$ git clone -n https://src.fedoraproject.org/rpms/perl-Graphics-TIFF.git /var/lib/mock/f45-build-23781-599/root/chroot_tmpdir/scmroot/perl-Graphics-TIFF
Cloning into '/var/lib/mock/f45-build-23781-599/root/chroot_tmpdir/scmroot/perl-Graphics-TIFF'...
$ git fetch origin 424b2e2725827fc4f511f0799b120c8fc32ddef7:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Graphics-TIFF
 * [new ref]         424b2e2725827fc4f511f0799b120c8fc32ddef7 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 424b2e2 Perl 5.44 rebuild