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Conceptually the backend configuration should be validated when creating or opening the backend, but not when filling in information from environment variables into the configuration.
70 lines
1.8 KiB
Go
70 lines
1.8 KiB
Go
package gs
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import (
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"os"
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"path"
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"strings"
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"github.com/restic/restic/internal/errors"
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"github.com/restic/restic/internal/options"
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"github.com/restic/restic/internal/restic"
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)
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// Config contains all configuration necessary to connect to a Google Cloud Storage
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// bucket. We use Google's default application credentials to acquire an access token, so
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// we don't require that calling code supply any authentication material here.
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type Config struct {
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ProjectID string
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Bucket string
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Prefix string
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Connections uint `option:"connections" help:"set a limit for the number of concurrent connections (default: 5)"`
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Region string `option:"region" help:"region to create the bucket in (default: us)"`
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}
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// NewConfig returns a new Config with the default values filled in.
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func NewConfig() Config {
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return Config{
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Connections: 5,
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Region: "us",
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}
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}
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func init() {
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options.Register("gs", Config{})
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}
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// ParseConfig parses the string s and extracts the gcs config. The
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// supported configuration format is gs:bucketName:/[prefix].
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func ParseConfig(s string) (*Config, error) {
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if !strings.HasPrefix(s, "gs:") {
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return nil, errors.New("gs: invalid format")
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}
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// strip prefix "gs:"
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s = s[3:]
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// use the first entry of the path as the bucket name and the
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// remainder as prefix
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bucket, prefix, colon := strings.Cut(s, ":")
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if !colon {
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return nil, errors.New("gs: invalid format: bucket name or path not found")
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}
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prefix = strings.TrimPrefix(path.Clean(prefix), "/")
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cfg := NewConfig()
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cfg.Bucket = bucket
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cfg.Prefix = prefix
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return &cfg, nil
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}
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var _ restic.ApplyEnvironmenter = &Config{}
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// ApplyEnvironment saves values from the environment to the config.
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func (cfg *Config) ApplyEnvironment(prefix string) {
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if cfg.ProjectID == "" {
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cfg.ProjectID = os.Getenv(prefix + "GOOGLE_PROJECT_ID")
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}
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}
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