$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-HTTP-Server-Simple.git /var/lib/mock/f45-build-26690-618/root/chroot_tmpdir/scmroot/perl-Test-HTTP-Server-Simple
Cloning into '/var/lib/mock/f45-build-26690-618/root/chroot_tmpdir/scmroot/perl-Test-HTTP-Server-Simple'...
$ git fetch origin abe5a57201a62cfbaa141b231c0e09fd3ddf399e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-HTTP-Server-Simple
 * [new ref]         abe5a57201a62cfbaa141b231c0e09fd3ddf399e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at abe5a57 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild