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Contents
require 'fileutils'
module Redwood
## wrap a nice interactive layer on top of anything that has a #lock method
## which throws a LockError which responds to #user, #host, #mtim, #pname, and
## #pid.
module InteractiveLock
def pluralize number_of, kind; "#{number_of} #{kind}" + (number_of == 1 ? "" : "s") end
def time_ago_in_words time
secs = (Time.now - time).to_i
mins = secs / 60
time = if mins == 0
pluralize secs, "second"
else
pluralize mins, "minute"
end
end
DELAY = 5 # seconds
def lock_interactively stream=$stderr
begin
Index.lock
rescue Index::LockError => e
stream.puts <<EOS
Error: the index is locked by another process! User '#{e.user}' on
host '#{e.host}' is running #{e.pname} with pid #{e.pid}.
The process was alive as of at least #{time_ago_in_words e.mtime} ago.
EOS
stream.print "Should I ask that process to kill itself (y/n)? "
stream.flush
success = if $stdin.gets =~ /^\s*y(es)?\s*$/i
stream.puts "Ok, trying to kill process..."
begin
Process.kill "TERM", e.pid.to_i
sleep DELAY
rescue Errno::ESRCH # no such process
stream.puts "Hm, I couldn't kill it."
end
stream.puts "Let's try that again."
begin
Index.lock
rescue Index::LockError => e
stream.puts "I couldn't lock the index. The lockfile might just be stale."
stream.print "Should I just remove it and continue? (y/n) "
stream.flush
if $stdin.gets =~ /^\s*y(es)?\s*$/i
FileUtils.rm e.path
stream.puts "Let's try that one more time."
begin
Index.lock
true
rescue Index::LockError => e
end
end
end
end
stream.puts "Sorry, couldn't unlock the index." unless success
success
end
end
end
end
Version data entries
20 entries across 20 versions & 1 rubygems