/
engine.go
69 lines (54 loc) · 2.62 KB
/
engine.go
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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 imgbuild
import (
"fmt"
"syscall"
specs "github.com/opencontainers/runtime-spec/specs-go"
"github.com/sylabs/singularity/internal/pkg/runtime/engines/config"
"github.com/sylabs/singularity/internal/pkg/runtime/engines/config/starter"
imgbuildConfig "github.com/sylabs/singularity/internal/pkg/runtime/engines/imgbuild/config"
"github.com/sylabs/singularity/pkg/util/capabilities"
)
// EngineOperations implements the engines.EngineOperations interface for
// the image build process
type EngineOperations struct {
CommonConfig *config.Common `json:"-"`
EngineConfig *imgbuildConfig.EngineConfig `json:"engineConfig"`
}
// InitConfig initializes engines config internals
func (e *EngineOperations) InitConfig(cfg *config.Common) {
e.CommonConfig = cfg
}
// Config returns the EngineConfig
func (e *EngineOperations) Config() config.EngineConfig {
return e.EngineConfig
}
// PrepareConfig validates/prepares EngineConfig setup
func (e *EngineOperations) PrepareConfig(starterConfig *starter.Config) error {
e.EngineConfig.OciConfig.SetProcessNoNewPrivileges(true)
starterConfig.SetNoNewPrivs(e.EngineConfig.OciConfig.Process.NoNewPrivileges)
if syscall.Getuid() != 0 {
return fmt.Errorf("unable to run imgbuild engine as non-root user")
}
if starterConfig.GetIsSUID() {
return fmt.Errorf("%s don't allow SUID workflow", e.CommonConfig.EngineName)
}
e.EngineConfig.OciConfig.SetupPrivileged(true)
e.EngineConfig.OciConfig.AddOrReplaceLinuxNamespace(specs.MountNamespace, "")
if e.EngineConfig.OciConfig.Linux != nil {
starterConfig.SetNsFlagsFromSpec(e.EngineConfig.OciConfig.Linux.Namespaces)
}
if e.EngineConfig.OciConfig.Process != nil && e.EngineConfig.OciConfig.Process.Capabilities != nil {
starterConfig.SetCapabilities(capabilities.Permitted, e.EngineConfig.OciConfig.Process.Capabilities.Permitted)
starterConfig.SetCapabilities(capabilities.Effective, e.EngineConfig.OciConfig.Process.Capabilities.Effective)
starterConfig.SetCapabilities(capabilities.Inheritable, e.EngineConfig.OciConfig.Process.Capabilities.Inheritable)
starterConfig.SetCapabilities(capabilities.Bounding, e.EngineConfig.OciConfig.Process.Capabilities.Bounding)
starterConfig.SetCapabilities(capabilities.Ambient, e.EngineConfig.OciConfig.Process.Capabilities.Ambient)
}
starterConfig.SetMountPropagation("rslave")
starterConfig.SetSharedMount(true)
return nil
}