$ git clone -n https://src.fedoraproject.org/rpms/rust-slog.git /var/lib/mock/f45-build-45009-820/root/chroot_tmpdir/scmroot/rust-slog
Cloning into '/var/lib/mock/f45-build-45009-820/root/chroot_tmpdir/scmroot/rust-slog'...
$ git fetch origin 65f6c77368d46bbc29ed5f30f8b29e6c79b57f3f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-slog
 * [new ref]         65f6c77368d46bbc29ed5f30f8b29e6c79b57f3f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 65f6c77 Update to version 2.8.2; Fixes RHBZ#2401645