Function PatchSysconfig

pkg/python/python.go:525–565

PatchSysconfig patches the python sysconfig variable prefix.

(ctx *gcp.Context, layer *libcnb.Layer)

}

// isBothPyprojectAndRequirementsPresent checks if both pyproject.toml and requirements.txt are present.
func isBothPyprojectAndRequirementsPresent(ctx *gcp.Context) bool {
	pyprojectTomlExists, _ := ctx.FileExists(pyprojectToml)
	requirementsTxtExists, _ := ctx.FileExists(requirements)
	return pyprojectTomlExists && requirementsTxtExists
}

// PatchSysconfig patches the python sysconfig variable prefix.
func PatchSysconfig(ctx *gcp.Context, layer *libcnb.Layer) error {
	if cap := ctx.Capability(SysconfigPatcherCapability); cap != nil {
		p, ok := cap.(sysconfigPatcher)
		if !ok {
			return gcp.InternalErrorf("capability %q must implement sysconfigPatcher", SysconfigPatcherCapability)
		}
		return p.PatchSysconfig(ctx, layer)
	}
	// replace python sysconfig variable prefix from "/opt/python" to "/layers/google.python.runtime/python/" which is the layer.Path
	// python is installed in /layers/google.python.runtime/python/ for unified builder,
	// while the python downloaded from debs is installed in "/opt/python".
	sysconfig, err := ctx.Exec([]string{filepath.Join(layer.Path, "bin/python3"), "-m", "sysconfig"})
	if err != nil {
		ctx.Warnf("Getting python sysconfig: %v", err)
	}
	execPrefix, err := parseExecPrefix(sysconfig.Stdout)
	if err != nil {
		return err
	}
	result, err := ctx.Exec([]string{
		"grep",
		"-rlI",
		execPrefix,
		layer.Path,
	})
	if err != nil {
		ctx.Warnf("Grep failed: %v", err)
	}
	paths := strings.Split(result.Stdout, "\n")
	for _, path := range paths {
		if _, err := ctx.Exec([]string{
			"sed",
			"-i",
			"s|" + execPrefix + "|" + layer.Path + "|g",
			path,
		}); err != nil {