$ git clone -n https://src.fedoraproject.org/rpms/rust-cairo-sys-rs.git /var/lib/mock/f42-build-side-1-3588212-46943/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs
Cloning into '/var/lib/mock/f42-build-side-1-3588212-46943/root/chroot_tmpdir/scmroot/rust-cairo-sys-rs'...
$ git fetch origin 2e956248d1912b46c5ab5e599bb15270a305ca71:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-cairo-sys-rs
 * [new ref]         2e956248d1912b46c5ab5e599bb15270a305ca71 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2e95624 Update to version 0.20.10; Fixes RHBZ#2365867