$ git clone -n https://src.fedoraproject.org/rpms/rust-glib-sys.git /var/lib/mock/f40-build-2655705-66912/root/chroot_tmpdir/scmroot/rust-glib-sys
Cloning into '/var/lib/mock/f40-build-2655705-66912/root/chroot_tmpdir/scmroot/rust-glib-sys'...
$ git fetch origin 5607d4c8b2b1f1187193b66bba983c18247ef1cb:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rust-glib-sys
 * [new ref]         5607d4c8b2b1f1187193b66bba983c18247ef1cb -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5607d4c Update to version 0.19.0; Fixes RHBZ#2262624