$ git clone -n https://src.fedoraproject.org/rpms/rust-tinystr.git /var/lib/mock/f45-build-45451-823/root/chroot_tmpdir/scmroot/rust-tinystr
Cloning into '/var/lib/mock/f45-build-45451-823/root/chroot_tmpdir/scmroot/rust-tinystr'...
$ git fetch origin aea90ff4d213bac7a21b328da48d3f760d05b51d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tinystr
 * [new ref]         aea90ff4d213bac7a21b328da48d3f760d05b51d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at aea90ff Update to version 0.8.4; Fixes RHBZ#2515912