mirror of
https://github.com/opencontainers/runc.git
synced 2026-07-11 06:03:57 +08:00
Kir Kolyshkin
ba9e60f7a8
It appears that when we import github.com/coreos/go-systemd/activation, it brings in the whole crypto/tls package (which is not used by runc directly or indirectly), making the runc binary size larger and potentially creating issues with FIPS compliance. Let's copy the code of function we use from go-systemd/activation to avoid that. The space savings are: $ size runc.before runc.after text data bss dec hex filename 7101084 5049593 271560 12422237 bd8c5d runc.before 6508796 4623281 229128 11361205 ad5bb5 runc.after Reported-by: Dimitri John Ledkov <dimitri.ledkov@surgut.co.uk> Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>
77 lines
2.3 KiB
Go
77 lines
2.3 KiB
Go
// Copyright 2015 CoreOS, Inc.
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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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//go:build !windows
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// Package activation implements primitives for systemd socket activation.
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//
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// It is a partial copy of https://github.com/coreos/go-systemd/v22/activation
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// (https://github.com/coreos/go-systemd/blob/ce60782c0aabb616faa8e60f91e639d91f631e99/activation/files_unix.go),
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// to avoid bringing in crypto/tls dependency.
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package activation
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import (
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"os"
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"strconv"
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"strings"
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"syscall"
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)
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const (
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// listenFdsStart corresponds to `SD_LISTEN_FDS_START`.
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listenFdsStart = 3
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)
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// Files returns a slice containing a `os.File` object for each
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// file descriptor passed to this process via systemd fd-passing protocol.
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//
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// The order of the file descriptors is preserved in the returned slice.
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// `unsetEnv` is typically set to `true` in order to avoid clashes in
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// fd usage and to avoid leaking environment flags to child processes.
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func Files(unsetEnv bool) []*os.File {
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if unsetEnv {
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defer func() {
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// Unsetenv implementation for unix never returns an error.
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_ = os.Unsetenv("LISTEN_PID")
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_ = os.Unsetenv("LISTEN_FDS")
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_ = os.Unsetenv("LISTEN_FDNAMES")
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}()
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}
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pid, err := strconv.Atoi(os.Getenv("LISTEN_PID"))
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if err != nil || pid != os.Getpid() {
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return nil
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}
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nfds, err := strconv.Atoi(os.Getenv("LISTEN_FDS"))
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if err != nil || nfds <= 0 {
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return nil
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}
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names := strings.Split(os.Getenv("LISTEN_FDNAMES"), ":")
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files := make([]*os.File, 0, nfds)
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for fd := listenFdsStart; fd < listenFdsStart+nfds; fd++ {
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syscall.CloseOnExec(fd)
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name := "LISTEN_FD_" + strconv.Itoa(fd)
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offset := fd - listenFdsStart
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if offset < len(names) && len(names[offset]) > 0 {
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name = names[offset]
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}
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files = append(files, os.NewFile(uintptr(fd), name))
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}
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return files
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}
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