$ git clone -n https://src.fedoraproject.org/rpms/rust-no-panic.git /var/lib/mock/f39-build-2186477-51357/root/chroot_tmpdir/scmroot/rust-no-panic
Cloning into '/var/lib/mock/f39-build-2186477-51357/root/chroot_tmpdir/scmroot/rust-no-panic'...
$ git fetch origin cda49eb12dc3254b863309eb0267bfae063c0c73:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-no-panic
 * [new ref]         cda49eb12dc3254b863309eb0267bfae063c0c73 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cda49eb Update to version 0.1.28; Fixes RHBZ#2256435