mime.cache inaccessible after xdg-mime install with wrong umask

[Marcus]

If umask for instance is set to "u=rwx,g=rwx,o=" the /usr/share/mime/mime.cache file becomes inaccessible after "sudo xdg-mime install --mode system <file>" is run. xdg-mime sets umask to 022 for the xml-file that is being installed, but when update-mime-database is run, the umask is reset to the original value.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: xdg-utils 1.1.0~rc1-2ubuntu6 [modified: usr/bin/xdg-mime]
ProcVersionSignature: Ubuntu 3.2.0-33.52-generic 3.2.31
Uname: Linux 3.2.0-33-generic x86_64
ApportVersion: 2.0.1-0ubuntu15
Architecture: amd64
Date: Sun Nov 25 19:53:08 2012
Dependencies:

InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
MarkForUpload: True
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=sv_SE.UTF-8
 SHELL=/bin/bash
SourcePackage: xdg-utils
UpgradeStatus: No upgrade log present (probably fresh install)