tribuchet: building on jamie
tribuchet: unpacking output /nix/store/79bqxj8yrr4r5jgm3nx0dhgfis4dd481-squashfs.img: unpacking into /nix/store/.tribuchet-tmp-79bqxj8yrr4r5jgm3nx0dhgfis4dd481-squashfs.img: creating file /nix/store/.tribuchet-tmp-79bqxj8yrr4r5jgm3nx0dhgfis4dd481-squashfs.img: File exists (os error 17): File exists (os error 17)