$ git clone -n https://src.fedoraproject.org/rpms/perl-Image-ExifTool.git /var/lib/mock/f42-build-side-1-3498691-45963/root/chroot_tmpdir/scmroot/perl-Image-ExifTool
Cloning into '/var/lib/mock/f42-build-side-1-3498691-45963/root/chroot_tmpdir/scmroot/perl-Image-ExifTool'...
$ git fetch origin bd2181294296a0d1b51af4e8b6e27d060dca2173:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Image-ExifTool
 * [new ref]         bd2181294296a0d1b51af4e8b6e27d060dca2173 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd21812 13.10, fix missing BR for new test