jstar extract failed with: Cannot run program "sh"

[dckc]

Hi. I'm trying to learn to use this tool. I followed INSTALL.md and got sbt assembly to work, but jstar extract fails as follows:

$ jstar extract
========================================
 extract phase
----------------------------------------
version: recent (fc85c50181b2b8d7d75f034800528d87fda6b654)
extracting spec.html...* Unexpected error occurred.
java.io.IOException: Cannot run program "sh" (in directory "null/ecma262"): error=2, No such file or directory
java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1128)
java.base/java.lang.ProcessBuilder.start(ProcessBuilder.java:1071)
scala.sys.process.ProcessBuilderImpl$Simple.run(ProcessBuilderImpl.scala:82)
scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang(ProcessBuilderImpl.scala:142)
scala.sys.process.ProcessBuilderImpl$AbstractBuilder.slurp(ProcessBuilderImpl.scala:158)
scala.sys.process.ProcessBuilderImpl$AbstractBuilder.$bang$bang(ProcessBuilderImpl.scala:118)
kr.ac.kaist.jstar.util.Useful$.executeCmd(Useful.scala:220)
kr.ac.kaist.jstar.util.Useful$.currentVersion(Useful.scala:229)
kr.ac.kaist.jstar.extractor.ECMAScriptParser$.preprocess(ECMAScriptParser.scala:61)
kr.ac.kaist.jstar.extractor.ECMAScriptParser$.apply(ECMAScriptParser.scala:23)
kr.ac.kaist.jstar.phase.Extract$.$anonfun$apply$4(Extract.scala:33)
kr.ac.kaist.jstar.util.Useful$.f0$lzycompute$1(Useful.scala:188)
kr.ac.kaist.jstar.util.Useful$.f0$1(Useful.scala:188)
kr.ac.kaist.jstar.util.Useful$.$anonfun$time$1(Useful.scala:190)
kr.ac.kaist.jstar.util.Useful$.time(Useful.scala:181)
kr.ac.kaist.jstar.util.Useful$.time(Useful.scala:190)
kr.ac.kaist.jstar.phase.Extract$.apply(Extract.scala:33)
kr.ac.kaist.jstar.phase.Extract$.apply(Extract.scala:13)
kr.ac.kaist.jstar.phase.PhaseObj.$anonfun$getRunner$1(Phase.scala:32)
kr.ac.kaist.jstar.phase.PhaseCons.$anonfun$getRunner$2(PhaseList.scala:34)
kr.ac.kaist.jstar.Command.$anonfun$apply$1(Command.scala:22)
kr.ac.kaist.jstar.JSTAR$.apply(JSTAR.scala:38)
kr.ac.kaist.jstar.Command.apply(Command.scala:22)
kr.ac.kaist.jstar.JSTAR$.main(JSTAR.scala:14)
kr.ac.kaist.jstar.JSTAR.main(JSTAR.scala)

environment:
git log shows that I checked out 950a32d

I'm running on Ubuntu LTS 20.04.3

$ python3 --version
Python 3.8.10

$ java -version
openjdk version "11.0.13" 2021-10-19
OpenJDK Runtime Environment (build 11.0.13+8-Ubuntu-0ubuntu1.20.04)
OpenJDK 64-Bit Server VM (build 11.0.13+8-Ubuntu-0ubuntu1.20.04, mixed mode, sharing

[jhnaldo]

Did you follow the environment setting guide in INSTALL.md?

I think that the problem might be caused by the absence of the environment variable $JSTAR_HOME.
Can you try it after following the environment setting?

[dckc]

Oops! Indeed, I neglected to set JSTAR_HOME.

It seems to work as documented:

$ jstar extract
========================================
 extract phase
----------------------------------------
version: recent (fc85c50181b2b8d7d75f034800528d87fda6b654)
extracting spec.html... (11,268 ms)
* grammar:
  - lexical production: 89
  - non-lexical production: 244
* algorithms:
  - incomplete: 281
  - complete: 2125
  - total: 2406
* intrinsics: 67
* symbols: 13
* aoids: 507
* incompleted steps: 471