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28bc6ca6b9
When iterating on commit 3c1554e7f2 ("lib: Add new app2_class field
for classifying applications") in early versions I was accidentally
passing NULL to match(). Unexpectedly this returned 1 (ie. matching).
This happened because we did not correctly handle other errors apart
from PCRE2_ERROR_NOMATCH from pcre2_match.
Emit a debug message when this happens, and return no match.
To test this I ran these commands, and there was no output:
$ make && LIBGUESTFS_DEBUG=1 LIBGUESTFS_TRACE=1 make check
$ find -name '*.log' | xargs grep 'match.*unexpected error'
Libguestfs is tools and a library for accessing and modifying guest disk images. For more information see the home page: http://libguestfs.org/ For discussion, development, patches, etc. please use the mailing list: https://lists.libguestfs.org To find out how to build libguestfs from source, read: docs/guestfs-building.pod http://libguestfs.org/guestfs-building.1.html man docs/guestfs-building.1 Copyright (C) 2009-2025 Red Hat Inc. The library is distributed under the LGPLv2+. The programs are distributed under the GPLv2+. Please see the files COPYING and COPYING.LIB for full license information. The examples are under a very liberal license.