$ git clone -n https://src.fedoraproject.org/rpms/rust-backtrace-ext.git /var/lib/mock/f45-build-40374-771/root/chroot_tmpdir/scmroot/rust-backtrace-ext
Cloning into '/var/lib/mock/f45-build-40374-771/root/chroot_tmpdir/scmroot/rust-backtrace-ext'...
$ git fetch origin 9ec4dbcbce5404dc101c3ef07fc617922df8878b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-backtrace-ext
 * [new ref]         9ec4dbcbce5404dc101c3ef07fc617922df8878b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9ec4dbc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild