I'm trying to decompress folder.tar.gz which was previously compressed with zstd, so I did:
unzstd folder.tar.gz.zst
Now if I try to decompress by using:
tar -xvf folder.tar.gz
It will decompress two big files inside some folder joined together.
Apparently the path which was compressed was: /opt/local/data/file1.log and file2.log.
After decompressing I get data folder joined by size of "file1 and file2.log".
That file is (reading the extensions in order) is a tar file compressed using gzip which itself is compressed by zstd.
Eg. double compressed: gzip inside zstd.
This is not common practice, maybe you changed the extension your self or the creator made an error?
The proper extension for a zstd compressed tar file is .tzst...
I would suggest to check the file using the file command
You should also be able to do tar -xvf folder.tzst when it actually is a "zstd compressed tar file" but just has wrong extensions, by just renaming the file...
tar.gz.zstd suggests you have a tar archive compressed with gz and the result compressed again with zstd.
To confirm, you can use file:
$ file file.tar.gz.zstd
file.tar.gz.zstd: Zstandard compressed data (v0.8+), Dictionary ID: None
$ unzstd < file.tar.gz.zstd | file -
/dev/stdin: gzip compressed data, from Unix
$ unzstd < file.tar.gz.zstd | gunzip | file -
/dev/stdin: POSIX tar archive (GNU)
To list the contents of the tar archive, you can use libarchive's bsdtar which should be able to detect the double-compression and decompress on the fly:
bsdtar tvf file.tar.gz.zstd
Or with other tar implementation, do it by hand:
unzstd < file.tar.gz.zstd | gunzip | tar tvf -
To extract, it's the same, you just replace t with x.
If you want to remove the redundant compression, you can do:
unzstd file.tar.gz.zstd
And get a file.tar.gz, or do:
unzstd < file.tar.gz.zstd | gunzip | zstd > file.tar.zstd
To get a file.tar.zstd.
