$ git clone -n https://src.fedoraproject.org/rpms/rust-winnow.git /var/lib/mock/f40-build-2151144-50903/root/chroot_tmpdir/scmroot/rust-winnow
Cloning into '/var/lib/mock/f40-build-2151144-50903/root/chroot_tmpdir/scmroot/rust-winnow'...
$ git fetch origin b21bab2ffd290278ff556661af75d78523d74e01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-winnow
 * [new ref]         b21bab2ffd290278ff556661af75d78523d74e01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b21bab2 Update to version 0.5.19; Fixes RHBZ#2244145