├── .gitignore ├── BUILD ├── InjectionManager.java ├── LICENSE ├── MANIFEST.MF ├── Makefile ├── README.md ├── WORKSPACE ├── tests ├── BUILD └── rules.bzl └── tools ├── bazel └── jar_injector.sh /.gitignore: -------------------------------------------------------------------------------- 1 | bazel-* 2 | .idea 3 | *.jar 4 | user.bazelrc 5 | external 6 | build.j -------------------------------------------------------------------------------- /BUILD: -------------------------------------------------------------------------------- https://raw.githubusercontent.com/bazel-ios/BazelInject/32f2cf32c3835d1edd8ecdc7706c97f2d15b95da/BUILD -------------------------------------------------------------------------------- /InjectionManager.java: -------------------------------------------------------------------------------- 1 | import java.lang.reflect.Method; 2 | import java.net.URL; 3 | import java.net.URLClassLoader; 4 | import java.lang.ClassLoader; 5 | import java.util.Arrays; 6 | import java.io.BufferedReader; 7 | import java.io.InputStreamReader; 8 | import java.io.File; 9 | import java.util.Map; 10 | import java.io.InputStream; 11 | import java.io.FileOutputStream; 12 | import java.io.FileInputStream; 13 | 14 | // Injects user jars into Bazel, then starts the server 15 | public class InjectionManager { 16 | private Thread nativeRuleJVMThread; 17 | 18 | public InjectionManager() {} 19 | 20 | private URLClassLoader loadJar(String path) throws Exception { 21 | URL serverJarURL = new URL(path); 22 | URLClassLoader loader = new URLClassLoader( 23 | new URL[] {serverJarURL}, 24 | this.getClass().getClassLoader() 25 | ); 26 | return loader; 27 | } 28 | 29 | // Injects injectJar into baseJar 30 | int injectJar(String injectorPath, String baseJar, String injectJar) throws Exception { 31 | String[] command = {"/bin/bash", "-c", "source " + injectorPath}; 32 | ProcessBuilder pb = new ProcessBuilder(command); 33 | // Consider refactoring this a bit 34 | Map env = pb.environment(); 35 | env.put("BAZEL_JAR", baseJar); 36 | if (injectJar != null) { 37 | env.put("INJECT_JAR", injectJar); 38 | } 39 | 40 | Process cmdProc = pb.start(); 41 | BufferedReader stdoutReader = new BufferedReader( 42 | new InputStreamReader(cmdProc.getInputStream())); 43 | String line; 44 | while ((line = stdoutReader.readLine()) != null) { 45 | System.out.println(line); 46 | } 47 | 48 | BufferedReader stderrReader = new BufferedReader( 49 | new InputStreamReader(cmdProc.getErrorStream())); 50 | while ((line = stderrReader.readLine()) != null) { 51 | System.err.println(line); 52 | } 53 | cmdProc.waitFor(); 54 | return cmdProc.exitValue(); 55 | } 56 | 57 | // Load the injector script from this archive 58 | String unpackInjector() throws Exception { 59 | File folder = new File("bazel-inject/"); 60 | if (!folder.exists()) { 61 | folder.mkdirs(); 62 | } 63 | String injector = "jar_injector.sh"; 64 | File injectorF = new File(folder, injector); 65 | FileOutputStream output = new FileOutputStream(injectorF); 66 | int bytesRead = 0; 67 | byte[] buffer = new byte[4096]; 68 | InputStream input = InjectionManager.class.getResourceAsStream(injector); 69 | while ((bytesRead = input.read(buffer)) != -1) { 70 | output.write(buffer, 0, bytesRead); 71 | } 72 | return injectorF.getPath(); 73 | } 74 | 75 | void callMain(String workspaceRoot, String[] serverArgs, String baseJar, String injectJar) throws Exception { 76 | String injector = unpackInjector(); 77 | int injectStatus = injectJar(injector, baseJar, injectJar); 78 | if (injectStatus != 0) { 79 | throw new java.lang.Error("Failed to inject" + baseJar); 80 | } 81 | 82 | // Load the injected server 83 | String server = "file://" + workspaceRoot + "/bazel-inject/A-Server.jar"; 84 | URLClassLoader loader = loadJar(server); 85 | 86 | // src/main/java/com/google/devtools/build/lib/bazel/Bazel.java 87 | Class classToLoad = Class.forName("com.google.devtools.build.lib.bazel.Bazel", true, loader); 88 | Method method = classToLoad.getMethod("main", java.lang.String[].class); 89 | System.err.println("[INFO] loaded injector class.."); 90 | method.invoke(null, new Object[]{serverArgs}); 91 | } 92 | 93 | // The gist of this method is that we'll call Bazel's main - giving us the 94 | // ability to govern what modules are loaded: replacing/adding our own 95 | public void startBazel(String[] args) throws Exception { 96 | System.err.println("[Info] Bazelwrapper starting"); 97 | 98 | if (args.length < 3) { 99 | throw new java.lang.Error("Invalid args" + Arrays.toString(args)); 100 | } 101 | 102 | // Get/drop JVM args: e.g. [-jar, /var/tmp/_bazel_$x/install/$yx/A-server.jar,..] 