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We are going to be building rhel8 kernels for 10 years or more, more than one kernel build per day on average. We build them on rhel8 machines.
We would like to remove some easily fixable bottlenecks in the build process.

Please backport the fix from Fedora BZ 1773216 - these three commits:

commit 63d7e4dc112b2b4544813059f9be057f488a2ffd
Author: Denys Vlasenko <dvlasenk>
Date:   Thu Nov 21 15:48:07 2019 +0100
     
    brp-mangle-shebangs: speed up finding of "text executables" (scripts)


commit 618362d6fbb29127e443d45187ddc1be102350bb
Author: Denys Vlasenko <dvlasenk>
Date:   Thu Nov 21 15:51:47 2019 +0100

    brp-mangle-shebangs: fix unsafe/incorrect command expansion


commit 140ee1de89e2acc040562f28b0ff6a1669996725
Author: Denys Vlasenko <dvlasenk>
Date:   Thu Nov 21 17:05:52 2019 +0100

    brp-mangle-shebangs: do not stat / touch files needlessly

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (redhat-rpm-config bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:4825