internal/rosa/hakurei: optional hostname tool

This makes it more efficient to reuse the helper for partial builds.

Signed-off-by: Ophestra <cat@gensokyo.uk>

internal/rosa/hakurei.go

@@ -2,7 +2,19 @@ package rosa
 
 import "hakurei.app/internal/pkg"
 
-func (t Toolchain) newHakurei(suffix, script string) pkg.Artifact {
+func (t Toolchain) newHakurei(
+	suffix, script string,
+	withHostname bool,
+) pkg.Artifact {
+	hostname := `
+echo '# Building test helper (hostname).'
+go build -v -o /bin/hostname /usr/src/hostname/main.go
+echo
+`
+	if !withHostname {
+		hostname = ""
+	}
+
 	return t.New("hakurei"+suffix+"-"+hakureiVersion, 0, []pkg.Artifact{
 		t.Load(Go),
 
@@ -29,17 +41,12 @@ func (t Toolchain) newHakurei(suffix, script string) pkg.Artifact {
 		"CGO_ENABLED=1",
 		"GOCACHE=/tmp/gocache",
 		"CC=clang -O3 -Werror",
-	}, `
-echo '# Building test helper (hostname).'
-go build -v -o /bin/hostname /usr/src/hostname/main.go
-echo
-
-chmod -R +w /usr/src/hakurei
+	}, hostname+`
 cd /usr/src/hakurei
 
 HAKUREI_VERSION='v`+hakureiVersion+`'
 `+script, pkg.Path(AbsUsrSrc.Append("hakurei"), true, t.NewPatchedSource(
-		"hakurei", hakureiVersion, hakureiSource, true, hakureiPatches...,
+		"hakurei", hakureiVersion, hakureiSource, false, hakureiPatches...,
 	)), pkg.Path(AbsUsrSrc.Append("hostname", "main.go"), false, pkg.NewFile(
 		"hostname.go",
 		[]byte(`
@@ -84,7 +91,7 @@ mkdir -p /work/system/bin/
 	hakurei \
 	sharefs \
 	../../bin/)
-`), hakureiVersion
+`, true), hakureiVersion
 		},
 
 		Name:        "hakurei",
@@ -98,7 +105,7 @@ mkdir -p /work/system/bin/
 			return t.newHakurei("-dist", `
 export HAKUREI_VERSION
 DESTDIR=/work /usr/src/hakurei/dist/release.sh
-`), hakureiVersion
+`, true), hakureiVersion
 		},
 
 		Name:        "hakurei-dist",