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module Gitlab
module Git
module Storage
module ForkedStorageCheck
extend self
def storage_available?(path, timeout_seconds = 5)
status = timeout_check(path, timeout_seconds)
status.success?
end
def timeout_check(path, timeout_seconds)
filesystem_check_pid = check_filesystem_in_process(path)
deadline = timeout_seconds.seconds.from_now.utc
wait_time = 0.01
status = nil
while status.nil?
if deadline > Time.now.utc
sleep(wait_time)
_pid, status = Process.wait2(filesystem_check_pid, Process::WNOHANG)
else
Process.kill('KILL', filesystem_check_pid)
# Blocking wait, so we are sure the process is gone before continuing
_pid, status = Process.wait2(filesystem_check_pid)
end
end
status
end
# This will spawn a new 2 processes to do the check:
# The outer child (waiter) will spawn another child process (stater).
#
# The stater is the process is performing the actual filesystem check
# the check might hang if the filesystem is acting up.
# In this case we will send a `KILL` to the waiter, which will still
# be responsive while the stater is hanging.
def check_filesystem_in_process(path)
spawn('ruby', '-e', ruby_check, path, [:out, :err] => '/dev/null')
end
def ruby_check
<<~RUBY_FILESYSTEM_CHECK
inner_pid = fork { File.stat(ARGV.first) }
Process.waitpid(inner_pid)
exit $?.exitstatus
RUBY_FILESYSTEM_CHECK
end
end
end
end
end
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