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// Copyright (c) 2019, 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 singularity
import (
"bytes"
"fmt"
"io"
"os"
"strings"
"github.com/sylabs/singularity/v4/pkg/util/singularityconf"
"golang.org/x/sys/unix"
)
// GlobalConfigOp defines a type for a global configuration operation.
type GlobalConfigOp uint8
const (
// GlobalConfigSet is the operation to set a configuration directive value.
GlobalConfigSet GlobalConfigOp = iota
// GlobalConfigUnset is the operation to unset a configuration directive value.
GlobalConfigUnset
// GlobalConfigGet is the operation to get a configuration directive value.
GlobalConfigGet
// GlobalConfigReset is the operation to reset a configuration directive value.
GlobalConfigReset
)
func contains(slice []string, val string) bool {
for _, s := range slice {
if s == val {
return true
}
}
return false
}
func generateConfig(path string, directives singularityconf.Directives, dry bool) error {
// Generate the config structure from our directives
c, err := singularityconf.GetConfig(directives)
if err != nil {
return fmt.Errorf("configuration directive invalid: %w", err)
}
// Write a config file to our in memory buffer
newConfig := new(bytes.Buffer)
if err := singularityconf.Generate(newConfig, "", c); err != nil {
return fmt.Errorf("while generating configuration from template: %w", err)
}
// Dry run = write to Stdout
out := os.Stdout
// Not dry run = create / overwrite existing file, now we know we have valid content
if !dry {
unix.Umask(0)
flags := os.O_CREATE | os.O_TRUNC | unix.O_NOFOLLOW | os.O_RDWR
nf, err := os.OpenFile(path, flags, 0o644)
if err != nil {
return fmt.Errorf("while creating configuration file %s: %w", path, err)
}
defer nf.Close()
out = nf
}
_, err = io.Copy(out, newConfig)
if err != nil {
return fmt.Errorf("while writing configuration file %s: %w", path, err)
}
return nil
}
// GlobalConfig allows to set/unset/reset a configuration directive value
// in singularity.conf
func GlobalConfig(args []string, configFile string, dry bool, op GlobalConfigOp) error {
directive := args[0]
value := ""
if directive == "" {
return fmt.Errorf("you must specify a configuration directive")
}
if len(args) > 1 {
value = args[1]
}
if !singularityconf.HasDirective(directive) {
return fmt.Errorf("%q is not a valid configuration directive", directive)
}
f, err := os.OpenFile(configFile, os.O_RDONLY, 0o644)
if err != nil {
return fmt.Errorf("while opening configuration file %s: %s", configFile, err)
}
defer f.Close()
directives, err := singularityconf.GetDirectives(f)
if err != nil {
return err
}
values := []string{}
if value != "" {
for _, v := range strings.Split(value, ",") {
va := strings.TrimSpace(v)
if va != "" {
if contains(values, va) {
continue
}
values = append(values, va)
}
}
}
switch op {
case GlobalConfigSet:
if len(values) == 0 {
return fmt.Errorf("you must specify a value for directive %q", directive)
}
if _, ok := directives[directive]; ok {
for i := len(values) - 1; i >= 0; i-- {
if contains(directives[directive], values[i]) {
values = append(values[:i], values[i+1:]...)
}
}
directives[directive] = append(values, directives[directive]...)
} else {
directives[directive] = values
}
case GlobalConfigUnset:
unset := false
for i := len(directives[directive]) - 1; i >= 0; i-- {
for _, v := range values {
if directives[directive][i] == v {
unset = true
directives[directive] = append(directives[directive][:i], directives[directive][i+1:]...)
}
}
}
if !unset {
return fmt.Errorf("value '%s' not found for directive %q", value, directive)
}
case GlobalConfigGet:
if len(directives[directive]) > 0 {
fmt.Println(strings.Join(directives[directive], ","))
}
return nil
case GlobalConfigReset:
delete(directives, directive)
}
return generateConfig(configFile, directives, dry)
}
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