Hi!

Additional information from Debian 9/stretch.

acerion@debian:~$ grep CODENAME /etc/os-release
VERSION_CODENAME=stretch
acerion@debian:~$ apt --version
apt 1.4.11 (amd64)



A. Reproduction with mongodb-dev

acerion@debian:~$ apt-get source mongodb-dev=2:1.1.2-5
Reading package lists... Done
Picking 'mongo-cxx-driver-legacy' as source package instead of 'mongodb-dev' NOTICE: 'mongo-cxx-driver-legacy' packaging is maintained in the 'Git' version control system at:
https://anonscm.debian.org/git/pkg-mongodb/mongo-cxx-driver-legacy.git -b debian
Please use:
git clone https://anonscm.debian.org/git/pkg-mongodb/mongo-cxx-driver-legacy.git -b debian
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 1,600 kB of source archives.
Get:1 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (dsc) [2,502 B]
Get:2 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (tar) [1,578 kB]
Get:3 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (diff) [19.8 kB]
Fetched 1,600 kB in 0s (3,108 kB/s)
dpkg-source: info: extracting mongo-cxx-driver-legacy in mongo-cxx-driver-legacy-1.1.2
[...]
acerion@debian:~$
acerion@debian:~$ rm -rf mongo-cxx-driver-legacy*
acerion@debian:~$
acerion@debian:~$ apt-get source mongodb-dev=1.1.2-5
Reading package lists... Done
Picking 'mongo-cxx-driver-legacy' as source package instead of 'mongodb-dev' NOTICE: 'mongo-cxx-driver-legacy' packaging is maintained in the 'Git' version control system at:
https://anonscm.debian.org/git/pkg-mongodb/mongo-cxx-driver-legacy.git -b debian
Please use:
git clone https://anonscm.debian.org/git/pkg-mongodb/mongo-cxx-driver-legacy.git -b debian
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 1,600 kB of source archives.
Get:1 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (dsc) [2,502 B]
Get:2 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (tar) [1,578 kB]
Get:3 http://archive.debian.org/debian stretch/main mongo-cxx-driver-legacy 1.1.2-5 (diff) [19.8 kB]
Fetched 1,600 kB in 0s (3,022 kB/s)
dpkg-source: info: extracting mongo-cxx-driver-legacy in mongo-cxx-driver-legacy-1.1.2
[...]

acerion@debian:~$ apt-cache show mongodb-dev
Package: mongodb-dev
Source: mongo-cxx-driver-legacy (1.1.2-5)
Version: 2:1.1.2-5
Installed-Size: 52
Maintainer: Debian MongoDB Maintainers <pkg-mongodb-maintainers@lists.alioth.debian.org>
Architecture: all
Depends: libmongoclient-dev
Description-en: MongoDB C++ Driver (transitional package)
This is a transitional dummy package and can be safely removed. Description-md5: be37fe697b6918d0a3d27af8da4cff89
Homepage: https://mongodb.github.io/mongo-cxx-driver/
Tag: devel::library, role::devel-lib
Section: libdevel
Priority: optional
Filename: pool/main/m/mongo-cxx-driver-legacy/mongodb-dev_1.1.2-5_all.deb
Size: 15852
MD5sum: 7debc7bbe9bf43a97b6fbeac9ae1f93c
SHA256: f359d5ca0d0652cc773fc83803830cc43546d68a1d6251262e84a548a791b4a1

acerion@debian:~$ apt-cache showsrc mongodb-dev
Package: mongo-cxx-driver-legacy
Binary: libmongoclient-dev, libmongoclient0, mongodb-dev
Version: 1.1.2-5
Maintainer: Debian MongoDB Maintainers <pkg-mongodb-maintainers@lists.alioth.debian.org>
Uploaders: Giulio Paci <giuliopaci@gmail.com>, Apollon Oikonomopoulos <apoikos@debian.org>, Laszlo Boszormenyi (GCS) <gcs@debian.org>
Build-Depends: debhelper (>= 9), devscripts, dh-buildinfo, dh-exec, libboost-dev, libboost-thread-dev, libgtest-dev, libjsoncpp-dev, libsasl2-dev, libssl-dev, tzdata, scons (>= 2.3.0)
Architecture: any all
Standards-Version: 3.9.8
Format: 3.0 (quilt)
Files:
67693c7bcc4af65b6b680cfbe8404b40 2502 mongo-cxx-driver-legacy_1.1.2-5.dsc
4c23a21360c4f8a2dbd71ffcfd46da3a 1577527 mongo-cxx-driver-legacy_1.1.2.orig.tar.gz
a3cd2af866b3442fd2b45df03349124e 19820 mongo-cxx-driver-legacy_1.1.2-5.debian.tar.xz
Vcs-Browser: https://anonscm.debian.org/cgit/pkg-mongodb/mongo-cxx-driver-legacy.git
Vcs-Git: https://anonscm.debian.org/git/pkg-mongodb/mongo-cxx-driver-legacy.git -b debian
Checksums-Sha256:
77b556271badcdae4a9c1477201738e95d7036c6af417bfd0fb5480e9fb59ac5 2502 mongo-cxx-driver-legacy_1.1.2-5.dsc
8c52cae798086c3e9d0e6fe488c3378601db858cc71944b6b83440d8b00298f4 1577527 mongo-cxx-driver-legacy_1.1.2.orig.tar.gz
18fb2538e238bd7a400ee1ec243712824fafed83cafc15f499180e076268fe96 19820 mongo-cxx-driver-legacy_1.1.2-5.debian.tar.xz
Homepage: https://mongodb.github.io/mongo-cxx-driver/
Package-List:
libmongoclient-dev deb libdevel optional arch=any
libmongoclient0 deb devel optional arch=any
mongodb-dev deb oldlibs extra arch=all
Directory: pool/main/m/mongo-cxx-driver-legacy
Priority: extra
Section: misc



One thing that caught my eye here is that binary package's version includes epoch, whereas source package's version doesn't include epoch. Perhaps this
is why "apt-get source" is able to fetch source of mongodb-dev in both cases.



B. Reproduction with vim package, which uses epoch in version string too

acerion@debian:~$ apt-get source vim=2:8.0.0197-4+deb9u7
Reading package lists... Done
NOTICE: 'vim' packaging is maintained in the 'Git' version control system at: https://anonscm.debian.org/cgit/pkg-vim/vim.git/
Please use:
git clone https://anonscm.debian.org/cgit/pkg-vim/vim.git/
to retrieve the latest (possibly unreleased) updates to the package.
Need to get 13.2 MB of source archives.
Get:1 http://archive.debian.org/debian-security stretch/updates/main vim 2:8.0.0197-4+deb9u7 (dsc) [3,040 B]
Get:2 http://archive.debian.org/debian-security stretch/updates/main vim 2:8.0.0197-4+deb9u7 (tar) [13.0 MB]
Get:3 http://archive.debian.org/debian-security stretch/updates/main vim 2:8.0.0197-4+deb9u7 (diff) [191 kB]
Fetched 13.2 MB in 3s (4,274 kB/s)
dpkg-source: info: extracting vim in vim-8.0.0197
[...]
acerion@debian:~$
acerion@debian:~$ rm -rf vim*
acerion@debian:~$
acerion@debian:~$ apt-get source vim=8.0.0197-4+deb9u7
Reading package lists... Done
E: Can not find version '8.0.0197-4+deb9u7' of package 'vim'
E: Unable to find a source package for vim

acerion@debian:~$ apt-cache show vim
Package: vim
Version: 2:8.0.0197-4+deb9u7
[...]

Package: vim
Version: 2:8.0.0197-4+deb9u3
[...]

acerion@debian:~$ apt-cache showsrc vim
Package: vim
Binary: vim-common, vim-gui-common, vim-runtime, vim-doc, vim-tiny, vim, vim-gtk, vim-gtk3, vim-nox, vim-athena, vim-gnome, xxd
Version: 2:8.0.0197-4+deb9u3
[...]

Package: vim
Binary: vim-common, vim-gui-common, vim-runtime, vim-doc, vim-tiny, vim, vim-gtk, vim-gtk3, vim-nox, vim-athena, vim-gnome, xxd
Version: 2:8.0.0197-4+deb9u7
[...]



As you can see, both binary and source packages include epoch in version string, and apt-get source is unable to find a package when queried for
version without epoch.



I don't know what is the correct behaviour of apt when dealing with
epoch numbers, but maybe the source of problem is the inconsistency in mongodb's version strings.

Kamil

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)