forked from github/multus-cni
ac21a96804
gomodule is still in progress to migrate for now, hence multus team decide to keep vendor directory to support build without gomodule.
107 lines
3.5 KiB
Go
107 lines
3.5 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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// mkpost processes the output of cgo -godefs to
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// modify the generated types. It is used to clean up
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// the sys API in an architecture specific manner.
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//
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// mkpost is run after cgo -godefs; see README.md.
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package main
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import (
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"bytes"
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"fmt"
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"go/format"
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"io/ioutil"
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"log"
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"os"
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"regexp"
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)
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func main() {
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// Get the OS and architecture (using GOARCH_TARGET if it exists)
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goos := os.Getenv("GOOS")
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goarch := os.Getenv("GOARCH_TARGET")
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if goarch == "" {
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goarch = os.Getenv("GOARCH")
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}
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// Check that we are using the Docker-based build system if we should be.
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if goos == "linux" {
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if os.Getenv("GOLANG_SYS_BUILD") != "docker" {
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os.Stderr.WriteString("In the Docker-based build system, mkpost should not be called directly.\n")
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os.Stderr.WriteString("See README.md\n")
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os.Exit(1)
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}
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}
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b, err := ioutil.ReadAll(os.Stdin)
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if err != nil {
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log.Fatal(err)
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}
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// Intentionally export __val fields in Fsid and Sigset_t
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valRegex := regexp.MustCompile(`type (Fsid|Sigset_t) struct {(\s+)X__val(\s+\S+\s+)}`)
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b = valRegex.ReplaceAll(b, []byte("type $1 struct {${2}Val$3}"))
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// Intentionally export __fds_bits field in FdSet
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fdSetRegex := regexp.MustCompile(`type (FdSet) struct {(\s+)X__fds_bits(\s+\S+\s+)}`)
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b = fdSetRegex.ReplaceAll(b, []byte("type $1 struct {${2}Bits$3}"))
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// If we have empty Ptrace structs, we should delete them. Only s390x emits
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// nonempty Ptrace structs.
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ptraceRexexp := regexp.MustCompile(`type Ptrace((Psw|Fpregs|Per) struct {\s*})`)
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b = ptraceRexexp.ReplaceAll(b, nil)
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// Replace the control_regs union with a blank identifier for now.
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controlRegsRegex := regexp.MustCompile(`(Control_regs)\s+\[0\]uint64`)
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b = controlRegsRegex.ReplaceAll(b, []byte("_ [0]uint64"))
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// Remove fields that are added by glibc
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// Note that this is unstable as the identifers are private.
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removeFieldsRegex := regexp.MustCompile(`X__glibc\S*`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// Convert [65]int8 to [65]byte in Utsname members to simplify
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// conversion to string; see golang.org/issue/20753
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convertUtsnameRegex := regexp.MustCompile(`((Sys|Node|Domain)name|Release|Version|Machine)(\s+)\[(\d+)\]u?int8`)
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b = convertUtsnameRegex.ReplaceAll(b, []byte("$1$3[$4]byte"))
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// Convert [1024]int8 to [1024]byte in Ptmget members
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convertPtmget := regexp.MustCompile(`([SC]n)(\s+)\[(\d+)\]u?int8`)
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b = convertPtmget.ReplaceAll(b, []byte("$1[$3]byte"))
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// Remove spare fields (e.g. in Statx_t)
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spareFieldsRegex := regexp.MustCompile(`X__spare\S*`)
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b = spareFieldsRegex.ReplaceAll(b, []byte("_"))
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// Remove cgo padding fields
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removePaddingFieldsRegex := regexp.MustCompile(`Pad_cgo_\d+`)
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b = removePaddingFieldsRegex.ReplaceAll(b, []byte("_"))
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// Remove padding, hidden, or unused fields
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removeFieldsRegex = regexp.MustCompile(`\b(X_\S+|Padding)`)
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b = removeFieldsRegex.ReplaceAll(b, []byte("_"))
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// Remove the first line of warning from cgo
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b = b[bytes.IndexByte(b, '\n')+1:]
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// Modify the command in the header to include:
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// mkpost, our own warning, and a build tag.
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replacement := fmt.Sprintf(`$1 | go run mkpost.go
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// Code generated by the command above; see README.md. DO NOT EDIT.
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// +build %s,%s`, goarch, goos)
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cgoCommandRegex := regexp.MustCompile(`(cgo -godefs .*)`)
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b = cgoCommandRegex.ReplaceAll(b, []byte(replacement))
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// gofmt
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b, err = format.Source(b)
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if err != nil {
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log.Fatal(err)
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}
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os.Stdout.Write(b)
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}
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