[Bug 1057886] [NEW] dpkg-source regression when a patch removes all files from a directory

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You have been subscribed to a public bug by Tyler Hicks (tyhicks):

I was recently working on a package update and created a patch which
deleted all files in a directory. When I tried to build the package, I
hit an unexpected dpkg-source error:

dpkg-source: info: using source format `3.0 (quilt)'
dpkg-source: info: building ruby1.9.1 using existing ./ruby1.9.1_1.9.3.194.orig.tar.gz
dpkg-source: info: building ruby1.9.1 in ruby1.9.1_1.9.3.194-1ubuntu1.debian.tar.gz
dpkg-source: info: building ruby1.9.1 in ruby1.9.1_1.9.3.194-1ubuntu1.dsc
 dpkg-genchanges -S >../ruby1.9.1_1.9.3.194-1ubuntu1_source.changes
dpkg-genchanges: not including original source code in upload
 dpkg-source --after-build ruby1.9.1-1.9.3.194
dpkg-source: error: failed to copy ruby1.9.1-1.9.3.194/.pc/20120927-rubygems_disable_upstream_certs.patch/lib/rubygems/ssl_certs/AddTrustExternalCARoot.pem to ruby1.9.1-1.9.3.194/lib/rubygems/ssl_certs/AddTrustExternalCARoot.pem: No such file or directory
dpkg-source: info: unapplying 20120927-rubygems_disable_upstream_certs.patch
dpkg-buildpackage: error: dpkg-source --after-build ruby1.9.1-1.9.3.194 gave error exit status 2
debuild: fatal error at line 1357:
dpkg-buildpackage -rfakeroot -d -us -uc -S failed

After doing some research, I found that it is a known bug and has a fix
applied in upstream dpkg. The Debian bug report also has a reproducer.

http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=683547

** Affects: dpkg (Ubuntu)
     Importance: Medium
         Status: Confirmed

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dpkg-source regression when a patch removes all files from a directory
https://bugs.launchpad.net/bugs/1057886
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