$ git clone -n https://src.fedoraproject.org/rpms/semacro.git /var/lib/mock/f45-build-35825-699/root/chroot_tmpdir/scmroot/semacro
Cloning into '/var/lib/mock/f45-build-35825-699/root/chroot_tmpdir/scmroot/semacro'...
$ git fetch origin 0b3e4b2ad7350d969677beff5ab6181febbf84db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/semacro
 * [new ref]         0b3e4b2ad7350d969677beff5ab6181febbf84db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b3e4b2 Initial import (fedora#2496845)