![BUT
DOESNOTWORKONLINUX
Alternative script for /usr/bin/env
Without defining system variables
#!/bin/bash
ARGS=( $1 ) # separate $1 into multiple space-delimited arguments.
shift # consume $1
PROG=`which ${ARGS[0]}` # find path for executable
unset ARGS[0] # discard executable name
ARGS+=( "$@" ) # remainder of arguments preserved "as-is".
# iterate array and expand variables
declare -a PARAMS
for i in "${ARGS[@]}"
do
PARAMS=("${PARAMS[@]}" "`eval "echo $i"`")
done
exec $PROG "${PARAMS[@]}" # execute the command](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-12-320.jpg)
![EXECUTING
SHELLCOMMANDS
"mkdir foo".execute()
["mkdir", "my directory"].execute()](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-19-320.jpg)
![WORKINGDIR&
ENVIRONMENT
"ls".execute([], new File("/tmp"))
"env".execute(["VAR1=Test", "VAR2=Something"], new File("."))
"env".execute([*:System.env,
VAR1: 'Test'].collect{ k,v -> "$k=$v" }, new File("."))](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-20-320.jpg)
![PROCESSOUTPUT
Process process = "myCommand".execute()
def out = new StringBuffer()
def err = new StringBuffer()
process.waitForProcessOutput( out, err )
if( out.size() > 0 ) println out
if( err.size() > 0 ) println err
def p = "rm -f foo.tmp".execute([], tmpDir)
p.consumeProcessOutput() // Prevent blocking by small buffer
p.waitFor()](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-23-320.jpg)
![SHELLHELPERII
Process execute(String command) {
new ProcessBuilder(['sh', '-c', command])
.directory(dir)
.redirectErrorStream(redirectErrorStream)
.environment(env.collect{k,v -> "$k=$v"} as String[])
.start()
}
int call(String command, boolean consumeOutput = true) {
Process proc = execute(command)
if(consumeOutput)
proc.consumeProcessOutput()
if(timeout)
proc.waitForOrKill(timeout)
else
proc.waitFor()
return proc.exitValue()
}
def eachLine(String command, Closure action) {
execute(command).in.eachLine(action)
}
}](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-27-320.jpg)
![ASAMPLE
usage: MyScript [options] [args]
-?,--help usage information
--config <arg> A script for tweaking the configuration
-D <property=value> use value for given property
-s,--source <path> Aliases for '-source'
-source <path> Specify where to find the files
-v,--version version information](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-32-320.jpg)
![THECODEI
#!/usr/bin/env groovy
def cli = new CliBuilder(usage: 'MyScript [options] [args]')
cli.with {
source (args:1, argName: 'path', optionalArg: false,
'Specify where to find the files')
_ (longOpt: 'config', args:1, argName: 'arg', optionalArg: false,
'A script for tweaking the configuration')
s (longOpt: 'source', args:1, argName:'path', optionalArg: false,
"Aliases for '-source'")
'?' (longOpt: 'help', 'usage information')
v (longOpt: 'version', 'version information')
D (args: 2, valueSeparator: '=', argName: 'property=value',
'use value for given property')
}](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-33-320.jpg)
![@GRABANNOTATIONI
Annotatable everywhere
often seen at import statements
group (String)
Maven groupId or Ivy organization
module (String)
Maven artifactId or Ivy artifact
version (String)
literal
'1.1-RC3'
Ivy range
'[1.0, 2,0]' -> 1.0 or 2.0
'[2.1,)' -> 2.1 or greater
classifier (String)
'jdk15'
optional](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-37-320.jpg)
![MULTIPLEDEPENDENCIES
@Grapes([
@Grab(group='commons-primitives', module='commons-primitives',
version='1.0'),
@Grab(group='org.ccil.cowan.tagsoup', module='tagsoup', version='0.9.7')
])
class Example {
...
}](https://image.slidesharecdn.com/groovyontheshell-150416072427-conversion-gate02/85/Groovy-on-the-Shell-38-320.jpg)
Groovy on the Shell
- 1. GROOVYON THESHELL SHELLSCRIPTINGWITHGROOVY Alexander Klein /http://codecentric.de alexander.klein@codecentric.de 0
- 2. WHY?
