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unset.go
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unset.go
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// SPDX-License-Identifier: BSD-3-Clause
//
// Authors: Cezar Craciunoiu <cezar.craciunoiu@gmail.com>
//
// Copyright (c) 2022, Unikraft GmbH. All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
// 3. Neither the name of the copyright holder nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
// POSSIBILITY OF SUCH DAMAGE.
package unset
import (
"context"
"fmt"
"os"
"github.com/MakeNowJust/heredoc"
"github.com/spf13/cobra"
"kraftkit.sh/cmdfactory"
"kraftkit.sh/log"
"kraftkit.sh/packmanager"
"kraftkit.sh/unikraft/app"
)
type UnsetOptions struct {
Workdir string `long:"workdir" short:"w" usage:"Work on a unikernel at a path"`
}
// Unset a KConfig option in a Unikraft project.
func Unset(ctx context.Context, opts *UnsetOptions, args ...string) error {
if opts == nil {
opts = &UnsetOptions{}
}
return opts.Run(ctx, args)
}
func NewCmd() *cobra.Command {
cmd, err := cmdfactory.New(&UnsetOptions{}, cobra.Command{
Short: "Unset a variable for a Unikraft project",
Hidden: true,
Use: "unset [OPTIONS] [param ...]",
Aliases: []string{"u"},
Long: heredoc.Doc(`
unset a variable for a Unikraft project
`),
Example: heredoc.Doc(`
# Unset variables in the cwd project
$ kraft unset LIBDEVFS_DEV_STDOUT LWIP_TCP_SND_BUF
# Unset variables in a project at a path
$ kraft unset -w path/to/app LIBDEVFS_DEV_STDOUT LWIP_TCP_SND_BUF
`),
Annotations: map[string]string{
cmdfactory.AnnotationHelpGroup: "build",
cmdfactory.AnnotationHelpHidden: "true",
},
})
if err != nil {
panic(err)
}
return cmd
}
func (*UnsetOptions) Pre(cmd *cobra.Command, _ []string) error {
ctx, err := packmanager.WithDefaultUmbrellaManagerInContext(cmd.Context())
if err != nil {
return err
}
cmd.SetContext(ctx)
return nil
}
func (opts *UnsetOptions) Run(ctx context.Context, args []string) error {
var err error
log.G(ctx).Warnf("This command is DEPRECATED and should not be used")
workdir := ""
confOpts := []string{}
// Skip if nothing can be unset
if len(args) == 0 {
return fmt.Errorf("no options to unset")
}
// Set the working directory
if opts.Workdir != "" {
workdir = opts.Workdir
} else {
workdir, err = os.Getwd()
if err != nil {
return err
}
}
for _, arg := range args {
confOpts = append(confOpts, arg+"=n")
}
// Check if dotconfig exists in workdir
dotconfig := fmt.Sprintf("%s/.config", workdir)
// Check if the file exists
// TODO: offer option to start in interactive mode
if _, err := os.Stat(dotconfig); os.IsNotExist(err) {
return fmt.Errorf("dotconfig file does not exist: %s", dotconfig)
}
// Initialize at least the configuration options for a project
project, err := app.NewProjectFromOptions(
ctx,
app.WithProjectWorkdir(workdir),
// app.WithProjectDefaultConfigPath(),
app.WithProjectConfig(confOpts),
)
if err != nil {
return err
}
return project.Unset(ctx, nil)
}