Error in unzipping a file from a python script running as daemon

Question

I am getting an error whenever i try to run following unzip command from a python script which is running as a daemon

Command :

unzip abcd.zip > /dev/null

Error

End-of-central-directory signature not found$ a zip file, or it 
constitutes one disk of a multi-part archive. In the latter case
the central directory and zipfile comment will be found on the last 
disk(s) of this archive

unzip:  cannot find zipfile directory in one of abcd.zip$
        abcd.zip.zip, and cannot find abcd.zip.ZIP, period.

Could anyone help me in this regard?

Thanks in advance.

Answer 1

Usually that would mean exactly what it says: that the file abcd.zip is not a valid ZIP file. Are you able to unzip abcd.zip as a normal user? If not, it would seem to have become corrupted. How did you get hold of it? Check for newline-mangling operations like ASCII-mode FTP.

Can you read the file with the built-in Python zipfile module? Handling files directly in Python is generally preferable to kicking it out onto the command line.

Answer 2

Validate the file first. This looks like a corrupted/invalid zip file.