$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-insta.git /var/lib/mock/f40-build-1221668-22751/root/chroot_tmpdir/scmroot/rust-cargo-insta
Cloning into '/var/lib/mock/f40-build-1221668-22751/root/chroot_tmpdir/scmroot/rust-cargo-insta'...
$ git fetch origin 4bab9cfa87664d5450600632fe12c66ce0ffaf2b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-insta
 * [new ref]         4bab9cfa87664d5450600632fe12c66ce0ffaf2b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4bab9cf Rebuild with Rust 1.78 to fix incomplete debuginfo and backtraces