- 8. ALEXANDER(SASCHA)KLEIN Principal Consultant codecentric AG Stuttgart Groovy, JavaFX, UI / UX Griffon committer alexander.klein@codecentric.de @saschaklein http://gplus.to/karfunkel
- 11. USINGTHEDEFAULT ENVIRONMENT #!/usr/bin/env groovy DEFININGTHECLASSPATH #!/usr/bin/env groovy -cp myjar.jar USINGSYSTEMVARIABLES #!/usr/bin/env groovy -cp ${HOME}/bin DEFININGSYSTEMVARIABLES #!/usr/bin/env VAR1=value1 VAR2=value2 groovy
- 12. BUT DOESNOTWORKONLINUX Alternative script for /usr/bin/env Without defining system variables #!/bin/bash ARGS=( $1 ) # separate $1 into multiple space-delimited arguments. shift # consume $1 PROG=`which ${ARGS[0]}` # find path for executable unset ARGS[0] # discard executable name ARGS+=( "$@" ) # remainder of arguments preserved "as-is". # iterate array and expand variables declare -a PARAMS for i in "${ARGS[@]}" do PARAMS=("${PARAMS[@]}" "`eval "echo $i"`") done exec $PROG "${PARAMS[@]}" # execute the command
- 13. GROOVYSERV
- 14. FASTERSTARTUP JVM process running in the background Scriptstart ~10-20 times faster
- 15. INSTALLATION WINDOWS GroovyServ is part of the Groovy Windows-Installer LINUX gvm install groovyserv MACOSX brew install groovyserv BINARYPACKAGE $ cd /tmp $ unzip groovyserv-1.0.0-bin.zip $ groovyserv-1.0.0-bin/bin/setup.sh export PATH=/tmp/groovyserv-1.0.0/bin:$PATH
- 17. WRITING SCRIPTS
- 18. RESTRICTIONS Classname == Filename to be found from other script
- 19. EXECUTING SHELLCOMMANDS "mkdir foo".execute() ["mkdir", "my directory"].execute()
- 20. WORKINGDIR& ENVIRONMENT "ls".execute([], new File("/tmp")) "env".execute(["VAR1=Test", "VAR2=Something"], new File(".")) "env".execute([*:System.env, VAR1: 'Test'].collect{ k,v -> "$k=$v" }, new File("."))
- 21. RESULTACCESS println "ls".execute().text println "cmd /c dir".execute().text "ls".execute().inputStream.eachLine { println it } "ls".execute().in.eachLine { println it } "myCommand".execute().err.eachLine { println it } def proc = new ProcessBuilder("myCommand").redirectErrorStream(true).start() proc.in.eachLine { println it }
- 22. PROCESSCONTROL Process process = "mkdir foo".execute() process.waitFor() int exitValue = process.exitValue() if(!exitValue) { //do your error-handling } if(!"mkdir foo".execute().waitFor()) { //do your error-handling } "grep pattern".execute().waitForOrKill(1000) def process = "myLongRunningCommand".execute() ... process.destroy()
- 23. PROCESSOUTPUT Process process = "myCommand".execute() def out = new StringBuffer() def err = new StringBuffer() process.waitForProcessOutput( out, err ) if( out.size() > 0 ) println out if( err.size() > 0 ) println err def p = "rm -f foo.tmp".execute([], tmpDir) p.consumeProcessOutput() // Prevent blocking by small buffer p.waitFor()
- 24. PIPING "less temp.sh".execute().pipeTo("grep Detected".execute()).text def proc1 = "less temp.sh".execute() def proc2 = "grep Detected".execute() proc1 | proc2 println proc2.text
- 25. WILDCARDS "ls *.java".execute() // won't work "sh -c ls *.java".execute() // Shell resolves the wildcard
- 26. SHELLHELPERI class Shell { final Map env = System.env File dir = new File('.') boolean redirectErrorStream = false long timeout = 5000 Shell env(Map env) { this.env.putAll(env); return this } Shell dir(File dir) { this.dir = dir; return this } Shell dir(String dir) { this.dir = new File(dir); return this } Shell redirectErrorStream(boolean redirectErrorStream = true) { this.redirectErrorStream = redirectErrorStream; return this } Shell timeout(int timeout = 5000) { this.timeout = timeout; return this }
- 27. SHELLHELPERII Process execute(String command) { new ProcessBuilder(['sh', '-c', command]) .directory(dir) .redirectErrorStream(redirectErrorStream) .environment(env.collect{k,v -> "$k=$v"} as String[]) .start() } int call(String command, boolean consumeOutput = true) { Process proc = execute(command) if(consumeOutput) proc.consumeProcessOutput() if(timeout) proc.waitForOrKill(timeout) else proc.waitFor() return proc.exitValue() } def eachLine(String command, Closure action) { execute(command).in.eachLine(action) } }
