$ git clone -n https://src.fedoraproject.org/rpms/rust-cargo-c.git /var/lib/mock/f39-build-1731343-41251/root/chroot_tmpdir/scmroot/rust-cargo-c
Cloning into '/var/lib/mock/f39-build-1731343-41251/root/chroot_tmpdir/scmroot/rust-cargo-c'...
$ git fetch origin e2789ecb7efae28fd781580243bfbec61a333490:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cargo-c
 * [new ref]         e2789ecb7efae28fd781580243bfbec61a333490 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e2789ec Update to version 0.9.27+cargo-0.74.0; Fixes RHBZ#2130183