$ git clone -n https://src.fedoraproject.org/rpms/rust-brotli.git /var/lib/mock/f40-build-2250458-54054/root/chroot_tmpdir/scmroot/rust-brotli
Cloning into '/var/lib/mock/f40-build-2250458-54054/root/chroot_tmpdir/scmroot/rust-brotli'...
$ git fetch origin 79a040406bd739a8d99399a80d7cc4c382eef261:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-brotli
 * [new ref]         79a040406bd739a8d99399a80d7cc4c382eef261 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 79a0404 Update to version 3.4.0; Fixes RHBZ#2241463