$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo.git /var/lib/mock/f39-build-1888991-42792/root/chroot_tmpdir/scmroot/rust-cargo
Cloning into '/var/lib/mock/f39-build-1888991-42792/root/chroot_tmpdir/scmroot/rust-cargo'...
$ git fetch origin 052cc7728ca4c9e459ece277d0715748f1392976:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo
 * [new ref]         052cc7728ca4c9e459ece277d0715748f1392976 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 052cc77 Update to version 0.74.0; Fixes RHBZ#2129110