$ git clone -n https://src.fedoraproject.org/rpms/rust-pango-sys0.19.git /var/lib/mock/f42-build-side-1-3588899-46951/root/chroot_tmpdir/scmroot/rust-pango-sys0.19
Cloning into '/var/lib/mock/f42-build-side-1-3588899-46951/root/chroot_tmpdir/scmroot/rust-pango-sys0.19'...
$ git fetch origin c0a09cab72d8432b11c93f3aa8a2c6693e5e40fe:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-pango-sys0.19
 * [new ref]         c0a09cab72d8432b11c93f3aa8a2c6693e5e40fe -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c0a09ca compat package no longer needed