$ git clone -n https://src.fedoraproject.org/rpms/rust-no-panic.git /var/lib/mock/f40-build-2439302-60942/root/chroot_tmpdir/scmroot/rust-no-panic
Cloning into '/var/lib/mock/f40-build-2439302-60942/root/chroot_tmpdir/scmroot/rust-no-panic'...
$ git fetch origin 22c4409f606264bc46f731d9d39b7fcb84338624:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-no-panic
 * [new ref]         22c4409f606264bc46f731d9d39b7fcb84338624 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 22c4409 Update to version 0.1.29; Fixes RHBZ#2259306