[issue31020] Add support for custom compressor in tarfile

[insomniacslk]

insomniacslk added the comment:

The documentation should be updated to suggest that a custom file-like object 
can be passed to have custom compressors then.

However this sounds very hacky and definitely not a feature that can be easily 
passed to the user. Hence the reason for a cleaner, explicitly advertised 
interface.

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[issue31020] Add support for custom compressor in tarfile

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

You can pass a custom file object that implements a custom compression to the 
TarFile constructor. I don't see a need in other way.

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[issue31020] Add support for custom compressor in tarfile

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


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versions:  -Python 3.6

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[issue31020] Add support for custom compressor in tarfile

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Adding serhiy.storchaka who recently made changes to tarfile.

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nosy: +serhiy.storchaka

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[issue31020] Add support for custom compressor in tarfile

[Mariatta Wijaya]

Mariatta Wijaya added the comment:

Adding lars.gustaebel who is listed as maintainer for tarfile.

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nosy: +Mariatta, lars.gustaebel

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[issue31020] Add support for custom compressor in tarfile

[Mariatta Wijaya]

Changes by Mariatta Wijaya :


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stage:  -> patch review

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[issue31020] Add support for custom compressor in tarfile

[insomniacslk]

New submission from insomniacslk:

Tarfile would benefit from exposing custom compressors. At the moment the only 
way to use something that is not gzip/bzip/lzma is to separate the archiving 
and compression steps.

A possible approach is to pass a custom compression function to 
`tarfile.TarFile.open`. However the current interface is not clean enough to be 
exposed. I have made a very conservative change via a pull request on GitHub, 
see https://github.com/python/cpython/pull/2734 . Some additional 
considerations can be found there.

A further step could require a simplified interface that only involves file 
name, file-like object and compression level, and returns a file-like object to 
read the compressed data from. For example:

def my_compressor(name, fileobj=None, compresslevel=9):
# compression happens here
return filelike_object


This further step is not captured in the pull request, but I can iterate and 
update the diff.

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components: Library (Lib)
messages: 299017
nosy: insomniacslk
priority: normal
pull_requests: 2903
severity: normal
status: open
title: Add support for custom compressor in tarfile
type: enhancement
versions: Python 3.6, Python 3.7

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