$ git clone -n https://src.fedoraproject.org/rpms/perl-Sys-CPU.git /var/lib/mock/f45-build-26346-617/root/chroot_tmpdir/scmroot/perl-Sys-CPU
Cloning into '/var/lib/mock/f45-build-26346-617/root/chroot_tmpdir/scmroot/perl-Sys-CPU'...
$ git fetch origin bbac5c07f5a86c0775bb77269eec7b4c217dc480:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Sys-CPU
 * [new ref]         bbac5c07f5a86c0775bb77269eec7b4c217dc480 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bbac5c0 Perl 5.44 rebuild