$ git clone -n https://src.fedoraproject.org/rpms/rust-dbl.git /var/lib/mock/f45-build-41238-780/root/chroot_tmpdir/scmroot/rust-dbl
Cloning into '/var/lib/mock/f45-build-41238-780/root/chroot_tmpdir/scmroot/rust-dbl'...
$ git fetch origin 2ec3203e540291739c466c5d4916d881e23cbe81:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-dbl
 * [new ref]         2ec3203e540291739c466c5d4916d881e23cbe81 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2ec3203 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild