lure/distro/osrelease.go

113 lines
3.0 KiB
Go

/*
* LURE - Linux User REpository
* Copyright (C) 2023 Arsen Musayelyan
*
* 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 <http://www.gnu.org/licenses/>.
*/
package distro
import (
"context"
"errors"
"os"
"strings"
"go.arsenm.dev/lure/internal/shutils"
"mvdan.cc/sh/v3/expand"
"mvdan.cc/sh/v3/interp"
"mvdan.cc/sh/v3/syntax"
)
var ErrParse = errors.New("could not parse os-release file")
type OSRelease struct {
Name string
PrettyName string
ID string
Like []string
VersionID string
ANSIColor string
HomeURL string
DocumentationURL string
SupportURL string
BugReportURL string
Logo string
}
var parsed *OSRelease
// OSReleaseName returns a struct parsed from the system's os-release
// file. It checks /etc/os-release as well as /usr/lib/os-release.
// The returned OSRelease struct is a singleton.
func ParseOSRelease(ctx context.Context) (*OSRelease, error) {
if parsed != nil {
return parsed, nil
}
fl, err := os.Open("/usr/lib/os-release")
if err != nil {
fl, err = os.Open("/etc/os-release")
if err != nil {
return nil, err
}
}
file, err := syntax.NewParser().Parse(fl, "/usr/lib/os-release")
if err != nil {
return nil, err
}
fl.Close()
// Create new shell interpreter with nop open, exec, readdir, and stat handlers
// as well as no environment variables in order to prevent vulnerabilities
// caused by changing the os-release file.
runner, err := interp.New(
interp.OpenHandler(shutils.NopOpen),
interp.ExecHandler(shutils.NopExec),
interp.ReadDirHandler(shutils.NopReadDir),
interp.StatHandler(shutils.NopStat),
interp.Env(expand.ListEnviron()),
)
if err != nil {
return nil, err
}
err = runner.Run(ctx, file)
if err != nil {
return nil, ErrParse
}
out := &OSRelease{
Name: runner.Vars["NAME"].Str,
PrettyName: runner.Vars["PRETTY_NAME"].Str,
ID: runner.Vars["ID"].Str,
VersionID: runner.Vars["VERSION_ID"].Str,
ANSIColor: runner.Vars["ANSI_COLOR"].Str,
HomeURL: runner.Vars["HOME_URL"].Str,
DocumentationURL: runner.Vars["DOCUMENTATION_URL"].Str,
SupportURL: runner.Vars["SUPPORT_URL"].Str,
BugReportURL: runner.Vars["BUG_REPORT_URL"].Str,
Logo: runner.Vars["LOGO"].Str,
}
if runner.Vars["ID_LIKE"].IsSet() {
out.Like = strings.Split(runner.Vars["ID_LIKE"].Str, " ")
}
parsed = out
return out, nil
}