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pack_pull_archive.go
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/
pack_pull_archive.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2022, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package manifest
import (
"context"
"crypto/sha256"
"encoding/base64"
"fmt"
"io"
"net/http"
"net/url"
"os"
"path/filepath"
"github.com/sirupsen/logrus"
"kraftkit.sh/archive"
"kraftkit.sh/internal/version"
"kraftkit.sh/log"
"kraftkit.sh/pack"
"kraftkit.sh/unikraft"
)
type pullProgressArchive struct {
total int
downloaded int
onProgress func(float64)
}
func (pp *pullProgressArchive) Write(p []byte) (n int, err error) {
pp.downloaded += len(p)
if pp.total > 0 && pp.onProgress != nil {
pp.onProgress(float64(pp.downloaded) / float64(pp.total))
}
return len(p), nil
}
// pullArchive is used internally to pull a specific Manifest resource using the
// conventional archive.
func pullArchive(ctx context.Context, manifest *Manifest, opts ...pack.PullOption) error {
popts, err := pack.NewPullOptions(opts...)
if err != nil {
return err
}
resource, cache, checksum, err := resourceCacheChecksum(manifest)
if err != nil {
return err
}
pp := &pullProgressArchive{
onProgress: popts.OnProgress,
total: 0,
downloaded: 0,
}
if f, err := os.Stat(cache); !popts.UseCache() || err != nil || f.Size() == 0 {
u, err := url.Parse(resource)
if err != nil {
return err
}
authHeader := ""
authenticated := false
if auth := popts.Auths(u.Host); auth != nil {
if len(auth.User) > 0 {
authenticated = true
authHeader = "Basic " + base64.StdEncoding.
EncodeToString([]byte(auth.User+":"+auth.Token))
} else if len(auth.Token) > 0 {
authenticated = true
authHeader = "Bearer " + auth.Token
}
}
client := &http.Client{}
head, err := http.NewRequestWithContext(ctx, "HEAD", resource, nil)
if err != nil {
return err
}
head.Header.Set("User-Agent", version.UserAgent())
if authenticated {
head.Header.Set("Authorization", authHeader)
}
log.G(ctx).WithFields(logrus.Fields{
"url": resource,
"method": "HEAD",
"authenticated": authenticated,
}).Trace("http")
// Get the total size of the remote resource. Note: this fails for GitHub
// archives as Content-Length is, for some reason, always set to 0.
res, err := client.Do(head)
if err != nil {
return fmt.Errorf("could not perform HEAD request on resource: %v", err)
} else if res.StatusCode != http.StatusOK {
return fmt.Errorf("received HTTP error code %d on resource", res.StatusCode)
} else if res.ContentLength <= 0 {
log.G(ctx).Tracef("could not determine package size before pulling")
pp.total = 0
} else {
pp.total = int(res.ContentLength)
}
// Create a temporary partial of the destination path of the resource
tmpCache := cache + ".part"
if err := os.MkdirAll(filepath.Dir(tmpCache), 0o755); err != nil {
return fmt.Errorf("could not create parent directorires: %v", err)
}
f, err := os.OpenFile(tmpCache, os.O_RDWR|os.O_CREATE|os.O_TRUNC, 0o755)
if err != nil {
return fmt.Errorf("could not create cache file: %v", err)
}
get, err := http.NewRequestWithContext(ctx, "GET", resource, nil)
if err != nil {
return err
}
get.Header.Set("User-Agent", version.UserAgent())
if authenticated {
head.Header.Set("Authorization", authHeader)
}
log.G(ctx).WithFields(logrus.Fields{
"url": resource,
"method": "GET",
"authenticated": authenticated,
}).Trace("http")
// Perform the request to actually retrieve the file
res, err = client.Do(get)
if err != nil {
return fmt.Errorf("could not initialize GET request to download package: %v", err)
} else if res.StatusCode != http.StatusOK {
return fmt.Errorf("received non-200 HTTP status code when attempting to download package: %v", err)
}
defer res.Body.Close()
// With io.TeeReader we are able to pass in the implementing io.Writer such
// that we are able to call the onProgress method
_, err = io.Copy(f, io.TeeReader(res.Body, pp))
if err != nil {
return err
}
err = f.Close()
if err != nil {
return fmt.Errorf("could not close file '%s' %s", tmpCache, err)
}
if popts.CalculateChecksum() {
log.G(ctx).Debugf("calculating checksum for manifest package...")
if len(checksum) == 0 {
log.G(ctx).Warnf("manifest does not specify checksum!")
} else {
f, err := os.Open(tmpCache)
if err != nil {
return fmt.Errorf("could not perform checksum: %v", err)
}
h := sha256.New()
if _, err := io.Copy(h, f); err != nil {
return fmt.Errorf("could not perform checksum: %v", err)
}
if checksum != string(h.Sum(nil)) {
return fmt.Errorf("checksum of package does not match")
}
err = f.Close()
if err != nil {
return fmt.Errorf("could not close file '%s' %s", tmpCache, err)
}
log.G(ctx).WithFields(logrus.Fields{
"url": resource,
"checksum": checksum,
}).Debug("checksum OK")
}
}
// Copy the completed download to the local cache path
if err := os.Rename(tmpCache, cache); err != nil {
return fmt.Errorf("could not move downloaded package '%s' to destination '%s': %v", tmpCache, cache, err)
}
} else {
log.G(ctx).WithFields(logrus.Fields{
"local": cache,
"remote": resource,
}).Debug("using cache")
}
local := cache
if len(popts.Workdir()) > 0 {
local, err = unikraft.PlaceComponent(
popts.Workdir(),
manifest.Type,
manifest.Name,
)
if err != nil {
return fmt.Errorf("could not place component package: %s", err)
}
}
// Unarchive the package to the given workdir
if len(local) > 0 {
log.G(ctx).WithFields(logrus.Fields{
"from": cache,
"to": local,
}).Trace("unarchiving")
if err := archive.Unarchive(cache, local,
archive.StripComponents(1),
); err != nil {
return fmt.Errorf("could not unarchive: %v", err)
}
}
return nil
}