/usr/share/fusionforge/plugins/scmhook/library/scmsvn/skel/post-commit/tail is in fusionforge-plugin-scmhook 6.0.3+20151023-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 | exit $error # svn will display stderr if non-zero
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