repeat, alternative, partial and full bar

[Ali Cuota]

Hello,

I wonder how to codify correctly this minimal example:

\relative c' {
\partial 8
\repeat volta 2 { d8 d4 d8 d }
\alternative { { d4. s8 } { d2 } }
d8 d8 d8 d8 d2
}

the s8 is here to fullfill the bar, but take some space and should
not. Is there a better way?

Thanks in advance!

Franck