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Versions: 4
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Stored size: 1.33 KB
Contents
class Chef::Recipe
MARKER_DIR = "#{ENV['HOME']}/.install_markers"
#Regarding marker files:
#
#The idea here is you have a simple "signal" on disk that tells you when you've
#successfully run something, and you don't want to run it again if you don't have to.
#
#Also, the decision to rerun a unit of work becomes explicit - and owned by you.
#(it's not based on trusting a target program to respond in some way).
#You don't have to learn and keep up this "re-run" logic per unit of work / program
#
#Also, simply ls'ing the marker dir gives you interesting information all in once place -
#i.e. what markers are there and what are their timestamps?
#
#And reinstalls are easy - just rm the relevant marker file.
def run_unless_marker_file_exists(marker_file_name)
directory MARKER_DIR do
# owner WS_USER
recursive true
end
marker_path = File.join(MARKER_DIR, marker_file_name)
if File.exists?(marker_path)
log "skipping #{marker_file_name}: marker file found (#{marker_path}), detail: #{`ls -la #{marker_path}`.strip}"
else
log "no marker file found for #{marker_file_name} in #{MARKER_DIR}, running"
yield
execute "touching marker file #{marker_path} after successful run" do
# user WS_USER
command "touch #{marker_path}"
end
end
end
end
Version data entries
4 entries across 4 versions & 1 rubygems