Description of problem: The checkisomd5 man page currently shows only 2 return values, one for PASS, the other for FAIL or UNKNOWN: EXIT STATUS Program returns exit status 0 if the checksum is correct, or 1 if the checksum is incorrect, non-existent, or check was aborted. If I'm not mistaken, this makes it difficult to fix bug 891548 (ESC during mediacheck drops to emergency shell rather than continuing with the install). I suggest a third return value for UNKNOWN, so the installer can continue with the install on either PASS or UNKNOWN. Version-Release number of selected component (if applicable): isomd5sum-1.0.9-2.fc18 Additional info: Also see bug 839709 which requests a reassignment of the existing two return values. That's independent of this but should be considered when deciding what the return values should be.
Verified that in 19 Alpha TC1, the mediacheck does the right thing for PASS, FAIL, and UNKNOWN. (For the latter, the Esc key lets the install continue.)