$ git clone -n https://src.fedoraproject.org/rpms/rust-rustls.git /var/lib/mock/f38-build-side-42-init-devel-840171-28411/root/chroot_tmpdir/scmroot/rust-rustls
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-840171-28411/root/chroot_tmpdir/scmroot/rust-rustls'...
$ git fetch origin e238b03f1b582e6489fb2068624d6b9b8e57e851:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustls
 * [new ref]         e238b03f1b582e6489fb2068624d6b9b8e57e851 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e238b03 Update to version 0.20.8; Fixes RHBZ#2007947