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Subversion Checkout Hooks in RUBY!September - 04 - 2007 |
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Well, I promised to share these kinds of things with the community when i wrote this blog code, so here we go.. Basically, the problem is this: Subversion is great version control software. You can even configure it with hooks so that when someone commits to a repo you can write the file:
/repo_parent_path/repo/hooks/pre-commit.tmpland the script will be executed (like the tell-tale filename says) pre-commit. So, the hooks folder by default looks like this: ~/Desktop/repo/hooks $ ls post-commit.tmpl pre-lock.tmpl post-lock.tmpl pre-revprop-change.tmpl post-revprop-change.tmpl pre-unlock.tmpl post-unlock.tmpl start-commit.tmpl pre-commit.tmplWoah woah WOAH! What's missing up there? How about like HALF the BATTLE!! Where did pre-checkout and post-checkout go? Where did pre/post-udate go? NOWHERE! The never existed (cruelty!!) So now you're like, crap - what do i do with my poor ruby app, do i go back to my boss and tell him it can't be done? Nay, friends. It can be done.. Basically, you're going to take advantage of the apache2 CustomLog directive, located in mod_log_config apache2 module. Anyway, here's the snippet from my default site apache conf file. I'm using OS X, with a fink install of apache2, so the file I'm about to show you the excerpt from might be in a different location on your machine:
# excerpt from /sw/etc/apache2/sites-available/default
CustomLog "|/sw/var/www/svnhook_dispatch.rb" "%{SVN-ACTION}e\t%U" env=SVN-ACTION
Notice that I've put the CustomLog directive OUTSIDE the <Location> block. Also notice the pipe in the CustomLog line. This means (in roughtly translated english) pipe each new value from env SVN-ACTION to /sw/var/www/svnhook_dispatch.rb as it comes in. So, what does /sw/var/www/svnhook_dispatch.rb have in it? Good question:
#!/opt/local/bin/ruby
#########################################################
## This is my solution to the stupid lack of checkout ##
## hooks in subversion. I'm to lazy too submit a patch.##
## Someone should. Until then, enjoy. ##
#########################################################
# Yeah. It only works for SVNParentPath. Sorry :) repos_dir
# is equivalent to that dir. Dispatch dir is the dir of this file.
# equally, you could do `pwd`. But, i didn't.
repos_dir = "/Library/WebServer/localhost/adhearsion.com/repos/"
dispatch_dir = "/sw/var/www/"
while ln = gets
#Cleans it up a bit by splitting off some unnecessary spaces and data
params = ln.strip
params_ar = params.split("\t")
@svn_action = params_ar[0].split[0] #take off useless checkout dir
@svn_unix_name = params_ar[1].split('/')[2] #assign unix name
# Records in dispatch logfile, actually records a high-level log of
# Your subversion stuff in dispatch_log.txt
`echo #{params} >> #{dispatch_dir}dispatch_log.txt;`
#Path to the appropriate hook file
@hook_location = "#{repos_dir}#{@svn_unix_name}/hooks/pre-#{@svn_action}.tmpl"
# Call the script!
#script_out = `/Users/alexanderpilafian/localhost/adhearsion.com/repos/sublime/hooks/test_me.rb`
script_out = `#{@hook_location}`
#################################################################
## uncomment these lines to output some test debugging info ##
## to debug.out (You gotta touch debug.out first) ##
#################################################################
#outstr = "\nAction: #{@svn_action}\n" +
#"Repo: #{@svn_unix_name}\n" +
#"File: #{@hook_location}\n" +
#"Script Out: \r\n#{script_out}\n"
#`echo '#{outstr}' >> #{dispatch_dir}debug.out;`
end
So, most of this is comments, but basically it gets the new log entry, which looks plenty like
update / /svn/sickofthis/!svn/vcc/defaultAnd it gets the action and name of the repo. Then it calls the command /path_to_repo/hooks/pre-{action_name}.tmpl
where action_name will either be "update" or "checkout-or-export". Basically, once you get apache all configured and running right with it, it'll be just like SUBVERSION WAS WRITTEN RIGHT ALL ALONG! Also, please note that although all I've included in my log is the action and repo location, you can get a lot more information out of it. If you need it, look at the tutorial that does this with php at http://www.ryandesign.com/svnhookdispatcher/
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Genius is one per cent inspiration, ninety-nine per cent perspiration.
Paradise is exactly like where you are right now... only much, much better.
Look at all the sentences which seem true and question them.
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I ran the wrong kind of business, but I did it with integrity.
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