- 28. SHELLHELPERIII def shell = new Shell() shell.call("mkdir /tmp/groovy") shell.call("echo 123 >> /tmp/groovy/test") shell.dir("/tmp/groovy").call("echo $HOME >> test2") shell.eachLine("ls ."){ println "- $it -" } shell.eachLine("cat test2"){ println "- $it -" }
- 29. HELPFULLSTUFF ACCESSINGSYSTEM-VARIABLES println System.env.PWD ACCESSINGSYSTEM-PROPERTIES println System.properties.'user.dir' GETYOURPID import java.lang.management.* println ManagementFactory.runtimeMXBean.name.split('@').first().toInteger()
- 30. CLIBUILDER
- 31. PARSINGCOMMANDLINE ARGUMENTS DSL ontop of Apache Commons CLI !#/usr/bin/env groovy def cli = new CliBuilder(usage: 'MyScript') cli.with { v(longOpt: 'version', 'show version information') } def opt = cli.parse(args) if (!opt) System.exit(2) if (opt.v) { println "Version: 1.0.0" }
- 32. ASAMPLE usage: MyScript [options] [args] -?,--help usage information --config <arg> A script for tweaking the configuration -D <property=value> use value for given property -s,--source <path> Aliases for '-source' -source <path> Specify where to find the files -v,--version version information
- 33. THECODEI #!/usr/bin/env groovy def cli = new CliBuilder(usage: 'MyScript [options] [args]') cli.with { source (args:1, argName: 'path', optionalArg: false, 'Specify where to find the files') _ (longOpt: 'config', args:1, argName: 'arg', optionalArg: false, 'A script for tweaking the configuration') s (longOpt: 'source', args:1, argName:'path', optionalArg: false, "Aliases for '-source'") '?' (longOpt: 'help', 'usage information') v (longOpt: 'version', 'version information') D (args: 2, valueSeparator: '=', argName: 'property=value', 'use value for given property') }
- 34. THECODEII def opt = cli.parse(args) if (!opt) // usage already displayed by cli.parse() System.exit(2) if(opt.'?') cli.usage() else if (opt.v) println "Version: 1.0.0" else { if (opt.config) println "Configuration: $opt.config" if(opt.D) { println "Custom properties:" println opt.Ds.collate(2).collect{ it.join('=') }.join('n') } def home = System.properties.'user.dir' if (opt.s || opt.source) home = opt.s ?: opt.source println "Working on files:" opt.arguments().each println "$home/$it" }
- 36. GRAPE GROOVYADAPTABLEPACKAGINGENGINE @Grab(group='org.springframework', module='spring-orm', version='3.2.5.RELEASE') import org.springframework.jdbc.core.JdbcTemplate @Grab('org.springframework:spring-orm:3.2.5.RELEASE') import org.springframework.jdbc.core.JdbcTemplate Cachedirectory ~/.groovy/grape
- 37. @GRABANNOTATIONI Annotatable everywhere often seen at import statements group (String) Maven groupId or Ivy organization module (String) Maven artifactId or Ivy artifact version (String) literal '1.1-RC3' Ivy range '[1.0, 2,0]' -> 1.0 or 2.0 '[2.1,)' -> 2.1 or greater classifier (String) 'jdk15' optional
- 38. MULTIPLEDEPENDENCIES @Grapes([ @Grab(group='commons-primitives', module='commons-primitives', version='1.0'), @Grab(group='org.ccil.cowan.tagsoup', module='tagsoup', version='0.9.7') ]) class Example { ... }
- 39. REPOSITORIES Configuration in ~/.groovy/grapeConfig.xml Grape cache -> ~/.groovy/grapes Maven Local -> ~/.m2/repository JCenter (includes Maven Central) Codehaus.org IBiblio Java.net http://jcenter.bintray.com http://repository.codehaus.org http://www.ibiblio.org http://download.java.net/maven/2 @GrabResolver(name='restlet', root='http://maven.restlet.org/') @Grab(group='org.restlet', module='org.restlet', version='1.1.6')
- 41. GRABCONFIG @GrabConfig(systemClassLoader=true) @Grab(group='mysql', module='mysql-connector-java', version='5.1.6') GrabConfig systemClassLoader (boolean) using the System-ClassLoader initContextClassLoader (boolean) ContextClassLoader = CL of the current thread autoDownload (boolean) automatic downloading disableChecksums (boolean) checking checksums
- 42. PROXY-CONFIGURATION $ groovy -Dhttp.proxyHost=<host> -Dhttp.proxyPort=<port> -Dhttp.proxyUser=<user> -Dhttp.proxyPassword=<user> yourscript.groovy JAVA_OPTS = -Dhttp.proxyHost=<host> -Dhttp.proxyPort=<port> -Dhttp.proxyUser=<user> -Dhttp.proxyPassword=<user>
- 43. QUESTIONS? Alexander (Sascha) Klein codecentric AG Curiestr. 2 70563 Stuttgart tel +49.711.67400-328 mobile +49.172.5294020 alexander.klein@codecentric.de @saschaklein http://www.codecentric.de http://blog.codecentric.de