69 lines
1.4 KiB
Go
69 lines
1.4 KiB
Go
package pkg
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import (
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"io"
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"net/http"
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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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"mcquay.me/pm"
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"mcquay.me/pm/db"
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)
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const cache = "var/cache/pm"
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// Install fetches and installs pkgs from appropriate remotes.
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func Install(root string, pkgs []string) error {
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av, err := db.LoadAvailable(root)
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if err != nil {
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return errors.Wrap(err, "loading available db")
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}
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ms, err := av.Installable(pkgs)
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if err != nil {
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return errors.Wrap(err, "checking ability to install")
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}
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cacheDir := filepath.Join(root, cache)
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if !fs.Exists(cacheDir) {
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if err := os.MkdirAll(cacheDir, 0755); err != nil {
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return errors.Wrap(err, "creating non-existent cache dir")
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}
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}
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if !fs.IsDir(cacheDir) {
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return errors.Errorf("%q is not a directory!", cacheDir)
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}
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if err := download(cacheDir, ms); err != nil {
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return errors.Wrap(err, "downloading")
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}
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return errors.New("NYI")
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}
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func download(cache string, ms pm.Metas) error {
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// TODO (sm): concurrently fetch
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for _, m := range ms {
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resp, err := http.Get(m.URL())
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if err != nil {
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return errors.Wrap(err, "http get")
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}
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fn := filepath.Join(cache, m.Pkg())
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f, err := os.Create(fn)
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if err != nil {
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return errors.Wrap(err, "creating")
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}
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if n, err := io.Copy(f, resp.Body); err != nil {
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return errors.Wrapf(err, "copy %q to disk after %d bytes", m.URL(), n)
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}
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if err := resp.Body.Close(); err != nil {
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return errors.Wrap(err, "closing resp body")
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}
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}
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return nil
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}
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