Fix shellcheck warnings of shellscripts

[simon04]

​https://www.shellcheck.net/ – ShellCheck, a static analysis tool for shell scripts

$ shellcheck linux/tested/usr/bin/josm 

In linux/tested/usr/bin/josm line 7:
ALTERNATIVE_JDK="`readlink -n -f /etc/alternatives/java`"
                 ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
ALTERNATIVE_JDK="$(readlink -n -f /etc/alternatives/java)"


In linux/tested/usr/bin/josm line 10:
ARCH="`dpkg --print-architecture 2> /dev/null || true`"
      ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.

Did you mean: 
ARCH="$(dpkg --print-architecture 2> /dev/null || true)"


In linux/tested/usr/bin/josm line 16:
|| dpkg --get-selections 'openjdk-*-jre:$ARCH' | grep install$ > /dev/null ; then
                         ^-------------------^ SC2016: Expressions don't expand in single quotes, use double quotes for that.


In linux/tested/usr/bin/josm line 33:
    . /etc/default/josm
      ^---------------^ SC1091: Not following: /etc/default/josm was not specified as input (see shellcheck -x).


In linux/tested/usr/bin/josm line 40:
        if [ "z$ALTERNATIVE_JDK" = "z`readlink -n -f $jcmd`" ] && [ -z "${JAVACMD}" ]; then
                                     ^--------------------^ SC2006: Use $(...) notation instead of legacy backticked `...`.
                                                     ^---^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        if [ "z$ALTERNATIVE_JDK" = "z$(readlink -n -f "$jcmd")" ] && [ -z "${JAVACMD}" ]; then


In linux/tested/usr/bin/josm line 49:
        if [ -x "$jcmd" -a -z "${JAVACMD}" ]; then
                        ^-- SC2166: Prefer [ p ] && [ q ] as [ p -a q ] is not well defined.


In linux/tested/usr/bin/josm line 58:
    if [ "`expr match \"${JAVACMD}\" 'java-9'`" != "0" ] || [ "`expr match \"${JAVACMD}\" 'java-10'`" != "0" ]; then
          ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.
           ^--^ SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].
                                                               ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.
                                                                ^--^ SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].

Did you mean: 
    if [ "$(expr match \"${JAVACMD}\" 'java-9')" != "0" ] || [ "$(expr match \"${JAVACMD}\" 'java-10')" != "0" ]; then


In linux/tested/usr/bin/josm line 60:
    elif [ "`expr match \"${JAVACMD}\" 'java-1'`" != "0" ]; then
            ^-- SC2006: Use $(...) notation instead of legacy backticked `...`.
             ^--^ SC2003: expr is antiquated. Consider rewriting this using $((..)), ${} or [[ ]].

Did you mean: 
    elif [ "$(expr match \"${JAVACMD}\" 'java-1')" != "0" ]; then


In linux/tested/usr/bin/josm line 65:
        $JAVACMD $JAVA_OPTS -jar /usr/share/josm/josm.jar "$@"
                 ^--------^ SC2086: Double quote to prevent globbing and word splitting.

Did you mean: 
        $JAVACMD "$JAVA_OPTS" -jar /usr/share/josm/josm.jar "$@"

For more information:
  https://www.shellcheck.net/wiki/SC2166 -- Prefer [ p ] && [ q ] as [ p -a q...
  https://www.shellcheck.net/wiki/SC1091 -- Not following: /etc/default/josm ...
  https://www.shellcheck.net/wiki/SC2016 -- Expressions don't expand in singl...

[simon04]

In 15916/josm:

fix #18756 - Fix shellcheck warnings of shellscripts

[skyper]

Are the changes from #!/bin/sh to #!/bin/bash really needed ?

[simon04]

In POSIX sh, [[ ]] is undefined – ​https://www.shellcheck.net/wiki/SC2039

Is the Bash requirement a major concern?

[Don-vip]

@sebastic: is it a problem for Debian if our shell scripts explicitly target bash?

[anonymous]

As long as you #!/bin/bash for scripts with bashisms that's fine.

[sebastic]

The josm laucher script is broken in 15927:

Using /usr/lib/jvm/java-11-openjdk-amd64/bin/java to execute josm.
Unrecognized option: --add-modules java.scripting,java.sql -Djosm.restart=true -Djava.net.useSystemProxies=true 
Error: Could not create the Java Virtual Machine.
Error: A fatal exception has occurred. Program will exit.

[skyper]

It worked/works for me on Debian 10 (Buster).

[anonymous]

It was most definitely broken with josm (0.0.svn15927+dfsg-1) in Debian unstable.

Which package are you using on buster? The offending changes in 15927 are not in buster-backports yet.

[skyper]

I use latest from JOSM and tested from Debian buster-backports.
Had no problem, with version 1.5.svn15927.
Might be Debian related.

[simon04]

In 15944/josm:

fix #18756 - Launch scripts: fix $JAVA_OPTS (patch by sebastic)

Unrecognized option: --add-modules java.scripting,java.sql -Djosm.restart=true -Djava.net.useSystemProxies=true