103 | // These 2 lines have assuptions on Bazel CLI / invocation process 104 | String bazelJar = args[1]; 105 | String[] serverArgs = Arrays.copyOfRange(args, 2, args.length); 106 | 107 | // TODO: Update to proposed API: 108 | // A new --blaze_module starup option - to define a jar 109 | // --blaze_module=com.my.bazel.module=/path/to/module.jar 110 | String injectJar = null; 111 | for (int i = 0; i < serverArgs.length; i++) { 112 | String arg = serverArgs[i]; 113 | if (arg.startsWith("--host_jvm_args=-Dbazel.inject=") && arg.endsWith(".jar")) { 114 | injectJar = arg.substring(arg.lastIndexOf("=") + 1, arg.length()); 115 | break; 116 | } 117 | } 118 | // Assume they launch from the workspace dir 119 | String workspaceDir = System.getProperty("user.dir"); 120 | callMain(workspaceDir, serverArgs, bazelJar, injectJar); 121 | } 122 | 123 | public static void main(java.lang.String[] args) { 124 | InjectionManager im = new InjectionManager(); 125 | try { 126 | im.startBazel(args); 127 | } catch(Exception e) { 128 | System.err.println("[ERROR] Failed"); 129 | System.err.println(e); 130 | System.exit(1); 131 | } 132 | } 133 | } 134 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright [yyyy] [name of copyright owner] 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /MANIFEST.MF: -------------------------------------------------------------------------------- 1 | Main-Class: InjectionManager 2 | 3 | -------------------------------------------------------------------------------- /Makefile: -------------------------------------------------------------------------------- 1 | all: jar 2 | 3 | clean: 4 | rm -rf bazel-inject 5 | 6 | jar: clean 7 | # Consider moving this to Bazel 8 | mkdir -p bazel-inject/META-INF 9 | cp -f MANIFEST.MF bazel-inject/META-INF/MANIFEST.MF 10 | cp -f tools/jar_injector.sh bazel-inject 11 | javac -d bazel-inject InjectionManager.java 12 | cd bazel-inject && jar cmfv \ 13 | META-INF/MANIFEST.MF BazelInject.jar \ 14 | *.class *.sh 15 | 16 | ## Development helpers 17 | 18 | run: 19 | echo "Running with jar $$(shasum libmain.jar)" 20 | bazel shutdown 21 | bazel build tests/... 22 | 23 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | ## BazelInject 2 | 3 | BazelInject is an experiment to add advanced capabilities to the Bazel ecosystem 4 | via external APIs. Today you can extend Bazel with Starlark, but said 5 | capabilities aren't possible to achieve via Starlark. Upstreaming the rules to 6 | Bazel would make it too flexible _per proposal rejections_, so enable it via 7 | _external_ APIs. This is the alternative to doing it in ad-hoc forks of Bazel 8 | and promotes reuse. 9 | 10 | ### Usage 11 | 12 | _Bazel inject provides low level Jar injection atm_ 13 | ``` 14 | # Build from source to bazel-inject/BazelInject.jar 15 | git clone https://github.com/bazel-ios/bazelinject.git 16 | make 17 | ``` 18 | 19 | ``` 20 | # First, build your rules into a Jar file: 21 | # e.g: cd /path/to/bazel 22 | # bazel build src/main/java/com/google/devtools/build/lib/bazel:main 23 | 24 | # Then, BazelInject injects /path/to/my.jar into Bazel 25 | --host_jvm_args -Dbazel.inject=/path/to/bazel/bazel-bin/src/main/java/com/google/devtools/build/lib/bazel/libmain.jar 26 | --host_jvm_args -jar 27 | --host_jvm_args /path/to/bazelinject/bazel-inject/BazelInject.jar 28 | ``` 29 | 30 | _Note: if you're developing BazelInject - use a sha in the path - see `tools/bazel` for usage_ 31 | 32 | ## Proposed APIs and longer term goals 33 | 34 | ### External "native" API's for Starlark 35 | 36 | Today you can add a macro or rule in starlark, these APIs enable your starlark 37 | rules to interface with Bazel internals how you see fit. _think [post analysis 38 | actions](https://docs.google.com/document/d/16iogGwUlISoN2WLha2TAaUdpYCjRiVQ2sRQ7--INxkg/edit#heading=h.9bo6b686lx37) 39 | and other concepts you want but won't go into Bazel._ 40 | 41 | This is a new set of APIs with similar ideas as the Starlark API, but enables an 42 | interface to primitives _like_ `Action`, `RuleDefinition`, and `Artifact` to 43 | unlock advanced capabilities. The gist is you might include jvm features in 44 | existing Starklark rules e.g. alongside `starlark_library`. For instance, your 45 | own "build" APIs like `cc_common` or your own rules like `objc_library` based on 46 | `RuleDefinition`. 