$ git clone -n https://src.fedoraproject.org/rpms/R-sandwich.git /var/lib/mock/f39-build-1495727-34545/root/chroot_tmpdir/scmroot/R-sandwich
Cloning into '/var/lib/mock/f39-build-1495727-34545/root/chroot_tmpdir/scmroot/R-sandwich'...
$ git fetch origin e650b78b7f600de45be2615e7925a074373df6fc:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-sandwich
 * [new ref]         e650b78b7f600de45be2615e7925a074373df6fc -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e650b78 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild