mirror of https://github.com/octoleo/restic.git
65 lines
1.6 KiB
Go
65 lines
1.6 KiB
Go
package restic
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import (
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"context"
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"fmt"
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"github.com/restic/restic/internal/backend"
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"github.com/restic/restic/internal/debug"
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)
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// A MultipleIDMatchesError is returned by Find() when multiple IDs with a
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// given prefix are found.
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type MultipleIDMatchesError struct{ prefix string }
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func (e *MultipleIDMatchesError) Error() string {
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return fmt.Sprintf("multiple IDs with prefix %q found", e.prefix)
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}
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// A NoIDByPrefixError is returned by Find() when no ID for a given prefix
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// could be found.
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type NoIDByPrefixError struct{ prefix string }
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func (e *NoIDByPrefixError) Error() string {
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return fmt.Sprintf("no matching ID found for prefix %q", e.prefix)
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}
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// Find loads the list of all files of type t and searches for names which
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// start with prefix. If none is found, nil and ErrNoIDPrefixFound is returned.
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// If more than one is found, nil and ErrMultipleIDMatches is returned.
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func Find(ctx context.Context, be backend.Lister, t FileType, prefix string) (ID, error) {
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match := ID{}
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ctx, cancel := context.WithCancel(ctx)
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defer cancel()
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err := be.List(ctx, t, func(fi backend.FileInfo) error {
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// ignore filename which are not an id
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id, err := ParseID(fi.Name)
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if err != nil {
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debug.Log("unable to parse %v as an ID", fi.Name)
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return nil
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}
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if len(fi.Name) >= len(prefix) && prefix == fi.Name[:len(prefix)] {
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if match.IsNull() {
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match = id
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} else {
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return &MultipleIDMatchesError{prefix}
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}
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}
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return nil
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})
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if err != nil {
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return ID{}, err
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}
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if !match.IsNull() {
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return match, nil
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}
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return ID{}, &NoIDByPrefixError{prefix}
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}
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