151 lines
2.6 KiB
Go
151 lines
2.6 KiB
Go
package remote
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import (
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"encoding/json"
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"fmt"
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"io"
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"net/url"
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"os"
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"path/filepath"
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"github.com/pkg/errors"
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"mcquay.me/fs"
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)
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// DB is a slice of available URI
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type DB []url.URL
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const rn = "var/lib/pm/remotes.json"
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// Add appends the provided uri to the list of configured remotes.
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func Add(root string, uris []string) error {
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db, err := load(root)
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if err != nil {
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return errors.Wrap(err, "loading")
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}
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dbm := map[string]bool{}
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for _, u := range db {
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dbm[u.String()] = true
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}
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for _, uri := range uris {
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pu, err := url.Parse(uri)
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if err != nil {
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return errors.Wrap(err, "url parse")
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}
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u := strip(*pu)
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if _, ok := dbm[u.String()]; ok {
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return fmt.Errorf("%q already in db", u.String())
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}
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db = append(db, u)
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}
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return save(root, db)
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}
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// Remove removes the given uri from the list of configured remotes.
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func Remove(root string, uris []string) error {
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db, err := load(root)
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if err != nil {
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return errors.Wrap(err, "loading")
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}
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rms := map[string]bool{}
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for _, uri := range uris {
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pu, err := url.Parse(uri)
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if err != nil {
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return errors.Wrap(err, "url parse")
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}
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u := strip(*pu)
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rms[u.String()] = true
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}
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o := DB{}
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for _, d := range db {
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if _, ok := rms[d.String()]; !ok {
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o = append(o, d)
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}
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}
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if len(o) == len(db) {
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return errors.New("found no matching remotes")
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}
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return save(root, o)
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}
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// List prints all configured remotes to w.
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func List(root string, w io.Writer) error {
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db, err := load(root)
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if err != nil {
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return errors.Wrap(err, "loading")
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}
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for _, u := range db {
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fmt.Fprintf(w, "%s\n", u.String())
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}
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return nil
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}
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func load(root string) (DB, error) {
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r := DB{}
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dbn := filepath.Join(root, rn)
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if !fs.Exists(dbn) {
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return r, nil
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}
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f, err := os.Open(filepath.Join(root, rn))
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if err != nil {
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return r, errors.Wrap(err, "open")
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}
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if err := json.NewDecoder(f).Decode(&r); err != nil {
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return r, errors.Wrap(err, "decoding db")
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}
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return r, nil
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}
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func save(root string, db DB) error {
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f, err := os.Create(filepath.Join(root, rn))
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if err != nil {
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return errors.Wrap(err, "create")
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}
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enc := json.NewEncoder(f)
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enc.SetIndent("", "\t")
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if err := enc.Encode(&db); err != nil {
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return errors.Wrap(err, "decoding db")
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}
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if err := f.Close(); err != nil {
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return errors.Wrap(err, "close db")
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}
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return nil
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}
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// strip removes all fields we don't currently need.
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func strip(u url.URL) url.URL {
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return url.URL{
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Scheme: u.Scheme,
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Host: u.Host,
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Path: u.Path,
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}
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}
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func mkdirs(root string) error {
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d, _ := filepath.Split(filepath.Join(root, rn))
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if !fs.Exists(d) {
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if err := os.MkdirAll(d, 0700); err != nil {
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return errors.Wrap(err, "mk pm dir")
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}
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}
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return nil
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}
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