sequel_management.rake can rollback ALL migrations

[maxd]

git ls-tree --name-only origin/master #{migrations_path}/ command can fail with the following error:

fatal: unsafe repository ('/app' is owned by someone else)
To add an exception for this directory, call:

	git config --global --add safe.directory /app

In this case the STDERR will contains this error message but STDOUT will be empty (!). You can run the following script to reproduce this situation:

output = `git ls-tree --name-only origin/master ./`


puts
puts "success?=#{$?.success?}" 
puts "output=#{output}"

It will print:

fatal: not a git repository (or any of the parent directories): .git

success?=false
output=

So, now look at this code here:

...
original_migrations = `#{git_command}`.split.map { |path| File.basename(path) }
migrations_to_rollback = (migrator.applied_migrations - original_migrations).sort.reverse
...

In case of error the original_migrations variable will contains empty list of original migrations and migrations_to_rollback variable will contains all (!) migrations for rollback. So, this code will rollback all migrations in case of error.

I'm going to create PR and add error handling for abort this Rake task in case of error.