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distro.go
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distro.go
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// Mgmt
// Copyright (C) 2013-2024+ James Shubin and the project contributors
// Written by James Shubin <james@shubin.ca> and the project contributors
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <https://www.gnu.org/licenses/>.
//
// Additional permission under GNU GPL version 3 section 7
//
// If you modify this program, or any covered work, by linking or combining it
// with embedded mcl code and modules (and that the embedded mcl code and
// modules which link with this program, contain a copy of their source code in
// the authoritative form) containing parts covered by the terms of any other
// license, the licensors of this program grant you additional permission to
// convey the resulting work. Furthermore, the licensors of this program grant
// the original author, James Shubin, additional permission to update this
// additional permission if he deems it necessary to achieve the goals of this
// additional permission.
package util
import (
"context"
"encoding/json"
"fmt"
"io"
"net/http"
"net/url"
"strconv"
)
const (
// FedoraDownloadURL is the default fedora releases and updates download
// URL. If you try to use this, you will get redirected to a mirror near
// you.
FedoraDownloadURL = "https://download.fedoraproject.org/pub/fedora/linux/"
// FedoraReleasesEndpointJSON is the location of the fedora release data
// as specified in json format.
FedoraReleasesEndpointJSON = "https://fedoraproject.org/releases.json"
)
// GetFedoraDownloadURL gets an https base path of a mirror to use for
// downloading both the fedora release and updates. It is supposed to find
// something nearest to you.
// TODO: Do we need to specify version and arch to make sure mirror has those?
func GetFedoraDownloadURL(ctx context.Context) (string, error) {
var out *url.URL
checkRedirectFunc := func(req *http.Request, via []*http.Request) error {
out = req.URL
if len(via) > 1 {
return fmt.Errorf("too many redirects")
}
return nil
}
client := &http.Client{
CheckRedirect: checkRedirectFunc,
}
req, err := http.NewRequestWithContext(ctx, "GET", FedoraDownloadURL, nil)
if err != nil {
return "", err
}
result, err := client.Do(req)
if err != nil {
return "", err
}
defer result.Body.Close()
if out == nil {
return "", fmt.Errorf("no url found")
}
if out.Scheme != "https" {
return "", fmt.Errorf("bad scheme, got: %s", out.Scheme)
}
return out.String(), nil
}
// FedoraRelease is a partial struct of the available data in the json releases
// file found. This was determined by inspection.
type FedoraRelease struct {
Version string `json:"version"`
Arch string `json:"arch"`
Variant string `json:"variant"`
}
// LatestFedoraVersion returns the version number (as a string) of the latest
// fedora release known. This looks at a well-known endpoint to get the value.
// If you specify a non-empty arch, it will filter to that.
func LatestFedoraVersion(ctx context.Context, arch string) (string, error) {
client := &http.Client{}
req, err := http.NewRequestWithContext(ctx, "GET", FedoraReleasesEndpointJSON, nil)
if err != nil {
return "", err
}
res, err := client.Do(req)
if err != nil {
return "", err
}
defer res.Body.Close()
// XXX: We should stream decode this instead.
b, err := io.ReadAll(res.Body)
if err != nil {
return "", err
}
var data []FedoraRelease
if err := json.Unmarshal(b, &data); err != nil {
return "", err
}
//fmt.Printf("len: %d\n", len(data))
m := 0
for _, r := range data {
version, err := strconv.Atoi(r.Version)
if err != nil { // skip strings like "40 Beta"
continue
}
if arch != "" && arch != r.Arch { // skip others
continue
}
m = max(m, version)
}
if m == 0 {
if arch == "" {
return "", fmt.Errorf("no versions found")
}
return "", fmt.Errorf("no versions found with arch: %s", arch)
}
//fmt.Printf("max: %d\n", m)
return strconv.Itoa(m), nil
}