Puppet exec unless file exists. It doesn't even cause Because the Exec requires the File to (conditionally) be applied first, its own unless parameter would not be evaluated in time to affect that, even if there were a way This type of issue is not meant to be solved in puppet code, the code operates on a known state. txt', exec will not run if /a/file. I am trying to figure out how to make my puppet module work such I need to test if file exists on the client, if it does, then copy another file over. If it exists puppet will response with a string containing the path to the file or directory. Puppet version is 3. I am trying to create Puppet exec that would only execute if certain Windows registry value does not exist. And, since that file will no longer exist after the first reboot, subsequent puppet runs would Anyway with an exec I cannot say "deploy those resources (say a firewall rule) only if this file exists", or at least I cannot see how I can build it. Resource declarations are not “commands”. They This works fine for simple tasks, but once your exec pile gets complex enough that you really have to think to understand what's happening, you should consider developing a custom On linux and puppet >3. What Actually happens: The file resource If the if condition fails, Puppet moves on to the elsif condition (if one exists). txt file is present in a particular directory. For this a fact in this case helps as I can then treat it as a exec command unless directory exists in puppet Asked 12 years ago Modified 10 years, 10 months ago Viewed 7k times If the file does not exist then the Exec succeeds without running /bin/true. The onlyif and unless commands There are some parameters to the exec type that you could use, such as creates, onlyif and unless. Using onlyif allows you to use the return value of one or more commands as your execution criteria; run the I have the following file resource in my puppet manifest: file { 'example. If all the conditions fail, (For example, apt-get update. I will mention this is a less-than-ideal way to manage Windows servers as it has drawbacks, but it is very much supported in . However, the pseudocode you have above has the execs in your initial if block being run every time Functions run on the master, not agent (unless you're using 'apply', like running masterless); you'd need a fact to test if the file exists on the agent side, which is easy to do with an external fact. So, your command is going to execute unless the result of test -e /tmp/some_file is success (exit code 0), that is, the file exists. That is a direct consequence I'm trying to write a function in puppet that will do a fail if the passed directory path does not exist. The proper way to do this is to create a custom fact, then code around that. Used this way this code can be a little cumbersome, but it's better than a provisioning failure. 8 try: command => '/bin/echo HI', unless => 'test -f /a/file. dat' path => "/path/to/example. The other thing you might need/want to do is move some files around so that you separate the data/config portion of docuwiki Puppet determines if file content is synchronized by computing a checksum for the local file and comparing it against the checksum_value parameter. 7 and OS is Windows 7. As long as the file / directory specified in creates exists puppet won't run the exec. Especially when your Puppet client isn't also a master and compiles the catalog for itself, the master cannot know whether files exist on the client without facts. I have a sequence of exec in my Puppet manifest: The first one downloads ZIP Explanation Sometimes a simple creates isn't enough to determine if an exec should run or not. I recently discovered that you can use the built-in function find_file for this. if File["/some/path"] always returns true, and if defined(File["/some/path"]) only returns true if the This will have puppet create a file if one doesn't exist, or else do nothing. You might want to consider using creates, which exists for this This is such a common requirement that puppet has a single property that "does the right thing". Service['x'] will be applied either way, but if the physical service is already in its target state (stopped), then Puppet won't take Puppet replaces files that don't match what the puppet master says should be there. If you have /tmp/test with the content "this is a test" on the client, but the master says it should have the content I searched for a very long time an easy way to use exists conditions on files and directories. Then, the "onlyif" test fails and the exec will remove the useless blank file. dat", owner => devops, mode => "0644", source => "/path/to What I expect to happen: The exec runs and exits because the unless statement returns 0, so the file resource never runs and neither file is created in /tmp. txt exists. I am trying to use code like this: exec { 'e With that said, you can actually use Puppet to run PowerShell scripts as well. If the checksum_value parameter is Why not make it leave the file but just blanks after it's ran, you can make puppet make sure the file is there and then use other logic to put content in there? But, only deploy the scripts when certain file exists, one that would only exist on the first puppet run after build. If the file does not exist then do nothing. An unless statement takes a Boolean condition and an arbitrary block of Puppet code, evaluates the condition, and if the condition is false, execute the code block. ) The exec has an onlyif, unless, or creates attribute, which prevents Puppet from running the command unless some condition is met. If both the if and elsif conditions fail, Puppet will execute the code in the else clause (if one exists).


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