$ git clone -n https://src.fedoraproject.org/rpms/rust-decimal.git /var/lib/mock/epel9-build-58900709-6569116/root/chroot_tmpdir/scmroot/rust-decimal
Cloning into '/var/lib/mock/epel9-build-58900709-6569116/root/chroot_tmpdir/scmroot/rust-decimal'...
$ git fetch origin c217dc8650d9e9602ecdefafbf1992c5fdfd5e49:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-decimal
 * [new ref]         c217dc8650d9e9602ecdefafbf1992c5fdfd5e49 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c217dc8 Drop obsolete rustc-serialize support (deprecated since Rust 1.52)