$ git clone -n https://src.fedoraproject.org/rpms/gnome-keyring.git /var/lib/mock/f45-build-11438-430/root/chroot_tmpdir/scmroot/gnome-keyring
Cloning into '/var/lib/mock/f45-build-11438-430/root/chroot_tmpdir/scmroot/gnome-keyring'...
$ git fetch origin 5c0c848ea3607f604a29e5e45e6c8c1d48d613db:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-keyring
 * [new ref]         5c0c848ea3607f604a29e5e45e6c8c1d48d613db -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5c0c848 Drop GConf conversion files, they are no longer part of the package