I'm absolutely new to Groovy and Jenskins, please ignore if question sounds noob. Following is a code snippet from a jenkins file containing groovy code.

def boolean hasChanged(String searchText) {
    return sh(
        returnStatus: true,
        script: "git diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT} | grep \"${searchText}\""
    ) == 0
}

Questions:

1. Is the above snippet is function/method written in groovy?
2. what does return sh do?
3. Per my understanding script: "git diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT} | grep \"${searchText}\"" the output of grep \"${searchText}\"" is fed into it diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT}, is the understanding correct?

Please assist.

CodePudding user response：

It is looks like a Groovy with Jenkins plugins (sh)
Here I Added comments to explain this code.

// hasChanged method return boolean value
def boolean hasChanged(String searchText) {
// Insted of 
// def shResult = sh(...); return shResult
// the sh results is returned 
return sh(
        // Preform the sh script and return the script exist code
        returnStatus: true,
        script: "git diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT} | grep \"${searchText}\""
    ) == 0 // check script exist code status
}

The output of git diff is piped to grep command that searches for given text in the git diff output

CodePudding user response：

1. Yes
2. In this case, the entire Groovy function returns True if grep finds ${searchText} in the output of command git diff --name-only ${GIT_PREVIOUS_COMMIT} ${GIT_COMMIT}, or else False.