Package: apt
Version: 2.6.1
Severity: normal
X-Debbugs-Cc: benoit.sib...@orange.com

Dear Maintainer,

in /usr/lib/apt/apt.systemd.daily all vars defined by eval + apt-config
shell are pre-initialized, except the one used for daily_lock file.

    Cache="/var/cache/apt/archives/"
    eval $(apt-config shell Cache Dir::Cache::archives/d)

versus

    eval $(apt-config shell StateDir Dir::State/d)
    exec 3>${StateDir}/daily_lock

So if apt-config shell fails, $StateDir is undefined, daily_lock is
created in / instead of /var/lib/apt/

so you can have something like that:

-rw-r--r-- 1 root root 0 Nov  6 12:47 /daily_lock
-rw-r--r-- 1 root root 0 Nov  7 14:33 /var/lib/apt/daily_lock

ie. ineffective lock at some point and remaining useless file in /

An easy way to trigger the issue is to bork a bit apt configuration...
like a wrong instruction in /etc/apt/apt.conf.d/99bork for example.

# apt-config shell StateDir Dir::State/d
E: Syntax error /etc/apt/apt.conf:4: Extra junk at end of file


Probable fix: add a StateDir="/var/lib/apt" before (and/or activate set
-e to only use defined variables)


-- Package-specific info:

-- (no /etc/apt/preferences present) --


-- (no /etc/apt/preferences.d/* present) --


-- (no /etc/apt/sources.list present) --


-- (/etc/apt/sources.list.d/debian.sources present, but not submitted) --


-- System Information:
Debian Release: 12.2
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 6.2.0-36-generic (SMP w/20 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=C, LC_CTYPE=C.UTF-8 (charmap=UTF-8), LANGUAGE not set
Shell: /bin/sh linked to /usr/bin/dash
Init: unable to detect

Versions of packages apt depends on:
ii  adduser                 3.134
ii  debian-archive-keyring  2023.3+deb12u1
ii  gpgv                    2.2.40-1.1
ii  libapt-pkg6.0           2.6.1
ii  libc6                   2.36-9+deb12u3
ii  libgcc-s1               12.2.0-14
ii  libgnutls30             3.7.9-2
ii  libseccomp2             2.5.4-1+b3
ii  libstdc++6              12.2.0-14
ii  libsystemd0             252.17-1~deb12u1

Versions of packages apt recommends:
ii  ca-certificates  20230311

Versions of packages apt suggests:
pn  apt-doc                      <none>
pn  aptitude | synaptic | wajig  <none>
pn  dpkg-dev                     <none>
pn  gnupg | gnupg2 | gnupg1      <none>
pn  powermgmt-base               <none>

-- no debconf information


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