1

When I run apt-show-versions -a dwm command(apt-show-versions lists available package versions with distribution) then I see following output:

# apt-show-versions -a dwm
dwm:i386 6.0-4-martin install ok installed
dwm:i386 6.0-7 jessie http.debian.net
dwm:i386 6.0-4-martin newer than version in archive
# 

dwm was installed with custom-made deb package few years ago. However, why does apt-show-versions show that it is a newer than the version in the archive when I use jessie repos:

deb http://http.debian.net/debian jessie main contrib non-free
deb-src http://http.debian.net/debian jessie main contrib non-free

..and they should provide dwm version 6.0-7.

2

From Debian's perspective your private version is newer than archive's, but the reason isn't obvious. In Debian versions, the Debian revision can't contain hyphens, so 6.0-4-martin is parsed as Debian revision martin of upstream version 6.0-4, whereas 6.0-7 is parsed as Debian revision 7 of upstream version 6.0. When comparing versions, 6.0-4 is greater than 6.0...

You can check this using dpkg --compare-versions:

$ dpkg --compare-versions 6.0-4-martin gt 6.0-7
$ echo $?
0

which means dpkg considers 6.0-4-martin as greater than 6.0-7.

You should use + as the separator for private suffixes (6.0-4+martin or whatever's appropriate the next time), unless you're preparing a private backport in which case you should use ~.

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