Bug#866991: libcpan-meta-perl: uninstallable in unstable

[gregor herrmann]

On Mon, 03 Jul 2017 13:52:38 +0300, Niko Tyni wrote:

> > > - libcpan-meta-perl depends on perl which depends on perl-modules-5.24
> > > - libcpan-meta-perl breaks libparse-cpan-meta-perl (<< 1.4420)
> > > - perl-modules-5.24 provides libparse-cpan-meta-perl (= 1.4417.001)
> > >
> > > => libcpan-meta-perl both depends on and breaks perl-modules-5.24.
> > 
> > I suspect the solution here is to lower the Breaks on
> > libparse-cpan-meta-perl to (<< 1.4417) or similar, since there is no
> > separate libparse-cpan-meta-perl package anymore (the last version in
> > Debian was 1.4414-1, removed[1] in 2015), and libcpan-meta-perl already
> > provides libparse-cpan-meta-perl itself.

Thanks for the bug report and the analysis.
As libparse-cpan-meta-perl still exists in oldstable, I'd rather keep
a Breaks/Replaces relationship.

> Thanks. Lowering the Breaks seems OK to me though I haven't looked at
> this very deeply yet. Assuming the Breaks is mainly about file conflicts,
> even (<= 1.4414-1) would probably be OK.

Ack, Parse::CPAN::Meta was merged into libcpan-meta-perl.
And I wanted to be cautious and Breaks/Replaces it with the current
version, even if the separate package had a lower one.

(Which I got wrong BTW, because libcpan-meta-perl 2.150010-1 ships Parse::CPAN::Meta
2.150010; the 1.4420 seems to come from an older entry in Changes.)

I see two possibilities:
- lower the version in the Replaces/Breaks to <= 1.4414-1, as that's
  the last separateky packaged version un Debian; not as
  "theoretically clean" as breaking the "real" version but should be
  safe within the Debian universe and allows us to fix this now;
- wait a couple of weeks: when perl 5.26 enters unstable this
  problems fixes itself; but then the version in Breaks/Replaces and
  Provides is still arbitrary/wrong.

I tend to prefer the first solution but I'm happy to hear about
others.
 

For convenience, here's the diff which I just pushed to the git repo
on Alioth (with a slightly different version to also catch
theoretical 1.4414-1+localsomething versions):

#v+
diff --git a/debian/changelog b/debian/changelog
index afd9fec..05b8681 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -1,3 +1,16 @@
+libcpan-meta-perl (2.150010-2) UNRELEASED; urgency=medium
+
+  * Fix the versioned Provides of libparse-cpan-meta-perl.
+    The earlier version (1.4420) was taken from an old entry in Changes but we
+    effectively ship 2.150010.
+  * Lower the version in the Breaks/Replaces on libparse-cpan-meta-perl.
+    Take libparse-cpan-meta-perl's latest version in the archive to avoid a
+    breaks loop with perl-modules-5.24 which also provides
+    libparse-cpan-meta-perl.
+    Thanks to Sven Joachim for the bug report. (Closes: #866991)
+
+ -- gregor herrmann <gregoa at debian.org>  Mon, 03 Jul 2017 18:04:19 +0200
+
 libcpan-meta-perl (2.150010-1) unstable; urgency=medium

   * Team upload.
diff --git a/debian/control b/debian/control
index 83503e5..3571c0a 100644
--- a/debian/control
+++ b/debian/control
@@ -24,9 +24,9 @@ Depends: ${misc:Depends},
          perl (>= 5.17.1) | libcpan-meta-requirements-perl (>= 2.121),
          perl (>= 5.19.9) | libcpan-meta-yaml-perl (>= 0.011),
          perl (>= 5.21.5) | libjson-pp-perl (>= 2.27300)
-Breaks: libparse-cpan-meta-perl (<< 1.4420)
-Replaces: libparse-cpan-meta-perl (<< 1.4420)
-Provides: libparse-cpan-meta-perl (= 1.4420)
+Breaks: libparse-cpan-meta-perl (<< 1.4414+)
+Replaces: libparse-cpan-meta-perl (<< 1.4414+)
+Provides: libparse-cpan-meta-perl (= 2.150010)
 Description: Perl module to access CPAN distributions metadata
  Software distributions released to the CPAN include a META.json or, for older
  distributions, META.yml which describes the distribution, its contents, and
#v-


Cheers,
gregor

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