$ git clone -n https://src.fedoraproject.org/rpms/rust-gvdb-macros.git /var/lib/mock/f39-build-1656135-40543/root/chroot_tmpdir/scmroot/rust-gvdb-macros
Cloning into '/var/lib/mock/f39-build-1656135-40543/root/chroot_tmpdir/scmroot/rust-gvdb-macros'...
$ git fetch origin c4716b8ecba6036ebc26f543f11e2ad74e5beb87:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-gvdb-macros
 * [new ref]         c4716b8ecba6036ebc26f543f11e2ad74e5beb87 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c4716b8 Update to version 0.1.10; Fixes RHBZ#2238109