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f903db492c
In order to change the backend initialization in `global.go` to be able
to generically call cfg.ApplyEnvironment() for supported backends, the
`interface{}` returned by `ParseConfig` must contain a pointer to the
configuration.
An alternative would be to use reflection to convert the type from
`interface{}(Config)` to `interface{}(*Config)` (from value to pointer
type). However, this would just complicate the type mess further.
68 lines
1.7 KiB
Go
68 lines
1.7 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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)
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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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// ApplyEnvironment saves values from the environment to the config.
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func ApplyEnvironment(cfgRaw interface{}) error {
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cfg := cfgRaw.(*Config)
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if cfg.ProjectID == "" {
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cfg.ProjectID = os.Getenv("GOOGLE_PROJECT_ID")
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}
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return nil
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}
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