Add explicit error message when `master` is specified
Provide a specific error messaeg with a hint towards solution
when a user specifies `master` as ref and we can't find it.
MODIFY
repo2docker/contentproviders/git.py
repo2docker/contentproviders/git.py
@@ -47,9 +47,18 @@ class Git(ContentProvider):
self.log.error(
"Failed to check out ref %s", ref, extra=dict(phase="failed")
)
- raise ValueError("Failed to check out ref {}".format(ref))
+ if ref == "master":
+ msg = (
+ "Failed to check out the 'master' branch. "
+ "Maybe the default branch is not named 'master' "
+ "for this repository.\n\nTry not explicitly "
+ "specifying `--ref`."
+ )
+ else:
+ msg = "Failed to check out ref {}".format(ref)
+ raise ValueError(msg)
# We don't need to explicitly checkout things as the reset will
- # take of that. If the hash is resolved above, we should be
+ # take care of that. If the hash is resolved above, we should be
# able to reset to it
for line in execute_cmd(
["git", "reset", "--hard", hash], cwd=output_dir, capture=yield_output

Add explicit error message when `master` is specified

Provide a specific error messaeg with a hint towards solution
when a user specifies `master` as ref and we can't find it.