[Bug 1794383] Re: ubuntu-cpc project: Add a hack for git empty directory handling

[Robert C Jennings]

I'll give that a go, get it tested, and update this bug.

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Title:
  ubuntu-cpc project: Add a hack for git empty directory handling

Status in livecd-rootfs package in Ubuntu:
  New

Bug description:
  We use a LP build recipe that includes livecd-rootfs.
  We are moving from bzr to git due to other projects moving to git.
  When we import livecd-rootfs into git it does not commit empty
  directories into the git tree.  The livecd-build/ubuntu-
  cpc/includes.chroot/etc/network/interfaces.d/ directory is dropped
  when we do this import.

  Foundations team would also like to move the upstream repositories to
  git including for stable releases, and this change would need to be
  made as part of this.

  [Impact]

   * Importing the package and committing it to a git repository
     drops empty directories from the ubuntu-cpc/includes.chroot tree
   * Images built in the ubuntu-cpc project drop this directory which
     is a regression

  [Test Case]

   * Create a bare git repo,
   * Pull the livecd-rootfs from xenial-updates into the repo,
   * Commit the code to git
   * Use the committed code (fresh clone) to build the ubuntu-cpc project
   * Inspect the images to see if /etc/network/interfaces.d exists

  [Regression Potential]

   * Low.  This create a directory if it does or doesn't exist so builds from
     sources that include the empty directory should not be impacted.  The
     difference would be owner or permissions between the two methods (includes.chroot
     and the chroot hook) and my testing with this patch has shown that to
     be correct.

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