$ git clone -n https://src.fedoraproject.org/rpms/golang-github-alecthomas-units.git /var/lib/mock/f45-build-11721-434/root/chroot_tmpdir/scmroot/golang-github-alecthomas-units
Cloning into '/var/lib/mock/f45-build-11721-434/root/chroot_tmpdir/scmroot/golang-github-alecthomas-units'...
$ git fetch origin 401f277e7b120bd9563b71e20dd31ca5e68120af:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/golang-github-alecthomas-units
 * [new ref]         401f277e7b120bd9563b71e20dd31ca5e68120af -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 401f277 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild