update-apt-xapian-index crashes with "InvalidArgumentError: Term too long (> 245): XSlibdevel"

/etc/cron.daily/apt:
Traceback (most recent call last):
  File "/usr/sbin/update-apt-xapian-index", line 104, in <module>
    indexer.rebuild(opts.pkgfile)
  File "/usr/lib/pymodules/python2.6/axi/indexer.py", line 688, in rebuild
    self.buildIndex(dbdir, generator)
  File "/usr/lib/pymodules/python2.6/axi/indexer.py", line 664, in buildIndex
    db.add_document(doc)
xapian.InvalidArgumentError: Term too long (> 245): XSlibdevel
 libqt4-svg (= 4:4.7.1-0ubuntu4), libqt4-xml (= 4:4.7.1-0ubuntu4),
 libqt4-sql (= 4:4.7.1-0ubuntu4), libqt4-script (= 4:4.7.1-0ubuntu4),
 libqt4-scripttools (= 4:4.7.1-0ubuntu4), libqt4-xmlpatterns (= 4:4.7.1-0ubuntu4),
 libqt4-qt3support (= 4:4.7.1-0ubuntu4), libqt4-designer (= 4:4.7.1-0ubuntu4),
 libqt4-help (= 4:4.7.1-0ubuntu4), libqt4-test (= 4:4.7.1-0ubuntu4),
 libqt4-declarative (= 4:4.7.1-0ubuntu4), qt4-qmake (= 4:4.7.1-0ubuntu4), libx11-dev

i just had a closer look, it always fail on libqt4-dev-dbgsym, which looks strange in my cache (the Section part), confirmed in http://ddebs.ubuntu.com/dists/natty/main/binary-i386/Packages

# apt-cache show libqt4-dev-dbgsym
Package: libqt4-dev-dbgsym
Priority: extra
Section: libdevel
 libqt4-svg (= 4:4.7.1-0ubuntu4), libqt4-xml (= 4:4.7.1-0ubuntu4),
 libqt4-sql (= 4:4.7.1-0ubuntu4), libqt4-script (= 4:4.7.1-0ubuntu4),
 libqt4-scripttools (= 4:4.7.1-0ubuntu4), libqt4-xmlpatterns (= 4:4.7.1-0ubuntu4),
 libqt4-qt3support (= 4:4.7.1-0ubuntu4), libqt4-designer (= 4:4.7.1-0ubuntu4),
 libqt4-help (= 4:4.7.1-0ubuntu4), libqt4-test (= 4:4.7.1-0ubuntu4),
 libqt4-declarative (= 4:4.7.1-0ubuntu4), qt4-qmake (= 4:4.7.1-0ubuntu4), libx11-dev
Installed-Size: 63668
Maintainer: Kubuntu Developers <email address hidden>
Original-Maintainer: Debian Qt/KDE Maintainers <email address hidden>
Architecture: amd64
Source: qt4-x11
Version: 4:4.7.1-0ubuntu4
Depends: libqt4-dev (= 4:4.7.1-0ubuntu4)
Conflicts: libqt4-dbg, libqt4-webkit-dbg, libqt4-xmlpatterns-dbg, qt4-demos-dbg
Filename: pool/main/q/qt4-x11/libqt4-dev-dbgsym_4.7.1-0ubuntu4_amd64.ddeb
Size: 18516782
MD5sum: 8f73a69762ec51bcbbfbf8a0d239d5e9
SHA1: ba2c6ecd4b6cbbb511a44af2010675a961eeb106
SHA256: 16b123dbc292412768f47cbb7d8d23d392718bdbde24e5c80160919919c6aba7
Description: debug symbols for package libqt4-dev
 Qt is a cross-platform C++ application framework. Qt's primary feature
 is its rich set of widgets that provide standard GUI functionality.
 .
 This package contains the header development files and development programs
 used for building Qt 4 applications.
Homepage: http://www.qtsoftware.com

I'll fix that in the ddeb creation, thanks! I keep the apt-xapian bug open, though, as this should be handled more gracefully.

Note that this is leaving very large caches behind in /var/cache/apt-xapian-index since it fails before cleanup...

qt4-x11 needs a rebuild after the fixed pkg-create-dbgsym was published.

This bug was fixed in the package pkg-create-dbgsym - 0.46

---------------
pkg-create-dbgsym (0.46) natty; urgency=low

  * tests/dhtest.whitespace: Add a comment line in the middle of the Depends:
    field. This reproduces the failure in LP #669430.
  * tests/run: Check that ddebs have a correct Section: field. This catches
    above bug.
  * pkg_create_dbgsym: Filter out comment lines from debian/control before
    processing. (LP: #669430)
  * Use 3.0 (native) source format.
  * debian/control: Bump Standards-Version to 3.9.1.
 -- Martin Pitt <email address hidden> Fri, 31 Dec 2010 15:20:49 +0100

The apt-xapian-index part isn't release critical.

This bug was fixed in the package qt4-x11 - 4:4.7.1-0ubuntu6

---------------
qt4-x11 (4:4.7.1-0ubuntu6) natty; urgency=low

  * No-change rebuild against fixed pkg-create-dbgsym. (LP: #669430)
 -- Martin Pitt <email address hidden> Fri, 31 Dec 2010 15:33:39 +0100