将参数从PHP传递到远程Shell脚本

Question

I am executing a shell script located on a remote machine from a PHP script. So, let's say that PHP script runs on A and shell script runs on B (10.0.0.37).

I have the following code which runs well

$cmd = "ssh 10.0.0.37 /usr/tmp/script.sh";
exec($cmd, $output);

Now, I want to pass arguments to the shell script, preferably in JSON format.

The output of echo json_encode($arg) is as follows:

[{"original_name":"pdf_convert","changed_name":"pdf_convert_1"},{"original_name":"video_encode","changed_name":"video_encode_1"},{"original_name":"video_transcode","changed_name":"video_transcode_1"}]

I want to pass this as an argument to the shell script. So,

$data = json_encode($data);
$cmd = "ssh 10.0.0.37 /usr/tmp/script.sh $data";
exec($cmd, $output);

However, I see that the argument is not correctly read by the shell script. I tried putting single quotes around $data, didn't work. Also, tried using escapeshellarg($data) , still did not work.

Edit

The output of echo escapeshellarg($data) is

'[{"original_name":"pdf_convert","changed_name":"pdf_convert_1"},{"original_name":"video_encode","changed_name":"video_encode_1"},{"original_name":"video_transcode","changed_name":"video_transcode_1"}]'

Also, if there is any other format which can be parsed easily in a shell script, then I would lie to use that format (not necessarily JSON). I see that I may have to use 'jq' to parse json which needs me to install an additional package.

Answer 1

Bash isn't very good at accepting a JSON string in as arguments...

One way to get around bash trying to parse the arguments is for your php script to write the JSON string to a file, and for the bash script to parse that file with jq

Answer 2

I was able to use serilaize to send the json data. Below is the code.

$data = json_encode($arg)
$data = escapeshellarg($data);
$data = serialize($data);
$data = str_replace('"','\"',$data);
$cmd = "ssh 10.0.0.37 /usr/tmp/script.sh $data";

I can now get the data in the shell script.

Answer 3

PHP:

<?php

$json = '[{"original_name":"pdf_convert","changed_name":"pdf_convert_1"},{"original_name":"video_encode","changed_name":"video_encode_1"},{"original_name":"video_transcode","changed_name":"video_transcode_1"}]';

$cmd = $json;
$cmd = addslashes($cmd);
// addslashes does not escapes curly braces
$cmd = strtr($cmd, array('{' => '\\{', '}' => '\\}'));
$cmd = escapeshellarg($cmd);

$cmd = "ssh localhost echo $cmd";

echo "\n$cmd\n\n";

exec($cmd, $output);
var_dump($output)

Shell (/tmp/1.sh):

#!/bin/sh
echo "$1"

Shell Output:

ssh localhost /tmp/1.sh '[\{\"original_name\":\"pdf_convert\",\"changed_name\":\"pdf_convert_1\"\},\{\"original_name\":\"video_encode\",\"changed_name\":\"video_encode_1\"\},\{\"original_name\":\"video_transcode\",\"changed_name\":\"video_transcode_1\"\}]'

array(1) {
  [0]=>
  string(200) "[{"original_name":"pdf_convert","changed_name":"pdf_convert_1"},{"original_name":"video_encode","changed_name":"video_encode_1"},{"original_name":"video_transcode","changed_name":"video_transcode_1"}]"
}