func (chk PHPConfig) Status() (int, string, error) {
	// getPHPVariable returns the value of a PHP configuration value as a string
	// or just "" if it doesn't exist
	getPHPVariable := func(name string) (val string) {
		quote := func(str string) string {
			return "\"" + str + "\""
		}
		// php -r 'echo get_cfg_var("default_mimetype");
		echo := fmt.Sprintf("echo get_cfg_var(%s);", quote(name))
		cmd := exec.Command("php", "-r", echo)
		out, err := cmd.CombinedOutput()
		if err != nil {
			errutil.ExecError(cmd, string(out), err)
		}
		return string(out)
	}
	actualValue := getPHPVariable(chk.variable)
	if actualValue == chk.value {
		return errutil.Success()
	} else if actualValue == "" {
		msg := "PHP configuration variable not set"
		return errutil.GenericError(msg, chk.value, []string{actualValue})
	}
	msg := "PHP variable did not match expected value"
	return errutil.GenericError(msg, chk.value, []string{actualValue})
}

func (chk SystemctlUnitFileStatus) Status() (int, string, error) {
	units, statuses, err := systemdstatus.UnitFileStatuses()
	if err != nil {
		return 1, "", err
	}
	var actualStatus string
	found := false
	for _, unit := range units {
		if unit == chk.unit {
			found = true
		}
	}
	if !found {
		return 1, "Unit file could not be found: " + chk.unit, nil
	}
	for i, un := range units {
		if un == chk.unit {
			actualStatus = statuses[i]
			if actualStatus == chk.status {
				return errutil.Success()
			}
		}
	}
	msg := "Unit didn't have status"
	return errutil.GenericError(msg, chk.status, []string{actualStatus})
}

// RoutingTableMatch asks: Is this value in this column of the routing table?
func RoutingTableMatch(col string, str string) (int, string, error) {
	column := RoutingTableColumn(col)
	if tabular.StrIn(str, column) {
		return errutil.Success()
	}
	return errutil.GenericError("Not found in routing table", str, column)
}

// freeMemOrSwap is an abstraction of FreeMemory and FreeSwap, which measures
// if the desired resource has a quantity free above the amount specified
func freeMemOrSwap(input string, swapOrMem string) (int, string, error) {
	amount, units, err := chkutil.SeparateByteUnits(input)
	if err != nil {
		log.WithFields(log.Fields{
			"err": err.Error(),
		}).Fatal("Couldn't separate string into a scalar and units")
	}
	var actualAmount int
	switch strings.ToLower(swapOrMem) {
	case "memory":
		actualAmount, err = memstatus.FreeMemory(units)
	case "swap":
		actualAmount, err = memstatus.FreeSwap(units)
	default:
		log.Fatalf("Invalid option passed to freeMemoOrSwap: %s", swapOrMem)
	}
	if err != nil {
		return 1, "", err
	} else if actualAmount > amount {
		return errutil.Success()
	}
	msg := "Free " + swapOrMem + " lower than defined threshold"
	actualString := fmt.Sprint(actualAmount) + units
	return errutil.GenericError(msg, input, []string{actualString})
}

func (chk DockerRunningAPI) Status() (int, string, error) {
	running := getRunningContainersAPI(chk.path)
	if tabular.StrContainedIn(chk.name, running) {
		return errutil.Success()
	}
	msg := "Docker container not runnning"
	return errutil.GenericError(msg, chk.name, running)
}

// ResponseMatchesGeneral is an abstraction of ResponseMatches and
// ResponseMatchesInsecure that simply varies in the security of the connection
func ResponseMatchesGeneral(urlstr string, re *regexp.Regexp, secure bool) (int, string, error) {
	body := chkutil.URLToBytes(urlstr, secure)
	if re.Match(body) {
		return errutil.Success()
	}
	msg := "Response didn't match regexp"
	return errutil.GenericError(msg, re.String(), []string{string(body)})
}

// timerCheck is pure DRY for SystemctlTimer and SystemctlTimerLoaded
func timerCheck(unit string, all bool) (int, string, error) {
	timers, err := systemdstatus.Timers(all)
	if err != nil {
		return 1, "", err
	} else if tabular.StrIn(unit, timers) {
		return errutil.Success()
	}
	return errutil.GenericError("Timer not found", unit, timers)
}

