Shell provisioner - call shell scripts with arguments

[Larry Liang]

Hi,

I'm trying to invoke a shell script (install.sh) with some arguments (say the version of mongodb)

For example "script": "install.sh '2.4.14'", using "script" or "scripts". 

Not sure if this is possible with the latest version of Packer.

If not, can someone recommend a acceptable work-around. I'm thinking about maybe export some env vars, but it's kind of implicit and not very elegant and readable.

Cheers,

Larry

[Alvaro Miranda Aguilera]

Hello,

Happy  new year.

Yes, its possible, I will show you 3 ways, but I am sure are more.

You have 2 ways to run an script, one is inline and other is path. Path will copy the file and run it.

Inline will run the commands.

Path A. Feels natural:

So use file provisioner to copy the script.

use shell provisioner inline to run the script.

  "provisioners"             : [

{

    "type": "file",

    "source": "myawesomescript.sh",

    "destination": "/root"

},

{

    "type": "shell",

    "execute_command": "sh '{{ .Path }}'",

    "inline": [

       "bash /root/myawesomescript.sh arg1"

       ]

  }

],

Just make sure you are copying to a directory that does exist.

Do you see execute_command? is a powerful option.

Path B feels hacky, but 100% valid

  "provisioners"             : [

    {

      "type": "shell",

      "execute_command": "echo 'vagrant'| {{ .Vars }} sudo -E -S bash '{{.Path}}' arg1",

      "pause_before": "1s",

      "scripts": [

        "scripts/vagrant.sh"

      ]

    }]

Path C

OR, you could use:

create a variable arguments

  "variables": {

    "arguments": "arg1"

   }

And use

      "execute_command": "echo 'vagrant'| {{ .Vars }} sudo -E -S bash '{{.Path}}'  '{{user `arguments`}}'   " ,

Advantage of this one, is you can override that at run time.

packer build -var "argument=the_new_argument" template.json

Hope this helps.

Alvaro.

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