Pastebin: shell.fixing java alternatives after a wrong installation

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Plain text

Post date

2020-06-03 17:45

Publication Period

Unlimited

 set -e
 
 #so what happened, one installs with puppet openjdk 11, it doesn't work
 #and one simply uncomment the puppet code, without reverting
 #the installation, so the alternatives, that provide the link to the proper
 #java executables, are all messy. Those need to be fixed.
 
 LIST_OF_JAVA_ALTERNATIVES=(
     #not including the man pages and excluding those already done manually.
     #javac
     #javadoc
     #javap
     #jcmd
     #jconsole
     #jdb
     #jdeprscan
     #jdeps
     jexec
     jexec-binfmt
     jfr
     jhsdb
     jimage
     jinfo
     jjs
     jlink
     jmap
     jmod
     jps
     jrunscript
     jshell
     jstack
     jstat
     jstatd
     keytool
     pack200
     rmic
     rmid
     rmiregistry
     serialver
     unpack200
 )
 
 for JAVA_ALT_CMD in ${LIST_OF_JAVA_ALTERNATIVES[@]}; do
     #find if the program has the same name in the working java installation
     JAVA_CMD_PATH=$( find /opt/java/bin/ /opt/java/lib/ -iname "${JAVA_ALT_CMD}" | head -1 )
         #the two paths where things can be, given that the jre is also there but unwanted.
 
     #if the program is only once there add it as alternative (otherwise remove the alternative)
     #and the path is not too short (compared to the command name itself)
     if [[ ${#JAVA_CMD_PATH} -gt ${#JAVA_ALT_CMD} ]] && \
        [[ $( echo "${JAVA_CMD_PATH}" | wc -l ) -eq 1 ]]; then
         update-alternatives --install /usr/bin/$JAVA_ALT_CMD $JAVA_ALT_CMD $JAVA_CMD_PATH 2000000
     fi
 
     #remove the previous wrong installation
     # the installation was in one of those two locations
     # /usr/lib/jvm/java-11-openjdk-amd64/bin/cmdname
     # /usr/lib/jvm/java-11-openjdk-amd64/lib/cmdname
     update-alternatives --remove $JAVA_ALT_CMD /usr/lib/jvm/java-11-openjdk-amd64/bin/$JAVA_ALT_CMD
     update-alternatives --remove $JAVA_ALT_CMD /usr/lib/jvm/java-11-openjdk-amd64/lib/$JAVA_ALT_CMD
 
     echo "all fine? press enter to continue"
     read answer
 done