$ git clone -n https://src.fedoraproject.org/rpms/kf5-mailimporter.git /var/lib/mock/f45-build-14956-465/root/chroot_tmpdir/scmroot/kf5-mailimporter
Cloning into '/var/lib/mock/f45-build-14956-465/root/chroot_tmpdir/scmroot/kf5-mailimporter'...
$ git fetch origin f24117171c06d47eadd960f2a03215ecec4cde39:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/kf5-mailimporter
 * [new ref]         f24117171c06d47eadd960f2a03215ecec4cde39 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f241171 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild