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archive.go
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archive.go
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package resource
import (
"os"
"path/filepath"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshcmd "github.com/cloudfoundry/bosh-utils/fileutil"
boshsys "github.com/cloudfoundry/bosh-utils/system"
bicrypto "github.com/cloudfoundry/bosh-cli/crypto"
)
type ArchiveImpl struct {
files []File
prepFiles []File
additionalChunks []string
releaseDirPath string
followSymlinks bool
fingerprinter Fingerprinter
compressor boshcmd.Compressor
digestCalculator bicrypto.DigestCalculator
cmdRunner boshsys.CmdRunner
fs boshsys.FileSystem
}
func NewArchiveImpl(
args ArchiveFactoryArgs,
releaseDirPath string,
fingerprinter Fingerprinter,
compressor boshcmd.Compressor,
digestCalculator bicrypto.DigestCalculator,
cmdRunner boshsys.CmdRunner,
fs boshsys.FileSystem,
) ArchiveImpl {
return ArchiveImpl{
files: args.Files,
prepFiles: args.PrepFiles,
additionalChunks: args.Chunks,
followSymlinks: args.FollowSymlinks,
releaseDirPath: releaseDirPath,
fingerprinter: fingerprinter,
compressor: compressor,
digestCalculator: digestCalculator,
cmdRunner: cmdRunner,
fs: fs,
}
}
func (a ArchiveImpl) Fingerprint() (string, error) {
fp, err := a.fingerprinter.Calculate(a.files, a.additionalChunks)
if err != nil {
return "", bosherr.WrapErrorf(err, "Fingerprinting source files")
}
return fp, nil
}
func (a ArchiveImpl) Build(expectedFp string) (string, string, error) {
stagingDir, err := a.fs.TempDir("bosh-resource-archive")
if err != nil {
return "", "", bosherr.WrapError(err, "Creating staging directory")
}
defer func() {
_ = a.fs.RemoveAll(stagingDir)
}()
for _, file := range a.files {
err := a.copyFile(file, stagingDir)
if err != nil {
return "", "", bosherr.WrapError(err, "Copying into staging directory")
}
}
stagingFp, err := a.buildStagingArchive(stagingDir).Fingerprint()
if err != nil {
return "", "", bosherr.WrapError(err, "Fingerprinting staged files")
}
if expectedFp != stagingFp {
return "", "", bosherr.Errorf(
"Expected source ('%s') and staging ('%s') fingerprints to match", expectedFp, stagingFp)
}
err = a.runPrepScripts(stagingDir)
if err != nil {
return "", "", bosherr.WrapError(err, "Running prep scripts")
}
archivePath, err := a.compressor.CompressFilesInDir(stagingDir)
if err != nil {
return "", "", bosherr.WrapError(err, "Compressing staging directory")
}
//generation of digest string
archiveSHA1, err := a.digestCalculator.Calculate(archivePath)
if err != nil {
_ = a.compressor.CleanUp(archivePath)
return "", "", bosherr.WrapError(err, "Calculating archive SHA1")
}
return archivePath, archiveSHA1, nil
}
func (a ArchiveImpl) runPrepScripts(stagingDir string) error {
for _, prepFile := range a.prepFiles {
// No need to copy into staging dir since we expect prep script to be in files
cmd := boshsys.Command{
Name: "bash",
Args: []string{"-x", prepFile.Path},
WorkingDir: stagingDir,
UseIsolatedEnv: false,
Env: map[string]string{
"BUILD_DIR": stagingDir,
"RELEASE_DIR": a.releaseDirPath,
},
}
_, _, _, err := a.cmdRunner.RunComplexCommand(cmd)
if err != nil {
return err
}
// Arguably we should not remove the prep script
err = a.fs.RemoveAll(filepath.Join(stagingDir, prepFile.RelativePath))
if err != nil {
return bosherr.WrapError(
err, "Removing prep scrpt from staging directory")
}
}
return nil
}
func (a ArchiveImpl) copyFile(sourceFile File, stagingDir string) error {
dstPath := filepath.Join(stagingDir, sourceFile.RelativePath)
dstDir := filepath.Dir(dstPath)
err := a.fs.MkdirAll(dstDir, os.ModePerm)
if err != nil {
return err
}
sourceDirStat, err := a.fs.Lstat(filepath.Dir(sourceFile.Path))
if err != nil {
return err
}
sourceDirMode := sourceDirStat.Mode()
isSourceDirSymlink := sourceDirStat.Mode()&os.ModeSymlink != 0
if isSourceDirSymlink && a.followSymlinks {
symlinkTarget, err := filepath.EvalSymlinks(filepath.Dir(sourceFile.Path))
if err != nil {
return err
}
statResult, err := a.fs.Lstat(symlinkTarget)
if err != nil {
return err
}
sourceDirMode = statResult.Mode()
}
err = a.fs.Chmod(dstDir, sourceDirMode)
if err != nil {
return err
}
sourceFileStat, err := a.fs.Lstat(sourceFile.Path)
if err != nil {
return err
}
isSymlink := sourceFileStat.Mode()&os.ModeSymlink != 0
sourceFilePath := sourceFile.Path
if isSymlink {
if !a.followSymlinks {
symlinkTarget, err := a.fs.Readlink(sourceFilePath)
if err != nil {
return err
}
return a.fs.Symlink(symlinkTarget, dstPath)
}
symlinkTarget, err := a.fs.ReadAndFollowLink(sourceFilePath)
if err != nil {
return err
}
sourceFilePath = symlinkTarget
}
err = a.fs.CopyFile(sourceFilePath, dstPath)
if err != nil {
return err
}
// Be very explicit about changing permissions for copied file
// Only pay attention to whether the source file is executable
return a.fs.Chmod(dstPath, getFilePerms(sourceFileStat))
}
func getFilePerms(stat os.FileInfo) os.FileMode {
if (stat.Mode() | 0100) == stat.Mode() {
return 0755
} else {
return 0644
}
}
func (a ArchiveImpl) buildStagingArchive(stagingDir string) Archive {
var stagingFiles []File
for _, file := range a.files {
stagingFiles = append(stagingFiles, file.WithNewDir(stagingDir))
}
// Initialize with bare minimum deps so that fingerprinting can be performed
return NewArchiveImpl(ArchiveFactoryArgs{Files: stagingFiles, Chunks: a.additionalChunks}, "", a.fingerprinter, nil, nil, nil, nil)
}