2018. augusztus 23., csütörtök 18:39:01 UTC+2 időpontban Remi Ferrand a
következőt írta:
>
> Hi everyone,
>
> This is my first message on this list so please apologize if this
> discussion has already showed up in the past.
>
> What I'm trying to do is quite simple.
>
> I do have a directory with files I want to share to a friend from my
> workstation.
> I would like him to:
> 1. point his web browser to an URL
> 2. be prompted for credentials (basic auth' is ok for my use-case)
> 3. get a prompt to download a TAR archive that contains my workstation's
> directory and files structure.
>
> My question is about the third point.
>
> I do not want the TAR archive to be built on my workstation and then be
> sent over HTTP once the archive contains all the files.
> Sometimes, my workstation does not have enough free disk space to store
> the temporary TAR archive and then send it.
> I would like the TAR archive to be generated on the fly and *streamed
> over HTTP* without any storage on my workstation disk.
>
> I've written a simple code here <https://github.com/riton/go-http-tar-dir>
> that does what I want.
> Everything seems to work.
>
> The code is written in hurry and I've used
>
> exec.Command
>
> to spawn the subprocess "tar cf -".
> I would like to avoid using the external tar util.
>
> I'm just starting in GoLang but I know that there is a package
> *archive/tar* that allows to create TAR archives.
>
> I can't figure out how *archive/tar* can be used in my use case (i.e not
> generating the full TAR archive on my workstation and only then send it
> once the archive is generated).
>
> If someone has already played with the *archive/tar* package and sees how
> I can use it to achieve what I want, any help would be appreciated in order
> to improve my GoLang skills
>
> Thanks !
>
> Cheers
>
> Rémi
>
>
Just use "tw := tar.NewWriter(w)" where w is your http.ResponseWriter (it
satisfies the io.Writer interface) after you checked everything and have
set w.Header.Set("Content-Type", "application/x-tar").
Then for each file (use filepath.Walk) tw.WriteHeader(th) (of
tar.FileInfoHeader(fi) of fi := fh.Stat())) then io.Copy(tw, fh):
tw := tar.NewWriter(w)
filepath.Walk(".", func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
}
th, err := tar.FileInfoHeader(info)
if err != nil {
return err
}
fh, err := os.Open(path)
if err != nil {
return err
}
defer fh.Close()
if err = tw.WriteHeader(th); err != nil {
return err
}
_, err = io.Copy(tw, fh)
return err
})
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