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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 (
"fmt"
"github.com/sylabs/singularity/v4/internal/pkg/fakeroot"
)
// FakerootConfigOp defines a type for a fakeroot
// configuration operation.
type FakerootConfigOp uint8
const (
// FakerootAddUser is the operation to add a user fakeroot mapping.
FakerootAddUser FakerootConfigOp = iota
// FakerootRemoveUser is the operation to remove a user fakeroot mapping.
FakerootRemoveUser
// FakerootEnableUser is the operation to enable a user fakeroot mapping.
FakerootEnableUser
// FakerootDisableUser is the operation to disable a user fakeroot mapping.
FakerootDisableUser
)
// FakerootConfig allows to add/remove/enable/disable a user fakeroot
// mapping entry in /etc/subuid and /etc/subgid files.
func FakerootConfig(username string, op FakerootConfigOp) error {
subUIDConfig, err := fakeroot.GetConfig(fakeroot.SubUIDFile, true, nil)
if err != nil {
return fmt.Errorf("while opening %s: %s", fakeroot.SubUIDFile, err)
}
subGIDConfig, err := fakeroot.GetConfig(fakeroot.SubGIDFile, true, nil)
if err != nil {
return fmt.Errorf("while opening %s: %s", fakeroot.SubGIDFile, err)
}
switch op {
case FakerootAddUser:
if err := subUIDConfig.AddUser(username); err != nil {
return fmt.Errorf("while adding %s: %s", username, err)
}
if err := subGIDConfig.AddUser(username); err != nil {
return fmt.Errorf("while adding %s: %s", username, err)
}
case FakerootRemoveUser:
if err := subUIDConfig.RemoveUser(username); err != nil {
return fmt.Errorf("while removing %s: %s", username, err)
}
if err := subGIDConfig.RemoveUser(username); err != nil {
return fmt.Errorf("while removing %s: %s", username, err)
}
case FakerootEnableUser:
if err := subUIDConfig.EnableUser(username); err != nil {
return fmt.Errorf("while enabling %s: %s", username, err)
}
if err := subGIDConfig.EnableUser(username); err != nil {
return fmt.Errorf("while enabling %s: %s", username, err)
}
case FakerootDisableUser:
if err := subUIDConfig.DisableUser(username); err != nil {
return fmt.Errorf("while disabling %s: %s", username, err)
}
if err := subGIDConfig.DisableUser(username); err != nil {
return fmt.Errorf("while disabling %s: %s", username, err)
}
default:
return fmt.Errorf("unknown configuration operation")
}
if err := subUIDConfig.Close(); err != nil {
return fmt.Errorf("while writing configuration: %s", err)
}
if err := subGIDConfig.Close(); err != nil {
return fmt.Errorf("while writing configuration: %s", err)
}
return nil
}
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