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quimage.go
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quimage.go
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// Copyright 2023 the u-root Authors. All rights reserved
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package quimage provides a Go API for creating QEMU VMs with u-root uimage initramfses.
//
// Environment variables:
//
// VMTEST_INITRAMFS_OVERRIDE (when set, use instead of building an initramfs)
package quimage
import (
"errors"
"fmt"
"os"
"path/filepath"
"testing"
"github.com/hugelgupf/vmtest/qemu"
"github.com/hugelgupf/vmtest/testtmp"
"github.com/u-root/gobusybox/src/pkg/golang"
"github.com/u-root/mkuimage/uimage"
"github.com/u-root/uio/llog"
)
// ErrOutputFileSpecified is returned when uimage.Opts are supplied that already
// have an initramfs file.
var ErrOutputFileSpecified = errors.New("initramfs output file must be left unspecified")
// WithUimage builds the specified initramfs and attaches it to the QEMU VM.
//
// When VMTEST_INITRAMFS_OVERRIDE is set, it foregoes building an initramfs and
// uses the initramfs path in the env variable.
//
// The arch used to build the initramfs is derived by default from the arch set
// in qemu.Options, which is either explicitly set, VMTEST_ARCH, or if unset,
// runtime.GOARCH (the host GOARCH).
func WithUimage(l *llog.Logger, initrdPath string, mods ...uimage.Modifier) qemu.Fn {
return func(alloc *qemu.IDAllocator, opts *qemu.Options) error {
if override := os.Getenv("VMTEST_INITRAMFS_OVERRIDE"); len(override) > 0 {
opts.Initramfs = override
return nil
}
mods = append([]uimage.Modifier{
uimage.WithEnv(
golang.DisableCGO(),
golang.WithGOARCH(string(opts.Arch())),
),
uimage.WithCPIOOutput(initrdPath),
}, mods...)
if err := uimage.Create(l, mods...); err != nil {
return fmt.Errorf("error creating initramfs: %w", err)
}
opts.Initramfs = initrdPath
return nil
}
}
// WithUimageT adds an initramfs to the VM using a logger for t and
// placing the initramfs in a test-created temp dir.
func WithUimageT(t testing.TB, mods ...uimage.Modifier) qemu.Fn {
l := llog.Test(t)
initrdPath := filepath.Join(testtmp.TempDir(t), "initramfs.cpio")
return WithUimage(l, initrdPath, append(mods, uimage.WithTempDir(testtmp.TempDir(t)))...)
}