srpmproc/internal/srpm.go

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2021-04-06 19:39:02 +00:00
// Copyright (c) 2021 The Srpmproc Authors
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
package internal
import (
"bytes"
"crypto/sha256"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"strings"
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"github.com/cavaliercoder/go-cpio"
"github.com/cavaliercoder/go-rpm"
"github.com/go-git/go-billy/v5/memfs"
"github.com/go-git/go-git/v5"
"github.com/go-git/go-git/v5/storage/memory"
"github.com/rocky-linux/srpmproc/internal/data"
)
type SrpmMode struct{}
func (s *SrpmMode) RetrieveSource(pd *data.ProcessData) *data.ModeData {
cmd := exec.Command("rpm2cpio", pd.RpmLocation)
cpioBytes, err := cmd.Output()
if err != nil {
log.Fatalf("could not convert to cpio (maybe rpm2cpio is missing): %v", err)
}
// create in memory git repository
repo, err := git.Init(memory.NewStorage(), memfs.New())
if err != nil {
log.Fatalf("could not init git Repo: %v", err)
}
// read the rpm in cpio format
buf := bytes.NewReader(cpioBytes)
r := cpio.NewReader(buf)
fileWrites := map[string][]byte{}
for {
hdr, err := r.Next()
if err == io.EOF {
// end of cpio archive
break
}
if err != nil {
log.Fatalln(err)
}
bts, err := ioutil.ReadAll(r)
if err != nil {
log.Fatalf("could not copy file to virtual filesystem: %v", err)
}
fileWrites[hdr.Name] = bts
}
w, err := repo.Worktree()
if err != nil {
log.Fatalf("could not get Worktree: %v", err)
}
// create structure
err = w.Filesystem.MkdirAll("SPECS", 0755)
if err != nil {
log.Fatalf("could not create SPECS dir in vfs: %v", err)
}
err = w.Filesystem.MkdirAll("SOURCES", 0755)
if err != nil {
log.Fatalf("could not create SOURCES dir in vfs: %v", err)
}
f, err := os.Open(pd.RpmLocation)
if err != nil {
log.Fatalf("could not open the file again: %v", err)
}
rpmFile, err := rpm.ReadPackageFile(f)
if err != nil {
log.Fatalf("could not read package, invalid?: %v", err)
}
var sourcesToIgnore []*data.IgnoredSource
for _, source := range rpmFile.Source() {
if strings.Contains(source, ".tar") {
sourcesToIgnore = append(sourcesToIgnore, &data.IgnoredSource{
Name: source,
HashFunction: sha256.New(),
})
}
}
branch := fmt.Sprintf("%s%d", pd.BranchPrefix, pd.Version)
return &data.ModeData{
Repo: repo,
Worktree: w,
RpmFile: rpmFile,
FileWrites: fileWrites,
Branches: []string{branch},
SourcesToIgnore: sourcesToIgnore,
}
}
func (s *SrpmMode) WriteSource(_ *data.ProcessData, md *data.ModeData) {
for fileName, contents := range md.FileWrites {
var newPath string
if filepath.Ext(fileName) == ".spec" {
newPath = filepath.Join("SPECS", fileName)
} else {
newPath = filepath.Join("SOURCES", fileName)
}
mode := os.FileMode(0666)
for _, file := range md.RpmFile.Files() {
if file.Name() == fileName {
mode = file.Mode()
}
}
// add the file to the virtual filesystem
// we will move it to correct destination later
f, err := md.Worktree.Filesystem.OpenFile(newPath, os.O_RDWR|os.O_CREATE|os.O_TRUNC, mode)
if err != nil {
log.Fatalf("could not create file %s: %v", fileName, err)
}
_, err = f.Write(contents)
if err != nil {
log.Fatalf("could not write to file %s: %v", fileName, err)
}
_ = f.Close()
// don't add ignored file to git
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if data.IgnoredContains(md.SourcesToIgnore, fileName) {
continue
}
_, err = md.Worktree.Add(newPath)
if err != nil {
log.Fatalf("could not add source file: %v", err)
}
}
// add sources to ignore (remote sources)
gitIgnore, err := md.Worktree.Filesystem.Create(".gitignore")
if err != nil {
log.Fatalf("could not create .gitignore: %v", err)
}
for _, ignore := range md.SourcesToIgnore {
line := fmt.Sprintf("SOURCES/%s\n", ignore)
_, err := gitIgnore.Write([]byte(line))
if err != nil {
log.Fatalf("could not write line to .gitignore: %v", err)
}
}
err = gitIgnore.Close()
if err != nil {
log.Fatalf("could not close .gitignore: %v", err)
}
}
func (s *SrpmMode) PostProcess(_ *data.ModeData) {}
func (s *SrpmMode) ImportName(pd *data.ProcessData, _ *data.ModeData) string {
return filepath.Base(pd.RpmLocation)
}