129 lines
3.5 KiB
Go
129 lines
3.5 KiB
Go
//go:build linux
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/*
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Copyright The containerd Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package devmapper
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import (
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"fmt"
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"os"
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"github.com/docker/go-units"
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"github.com/hashicorp/go-multierror"
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"github.com/pelletier/go-toml"
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)
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// Config represents device mapper configuration loaded from file.
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// Size units can be specified in human-readable string format (like "32KIB", "32GB", "32Tb")
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type Config struct {
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// Device snapshotter root directory for metadata
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RootPath string `toml:"root_path"`
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// Name for 'thin-pool' device to be used by snapshotter (without /dev/mapper/ prefix)
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PoolName string `toml:"pool_name"`
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// Defines how much space to allocate when creating base image for container
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BaseImageSize string `toml:"base_image_size"`
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BaseImageSizeBytes uint64 `toml:"-"`
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// Flag to async remove device using Cleanup() callback in snapshots GC
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AsyncRemove bool `toml:"async_remove"`
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// Whether to discard blocks when removing a thin device.
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DiscardBlocks bool `toml:"discard_blocks"`
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// Defines file system to use for snapshout device mount. Defaults to "ext4"
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FileSystemType fsType `toml:"fs_type"`
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// Defines optional file system options passed through config file
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FsOptions string `toml:"fs_options"`
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}
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// LoadConfig reads devmapper configuration file from disk in TOML format
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func LoadConfig(path string) (*Config, error) {
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if _, err := os.Stat(path); err != nil {
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if os.IsNotExist(err) {
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return nil, os.ErrNotExist
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}
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return nil, err
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}
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config := Config{}
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file, err := toml.LoadFile(path)
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if err != nil {
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return nil, fmt.Errorf("failed to open devmapepr TOML: %s: %w", path, err)
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}
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if err := file.Unmarshal(&config); err != nil {
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return nil, fmt.Errorf("failed to unmarshal devmapper TOML: %w", err)
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}
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if err := config.parse(); err != nil {
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return nil, err
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}
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if err := config.Validate(); err != nil {
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return nil, err
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}
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return &config, nil
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}
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func (c *Config) parse() error {
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baseImageSize, err := units.RAMInBytes(c.BaseImageSize)
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if err != nil {
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return fmt.Errorf("failed to parse base image size: '%s': %w", c.BaseImageSize, err)
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}
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if c.FileSystemType == "" {
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c.FileSystemType = fsTypeExt4
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}
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c.BaseImageSizeBytes = uint64(baseImageSize)
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return nil
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}
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// Validate makes sure configuration fields are valid
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func (c *Config) Validate() error {
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var result *multierror.Error
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if c.PoolName == "" {
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result = multierror.Append(result, fmt.Errorf("pool_name is required"))
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}
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if c.RootPath == "" {
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result = multierror.Append(result, fmt.Errorf("root_path is required"))
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}
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if c.BaseImageSize == "" {
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result = multierror.Append(result, fmt.Errorf("base_image_size is required"))
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}
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if c.FileSystemType != "" {
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switch c.FileSystemType {
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case fsTypeExt4, fsTypeXFS, fsTypeExt2:
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default:
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result = multierror.Append(result, fmt.Errorf("unsupported Filesystem Type: %q", c.FileSystemType))
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}
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} else {
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result = multierror.Append(result, fmt.Errorf("filesystem type cannot be empty"))
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}
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return result.ErrorOrNil()
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}
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