Expand Down