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qemu_version.go
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qemu_version.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 qemu
import (
"bufio"
"bytes"
"context"
"fmt"
"strings"
"github.com/Masterminds/semver/v3"
"kraftkit.sh/exec"
)
var (
QemuVersion4_2_0 = semver.New(4, 2, 0, "", "")
QemuVersion5_2_0 = semver.New(5, 2, 0, "", "")
QemuVersion6_2_0 = semver.New(6, 2, 0, "", "")
QemuVersion7_2_0 = semver.New(7, 2, 0, "", "")
QemuVersion7_2_4 = semver.New(7, 2, 4, "", "")
QemuVersion8_0_0 = semver.New(8, 0, 0, "", "")
)
// GetQemuVersionFromBin is direct method of accessing the version of the
// provided QEMU binary by executing it with the well-known flag `-version` and
// parsing its output.
func GetQemuVersionFromBin(ctx context.Context, bin string) (*semver.Version, error) {
e, err := exec.NewExecutable(bin, QemuConfig{
Version: true,
})
if err != nil {
return nil, fmt.Errorf("could not prepare QEMU executable: %v", err)
}
var buf bytes.Buffer
process, err := exec.NewProcessFromExecutable(e,
exec.WithStdout(bufio.NewWriter(&buf)),
)
if err != nil {
return nil, fmt.Errorf("could not prepare QEMU process: %v", err)
}
// Start and also wait for the process to be released, this ensures the
// program is actively being executed.
if err := process.StartAndWait(ctx); err != nil {
return nil, fmt.Errorf("could not start and wait for QEMU process: %v", err)
}
// Get the first line of the returned value
ret := strings.Split(strings.TrimSpace(buf.String()), "\n")[0]
// Check if the returned value has the magic words
if !strings.HasPrefix(ret, "QEMU emulator version ") {
return nil, fmt.Errorf("malformed return value cannot parse QEMU version")
}
ret = strings.TrimPrefix(ret, "QEMU emulator version ")
// Some QEMU versions include the OS distribution that it was compiled for
// after the version number (surrounded by brackets). In every case, just
// split the string and gather everything before the first bracket.
return semver.NewVersion(strings.TrimSpace(strings.Split(ret, "(")[0]))
}