SVN pre-commit hook for avoiding changes to tags subdirectories

Question

Is there anybody who has clear instructions on how to add a pre-commit hook that avoids changes to tags subdirectories?

I already searched the internet quite a bit.

Answer 1

Since the 1st answer didn't prevent add/suppr files, and prevented new tags creation, and many other where incomplete or buggy, I reworked it

Here is my pre-commit hook : Goals are :

• Disallow commits on tags (file addition/suppression/updates)
• Don't prevent creation of tags

--------- file "pre-commit" (put in repositories hooks folder) ---------

#!/bin/sh

REPOS="$1"
TXN="$2"

SVNLOOK=/usr/bin/svnlook

#Logs
#$SVNLOOK changed -t "$TXN" "$REPOS" > /tmp/changes
#echo "$TXN" > /tmp/txn
#echo "$REPOS" > /tmp/repos

# Committing to tags is not allowed
# Forbidden changes are Update/Add/Delete.  /W = non alphanum char  Redirect is necessary to get the error message, since regular output is lost.
# BUT, we must allow tag creation / suppression

$SVNLOOK changed -t "$TXN" "$REPOS" | /bin/grep "^A\W.*tags\/[0-9._-]*\/." && /bin/echo "Commit to tags are NOT allowed ! (Admin custom rule)" 1>&2 && exit 101
$SVNLOOK changed -t "$TXN" "$REPOS" | /bin/grep "^U\W.*tags\/[0-9._-]*\/." && /bin/echo "Commit to tags are NOT allowed ! (Admin custom rule)" 1>&2 && exit 102
$SVNLOOK changed -t "$TXN" "$REPOS" | /bin/grep "^D\W.*tags\/[0-9._-]*\/." && /bin/echo "Commit to tags are NOT allowed ! (Admin custom rule)" 1>&2 && exit 104

# All checks passed, so allow the commit.
exit 0;

--------- end of file "pre-commit" ---------

Also, I made 2 shell scripts to copy my hook in every project of my svn : One to set a repo read only :

--------- script "setOneRepoTagsReadOnly.sh" ---------

#!/bin/sh

cd /var/svn/repos/svn
zeFileName=$1/hooks/pre-commit
/bin/cp ./CUSTOM_HOOKS/pre-commit $zeFileName
chown www-data:www-data $zeFileName
chmod +x $zeFileName

--------- end of file "setOneRepoTagsReadOnly.sh" ---------

And one calling it for every repo, to make all of my repos read only :

--------- file "makeTagsReadOnly.sh" ---------

#!/bin/shs/svn                                                                                                                                                                         
#Lists all repos, and adds the pre-commit hook to protect tags on each of them
find /var/svn/repos/svn/ -maxdepth 1 -mindepth 1 -type d -execdir '/var/svn/repos/svn/setOneRepoTagsReadOnly.sh' \{\} \;

--------- end of file "makeTagsReadOnly.sh" ---------

I execute thoses scripts directly from the svn "root" (/var/svn/repos/svn, in my case). Btw, a cron task could be set to automatically modify new repos by executing thoses scripts daily

Hope it helps.