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/*
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Copyright © 2020-2021 The k3d Author(s)
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.
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*/
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package util
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import (
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"fmt"
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"os"
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rt "runtime"
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"strings"
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"github.com/rancher/k3d/v5/pkg/runtimes"
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l "github.com/rancher/k3d/v5/pkg/logger"
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)
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// ValidateVolumeMount checks, if the source of volume mounts exists and if the destination is an absolute path
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// - SRC: source directory/file -> tests: must exist
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// - DEST: source directory/file -> tests: must be absolute path
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func ValidateVolumeMount(runtime runtimes.Runtime, volumeMount string) error {
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src := ""
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dest := ""
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// validate 'SRC[:DEST]' substring
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split := strings.Split(volumeMount, ":")
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// a volume mapping can have 3 parts seperated by a ':' followed by a node filter
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// [SOURCE:]DEST[:OPT[,OPT]][@NODEFILTER[;NODEFILTER...]]
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// On Windows the source path needs to be an absolute path which means the path starts with
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// a drive designator and will also have a ':' in it. So for Windows the maxParts is increased by one.
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maxParts := 3
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if rt.GOOS == "windows" {
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maxParts++
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}
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if len(split) < 1 {
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return fmt.Errorf("No volume/path specified")
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}
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if len(split) > maxParts {
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return fmt.Errorf("Invalid volume mount '%s': maximal %d ':' allowed", volumeMount, maxParts-1)
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}
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// we only have SRC specified -> DEST = SRC
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// On windows the first part of the SRC is the drive letter, so we need to concat the first and second parts to get the path.
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if len(split) == 1 {
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src = split[0]
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dest = src
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} else if rt.GOOS == "windows" && len(split) >= 3 {
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src = split[0] + ":" + split[1]
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dest = split[2]
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} else {
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src = split[0]
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dest = split[1]
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}
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// verify that the source exists
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if src != "" {
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// a) named volume
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isNamedVolume := true
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if err := verifyNamedVolume(runtime, src); err != nil {
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isNamedVolume = false
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}
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if !isNamedVolume {
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if _, err := os.Stat(src); err != nil {
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l.Log().Warnf("Failed to stat file/directory/named volume that you're trying to mount: '%s' in '%s' -> Please make sure it exists", src, volumeMount)
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}
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}
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}
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// verify that the destination is an absolute path
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if !strings.HasPrefix(dest, "/") {
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return fmt.Errorf("Volume mount destination doesn't appear to be an absolute path: '%s' in '%s'", dest, volumeMount)
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}
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return nil
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}
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// verifyNamedVolume checks whether a named volume exists in the runtime
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func verifyNamedVolume(runtime runtimes.Runtime, volumeName string) error {
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foundVolName, err := runtime.GetVolume(volumeName)
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if err != nil {
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return fmt.Errorf("runtime failed to get volume '%s': %w", volumeName, err)
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}
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if foundVolName == "" {
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return fmt.Errorf("failed to find named volume '%s'", volumeName)
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}
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return nil
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}
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