[Bug 1629644] Re: Trusty: failure to detect device with 0.4.9-3ubuntu7.5

[Louis Bouchard]

Hello,
The patches added between those two versions are not maintained in git but are quilt patches applied above the same source code found in multipath-tools_0.4.9.orig.tar.gz.

You could do something similar to a bisection by following these steps :

# sudo apt-get install ubuntu-dev-tools devscripts
# sudo apt-get build-dep multipath-tools
# mkdir bisect
# cd bisect
# pull-lp-source multipath-tools 0.4.9-3ubuntu7.4
# pull-lp-source -d multipath-tools 0.4.9-3ubuntu7.5
# debdiff *dsc > newpatches.patch
# cd multipath-tools-0.4.9
# patch -p1 < ../newpatches.patch
# quilt pop -a
# quilt push -a
# quilt pop 41

This will bring your source package to the patch level of
0.4.9-3ubuntu7.4. You can run the following to test that the created
package does work : build the binary packages with the current set of
quilt patches applied.

# dch -rm 
and add a suffix to the version number using the ~ marker. This will make sure that the version is lower than the 7.5 version in the archive

multipath-tools (0.4.9-3ubuntu7.5~test1) trusty; urgency=medium
# sudo fakeroot debian/rules binary

Install the packages with the 0.4.9-3ubuntu7.5~test1 version and verify
that your environment still works.

Then iterate over each new patch added between 0.4.9-3ubuntu7.4 and
0.4.9-3ubuntu7.5 by doing the following :

# quilt push
# dch -rm
multipath-tools (0.4.9-3ubuntu7.5~test2) trusty; urgency=medium
# fakeroot debian/rules binary

Install & test

When you get a package that doesn't work in your environment, it means
that the last patch applied is causing your failure. You can identify
the patch with :

# quilt applied | tail

The last one in the list is the patch you are looking for.

You may want to use LXC containers to create your build environment as
this will install a sensible amount of packages.

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https://bugs.launchpad.net/bugs/1629644

Title:
  Trusty: failure to detect device with 0.4.9-3ubuntu7.5

Status in multipath-tools package in Ubuntu:
  New

Bug description:
  When trying to detect a device with the latest 0.4.9-3ubuntu7.14 version, no device is detected.
  When downgrading to 0.4.9-3ubuntu7 everything works fine.
  See this console log for more detail: https://gist.github.com/amito/4108cd7ee895baecc9a6412e7c5fdeac

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