$ git clone -n https://src.fedoraproject.org/rpms/rust-darling_macro0.14.git /var/lib/mock/f41-build-side-1-3124864-39482/root/chroot_tmpdir/scmroot/rust-darling_macro0.14
Cloning into '/var/lib/mock/f41-build-side-1-3124864-39482/root/chroot_tmpdir/scmroot/rust-darling_macro0.14'...
$ git fetch origin e38c8646f55a3a8a9c31cdde5ef44d81471d8db5:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-darling_macro0.14
 * [new ref]         e38c8646f55a3a8a9c31cdde5ef44d81471d8db5 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e38c864 compat package no longer needed