git archive -o something.tar.zst but file info just says "POSIX tar archive"

git archive -o something.tar.zst but file info just says "POSIX tar archive"

[Bagas Sanjaya]

Hi,

I noticed the following (possible bug?) when I tried to create zstd tar 
archive (.tar.zst) with `git archive`.

First, I created the plain tar archive with `git archive`, then extract 
and rearchive to zstd tar achive:

```
(on the repo)

$ git archive -o /tmp/something.tar --prefix=something/ HEAD

(outside the repo, on /tmp)

$ tar xvf something.tar
$ tar --zstd -c -v -f something.tar.zst something/
```

I checked that the archive was indeed zstd tar archive:

```
$ file something.tar.zst
something.tar.zst: Zstandard compressed data (v0.8+), Dictionary ID: None
```

Now I created the same archive with `git archive` directly:

```
(on the repo)

$ git archive -o /tmp/something1.tar.zst --prefix=something/ HEAD
```

But that archive info (with `file`) was something different:

```
(outside the repo, on /tmp)
$ file something1.tar.zst
something1.tar.zst: POSIX tar archive
```

I expected that `something1.tar.zst` was proper zstd tar archive, and 
not plain archive like above.

-- 
An old man doll... just what I always wanted! - Clara

Re: git archive -o something.tar.zst but file info just says "POSIX tar archive"

[SZEDER Gábor]

On Sun, Oct 10, 2021 at 06:19:53PM +0700, Bagas Sanjaya wrote:
> I noticed the following (possible bug?) when I tried to create zstd tar
> archive (.tar.zst) with `git archive`.

> $ git archive -o /tmp/something1.tar.zst --prefix=something/ HEAD
> ```
> 
> But that archive info (with `file`) was something different:
> 
> ```
> (outside the repo, on /tmp)
> $ file something1.tar.zst
> something1.tar.zst: POSIX tar archive
> ```
> 
> I expected that `something1.tar.zst` was proper zstd tar archive, and not
> plain archive like above.

  $ git archive -h |grep -e ' -l'
      -l, --list            list supported archive formats
  $ git archive -l
  tar
  tgz
  tar.gz
  zip

Does it list zstd among the supported formats on your machine?

Re: git archive -o something.tar.zst but file info just says "POSIX tar archive"

[Bagas Sanjaya]

On 10/10/21 18.40, SZEDER Gábor wrote:
>    $ git archive -h |grep -e ' -l'
>        -l, --list            list supported archive formats
>    $ git archive -l
>    tar
>    tgz
>    tar.gz
>    zip
> 
> Does it list zstd among the supported formats on your machine?
> 

Oh, I forgot to add `tar.tar.zst` config option.

Now `git archive -l` lists:

tar
tgz
tar.gz
tar.zst
tar.bz2
tar.xz
zip

and the corresponding .gitconfig are:

tar.tar.zst.command=zstd -c
tar.tar.bz2.command=bzip2 -c
tar.tar.xz.command=xz -c

Thanks.

-- 
An old man doll... just what I always wanted! - Clara