When Rake goes "Ache!"

Ruby
1

What is the best way to set something to do when a Rake task fails?

I’d like something like:

task :migrate_safely => [:backup, :migrate] do
rescue
if :backup
:restore
end
end
end

Is there a way to do anything similar?

2

Robert J. wrote:

What is the best way to set something to do when a Rake task fails?

I’d like something like:

task :migrate_safely => [:backup, :migrate] do
rescue
if :backup
:restore
end
end
end

Is there a way to do anything similar?

Does something like this work …

$migrate_failed = false

task :default => :migrate_safely

task :backup do
puts “Backing Up”
end

task :migrate do
begin
puts “Migrating”
fail “Oops”
rescue
$migrate_failed = true
end
end

task :restore do
puts “Restoring”
end

task :migrate_safely => [:backup, :migrate] do
Rake::Task[:restore].invoke if $migrate_failed
puts “Migrated Safely”
end

3

Jim W. wrote:

end
end

Thanks - will try it out. Not all fails throw exceptions (right? it’s
considered a fail if sh “false”), but I can always catch that and throw
an exception manually.

–
Posted via http://www.ruby-forum.com/.
Wow! The famous Jim himself uses ruby-forum. Should quiet all those
who complain about it :slight_smile:

4

Robert J. wrote:

Jim W. wrote:

end
end

Thanks - will try it out. Not all fails throw exceptions (right? it’s
considered a fail if sh “false”), but I can always catch that and throw
an exception manually.

If the “sh” command fails, it will throw an exception that terminates
rake processing. So you shouldn’t have a problem with that.

change the fail line in the example to:

sh “ruby -e ‘exit(1)’”

to try it.

– Jim W.