$ git clone -n https://src.fedoraproject.org/rpms/rust-umask.git /var/lib/mock/f45-build-45845-828/root/chroot_tmpdir/scmroot/rust-umask
Cloning into '/var/lib/mock/f45-build-45845-828/root/chroot_tmpdir/scmroot/rust-umask'...
$ git fetch origin 4504ba1ab4c00f97c6ee328eb5dada4d43117f0a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-umask
 * [new ref]         4504ba1ab4c00f97c6ee328eb5dada4d43117f0a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4504ba1 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild