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// -*- Mode: Go; indent-tabs-mode: t -*-
/*
* Copyright (C) 2020 Canonical Ltd
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 3 as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
package testutil
import (
"fmt"
"os"
"regexp"
"strings"
"gopkg.in/check.v1"
)
type symlinkTargetChecker struct {
*check.CheckerInfo
exact bool
}
// SymlinkTargetEquals verifies that the given file is a symbolic link with the given target.
var SymlinkTargetEquals check.Checker = &symlinkTargetChecker{
CheckerInfo: &check.CheckerInfo{Name: "SymlinkTargetEquals", Params: []string{"filename", "target"}},
exact: true,
}
// SymlinkTargetContains verifies that the given file is a symbolic link whose target contains the provided text.
var SymlinkTargetContains check.Checker = &symlinkTargetChecker{
CheckerInfo: &check.CheckerInfo{Name: "SymlinkTargetContains", Params: []string{"filename", "target"}},
}
// SymlinkTargetMatches verifies that the given file is a symbolic link whose target matches the provided regular expression.
var SymlinkTargetMatches check.Checker = &symlinkTargetChecker{
CheckerInfo: &check.CheckerInfo{Name: "SymlinkTargetMatches", Params: []string{"filename", "regex"}},
}
func (c *symlinkTargetChecker) Check(params []interface{}, names []string) (result bool, error string) {
filename, ok := params[0].(string)
if !ok {
return false, "Filename must be a string"
}
if names[1] == "regex" {
regexpr, ok := params[1].(string)
if !ok {
return false, "Regex must be a string"
}
rx, err := regexp.Compile(regexpr)
if err != nil {
return false, fmt.Sprintf("Cannot compile regexp %q: %v", regexpr, err)
}
params[1] = rx
}
return symlinkTargetCheck(filename, params[1], c.exact)
}
func symlinkTargetCheck(filename string, expectedTarget interface{}, exact bool) (result bool, error string) {
target, err := os.Readlink(filename)
if err != nil {
return false, fmt.Sprintf("Cannot read symbolic link: %v", err)
}
if exact {
switch expectedTarget := expectedTarget.(type) {
case string:
result = target == expectedTarget
default:
error = fmt.Sprintf("Cannot compare symbolic link target with something of type %T", expectedTarget)
}
} else {
switch expectedTarget := expectedTarget.(type) {
case string:
result = strings.Contains(target, expectedTarget)
case *regexp.Regexp:
result = expectedTarget.MatchString(target)
default:
error = fmt.Sprintf("Cannot compare symbolic link target with something of type %T", expectedTarget)
}
}
if !result {
if error == "" {
error = fmt.Sprintf("Failed to match with symbolic link target:\n%v", target)
}
return result, error
}
return result, ""
}
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