为什么Gradle在处理proto文件时忽略sourceSets和/或srcDir？

Question

我的目录结构是src/ps/proto。我的build.gradle文件位于src目录中。我已将源集设置为

sourceSets {
    ps {
        proto {
             srcDir 'ps/proto'
        }
    }
}

然而，gradlew generatePsProto给了我一系列错误，其中之一是我的源目录是src/src/ps/proto。

Execution failed for task ':generatePsProto'.
> protoc: stdout: . stderr: /home/build/tree/src/src/ps/proto: warning: directory does not exist.
  [libprotobuf WARNING google/protobuf/compiler/parser.cc:546] No syntax specified for the proto file: cldb.proto. Please use 'syntax = "proto2";' or 'syntax = "proto3";' to specify a syntax version. (Defaulted to proto2 syntax.)
  ps/proto/security.proto: File not found.
  ps/proto/common.proto: File not found.
  ps/proto/cli.proto: File not found.
  ps/proto/volumemirrorcommon.proto: File not found.
  ps/proto/metrics.proto: File not found.
  cldb.proto: Import "ps/proto/security.proto" was not found or had errors.
  cldb.proto: Import "ps/proto/common.proto" was not found or had errors.
  mldb.proto: Import "ps/proto/cli.proto" was not found or had errors.
  mldb.proto:214:12: "CredentialsMsg" is not defined.
  mldb.proto:218:12: "CredentialsMsg" is not defined.
  [...]
  mldb.proto:3614:12: "Key" is not defined.
  mldb.proto:3618:12: "CredentialsMsg" is not defined.
  mldb.proto:3619:12: "ServerKeyType" is not defined.

我不想要src/ps/proto的Gradle默认值。我想要PS/Proto。这能做到吗？我的目标是删除对protoc的硬编码exec调用，并使用protobuf插件将*.proto文件编译为各自的*.h、*.cc，最终编译为*.o文件。

Build.Gradle

buildscript {
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath 'com.google.protobuf:protobuf-gradle-plugin:0.8.5'
    }
}


apply plugin: 'c'
apply plugin: 'cpp'
apply plugin: 'java'
apply plugin: 'com.google.protobuf'

repositories {
    mavenCentral()
}

dependencies {
    compile "com.google.protobuf:protobuf-java:2.4.1"
}


sourceSets {
    ps {
        proto {
            srcDir 'ps/proto'
        }
    }
}

protobuf {
    protoc {
        artifact = 'com.google.protobuf:protoc:2.4.1'
    }

    generateProtoTasks {
        all().each { task ->
            task.plugins {
                cpp {}
            }
        }
    }
}

Answer 1

Gradle有一个广泛适用的约定，即可以用同名的方法配置集合属性。使用赋值(=)设置属性与使用方法设置属性之间的主要区别在于，后者会追加属性的值。

因此，要重写源集的默认源目录，需要使用赋值：

sourceSets {
    ps {
        proto {
            srcDirs = ['ps/proto']
        }
    }
}

我真的不明白为什么会收到关于src/src/ps/proto的错误消息，所以可能还有其他问题。该错误似乎来自protoc，而不是gradle。

import security.proto;