$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-config2.git /var/lib/mock/f40-build-1780536-24818/root/chroot_tmpdir/scmroot/rust-cargo-config2
Cloning into '/var/lib/mock/f40-build-1780536-24818/root/chroot_tmpdir/scmroot/rust-cargo-config2'...
$ git fetch origin 4006eec0e78f3cc9e04f20408d6f55ab73e08cc6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-config2
 * [new ref]         4006eec0e78f3cc9e04f20408d6f55ab73e08cc6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4006eec Update to version 0.1.26; Fixes RHBZ#2274083