Auglua implementation of augeasproviders_shellvar

output.sh

$ ./shellvar.lua ensure=present target=/tmp/foo key=foo value=bar
Saved 1 file(s)

shellvar.lua

#!/home/rpinson/dev/hercules-team/augeas/src/augtool -Alf
args = {...}
params = {}

for i, a in ipairs(args) do
  a:gsub("([^=]+)=([^=]+)", function(k, v) params[k] = v end)
end

aug.transform("Shellvars.lns", params['target'], false)
aug.load()

aug.defnode("target", "/files" .. params['target'], nil)
resource_path = "$target/" .. params['key']

if ensure == "absent" then
  aug.rm(resource_path)
elseif ensure == "unset" then
  --- place it properly if it exists
  if (aug.matches("$target/@unset/*[. = '" .. params['key'] .. "']") == 0) then
    aug.set("$target/@unset[last()+1]/1", params['key'])
  end
else
  aug.set(resource_path, params['value'])
  if ensure == "exported" then
    aug.clear(resource_path .. "/export")
  end
end
aug.save()