$ git clone -n https://src.fedoraproject.org/rpms/perl-Regexp-Trie.git /var/lib/mock/f45-build-26040-614/root/chroot_tmpdir/scmroot/perl-Regexp-Trie
Cloning into '/var/lib/mock/f45-build-26040-614/root/chroot_tmpdir/scmroot/perl-Regexp-Trie'...
$ git fetch origin 67013f15eb249ec27c5c6beb7ba8bd4f8e62ed6b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Regexp-Trie
 * [new ref]         67013f15eb249ec27c5c6beb7ba8bd4f8e62ed6b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 67013f1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild