diff options
Diffstat (limited to 'lib/portage/process.py')
| -rw-r--r-- | lib/portage/process.py | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/portage/process.py b/lib/portage/process.py index 5ba6c7867..6760f617c 100644 --- a/lib/portage/process.py +++ b/lib/portage/process.py @@ -437,6 +437,35 @@ def spawn( except SystemExit: raise except Exception as e: + if isinstance(e, OSError) and e.errno == errno.E2BIG: + # If exec() failed with E2BIG, then this is + # potentially because the environment variables + # grew to large. The following will gather some + # stats about the environment and print a + # diagnostic message to help identifying the + # culprit. See also + # - https://bugs.gentoo.org/721088 + # - https://bugs.gentoo.org/830187 + def encoded_length(s): + return len(os.fsencode(s)) + + env_size = 0 + env_largest_name = None + env_largest_size = 0 + for env_name, env_value in env.items(): + env_name_size = encoded_length(env_name) + env_value_size = encoded_length(env_value) + # Add two for '=' and the terminating null byte. + total_size = env_name_size + env_value_size + 2 + if total_size > env_largest_size: + env_largest_name = env_name + env_largest_size = total_size + env_size += total_size + + writemsg( + f"ERROR: Executing {mycommand} failed with E2BIG. Child process environment size: {env_size} bytes. Largest environment variable: {env_largest_name} ({env_largest_size} bytes)\n" + ) + # We need to catch _any_ exception so that it doesn't # propagate out of this function and cause exiting # with anything other than os._exit() |