dput GPG invocation doesn't work with spaces in working directory path

[Robin McCorkell]

When using dput to push to a PPA, if the current working directory has spaces in the path, then it will warn (but not error out) with

    gpg: can't open .....
    gpg: verify signatures failed: file open error

The problem lies in the Python script - the path passed to GPG needs to be quoted or otherwise escaped before being used to construct the GPG command. It appears the bug still exists in Debian git master: http://anonscm.debian.org/cgit/collab-maint/dput.git/tree/dput#n193

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: dput 0.9.6.4ubuntu1.1 [modified: usr/bin/dput]
ProcVersionSignature: Ubuntu 3.13.0-39.66-generic 3.13.11.8
Uname: Linux 3.13.0-39-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.5
Architecture: amd64
Date: Tue Nov 25 10:41:10 2014
InstallationDate: Installed on 2014-07-22 (125 days ago)
InstallationMedia: Karoshi 14.04 - Release amd64
PackageArchitecture: all
SourcePackage: dput
UpgradeStatus: No upgrade log present (probably fresh install)