$ git clone -n https://src.fedoraproject.org/rpms/rust-prost-build.git /var/lib/mock/f40-build-2157241-50922/root/chroot_tmpdir/scmroot/rust-prost-build
Cloning into '/var/lib/mock/f40-build-2157241-50922/root/chroot_tmpdir/scmroot/rust-prost-build'...
$ git fetch origin 9e12df92a447db6036f96135ffc18129cdfd5700:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-prost-build
 * [new ref]         9e12df92a447db6036f96135ffc18129cdfd5700 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9e12df9 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild