tests/test-execute-bit.out

Improvement to 14ce129cfcd: Use try/except and pass filename on errors

Without the second part, the error message would be
  abort: Is a directory
instead of
  abort: Is a directory: /home/user/.cvspass

adding a
79abf14474dc tip
% make sure we notice the change of mode if the cached size == -1
n   0         -1 unset               a
M a
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
d69afc33ff8a
not executable -- whew