Hey Folks-
I spent the weekend working on a shell script builder DSL for
writing your capistrano tasks in ruby instead of putting shell script
snippets in strings to the run method.
I wrote about this on my blog with a call for some input on look and
feel and whatnot.
http://brainspl.at/articles/2007/01/22/shellscriptbuilder-for-capistrano
http://brainspl.at/shell_script_builder.tar.gz
Right now it is just a standalone library that generates shell
scripts. I haven't made the mechanism that will allow cap to upload
these scripts to the servers and execute them but thats an easy task.
I am going to try to rewrite all the standard cap recipes to use this
Builder instead of shell scripts.
The reasoning is that with this dsl you will not have to remember
what all the flags to bash's if statements are. And you also don';t
have to worry about shell escaping or the way capistrano escapes
commands itself.
I would love some feedback and thoughts from folks as to whether
they would use this or not.
Here is a small example:
script = shell do |sh|
sh.sudo.ln_nsf "foo/bar", "bar/bar"
sh.echo "some string" => "/path/to/log.txt"
sh.if :directory? => "some/dir" do |sub|
sub.rm_rf 'some/dir'
sub.ln_nsf "shared/foo", "some/dir"
sub.if_not :file? => 'foo' do |ssub|
ssub.mkdir_p "some/foo"
end
end
sh.unless :file? => 'foo/bario' do |sub|
sub.touch 'foo/bario'
end
sh.if :writable? => "some/file.txt" do |sub|
sub.echo "#{Time.now}" => 'some/file.txt'
end
sh.mkdir_p 'foo/bar'
sh.rm_rf 'foo/bar'
end
puts script
OUTPUT:
#!/bin/sh
sudo ln -nsf foo/bar bar/bar
echo "some string" >> /path/to/log.txt
if [ -d some/dir ]
then
rm -rf some/dir
ln -nsf shared/foo some/dir
if [ ! -a foo ]
then
mkdir -p some/foo
fi
fi
if [ ! -a foo/bario ]
then
touch foo/bario
fi
if [ -w some/file.txt ]
then
echo "#{time}" >> some/file.txt
fi
mkdir -p foo/bar
rm -rf foo/bar
Cheers-
-- Ezra Zygmuntowicz
-- Lead Rails Evangelist
-- [EMAIL PROTECTED]
-- Engine Yard, Serious Rails Hosting
-- (866) 518-YARD (9273)
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