$ git clone -n https://src.fedoraproject.org/rpms/rust-rustcat.git /var/lib/mock/f41-build-810526-146754/root/chroot_tmpdir/scmroot/rust-rustcat
Cloning into '/var/lib/mock/f41-build-810526-146754/root/chroot_tmpdir/scmroot/rust-rustcat'...
$ git fetch origin 13a42fcae6fbabc10d7adc77fe10a05290040eda:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-rustcat
 * [new ref]         13a42fcae6fbabc10d7adc77fe10a05290040eda -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 13a42fc Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces