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Added option to disable xip #13326

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Added option to disable xip #13326

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9 changes: 7 additions & 2 deletions packager/react-native-xcode.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -80,9 +80,14 @@ if [[ "$CONFIGURATION" = "Debug" && ! "$PLATFORM_NAME" == *simulator ]]; then
if [ -z "$IP" ]; then
IP=$(ifconfig | grep 'inet ' | grep -v 127.0.0.1 | cut -d\ -f2 | awk 'NR==1{print $1}')
fi

if [ -z ${DISABLE_XIP+x} ]; then
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Hey, I'm working on this file and don't know what "+x" in ${DISABLE_XIP+x} does. (AFAICS, it is also not mentioned in the Bash manual.) Could you please explain?

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It's parameter expansion:

${parameter:+word}
If parameter is null or unset, nothing is substituted, otherwise the expansion of word is substituted.

So if DISABLE_XIP is null or unset then the check will fail otherwise it will pass. x is used here just as a placeholder.

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@AlicanC AlicanC Oct 25, 2017 •
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Turns out I've missed the part where it explains that the colon can be omitted:

Omitting the colon results in a test only for a parameter that is unset. Put another way, if the colon is included, the operator tests for both parameter’s existence and that its value is not null; if the colon is omitted, the operator tests only for existence.

Thanks!

I think I will change this to [[ $DISABLE_XIP != true ]] like I did with all the other boolean-y variables.

To be honest, ${DISABLE_XIP+x} looks ugly. I have completely rewritten this script and this is the last part of the whole thing that I could not understand. I don't like saying "If that was hard for me, then it will be for other people." but I guess this one deserves an exception.

Also, correct me if I'm wrong, but if a variable is set and I want to run a single command with that variable being unset, I have to use unset DISABLE_XIP; command which unsets the variable for the whole env and not just the command. A subshell can be used to avoid that but it just gets uglier. With a != true check, you can just do DISABLE_XIP= command; to turn it off and DISABLE_XIP=true command; to turn it on. This doesn't really matter in this use case, but I guess I will adopt this as one of my "Bash Best Practices".

What do you think?

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Yep that sounds completely reasonable and a nicer solution all round. Thanks!

IP="$IP.xip.io"
fi

$PLISTBUDDY -c "Add NSAppTransportSecurity:NSExceptionDomains:localhost:NSTemporaryExceptionAllowsInsecureHTTPLoads bool true" "$PLIST"
$PLISTBUDDY -c "Add NSAppTransportSecurity:NSExceptionDomains:$IP.xip.io:NSTemporaryExceptionAllowsInsecureHTTPLoads bool true" "$PLIST"
echo "$IP.xip.io" > "$DEST/ip.txt"
$PLISTBUDDY -c "Add NSAppTransportSecurity:NSExceptionDomains:$IP:NSTemporaryExceptionAllowsInsecureHTTPLoads bool true" "$PLIST"
echo "$IP" > "$DEST/ip.txt"
fi

BUNDLE_FILE="$DEST/main.jsbundle"
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