重击双引号内的单引号

Question

I want to execute the command:

xcodebuild -exportArchive -exportFormat IPA -archivePath myApp.xcarchive -exportPath myApp.ipa -exportProvisioningProfile 'myApp adhoc'

The above command works fine when simply executing in terminal. However, I am attempting to execute the command inside a wrapper function in bash. The wrapper function works by being passed a command and then executing that command basically. For example, a call to the wrapperFunction:

wrapperFunction "xcodebuild -exportArchive -exportFormat IPA -archivePath myApp.xcarchive -exportPath myApp.ipa -exportProvisioningProfile 'myApp adhoc'"

and the wrapperFunction itself:

wrapperFunction() {
    COMMAND="$1"
    $COMMAND
}

The problem is the single quotes in 'myApp adhoc' , because when running the command through wrapperFunction I get the error: error: no provisioning profile matches ''myApp' . It is not picking up the full name of the provisioning profile 'myApp adhoc'

EDIT: so say I also wanted to pass another string to wrapperFunction that was not part of the command to be executed. For example I wanted to pass a string to display if the command fails. Inside wrapperFunction I could check $? after the command and then display the failure string if $? -ne 0. How can I also pass a string with the command?

Answer 1

Don't mix code and data. Pass the arguments separately (this is what sudo and find -exec does):

wrapperFunction() {
    COMMAND=( "$@" )   # This follows your example, but could
    "${COMMAND[@]}"   # also be written as simply "$@" 
}

wrapperFunction xcodebuild -exportArchive -exportFormat IPA -archivePath myApp.xcarchive -exportPath myApp.ipa -exportProvisioningProfile 'myApp adhoc'

To provide a custom error message:

wrapperFunction() { 
    error="$1" # get the first argument
    shift      # then remove it and move the others down
    if ! "$@"  # if command fails
    then 
      printf "%s: " "$error"  # write error message
      printf "%q " "$@"       # write command, copy-pastable
      printf "\n"             # line feed
    fi
}
wrapperFunction "Failed to frub the foo" frubber --foo="bar baz"

This produces the message Failed to frub the foo: frubber --foo=bar\\ baz .

Since the method of quoting isn't important and isn't passed to commands or functions, the output may be quoted differently like here. They will still be functionally identical.