[Pkg-rust-maintainers] Bug#912939: dpkg-dev: dpkg-shlibdeps should find and emit shared library packages even if it "can't extract name and version", relevant to rust

[Ximin Luo]

Package: dpkg-dev
Version: 1.19.2
Severity: important

Dear Maintainer,

Rust shared libraries look like this:

$ cat /var/lib/dpkg/info/libstd-rust-1.30\:amd64.shlibs 
[..]
libarena bf854c6df1c65266 libstd-rust-1.30 (>= 1.30.0+dfsg1)
[..]
libstd 5a15e25ec06d05ec libstd-rust-1.30 (>= 1.30.0+dfsg1)
[..]

$ ls -1 /usr/lib/x86_64-linux-gnu/*.so
[..]
/usr/lib/x86_64-linux-gnu/libarena-bf854c6df1c65266.so
[..]
/usr/lib/x86_64-linux-gnu/libstd-5a15e25ec06d05ec.so
[..]

dpkg-shlibdeps works for libraries whose hashes start with 0-9 but not a-f:

$ mkdir -p debian && touch debian/control # need to satisfy some checks
$ cat lol.c 
int main() {}
$ rm -f debian/substvars && gcc lol.c -lstd-5a15e25ec06d05ec && dpkg-shlibdeps a.out 2>/dev/null && cat debian/substvars
shlibs:Depends=libc6 (>= 2.2.5), libstd-rust-1.30 (>= 1.30.0+dfsg1)
$ rm -f debian/substvars && gcc lol.c -larena-bf854c6df1c65266 && dpkg-shlibdeps a.out 2>/dev/null && cat debian/substvars
shlibs:Depends=libc6 (>= 2.2.5)

Ideally it should Just Work in both cases.

It is perfectly OK for us if the Depends are (= $version) rather than (>= $version) - in fact the former is probably better.

X

-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (990, 'testing'), (500, 'unstable-debug'), (500, 'testing-debug'), (500, 'stable'), (300, 'unstable'), (100, 'experimental'), (1, 'experimental-debug')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.18.0-1-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_GB.utf8, LC_CTYPE=en_GB.utf8 (charmap=UTF-8), LANGUAGE=en_GB:en (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled

Versions of packages dpkg-dev depends on:
ii  binutils      2.31.1-7
ii  bzip2         1.0.6-9
ii  libdpkg-perl  1.19.2
ii  make          4.2.1-1.2
ii  patch         2.7.6-3
ii  perl          5.26.2-7+b1
ii  tar           1.30+dfsg-2
ii  xz-utils      5.2.2-1.3

Versions of packages dpkg-dev recommends:
ii  build-essential          12.5
ii  fakeroot                 1.23-1
ii  gcc                      4:8.2.0-1
ii  gcc-7 [c-compiler]       7.3.0-30
ii  gcc-8 [c-compiler]       8.2.0-9
ii  gnupg                    2.2.10-3
ii  gnupg2                   2.2.10-3
ii  gpgv                     2.2.10-3
ii  libalgorithm-merge-perl  0.08-3

Versions of packages dpkg-dev suggests:
ii  debian-keyring  2018.09.30

-- no debconf information