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build.go
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build.go
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package acibuilder
import (
"archive/tar"
"io"
"os"
"path/filepath"
"github.com/sgotti/acibuilder/Godeps/_workspace/src/github.com/appc/spec/aci"
"github.com/sgotti/acibuilder/Godeps/_workspace/src/github.com/appc/spec/pkg/tarheader"
)
// function called to check if the given path should be excluded. path is
// relative to the root dir given to BuildWalker (ex. usr/bin/ls)
type ExcludeFunc func(path string, info os.FileInfo) (bool, error)
// BuildWalker creates a filepath.WalkFunc that walks over the given root
// (which is the rootfs of the ACI on disk, NOT the ACI layout on disk) and
// adds the files in the directory to the given ArchiveWriter
// If excludeFunc is not nil then it's called for every path
func BuildWalker(root string, files map[string]struct{}, excludeFunc ExcludeFunc, aw aci.ArchiveWriter) filepath.WalkFunc {
// cache of inode -> filepath, used to leverage hard links in the archive
inos := map[uint64]string{}
return func(path string, info os.FileInfo, err error) error {
if err != nil {
// Ignore Walk errors
return nil
}
if files != nil {
if _, ok := files[path]; !ok {
return nil
}
}
relpath, err := filepath.Rel(root, path)
if err != nil {
return err
}
if relpath == "." {
return nil
}
if excludeFunc != nil {
exclude, err := excludeFunc(relpath, info)
if err != nil {
return err
}
if exclude {
return nil
}
}
link := ""
var r io.Reader
switch info.Mode() & os.ModeType {
case os.ModeCharDevice:
case os.ModeDevice:
case os.ModeDir:
case os.ModeSymlink:
target, err := os.Readlink(path)
if err != nil {
return err
}
link = target
default:
file, err := os.Open(path)
if err != nil {
return err
}
defer file.Close()
r = file
}
hdr, err := tar.FileInfoHeader(info, link)
if err != nil {
panic(err)
}
// Because os.FileInfo's Name method returns only the base
// name of the file it describes, it may be necessary to
// modify the Name field of the returned header to provide the
// full path name of the file.
hdr.Name = filepath.Join("rootfs", relpath)
tarheader.Populate(hdr, info, inos)
// If the file is a hard link to a file we've already seen, we
// don't need the contents
if hdr.Typeflag == tar.TypeLink {
hdr.Size = 0
r = nil
}
if err := aw.AddFile(hdr, r); err != nil {
return err
}
return nil
}
}