$ git clone -n https://src.fedoraproject.org/rpms/perl-Crypt-SMIME.git /var/lib/mock/f40-build-803201-144204/root/chroot_tmpdir/scmroot/perl-Crypt-SMIME
Cloning into '/var/lib/mock/f40-build-803201-144204/root/chroot_tmpdir/scmroot/perl-Crypt-SMIME'...
$ git fetch origin f953bae0efd1b93170cd8533e060cf8653f67af1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Crypt-SMIME
 * [new ref]         f953bae0efd1b93170cd8533e060cf8653f67af1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f953bae Update to 0.29 (RHBZ #2264507)