$ git clone -n https://src.fedoraproject.org/rpms/libjpeg-turbo.git /var/lib/mock/f45-build-16408-486/root/chroot_tmpdir/scmroot/libjpeg-turbo
Cloning into '/var/lib/mock/f45-build-16408-486/root/chroot_tmpdir/scmroot/libjpeg-turbo'...
$ git fetch origin b589bd97db2886d8adc30f964241c87af5a8117a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/libjpeg-turbo
 * [new ref]         b589bd97db2886d8adc30f964241c87af5a8117a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b589bd9 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild