$ git clone -n https://src.fedoraproject.org/rpms/perl-String-Truncate.git /var/lib/mock/f45-build-26377-617/root/chroot_tmpdir/scmroot/perl-String-Truncate
Cloning into '/var/lib/mock/f45-build-26377-617/root/chroot_tmpdir/scmroot/perl-String-Truncate'...
$ git fetch origin 6990d6eae1a6e50c3e88e503f39afc595865405c:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-String-Truncate
 * [new ref]         6990d6eae1a6e50c3e88e503f39afc595865405c -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6990d6e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild