$ git clone -n https://src.fedoraproject.org/rpms/rust-tracing.git /var/lib/mock/f38-build-side-43-rust-devel-1397593-31052/root/chroot_tmpdir/scmroot/rust-tracing
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1397593-31052/root/chroot_tmpdir/scmroot/rust-tracing'...
$ git fetch origin 0b174f39a10f687f5c55d9f5194ea0051509c1c3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-tracing
 * [new ref]         0b174f39a10f687f5c55d9f5194ea0051509c1c3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 0b174f3 Update to version 0.1.38; Fixes RHBZ#2189637