$ git clone -n https://src.fedoraproject.org/rpms/gnome-online-accounts.git /var/lib/mock/f42-build-side-1-3498048-45961/root/chroot_tmpdir/scmroot/gnome-online-accounts
Cloning into '/var/lib/mock/f42-build-side-1-3498048-45961/root/chroot_tmpdir/scmroot/gnome-online-accounts'...
$ git fetch origin 3c7e54efbadb65356664126034143b6c592dc2f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gnome-online-accounts
 * [new ref]         3c7e54efbadb65356664126034143b6c592dc2f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3c7e54e Add explicit libs dep from main package