[SPARK-15542][SPARKR] Make error message clear for script './R/install-dev.sh' when R is missing on Mac
https://issues.apache.org/jira/browse/SPARK-15542 ## What changes were proposed in this pull request? When running`./R/install-dev.sh` in **Mac OS EI Captain** environment, I got ``` mbp185-xr:spark xin$ ./R/install-dev.sh usage: dirname path ``` This message is very confusing to me, and then I found R is not properly configured on my Mac when this script is using `$(which R)` to get R home. I tried similar situation on CentOS with R missing, and it's giving me very clear error message while MacOS is not. on CentOS: ``` [rootip-xxx-31-9-xx spark]# which R /usr/bin/which: no R in (/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/usr/lib/jvm/java-1.7.0-openjdk.x86_64/bin:/root/bin) ``` but on Mac, if not found then nothing returned and this is causing the confusing message for R build failure and running R/install-dev.sh: ``` mbp185-xr:spark xin$ which R mbp185-xr:spark xin$ ``` Here I just added a clear message for this miss configuration for R when running `R/install-dev.sh`. ``` mbp185-xr:spark xin$ ./R/install-dev.sh Cannot find R home by running 'which R', please make sure R is properly installed. ``` ## How was this patch tested? Manually tested on local machine. Author: Xin Ren <iamshrek@126.com> Closes #13308 from keypointt/SPARK-15542.
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@ -38,7 +38,12 @@ pushd $FWDIR > /dev/null
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if [ ! -z "$R_HOME" ]
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then
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R_SCRIPT_PATH="$R_HOME/bin"
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else
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else
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# if system wide R_HOME is not found, then exit
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if [ ! `command -v R` ]; then
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echo "Cannot find 'R_HOME'. Please specify 'R_HOME' or make sure R is properly installed."
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exit 1
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fi
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R_SCRIPT_PATH="$(dirname $(which R))"
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fi
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echo "USING R_HOME = $R_HOME"
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