mirror of
https://github.com/NVIDIA/nvidia-container-toolkit
synced 2024-11-22 16:29:18 +00:00
80 lines
2.5 KiB
Go
80 lines
2.5 KiB
Go
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/*
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# Copyright (c) 2021, NVIDIA CORPORATION. All rights reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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*/
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package oci
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import (
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"fmt"
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"os"
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"syscall"
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log "github.com/sirupsen/logrus"
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)
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// SyscallExecRuntime wraps the path that a binary and defines the semanitcs for how to exec into it.
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// This can be used to wrap an OCI-compliant low-level runtime binary, allowing it to be used through the
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// Runtime internface.
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type SyscallExecRuntime struct {
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logger *log.Logger
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path string
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// exec is used for testing. This defaults to syscall.Exec
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exec func(argv0 string, argv []string, envv []string) error
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}
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var _ Runtime = (*SyscallExecRuntime)(nil)
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// NewSyscallExecRuntime creates a SyscallExecRuntime for the specified path with the standard logger
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func NewSyscallExecRuntime(path string) (Runtime, error) {
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return NewSyscallExecRuntimeWithLogger(log.StandardLogger(), path)
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}
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// NewSyscallExecRuntimeWithLogger creates a SyscallExecRuntime for the specified logger and path
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func NewSyscallExecRuntimeWithLogger(logger *log.Logger, path string) (Runtime, error) {
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info, err := os.Stat(path)
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if err != nil {
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return nil, fmt.Errorf("invalid path '%v': %v", path, err)
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}
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if info.IsDir() || info.Mode()&0111 == 0 {
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return nil, fmt.Errorf("specified path '%v' is not an executable file", path)
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}
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shim := SyscallExecRuntime{
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logger: logger,
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path: path,
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exec: syscall.Exec,
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}
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return &shim, nil
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}
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// Exec exces into the binary at the path from the SyscallExecRuntime struct, passing it the supplied arguments
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// after ensuring that the first argument is the path of the target binary.
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func (s SyscallExecRuntime) Exec(args []string) error {
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runtimeArgs := []string{s.path}
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if len(args) > 1 {
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runtimeArgs = append(runtimeArgs, args[1:]...)
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}
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err := s.exec(s.path, runtimeArgs, os.Environ())
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if err != nil {
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return fmt.Errorf("could not exec '%v': %v", s.path, err)
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}
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// syscall.Exec is not expected to return. This is an error state regardless of whether
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// err is nil or not.
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return fmt.Errorf("unexpected return from exec '%v'", s.path)
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}
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