$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_with_macros.git /var/lib/mock/f41-build-side-1-2897267-34636/root/chroot_tmpdir/scmroot/rust-serde_with_macros
Cloning into '/var/lib/mock/f41-build-side-1-2897267-34636/root/chroot_tmpdir/scmroot/rust-serde_with_macros'...
$ git fetch origin 8a2b5c003400a2040853e099787d5c77acee0f66:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_with_macros
 * [new ref]         8a2b5c003400a2040853e099787d5c77acee0f66 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8a2b5c0 Update to version 3.11.0; Fixes RHBZ#2315993