package db import ( "encoding/json" "os" "path/filepath" "github.com/pkg/errors" "mcquay.me/fs" "mcquay.me/pm" ) const in = "var/lib/pm/installed.json" // AddInstalled adds m to the installed package database. func AddInstalled(root string, m pm.Meta) error { db, err := loadi(root) if err != nil { return errors.Wrap(err, "loading installed db") } db[m.Name] = m return savei(root, db) } // IsInstalled checks if m is in the installed package database. func IsInstalled(root string, m pm.Meta) (bool, error) { db, err := loadi(root) if err != nil { return false, errors.Wrap(err, "loading installed db") } _, r := db[m.Name] return r, nil } func loadi(root string) (pm.Installed, error) { r := pm.Installed{} dbn := filepath.Join(root, in) if !fs.Exists(dbn) { return r, nil } f, err := os.Open(dbn) if err != nil { return r, errors.Wrap(err, "open") } if err := json.NewDecoder(f).Decode(&r); err != nil { return r, errors.Wrap(err, "decoding db") } return r, nil } func savei(root string, db pm.Installed) error { f, err := os.Create(filepath.Join(root, in)) if err != nil { return errors.Wrap(err, "create") } enc := json.NewEncoder(f) enc.SetIndent("", "\t") if err := enc.Encode(&db); err != nil { return errors.Wrap(err, "decoding db") } if err := f.Close(); err != nil { return errors.Wrap(err, "close db") } return nil }