Fix profile updates and validate configuration before apply

internal/budget/validate.go

@@ -0,0 +1,61 @@
+package budget
+
+import "fmt"
+
+func (c config) validate() error {
+	for _, name := range keys(c.Profiles) {
+		if _, err := c.properties(name); err != nil {
+			return fmt.Errorf("profiles.%s: %w", name, err)
+		}
+	}
+	check := func(field, name string) error {
+		if _, err := c.getProfile(name); err != nil {
+			return fmt.Errorf("%s: %w", field, err)
+		}
+		return nil
+	}
+	for _, field := range []struct {
+		name   string
+		groups map[string][]string
+	}{
+		{"apps", c.Apps}, {"units", c.Units}, {"prefixes", c.Prefixes},
+	} {
+		for _, name := range keys(field.groups) {
+			if err := check(field.name+"."+name, name); err != nil {
+				return err
+			}
+		}
+	}
+	for _, field := range []struct {
+		name string
+		refs map[string]string
+	}{
+		{"commands", c.Commands}, {"shared", c.Shared},
+	} {
+		for _, key := range keys(field.refs) {
+			if err := check(field.name+"."+key, field.refs[key]); err != nil {
+				return err
+			}
+		}
+	}
+	if c.Python != "" {
+		if err := check("python", c.Python); err != nil {
+			return err
+		}
+	}
+	for i, device := range c.Devices {
+		for _, name := range keys(device.Limits) {
+			if err := check(fmt.Sprintf("devices[%d].limits.%s", i, name), name); err != nil {
+				return err
+			}
+		}
+	}
+	for _, name := range keys(c.Prefixes) {
+		for _, directory := range c.Prefixes[name] {
+			if _, err := dropSection(directory); err != nil {
+				return fmt.Errorf("prefixes.%s: %w", name, err)
+			}
+		}
+	}
+	return nil
+}