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I have a Debian package with postinst script in it that create symlinks. When I try to install the .deb package with --root (since I want to change the location where the package should be installed), I get this error:

dpkg (subprocess): unable to execute installed post-installation script: No such file or directory
subprocess installed post-installation script returned error exit status 2

dpkg is trying to find the postinst script in /var/lib/dpkg/info. What I can't understand is that according to the dpkg man page, using --root option changes the admindir to newdir/var/lib/dpkg as well.Then why is it trying to find postinst script in /var/lib/dpkg/info/?

I tried creating another package that doesn't contain this maintainer script and installed it using the same -i --root=newdir option and that doesn't throw any error.

Please let me know how I can make this work.

Barun
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1 Answers1

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dpkg did find the postinst script in /your/root/var/lib/dpkg/info — it tried to run it. It looks like the problem is a missing loader: dpkg finds the postinst script but then gets a “No such file or directory” error when it tries to execute it because the interpreter program for the script is not present (e.g. it's a Python script and python-minimal isn't installed). With an alternative instdir, the interpreter must be present under the instdir (dpkg chroots to the instdir before running package scripts).

If the interpreter isn't provided by a package tagged Essential, make sure that your package depends on the package that provides the interpreter.

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Gilles 'SO- stop being evil'
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