Option to ignore file extension and detect archive format by file content

[yene]

What would you like to have changed?

An option to ignore the file extension and detect the archive format based on the file content.

Why is this feature a useful, necessary, and/or important addition to this project?

Some of our customers deliver file formats with wrong extensions.

What alternatives are there, or what are you doing in the meantime to work around the lack of this feature?

No idea. Maybe a bash file -I to check the type.

[coolaj86]

There's now a --ext option which you can use set set the type explicitly, as per #252, released with v3.4.0.

I don't think that we're going to do any type of sniffing on files, but you could do something like this, if it's a script environment:

arc -ext rar unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz
arc -ext tar unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz
arc -ext tar.bz2 unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz
arc -ext tar.gz unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz
arc -ext tar.xz unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz
arc -ext zip unarchive ~/Downloads/bat-v0.15.4-x86_64-apple-darwin.tar.gz

[coolaj86]

You could also use file to help determine the file type by "magic headers":

file /tmp/evil/double-evil.rar
/tmp/evil/double-evil.rar: POSIX tar archive

[coolaj86]

@yene Are the proposed workarounds sufficient to close the issue?

[mholt]

This has been implemented for all formats in #302, which will become v4 soon. Please give it a try and let me know your thoughts!