$ git clone -n https://src.fedoraproject.org/rpms/rust-asn1_derive.git /var/lib/mock/f39-build-1488464-34498/root/chroot_tmpdir/scmroot/rust-asn1_derive
Cloning into '/var/lib/mock/f39-build-1488464-34498/root/chroot_tmpdir/scmroot/rust-asn1_derive'...
$ git fetch origin 536825d3470d178935981de205ef8f08e0d021e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-asn1_derive
 * [new ref]         536825d3470d178935981de205ef8f08e0d021e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 536825d Update to 0.15.5, resolves rhbz#2184208