$ git clone -n https://src.fedoraproject.org/rpms/xosd.git /var/lib/mock/f45-build-39042-731/root/chroot_tmpdir/scmroot/xosd
Cloning into '/var/lib/mock/f45-build-39042-731/root/chroot_tmpdir/scmroot/xosd'...
$ git fetch origin 06dd59ccfc9e721ed0746392db488e04df6627c0:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/xosd
 * [new ref]         06dd59ccfc9e721ed0746392db488e04df6627c0 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 06dd59c Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild