func()

in packaging/linux/rpm/template.go [339:404]

• 48 lines of code
• 11 McCabe index (conditional complexity)

func (w *specWrapper) PrepareSources() (fmt.Stringer, error) {
	b := &strings.Builder{}
	if len(w.Spec.Sources) == 0 {
		return b, nil
	}

	fmt.Fprintf(b, "%%prep\n")

	patches := make(map[string]bool)

	for _, v := range w.Spec.Patches {
		for _, p := range v {
			patches[p.Source] = true
		}
	}

	// Sort keys for consistent output
	keys := dalec.SortMapKeys(w.Spec.Sources)

	prepareGomods := sync.OnceFunc(func() {
		if !w.Spec.HasGomods() {
			return
		}
		fmt.Fprintf(b, "mkdir -p \"%%{_builddir}/%s\"\n", gomodsName)
		fmt.Fprintf(b, "tar -C \"%%{_builddir}/%s\" -xzf \"%%{_sourcedir}/%s.tar.gz\"\n", gomodsName, gomodsName)
	})

	prepareCargohomes := sync.OnceFunc(func() {
		if !w.Spec.HasCargohomes() {
			return
		}
		fmt.Fprintf(b, "mkdir -p \"%%{_builddir}/%s\"\n", cargohomeName)
		fmt.Fprintf(b, "tar -C \"%%{_builddir}/%s\" -xzf \"%%{_sourcedir}/%s.tar.gz\"\n", cargohomeName, cargohomeName)
	})

	// Extract all the sources from the rpm source dir
	for _, key := range keys {
		if !dalec.SourceIsDir(w.Spec.Sources[key]) {
			// This is a file, nothing to extract, but we need to put it into place
			// in  the rpm build dir
			fmt.Fprintf(b, "cp -a \"%%{_sourcedir}/%s\" .\n", key)
			continue
		}
		// This is a directory source so it needs to be untarred into the rpm build dir.
		fmt.Fprintf(b, "mkdir -p \"%%{_builddir}/%s\"\n", key)
		fmt.Fprintf(b, "tar -C \"%%{_builddir}/%s\" -xzf \"%%{_sourcedir}/%s.tar.gz\"\n", key, key)
	}
	prepareGomods()
	prepareCargohomes()

	// Apply patches to all sources.
	// Note: These are applied based on the key sorting algorithm (lexicographic).
	//  Using one patch to patch another patch is not supported, except that it may
	//  occur if they happen to be sorted lexicographically.
	patchKeys := dalec.SortMapKeys(w.Spec.Patches)
	for _, key := range patchKeys {
		for _, patch := range w.Spec.Patches[key] {
			fmt.Fprintf(b, "patch -d %q -p%d -s --input \"%%{_builddir}/%s\"\n", key, *patch.Strip, filepath.Join(patch.Source, patch.Path))
		}
	}

	if len(keys) > 0 {
		b.WriteString("\n")
	}
	return b, nil
}