Persisting file permissions in a tar.gz file with Ant & tar

Discovered an interesting issue recently where file permissions were not being preserved when Taring up a build with Ant.

The existing approach was to chmod the files as desired then simply tar them all up and hope for the best:

<tar destfile=”dist/${hudson.build.tag}.tar.gz” basedir=”dist/” compression=”gzip” />

This doesn’t work,  but if you use tarfileset and set the filemode you can explicitly set things as required like this:

<tar destfile=”dist/${hudson.build.tag}.tar.gz” longfile=”gnu” compression=”gzip”>

<tarfileset dir=”dist/” filemode=”755″>

<include name=”**/*scripts/*.sh” />

<include name=”**/somescript.ext” />

</tarfileset>

<tarfileset dir=”dist/”>

<include name=”**/*” />

<exclude name=”**/*scripts/*.sh” />

<exclude name=”**/somescript.ext” />

</tarfileset>

</tar>

Here I am adding the first two scripts with chmod 755, then adding everything else which will get the default/umask permissions. I exclude the previous files – not sure if that’s required or not but I don’t want to risk overwriting them.

Now when you gunzip and tar xvf the resulting build, you get the required permissions.

There’s more info and further examples in the Apache Ant Manual.

Cheers,

Don

3 thoughts on “Persisting file permissions in a tar.gz file with Ant & tar”

Leave a Reply

Your email address will not be published. Required fields are marked *