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// Copyright (c) 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 singularity
import (
"context"
"fmt"
"os"
"github.com/sylabs/singularity/v4/internal/pkg/util/fs"
"github.com/sylabs/singularity/v4/internal/pkg/util/fs/fuse"
"github.com/sylabs/singularity/v4/pkg/sylog"
)
// PostStartHost cleans up a SIF FUSE image mount and the temporary directory
// that holds it. It is called from a POST_START_HOST process that exists in the
// original host namespaces.
func (e *EngineOperations) PostStartHost(ctx context.Context) (err error) {
if e.EngineConfig.GetImageFuse() && e.EngineConfig.GetDeleteTempDir() != "" {
return cleanFUSETempDir(ctx, e)
}
return nil
}
// CleanupHost cleans up a SIF FUSE image mount and the temporary directory that
// holds it. If container creation fails early, in STAGE 1, it will be called
// directly from STAGE 1. Otherwise, it will be called from a CLEANUP_HOST
// process, when the container cleanly exits, or is killed.
func (e *EngineOperations) CleanupHost(ctx context.Context) (err error) {
tmpDir := e.EngineConfig.GetDeleteTempDir()
if e.EngineConfig.GetImageFuse() && tmpDir != "" {
if fs.IsDir(tmpDir) {
return cleanFUSETempDir(ctx, e)
}
}
return nil
}
func cleanFUSETempDir(ctx context.Context, e *EngineOperations) error {
sylog.Debugf("Lazy Unmounting SIF with FUSE...")
if err := fuse.UnmountWithFuseLazy(ctx, e.EngineConfig.GetImage()); err != nil {
return fmt.Errorf("while unmounting fuse directory: %s: %w", e.EngineConfig.GetImage(), err)
}
tmpDir := e.EngineConfig.GetDeleteTempDir()
if tmpDir != "" {
err := os.RemoveAll(tmpDir)
if err != nil {
return fmt.Errorf("failed to delete container image tempDir %s: %s", tmpDir, err)
}
}
return nil
}
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