build-git.gradle

ext.getGitHash = { ->
    try {
        def stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'rev-parse', '--short', 'HEAD'
            standardOutput = stdout
        }
        return stdout.toString().trim()
    } catch (Exception e) {
        return ""
    }
}

ext.getGitLongHash = { ->
    try {
        def stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'rev-parse', 'HEAD'
            standardOutput = stdout
        }
        return stdout.toString().trim()
    } catch (Exception e) {
        return ""
    }
}

ext.getGitBranch = { ->
    try {
        def stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'rev-parse', '--abbrev-ref', 'HEAD'
            standardOutput = stdout
        }
        return stdout.toString().trim()
    } catch (Exception e) {
        return ""
    }
}

ext.getGitRemoteUrl = { ->
    try {
        def stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'name-rev', '--name-only', 'HEAD'
            standardOutput = stdout
        }
        def branch = stdout.toString().trim()

        stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'config', 'branch.' + branch + '.remote'
            standardOutput = stdout
        }
        def remote = stdout.toString().trim()

        stdout = new ByteArrayOutputStream()
        exec {
            commandLine 'git', 'config', 'remote.' + remote + '.url'
            standardOutput = stdout
        }
        return stdout.toString().trim()
    } catch (Exception e) {
        return ""
    }
}

ext.writeBuildFiles = { prefix='build' ->
    logger.info("Writing build.date file")
    new File(projectDir, prefix+".date").text = new Date().toString()+"\n"+System.currentTimeMillis()+"\n"
    String hash = getGitLongHash()
    if (hash?.trim()) {
        logger.info("Writing build.githash file: "+hash)
        new File(projectDir, prefix+".githash").text = hash+"\n"
    }
    String branch = getGitBranch()
    if (branch?.trim()) {
        logger.info("Writing build.gitbranch file: "+branch)
        new File(projectDir, prefix+".gitbranch").text = branch+"\n"
    }
    String remoteUrl = getGitRemoteUrl()
    if (remoteUrl?.trim()) {
        logger.info("Writing build.gitremoteurl file: "+remoteUrl)
        new File(projectDir, prefix+".gitremoteurl").text = remoteUrl+"\n"
    }
}