generate: Move Generator.spec to Generator.Config

This makes the attribute public, since quite a few config
manipulations are easier using Go's types than they are via
getter/setter/mutator methods.  This also means that we can drop
methods that are more awkward than direct access (although we'll want
to keep methods that are more convenient than direct access).  I
haven't done any method-dropping in this commit though, aside from the
getter/setter for the config itself.  I'd called for this back when we
started adding these methods [1], and Mrunal was sounding more
positive about the public-attribute approach a few weeks ago [2].

I've also renamed this from "spec" to "config", because it is a
config.  I'm not sure why runtime-spec decided to call the main
config.go type 'Spec' [3], but I don't think we should repeat that
idiosyncrasy.

[1]: opencontainers#137 (comment)
[2]: opencontainers#253 (comment)
[3]: https://github.com/opencontainers/runtime-spec/blob/v1.0.0-rc2/specs-go/config.go#L6

Signed-off-by: W. Trevor King <wking@tremily.us>

cmd/oci-runtime-tool/generate.go

@@ -133,9 +133,7 @@ func setupSpec(g *generate.Generator, context *cli.Context) error {
 		g.HostSpecific = true
 	}
 
-	spec := g.Spec()
-
-	if len(spec.Version) == 0 {
+	if len(g.Config.Version) == 0 {
 		g.SetVersion(rspec.Version)
 	}
 

generate/config.go

@@ -0,0 +1,74 @@
+package generate
+
+import (
+	rspec "github.com/opencontainers/runtime-spec/specs-go"
+)
+
+func (g *Generator) initConfig() {
+	if g.Config == nil {
+		g.Config = &rspec.Spec{}
+	}
+}
+
+func (g *Generator) initConfigAnnotations() {
+	g.initConfig()
+	if g.Config.Annotations == nil {
+		g.Config.Annotations = make(map[string]string)
+	}
+}
+
+func (g *Generator) initConfigLinux() {
+	g.initConfig()
+	if g.Config.Linux == nil {
+		g.Config.Linux = &rspec.Linux{}
+	}
+}
+
+func (g *Generator) initConfigLinuxSysctl() {
+	g.initConfigLinux()
+	if g.Config.Linux.Sysctl == nil {
+		g.Config.Linux.Sysctl = make(map[string]string)
+	}
+}
+
+func (g *Generator) initConfigLinuxSeccomp() {
+	g.initConfigLinux()
+	if g.Config.Linux.Seccomp == nil {
+		g.Config.Linux.Seccomp = &rspec.Seccomp{}
+	}
+}
+
+func (g *Generator) initConfigLinuxResources() {
+	g.initConfigLinux()
+	if g.Config.Linux.Resources == nil {
+		g.Config.Linux.Resources = &rspec.Resources{}
+	}
+}
+
+func (g *Generator) initConfigLinuxResourcesCPU() {
+	g.initConfigLinuxResources()
+	if g.Config.Linux.Resources.CPU == nil {
+		g.Config.Linux.Resources.CPU = &rspec.CPU{}
+	}
+}
+
+func (g *Generator) initConfigLinuxResourcesMemory() {
+	g.initConfigLinuxResources()
+	if g.Config.Linux.Resources.Memory == nil {
+		g.Config.Linux.Resources.Memory = &rspec.Memory{}
+	}
+}
+
+func (g *Generator) initConfigLinuxResourcesNetwork() {
+	g.initConfigLinuxResources()
+	if g.Config.Linux.Resources.Network == nil {
+		g.Config.Linux.Resources.Network = &rspec.Network{}
+	}
+}
+
+func (g *Generator) initConfigLinuxResourcesPids() {
+	g.initConfigLinuxResources()
+	if g.Config.Linux.Resources.Pids == nil {
+		g.Config.Linux.Resources.Pids = &rspec.Pids{}
+	}
+}