$ git clone -n https://src.fedoraproject.org/rpms/perl-ExtUtils-Builder-Compiler.git /var/lib/mock/f45-build-23371-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-Builder-Compiler
Cloning into '/var/lib/mock/f45-build-23371-597/root/chroot_tmpdir/scmroot/perl-ExtUtils-Builder-Compiler'...
$ git fetch origin f93911d8c49a8639ffd9697a4eddd6daefe4ac86:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-ExtUtils-Builder-Compiler
 * [new ref]         f93911d8c49a8639ffd9697a4eddd6daefe4ac86 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f93911d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild