$ git clone -n https://src.fedoraproject.org/rpms/rust-syn.git /var/lib/mock/epel10.0-build-60970728-6587095/root/chroot_tmpdir/scmroot/rust-syn
Cloning into '/var/lib/mock/epel10.0-build-60970728-6587095/root/chroot_tmpdir/scmroot/rust-syn'...
$ git fetch origin f2ec6af1c45f4d0dd6d190bdd647915cf4c365b2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-syn
 * [new ref]         f2ec6af1c45f4d0dd6d190bdd647915cf4c365b2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f2ec6af Update to version 2.0.104; Fixes RHBZ#2371352