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https://github.com/mudler/luet.git
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c7f9708f90
Add api call which uses go-container registry to create OCI images from standard tar archives. Consume new API when generating final images instead of docker building them and adapts/add tests as necessary. This change now allows to carry over xattrs to final images. Fixes #266
82 lines
2.2 KiB
Go
82 lines
2.2 KiB
Go
// Copyright © 2021 Ettore Di Giacinto <mudler@mocaccino.org>
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License along
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// with this program; if not, see <http://www.gnu.org/licenses/>.
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package image
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import (
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"io"
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"os"
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"github.com/google/go-containerregistry/pkg/name"
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v1 "github.com/google/go-containerregistry/pkg/v1"
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"github.com/google/go-containerregistry/pkg/v1/empty"
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"github.com/google/go-containerregistry/pkg/v1/mutate"
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"github.com/google/go-containerregistry/pkg/v1/tarball"
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"github.com/pkg/errors"
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)
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func imageFromTar(imagename string, r io.Reader) (name.Reference, v1.Image, error) {
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newRef, err := name.ParseReference(imagename)
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if err != nil {
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return nil, nil, err
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}
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layer, err := tarball.LayerFromReader(r)
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if err != nil {
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return nil, nil, err
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}
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img, err := mutate.Append(empty.Image, mutate.Addendum{
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Layer: layer,
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History: v1.History{
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CreatedBy: "luet",
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Comment: "Custom image",
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},
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})
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if err != nil {
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return nil, nil, err
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}
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return newRef, img, nil
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}
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// CreateTar a imagetarball from a standard tarball
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func CreateTar(srctar, dstimageTar, imagename string) error {
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f, err := os.Open(srctar)
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if err != nil {
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return errors.Wrap(err, "Cannot open "+srctar)
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}
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defer f.Close()
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return CreateTarReader(f, dstimageTar, imagename)
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}
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// CreateTarReader a imagetarball from a standard tarball
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func CreateTarReader(r io.Reader, dstimageTar, imagename string) error {
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dstFile, err := os.Create(dstimageTar)
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if err != nil {
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return errors.Wrap(err, "Cannot create "+dstimageTar)
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}
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defer dstFile.Close()
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newRef, img, err := imageFromTar(imagename, r)
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if err != nil {
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return err
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}
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// NOTE: We might also stream that back to the daemon with daemon.Write(tag, img)
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return tarball.Write(newRef, img, dstFile)
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}
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