Gzip decompression on txt (not tar) files?

Old Forum Archive
1

I see lots of examples that do something like

tarTree(resources.gzip('archive.tar.gz'))

so Gradle obviously has some support for gzip. However I’m trying to write a Gradle task that simply decompresses a flat gzipped text file, and I’m stuck.

Of course I can do

commandLine 'gunzip', '-k', 'textfile.gz'

and it works (at least under unix) but that’s hardly elegant.

In Ant I can do

<gunzip src="comparison_data/textfile.gz" dest="comparison_data/textfile.txt"/>

. Is there a Gradle equivalent?

2

As per the Gradle Build Language Reference and Javadoc, ‘project.resources.gzip(‘textfile.gz’).read()’ should give you an ‘InputStream’. Have you tried that?

3

Ah, beat me to it. Guess I’ll paste my example task in anyway, perhaps it can be instructive:

task gunzip << {
  file('otherFile.txt').text = resources.gzip('test.txt.gz').read().text
}
4

I was unaware of this .text functionality. However I suspect it may not be a good idea for me because some of the gzip files are huge (some 250MB, some larger.) Does resources.gzip(‘test.txt.gz’).read().text attempt to load the entire thing into memory?

I was expecting there would be some solution of the form

task unzipTheFile(type: Copy) {
 def gzipFile = ...
 def parentDir = ...
     from gzipFile
 into parentDir
}

but perhaps there is not. Everything I’ve tried along those lines has failed, but I’m new at this.

5

Yes, the file.text pattern would store all of the data in memory. You can always use streams instead to handle large files:

task gunzip << {
  file('targetUncompressedFile.txt').withOutputStream { os ->
    os << resources.gzip('sourceCompressedFile.txt.gz').read()
  }
 }

but as you note, it does not seem like there is a built in gradle way of dealing with single file gzip files.