f19619ef9f
This commit adds a new environment package that manages all calls to the underlying operating system.
90 lines
1.9 KiB
Go
90 lines
1.9 KiB
Go
// Package targz provides facilities for packaging tar.gz files
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package targz
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import (
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"archive/tar"
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"compress/gzip"
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"io"
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"io/fs"
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"path/filepath"
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"github.com/FAU-CDI/wisski-distillery/pkg/environment"
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)
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// Package packages the source directory into a 'tar.gz' file into destination.
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// If the destination already exists, it is truncated.
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//
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// onCopy, when not nil, is called for each file being copied into the archive.
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func Package(env environment.Environment, dst, src string, onCopy func(rel string, src string)) (count int64, err error) {
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// create the target archive
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archive, err := env.Create(dst, environment.DefaultFilePerm)
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if err != nil {
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return 0, err
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}
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defer archive.Close()
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// create a gzip writer
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zipHandle := gzip.NewWriter(archive)
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defer zipHandle.Close()
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// create a tar writer
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tarHandle := tar.NewWriter(zipHandle)
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defer tarHandle.Close()
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// and walk through it!
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err = env.WalkDir(src, func(path string, entry fs.DirEntry, err error) error {
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if err != nil {
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return err
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}
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// determine the relative path
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var relpath string
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relpath, err = filepath.Rel(src, path)
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if err != nil {
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return err
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}
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// call the oncopy!
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if onCopy != nil {
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onCopy(relpath, path)
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}
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// read mode etc
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info, err := entry.Info()
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if err != nil {
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return err
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}
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// FIXME: How do we handle
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// create a file info header!
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tInfo, err := tar.FileInfoHeader(info, relpath)
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if err != nil {
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return err
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}
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tInfo.Name = filepath.ToSlash(relpath)
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// write it!
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if err := tarHandle.WriteHeader(tInfo); err != nil {
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return err
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}
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// if it's not a regular file, we are done
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if !entry.Type().IsRegular() {
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return nil
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}
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// open the file
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handle, err := env.Open(path)
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if err != nil {
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return err
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}
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defer handle.Close()
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// and copy it into the archive
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ccount, err := io.Copy(tarHandle, handle)
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count += ccount
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return err
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})
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return
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}
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