$ git clone -n https://src.fedoraproject.org/rpms/rust-serde_regex.git /var/lib/mock/f38-build-side-43-rust-devel-1416090-31457/root/chroot_tmpdir/scmroot/rust-serde_regex
Cloning into '/var/lib/mock/f38-build-side-43-rust-devel-1416090-31457/root/chroot_tmpdir/scmroot/rust-serde_regex'...
$ git fetch origin ed0ff124bfa394a7ce0ddf4bac1ad9e6201dbd47:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-serde_regex
 * [new ref]         ed0ff124bfa394a7ce0ddf4bac1ad9e6201dbd47 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ed0ff12 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild