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Special exit codes for build failure

1xx status codes are used when requested builds failed. The following codes are in use:

100 Generic build failure

The builder process returned with a non-zero exit code.
101 Build timeout

The build was aborted because it did not complete within the specified timeout.
102 Hash mismatch

The build output was rejected because it does not match the outputHash attribute of the derivation.
104 Not deterministic

The build succeeded in check mode but the resulting output is not binary reproducible.

With the --keep-going flag it's possible for multiple failures to occur. In this case the 1xx status codes are or combined using bitwise OR.

0b1100100
     ^^^^
     |||`- timeout
     ||`-- output hash mismatch
     |`--- build failure
     `---- not deterministic