// ipCheck(int, string, error) is an abstraction of IP4 and
// IP6
func ipCheck(name string, address *net.IP, version int) (int, string, error) {
	ips := netstatus.InterfaceIPs(name)
	for _, ip := range ips {
		if ip.Equal(*address) {
			return errutil.Success()
		}
	}
	return errutil.GenericError("Interface does not have IP", address, ips)
}

func (chk PortTCP) Status() (int, string, error) {
	if netstatus.PortOpen("tcp", chk.port) {
		return errutil.Success()
	}
	// convert ports to string to send to errutil.GenericError
	var strPorts []string
	for _, port := range netstatus.OpenPorts("tcp") {
		strPorts = append(strPorts, fmt.Sprint(port))
	}
	return errutil.GenericError("Port not open", fmt.Sprint(chk.port), strPorts)
}

func (chk SwapUsage) Status() (int, string, error) {
	actualPercentUsed, err := memstatus.UsedSwap("percent")
	if err != nil {
		return 1, "", err
	}
	if actualPercentUsed < int(chk.maxPercentUsed) {
		return errutil.Success()
	}
	msg := "Swap usage above defined maximum"
	slc := []string{fmt.Sprint(actualPercentUsed)}
	return errutil.GenericError(msg, fmt.Sprint(chk.maxPercentUsed), slc)
}

func (chk InodeUsage) Status() (int, string, error) {
	actualPercentUsed, err := fsstatus.PercentInodesUsed(chk.filesystem)
	if err != nil {
		return 1, "Unexpected error", err
	}
	if actualPercentUsed < chk.maxPercentUsed {
		return errutil.Success()
	}
	msg := "More disk space used than expected"
	slc := []string{fmt.Sprint(actualPercentUsed) + "%"}
	return errutil.GenericError(msg, fmt.Sprint(chk.maxPercentUsed)+"%", slc)
}

// groupNotFound creates generic error messages and exit codes for groupExits,
// UserInGroup, and GroupID
func groupNotFound(name string) (int, string, error) {
	// get a nicely formatted list of groups that do exist
	var existing []string
	groups, err := usrstatus.Groups()
	if err != nil {
		return 1, "", err
	}
	for _, group := range groups {
		existing = append(existing, group.Name)
	}
	return errutil.GenericError("Group not found", name, existing)
}

func (chk GroupID) Status() (int, string, error) {
	groups, err := usrstatus.Groups()
	if err != nil {
		return 0, "", err
	}
	for _, g := range groups {
		if g.Name == chk.name {
			if g.ID == chk.id {
				return errutil.Success()
			}
			msg := "Group does not have expected ID"
			return errutil.GenericError(msg, chk.id, []int{g.ID})
		}
	}
	return groupNotFound(chk.name)
}

func (chk PacmanIgnore) Status() (int, string, error) {
	path := "/etc/pacman.conf"
	data := chkutil.FileToString(path)
	re := regexp.MustCompile(`[^#]IgnorePkg\s+=\s+.+`)
	find := re.FindString(data)
	var packages []string
	if find != "" {
		spl := strings.Split(find, " ")
		errutil.IndexError("Not enough lines in "+path, 2, spl)
		packages = spl[2:] // first two are "IgnorePkg" and "="
		if tabular.StrIn(chk.pkg, packages) {
			return errutil.Success()
		}
	}
	msg := "Couldn't find package in IgnorePkg"
	return errutil.GenericError(msg, chk.pkg, packages)
}

func (chk Checksum) Status() (int, string, error) {
	// getFileChecksum is self-explanatory
	fileChecksum := func(algorithm string, path string) string {
		if path == "" {
			log.Fatal("getFileChecksum got a blank path")
		} else if _, err := os.Stat(chk.path); err != nil {
			log.WithFields(log.Fields{
				"path": chk.path,
			}).Fatal("fileChecksum got an invalid path")
		}
		// we already validated the aglorithm
		chksum, _ := fsstatus.Checksum(algorithm, chkutil.FileToBytes(path))
		return chksum
	}
	actualChksum := fileChecksum(chk.algorithm, chk.path)
	if actualChksum == chk.expectedChksum {
		return errutil.Success()
	}
	msg := "Checksums do not match for file: " + chk.path
	return errutil.GenericError(msg, chk.expectedChksum, []string{actualChksum})
}

// existsRepoWithProperty is an abstraction of YumRepoExists and YumRepoURL.
// It takes a struct field name to check, and an expected value. If the expected
// value is found in the field of a repo, it returns 0, "" else an error message.
// Valid choices for prop: "URL" | "Name" | "Name"
func existsRepoWithProperty(prop string, val *regexp.Regexp, manager string) (int, string, error) {
	var properties []string
	for _, repo := range getRepos(manager) {
		switch prop {
		case "URL":
			properties = append(properties, repo.URL)
		case "Name":
			properties = append(properties, repo.Name)
		case "Status":
			properties = append(properties, repo.Status)
		case "ID":
			properties = append(properties, repo.ID)
		default:
			log.Fatal("Repos don't have the requested property: " + prop)
		}
	}
	if tabular.ReIn(val, properties) {
		return errutil.Success()
	}
	msg := "Repo with given " + prop + " not found"
	return errutil.GenericError(msg, val.String(), properties)
}