[Bug 1702204] Re: svn crashes when exporting a local checkout with root-relative svn externals

[Doug Brown]

FYI, I reported this bug upstream a few days after reporting it here,
and it has been fixed, but not released yet. It will be released in an
upcoming version of Subversion 1.9.x. It would be great if the fix could
be backported to 16.04. The fix is in these two commits:

http://svn.apache.org/viewvc?view=revision&revision=1802080
http://svn.apache.org/viewvc?view=revision&revision=1802316

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Title:
  svn crashes when exporting a local checkout with root-relative svn
  externals

Status in subversion package in Ubuntu:
  New

Bug description:
  Ubuntu 16.04, subversion 1.9.3-2ubuntu1

  I have an SVN repository that has an svn:external that is relative to
  the root of the repository using the ^/ syntax. For example:

  ^/test.txt test2.txt

  With this type of external, I'm running into a bug: I can't use svn
  export if I specify a particular svn revision with the -r option to
  the svn command. For example, if I type this command:

  svn export -r 4 /home/doug/Downloads/myrepo-co/ myreportest4

  It prints out the following error, and then crashes:

  svn: /build/subversion-yttRtj/subversion-1.9.3/subversion/libsvn_subr/dirent_uri.c:322: canonicalize: Assertion `*src != '/'' failed.
  Aborted (core dumped)

  If I remove the -r 4 option, it doesn't crash and everything works
  perfectly.

  ProblemType: Crash
  DistroRelease: Ubuntu 16.04
  Package: subversion 1.9.3-2ubuntu1
  ProcVersionSignature: Ubuntu 4.8.0-58.63~16.04.1-generic 4.8.17
  Uname: Linux 4.8.0-58-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.6
  Architecture: amd64
  CurrentDesktop: MATE
  Date: Mon Jul  3 18:51:01 2017
  ExecutablePath: /usr/bin/svn
  ExecutableTimestamp: 1457943789
  InstallationDate: Installed on 2017-07-04 (0 days ago)
  InstallationMedia: Ubuntu-MATE 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215)
  ProcCmdline: svn export -r 4 /home/doug/Downloads/myrepo-co/ myreportest4
  ProcCwd: /tmp
  Signal: 6
  SourcePackage: subversion
  StacktraceTop:
   raise () from /lib/x86_64-linux-gnu/libc.so.6
   abort () from /lib/x86_64-linux-gnu/libc.so.6
   ?? () from /lib/x86_64-linux-gnu/libc.so.6
   __assert_fail () from /lib/x86_64-linux-gnu/libc.so.6
   ?? () from /usr/lib/x86_64-linux-gnu/libsvn_subr-1.so.1
  Title: svn crashed with SIGABRT in raise()
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo

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