Bug#1031674: python3-debian: DebFile().debcontrol() fails to get control file when not starting with ./

[Léa Raya DÉCORNOD]

Package: python3-debian
Version: 0.1.49
Severity: normal

Dear Maintainer,

Thanks for developing python-debian.

When control file is named 'control' instead of './control' in control
archive, debcontrol() in DefFile fails to open it raising :
KeyError: "filename './control' not found"

dpkg-deb --info do not complain on the same .deb file.

(cargo-deb produce such .deb files)

Steps to reproduce :
  cd /tmp
  sudo apt install cargo python3-debian
  cargo new testdeb
  sed -i '/^version/aauthors = ["foo at example.org"]' testdeb/Cargo.toml
  cd testdeb
  cargo install cargo-deb
  cargo deb
  dpkg-deb --info target/debian/*.deb
  python3 -c 'import sys; from debian import debfile; debfile.DebFile(sys.argv[1]).debcontrol()' target/debian/*.deb

Thanks,
-- 
Léa Raya DÉCORNOD

-- System Information:
Debian Release: bookworm/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 6.1.0-3-amd64 (SMP w/8 CPU threads; PREEMPT)
Kernel taint flags: TAINT_OOT_MODULE, TAINT_UNSIGNED_MODULE
Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE=fr
Shell: /bin/sh linked to /usr/bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages python3-debian depends on:
ii  python3          3.11.1-3
ii  python3-chardet  5.1.0+dfsg-2

Versions of packages python3-debian recommends:
ii  python3-apt  2.5.2+b1
ii  zstd         1.5.2+dfsg2-3

Versions of packages python3-debian suggests:
ii  gpgv  2.2.40-1

-- no debconf information