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Groovy executing shell commands
I have this groovy script:
def proc = "some bash command".execute()
//proc.out.close() // hm does not seem to be needed...
proc.waitFor()
if (proc.exitValue()) {
def errorMsg = proc.getErrorStream().text
println "[ERROR] $errorMsg"
} else {
println proc.text
}
That I use the execute various linux bash commands. Currently it works fine even without the proc.out.close() statement.
What is the purpose of proc.out.close() and why is it (not?) needed
proc.text is actually proc.getText()
form groovy api doc: Read the text of the output stream of the Process. Closes all the streams associated with the process after retrieving the text.
http://docs.groovy-lang.org/docs/latest/html/groovy-jdk/java/lang/Process.html#getText()
So, when using proc.text you don't need to call proc.out.close()
Related
I would like to run an external .bat file using groovy script in soapUI. also would like to use the output generated from the external file as the value for the header
here is the script that I am using to run the bat file
String line
def p = "cmd /c C:\\Script\\S1.bat".execute()
def bri = new BufferedReader (new InputStreamReader(p.getInputStream()))
while ((line = bri.readLine()) != null) {log.info line}
here is the content of the bat file
java -jar SignatureGen.jar -pRESOURCE -nRandomString -mGET -d/api/discussion-streams/metadata -teyJ0eXAiOiJKV1QiLCJhbGciOiJIUzUxMiJ9.eyJjbGllbnQiOiIxIiwicm9sZSI6IllGQURNSU4iLCJleHAiOjI3NTgzMjU2MDIsInRpIjo3MjAwNiwiaWF0IjoxNTU4MzI1NjAyLCJwZXJzb24iOiI1In0.bbci7ZBWmPsANN34Ris9H0-mosKF2JLTZ-530Rex2ut1kjCwprZr_196N-K1alFBH_A9pbG0MPspaDOnvOKOjA
The following code:
def p = "ls -la".execute()
def err = new StringBuffer()
def out = new StringBuffer()
p.waitForProcessOutput(out, err)
p.waitForOrKill(5000)
int ret = p.exitValue()
// optionally check the exit value and err for errors
println "ERR: $err"
println "OUT: $out"
// if you want to do something line based with the output
out.readLines().each { line ->
println "LINE: $line"
}
is based on linux, but translates to windows by just replacing the ls -la with your bat file invocation cmd /c C:\\Script\\S1.bat.
This executes the process, calls waitForProcessOutput to make sure the process doesn't block and that we are saving away the stdout and stderr streams of the process, and then waits for the process to finish using waitForOrKill.
After the waitForOrKill the process has either been terminated because it took too long, or it has completed normally. Whatever the case, the out variable will contain the output of the command. To figure out whether or not there was an error during bat file execution, you can inspect the ret and err variables.
I chose the waitForOrKill timeout at random, adjust to fit your needs. You can also use waitFor without a timeout which will wait until the process completes, but it is generally better to set some timeout to make sure your command doesn't execute indefinitely.
I am beginning to think my search skills are lacking.
I trying to find any articles on how with Groovy, to open an interactive process, read its output and then write to the process depending on the output text. All I can find is how printing, reading and writing with files. Nothing about how to Write to a interactive process.
The process is asking for a password
Write the password to process
Something like this if possible:
def process = "some-command.sh".execute()
process.in.eachLine { line ->
if (line.contains("enter password")) {
process.out.write("myPassword")
}
}
This here works reading from the process output:
def process = "some-command.sh".execute()
process.in.eachLine { line ->
println line
}
Though it stops when the process is asking for input. It does not print out the line with the question.
Edit: Found out why it did not print the line with the ask password. It was not a new line. The question was a simple print (not println). How do I read when there is not yet a new line?
I have been told expect can be used, but I am looking for a solution which does not require a dependency.
1.bat
#echo off
echo gogogo
set /P V=input me:
echo V=%V%
this script waits for input just after :
gogogo
input me:
this means that eachLine not triggered for input me because no new line after it
however the previous line gogogo could be caught
and following script works for gogogo but does not work for input me
groovy
def process = "1.bat".execute()
process.in.eachLine { line ->
if (line.contains("gogogo")) {
process.out.write("myPassword\n".getBytes("UTF-8"))
process.out.flush()
}
}
groovy2
probably this could be optimized.. following script works without new line:
def process = "1.bat".execute()
def pout = new ByteArrayOutputStream()
def perr = new ByteArrayOutputStream()
process.consumeProcessOutput(pout, perr) //starts listening threads and returns immediately
while(process.isAlive()){
Thread.sleep(1234)
if(pout.toString("UTF-8").endsWith("input me:")){
process.out.write("myPassword\n".getBytes("UTF-8"))
process.out.flush()
}
}
I need to run a python script in windows system using groovy script.
Example:
python.exe c:/main.py argument1
I am new to groovy and I don't know, how to do it.
Please share me groovy syntax to run python as mentioned in the above example
I am preparing this script for jenkins.
so, "command".execute() is the right start.
But this command only starts a thread and you don't wait for the result.
try this code:
def task = "python main.py".execute()
task.waitFor()
println task.text
These lines start the execution, wait for it to finish and print the result.
To output already during execution for longer running tasks, I've written myself a small helper:
String.metaClass.executeCmd = { silent ->
//make sure that all paramters are interpreted through the cmd-shell
//TODO: make this also work with *nix
def p = "cmd /c ${delegate.value}".execute()
def result = [std: '', err: '']
def ready = false
Thread.start {
def reader = new BufferedReader(new InputStreamReader(p.in))
def line = ""
while ((line = reader.readLine()) != null) {
if (silent != false) {
println "" + line
}
result.std += line + "\n"
}
ready = true
reader.close()
}
p.waitForOrKill(30000)
def error = p.err.text
if (error.isEmpty()) {
return result
} else {
throw new RuntimeException("\n" + error)
}
}
This defines through meta programming a new method on String called executeCmd.
Put this on top of your file and then your line
"python c:/main.py".executeCmd()
This should show you all output during execution and it will help you to handle the paramaters the correcct way through the "cmd /c"-prefix. (If you just call execute on a string, you often run into problems with spaces and other characters in your command.
If you already have the parameters as a list and need some code which also runs on a *nix machine, try to call execute() on a list:
["python", "c:/main.py"].execute()
hope this helps
ps: http://mrhaki.blogspot.com/2009/10/groovy-goodness-executing-string-or.html
I'll apologise in advance, I'm new to groovy. The problem I have is I have 3 groovy scripts which perform different functionality, and I need to call them from my main groovy script, using the output from script 1 as input for script 2 and script 2's output as input for script 3.
I've tried the following code:
script = new GroovyShell(binding)
script.run(new File("script1.groovy"), "--p", "$var" ) | script.run(new File("script2.groovy"), "<", "$var" )
When I run the above code the first script runs successfully but the 2nd doesn't run at all.
Script 1 takes an int as a parameter using the "--p", "$var" code. This runs successfully in the main script using: script.run(new File("script1.groovy"), "--p", "$var" ) - Script 1's output is an xml file.
When I run script.run(new File("script2.groovy"), "<", "$var" ) on its own in the main groovy script nothing happens and the system hangs.
I can run script 2 from the command line using groovy script2.groovy < input_file and it works fine.
Any help would be greatly appreciated.
You cannot pass the < as an argument to the script as redirection is handled by the Shell when you run things from the command line...
Redirecting output from Scripts into other scripts is notoriously difficult, and basically relies on you changing System.out for the duration of each script (and hoping that nothing else in the JVM prints and messes up your data)
Better to use java processes like the following:
Given these 3 scripts:
script1.groovy
// For each argument
args.each {
// Wrap it in xml and write it out
println "<woo>$it</woo>"
}
linelength.groovy
// read input
System.in.eachLine { line ->
// Write out the number of chars in each line
println line.length()
}
pretty.groovy
// For each line print out a nice report
int index = 1
System.in.eachLine { line ->
println "Line $index contains $line chars (including the <woo></woo> bit)"
index++
}
We can then write something like this to get a new groovy process to run each in turn, and pipe the outputs into each other (using the overloaded or operator on Process):
def s1 = 'groovy script1.groovy arg1 andarg2'.execute()
def s2 = 'groovy linelength.groovy'.execute()
def s3 = 'groovy pretty.groovy'.execute()
// pipe the output of process1 to process2, and the output
// of process2 to process3
s1 | s2 | s3
s3.waitForProcessOutput( System.out, System.err )
Which prints out:
Line 1 contains 15 chars (including the <woo></woo> bit)
Line 2 contains 18 chars (including the <woo></woo> bit)
//store standard I/O
PrintStream systemOut = System.out
InputStream systemIn = System.in
//Buffer for exchanging data between scripts
ByteArrayOutputStream buffer = new ByteArrayOutputStream()
PrintStream out = new PrintStream(buffer)
//Redirecting "out" of 1st stream to buffer
System.out = out
//RUN 1st script
evaluate("println 'hello'")
out.flush()
//Redirecting buffer to "in" of 2nd script
System.in = new ByteArrayInputStream(buffer.toByteArray())
//set standard "out"
System.out = systemOut
//RUN 2nd script
evaluate("println 'message from the first script: ' + new Scanner(System.in).next()")
//set standard "in"
System.in = systemIn
result is: 'message from the first script: hello'
In Python I can execute arbitrary code using exec(string). How can I do this in Groovy? I'd like the code to execute in the context of my currently running application, not as if I were using the Groovy shell.
To execute a command-line program dynamically in Groovy:
"cmdstring".execute().text
You can also execute some Groovy code wrapped in a String with:
def myGroovyCode = 'println "hi"'
Eval.me(myGroovyCode) //prints hi
See http://groovy.codehaus.org/api/groovy/util/Eval.html
You can also pass in your current context parameters via the binding mechanism to the Groovy Shell.
def myname = 'Inigo Montoya'
def binding = new Binding( [ myname:myname ] )
new GroovyShell( binding ).evaluate( 'println "My Name is " + myname' )