Allow svn:author to be changed for a subversion repository

Note to self: In order to allow changes to the author of an svn commit, the pre-revprop-change hook of the repository must be changed like this:

Insert the line

if [ "$ACTION" = "M" -a "$PROPNAME" = "svn:author" ]; then exit 0; fi

just below the existing, similar line that allows changing svn:log. Omitting the comments the script will then look like this:

#!/bin/sh
REPOS="$1"
REV="$2"
USER="$3"
PROPNAME="$4"
ACTION="$5"

if [ "$ACTION" = "M" -a "$PROPNAME" = "svn:log" ]; then exit 0; fi
if [ "$ACTION" = "M" -a "$PROPNAME" = "svn:author" ]; then exit 0; fi

echo "Changing revision properties other than svn:log is prohibited" >&2
exit 1

The script is located in the hooks subdirectory of the repository.
(Of course the above is for an svn repository located on a Linux server only.)

This change is required for the context menu entry in TortoiseSVN Log Messages window called “Edit Author” to work.