Method sysInfoIfExists

internal/devpkg/narinfo_cache.go:230–255

sysInfoIfExists returns the system info for the user's system. If the sysInfo is missing, then nil is returned NOTE: this is called from multiple go-routines and needs to be concurrency safe. Hence, we compute nix.Version, nix.System and lockfile.Resolve prior to calling this function from within a

()

// Hence, we compute nix.Version, nix.System and lockfile.Resolve prior to calling this
// function from within a goroutine.
func (p *Package) sysInfoIfExists() (*lock.SystemInfo, error) {
	if !p.isVersioned() {
		return nil, nil
	}

	// disable for nix < 2.17
	if !nix.AtLeast(nix.Version2_17) {
		return nil, nil
	}

	entry, err := p.lockfile.Resolve(p.Raw)
	if err != nil {
		return nil, err
	}

	if entry.Systems == nil {
		return nil, nil
	}

	// Check if the user's system's info is present in the lockfile
	sysInfo, ok := entry.Systems[nix.System()]
	if !ok {
		return nil, nil
	}
	return sysInfo, nil
}

var narInfoStatusFnCache = sync.Map{}