Package: debtree
Version: 1.1.2
Severity: important
X-Debbugs-Cc: depaoli.re...@gmail.com
Dear Maintainer,
debtree fails with this error for a number of packages:
Can't use string ("") as a HASH ref while "strict refs" in use at
/usr/bin/debtree line 329.
Example test case:
debtree gcc-12-multilib:amd64
The root cause appears to lie within an unhandled third condition in
sub get_apt_pinfo {}
If the $pdata exists, but does neither meet the if ($show_installed ...), nor
the elsif (exists $$pdata ...), then the sub is returning
something that is interpreted as an "". The behaviour changes when a
final/closing empty else {} branch is added.
Note: This effect was also seen on KUbuntu 24.04 for
debtree gcc-13-x86-64-linux-gnu:amd64
Note: This bug may be related to
bug report #954795
Adding the empty else {} changes the error to
Use of uninitialized value in string eq at /usr/bin/debtree line 329.
The root cause for this appears to be within the
check_version {}
which doesn't check, if $$pinfo{VerStr} actually exists before trying to eq it
with $version.
Adding a check like this
sub check_version {
my ($package, $version) = @_;
my $pinfo = get_apt_pinfo($package, "");
if (exists ${$pinfo}{VerStr}) {
return ($$pinfo{VerStr} eq $version);
} else {
return 0;
}
}
seems to remove the error.
Note: This "uninitialized value" error can be reproduced directly on KUbuntu
24.04 by issuing
debtree g++-13-x86-64-linux-gnu:amd64
The HASH error stops debtree from creating a viable .gv file, as it seems to
stop in the middle of the process.
The corruption prevents any rendering.
This may be related to
bug report #1003856
I am not a Perl developer, but tried to make a best effort to try to narrow
down the root cause.
I hope this helps finding and fixing the issue.
Best regards,
Renzo de Paoli
Concordia Domi Foris Pax
-- System Information:
Debian Release: 12.9
APT prefers stable-updates
APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386
Kernel: Linux 6.1.0-31-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=en_IE.UTF-8, LC_CTYPE=en_IE.UTF-8 (charmap=UTF-8),
LANGUAGE=en_IE:en
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled
Versions of packages debtree depends on:
ii dctrl-tools 2.24-3+b1
ii libapt-pkg-perl 0.1.40+b2
ii perl 5.36.0-7+deb12u1
ii ucf 3.0043+nmu1+deb12u1
Versions of packages debtree recommends:
ii graphviz 2.42.2-7+deb12u1
debtree suggests no packages.
-- no debconf information
