Bug#217862: dpkg doesn't check if package upgrade breaks versioned dependences
> On Mon, Oct 27, 2003 at 11:35:40PM +0300, Nikita V. Youshchenko wrote:
> > Package: dpkg
> > Version: 1.10.15
> > Severity: important
> >
> > This bug may be easilly reproduced.
> > Create dummy package p1, version 1, and dummy package p2, version 1,
> > that Depends: p1 (= 1).
> > Install both.
> > Now create package p2, version 2, and try to install it with dpkg -i,
> > without any --force.
> > Dpkg will silently do it, breaking the dependency for package p2.
>
> Either your example is backwards, or you haven't demonstrated any bug.
> Changing the version number of p2 does not break any dependencies in
> this scenario.
Sorry, I mean upgrading of p1.
The following command sequence demonstrates the bug.
I first install p2 then p1 only to ensure that dependency is there.
Dpkg leaves it unconfigured, so I install p2 anf then configure p1.
Then I upgrade p1, and dpkg silently does it, breaking the dependency for
p2.
Then I run apt-get install -f, just to show that dependency becomes
treally broken, and apt notices that.
nikita@sercond:/tmp/bug> mkdir p1_1 p1_2 p2
nikita@sercond:/tmp/bug> echo p1 > p1_1/p1
nikita@sercond:/tmp/bug> echo p1 > p1_2/p1
nikita@sercond:/tmp/bug> echo p2 > p2/p2
nikita@sercond:/tmp/bug> mkdir p1_1/DEBIAN
nikita@sercond:/tmp/bug> mkdir p1_2/DEBIAN
nikita@sercond:/tmp/bug> mkdir p2/DEBIAN
nikita@sercond:/tmp/bug> cat > p1_1/DEBIAN/control
Package: p1
Version: 1
Maintainer: nobody@nobody.org
Description: test package p1
Architecture: all
nikita@sercond:/tmp/bug> dpkg -b p1_1 p1_1.deb
dpkg-deb: building package `p1' in `p1_1.deb'.
nikita@sercond:/tmp/bug> cat > p1_2/DEBIAN/control
Package: p1
Version: 2
Maintainer: nobody@nobody.org
Description: test package p1
Architecture: all
nikita@sercond:/tmp/bug> dpkg -b p1_2 p1_2.deb
dpkg-deb: building package `p1' in `p1_2.deb'.
nikita@sercond:/tmp/bug> cat > p2/DEBIAN/control
Package: p2
Version: 1
Maintainer: nobody@nobody.org
Description: test package p2
Architecture: all
Depends: p1 (= 1)
nikita@sercond:/tmp/bug> dpkg -b p2 p2.deb
dpkg-deb: building package `p2' in `p2.deb'.
nikita@sercond:/tmp/bug> dpkg -i p2.deb
Selecting previously deselected package p2.
(Reading database ... 116504 files and directories currently installed.)
Unpacking p2 (from p2.deb) ...
dpkg: dependency problems prevent configuration of p2:
p2 depends on p1 (= 1); however:
Package p1 is not installed.
dpkg: error processing p2 (--install):
dependency problems - leaving unconfigured
Errors were encountered while processing:
p2
nikita@sercond:/tmp/bug> dpkg -i p1_1.deb
Selecting previously deselected package p1.
(Reading database ... 116505 files and directories currently installed.)
Unpacking p1 (from p1_1.deb) ...
Setting up p1 (1) ...
nikita@sercond:/tmp/bug> dpkg --configure p2
Setting up p2 (1) ...
nikita@sercond:/tmp/bug> dpkg -i p1_2.deb
(Reading database ... 116506 files and directories currently installed.)
Preparing to replace p1 1 (using p1_2.deb) ...
Unpacking replacement p1 ...
Setting up p1 (2) ...
nikita@sercond:/tmp/bug> apt-get install -f
Reading Package Lists... Done
Building Dependency Tree... Done
Correcting dependencies... Done
The following packages will be REMOVED:
p2*
0 upgraded, 0 newly installed, 1 to remove and 85 not upgraded.
Need to get 0B of archives.
After unpacking 0B of additional disk space will be used.
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