Can't compile go project with cgo

[Chiiruno]

Issue description

go get runtime/cgo: open /nix/store/yh6p6ky7w2nfa64r3r7vhr5d5s1p87bk-go-1.11.2/share/go/pkg/linux_amd64/runtime/cgo.a: read-only file system

Steps to reproduce

Install Go
Attempt to compile project that requires cgo. (Not with nix. just regularly)

Technical details

• system: "x86_64-linux"
• host os: Linux 4.18.0, NixOS, 19.03pre162671.44b02b52ea6 (Koi)
• multi-user?: yes
• sandbox: yes
• version: nix-env (Nix) 2.1.3
• channels(root): "nixos-19.03pre162671.44b02b52ea6, nixpkgs-19.03pre155263.20c4986c4dd"
• nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

[Chiiruno]

CC @cstrahan @orivej @velovix @Mic92

[orivej]

I don't know the scope of the issue (I don't remember having encountered it) and whether we can/should fix it, but you can probably work around it by running go build or go install with -pkgdir /tmp (or any other writable directory).

[Mic92]

The same file already exists, so I don' know why tries to recompile it. Usually this happens when build systems are injecting -i into go builds.

[Mic92]

Also tracked here: golang/go#24674

[Mic92]

$ go list -f '{{.Stale}}' runtime/cgo
true
$ go list -f '{{.StaleReason}}' runtime/cgo
not installed but available in build cache

[Mic92]

It seems that there is not much we can do about that but stop using -i in go, which is not useful anymore anyway: golang/go#24674 (comment)

[stale]

Thank you for your contributions.

This has been automatically marked as stale because it has had no activity for 180 days.

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[MasseGuillaume]

The solution is to run go in a nix-shell: https://nixos.wiki/wiki/Go#Using_cgo_on_NixOS