$ git clone -n https://src.fedoraproject.org/rpms/perl-Text-BibTeX.git /var/lib/mock/f45-build-26940-620/root/chroot_tmpdir/scmroot/perl-Text-BibTeX
Cloning into '/var/lib/mock/f45-build-26940-620/root/chroot_tmpdir/scmroot/perl-Text-BibTeX'...
$ git fetch origin a5d03f9574ec467a48e76ba8ff70b17006992bf2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Text-BibTeX
 * [new ref]         a5d03f9574ec467a48e76ba8ff70b17006992bf2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a5d03f9 Perl 5.44 rebuild