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// Copyright (c) 2020-2022 Sylabs Inc. All rights reserved.
// This software is licensed under a 3-clause BSD license. Please consult the
// LICENSE.md file distributed with the sources of this project regarding your
// rights to use or distribute this software.
package plugin
import (
"fmt"
"os"
"path/filepath"
"github.com/sylabs/singularity/v4/internal/pkg/buildcfg"
"github.com/sylabs/singularity/v4/pkg/sylog"
)
const mainGo = `package main
import (
pluginapi "github.com/sylabs/singularity/v4/pkg/plugin"
)
// Plugin is the only variable which a plugin MUST export.
// This symbol is accessed by the plugin framework to initialize the plugin
var Plugin = pluginapi.Plugin{
Manifest: pluginapi.Manifest{
Name: "%s",
Author: "Put your name or mail here",
Version: "0.1.0",
Description: "Put a nice description",
},
Callbacks: []pluginapi.Callback{},
Install: installCallback,
}
func installCallback(path string) error {
// Create required stuff during "plugin install"
// (eg: configuration file, setup ...). Be careful
// during setup as this callback is executed with
// root privileges.
return nil
}
// Write plugin callbacks here and register them in Callbacks
`
const gitIgnore = `singularity_source
*.sif
*.o
*.a
`
// Create creates a skeleton plugin directory structure
// to start development of a new plugin.
func Create(path, name string) error {
if buildcfg.IsReproducibleBuild() {
return fmt.Errorf("plugin functionality is not available in --reproducible builds of singularity")
}
dir, err := filepath.Abs(path)
if err != nil {
return fmt.Errorf("could not determine absolute path for %s: %s", path, err)
}
if err := os.MkdirAll(dir, 0o755); err != nil {
return fmt.Errorf("while creating plugin directory %s: %s", dir, err)
}
// create main.go skeleton
filename := filepath.Join(dir, "main.go")
content := fmt.Sprintf(mainGo, name)
if err := os.WriteFile(filename, []byte(content), 0o644); err != nil {
return fmt.Errorf("while creating plugin %s: %s", filename, err)
}
// create .gitignore skeleton
filename = filepath.Join(dir, ".gitignore")
if err := os.WriteFile(filename, []byte(gitIgnore), 0o644); err != nil {
return fmt.Errorf("while creating plugin %s: %s", filename, err)
}
// create symlink to singularity source directory
source := filepath.Join(dir, SingularitySource)
if _, err := os.Stat(buildcfg.SOURCEDIR); os.IsNotExist(err) {
ls := fmt.Sprintf("ln -s /path/to/singularity/source %s", source)
sylog.Warningf("Singularity source %s doesn't exist, you would have to execute manually %q", buildcfg.SOURCEDIR, ls)
return nil
} else if err != nil {
return fmt.Errorf("while getting %s information: %s", source, err)
}
if err := os.Symlink(buildcfg.SOURCEDIR, source); err != nil {
return fmt.Errorf("while creating symlink %s: %s", source, err)
}
return nil
}
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