47 | 48 | _Note: while this may use similar concepts or directly use primitives like `RuleDefinition`, or `Spawn`, - it 49 | doesn't mean we'd make it intra-process or operate in the same way._ 50 | 51 | ### BlazeModule subset hooks 52 | 53 | A new startup Bazel option `-Dbazel.module=` that loads a `BlazeModule` or 54 | similar at the specified path: e.g. 55 | ``` 56 | -Dbazel.module=com.my.bazel.module:/path/to/module.jar 57 | ``` 58 | _`BlazeModule` is low level way to add custom spawn strategies, rules, and more. 59 | This API could start with a subset of BlazeModule_ 60 | 61 | ## Why do you want to give developers advanced capabilities? 62 | 63 | Flexibility - there are key features community build system engineers would like 64 | to add. The capabilites we'll enable here aren't suited for Bazel's core 65 | codebase, release workflow, or PR review process. 66 | 67 | Maintainability - interfacing with native Bazel providers, rules, and spawns is 68 | piviotal to using it at first, but for more advanced ecosystems implicates 69 | maintainer thrash and has severe limitations. 70 | 71 | ## Why not just cut Bazel releases for rules_ios, Foo, or Bar's usage? 72 | 73 | Reuse - developing a set of advanced capabilities we can depend on in 74 | `rules_ios` - and can be integrated by RBE vendors - or others already creating 75 | their own builds. This might mean restricting to the Java rules API. 76 | 77 | Finally, some of the rules will hinge on assumptions about actions end to end 78 | e.g. action refinement based on how we build an iOS app with `rules_ios`. _I'd 79 | also want to provide optional features that call native functionaity directly in 80 | `rules_ios` e.g. flipping on optimizations backed by JVM bytecode and these 81 | APIs`_ 82 | 83 | ## Use cases 84 | 85 | [Powerful APIs](https://github.com/bazel-ios/BazelInject#external-java-rules-api-for-starlark) and/or adding rules via `BlazeModule`, jar injection, enable a number of features like: 86 | 87 | - [Post analysis actions](https://docs.google.com/document/d/16iogGwUlISoN2WLha2TAaUdpYCjRiVQ2sRQ7--INxkg/edit#heading=h.9bo6b686lx37) 88 | - Comprehensive integration of [rules_ios Virtual frameworks](https://github.com/bazel-ios/rules_ios/pull/277) 89 | - Variants of C++ header scanning 90 | -------------------------------------------------------------------------------- /WORKSPACE: -------------------------------------------------------------------------------- 1 | load("//tests:rules.bzl", "x_repo") 2 | 3 | # Loading some test rules 4 | x_repo( 5 | name = "x", 6 | path = "z", 7 | ) 8 | -------------------------------------------------------------------------------- /tests/BUILD: -------------------------------------------------------------------------------- 1 | load("//tests:rules.bzl", "x_rule") 2 | x_rule(name="x", path="z") 3 | 4 | genrule( 5 | name = "foo", 6 | srcs = [], 7 | outs = ["foo.h"], 8 | cmd = "echo xx > $(OUTS)", 9 | ) 10 | -------------------------------------------------------------------------------- /tests/rules.bzl: -------------------------------------------------------------------------------- 1 | def _repo_impl(ctx): 2 | print("PATH", ctx.attr.path) 3 | ctx.execute(["mkdir", "-p", "external/" + ctx.name]) 4 | ctx.execute(["touch", "BUILD"]) 5 | 6 | x_repo = repository_rule( 7 | implementation = _repo_impl, 8 | local = True, 9 | # fragments = [], 10 | attrs = { 11 | "path": attr.label( 12 | mandatory = True, 13 | ), 14 | }, 15 | ) 16 | 17 | def _rule_impl(ctx): 18 | print("PATH", ctx.attr.path) 19 | # Here we call our custom swift_common 20 | # print("PKG", swift_common.compile(copts=["Some", "Other"])) 21 | 22 | x_rule = rule( 23 | implementation = _rule_impl, 24 | attrs = { 25 | "path": attr.string( 26 | mandatory = True, 27 | ), 28 | }, 29 | ) 30 | -------------------------------------------------------------------------------- /tools/bazel: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | 3 | set -euo pipefail 4 | 5 | readonly REPO_DIR="$( cd "$( dirname "$(dirname "${BASH_SOURCE[0]}" )" )" >/dev/null 2>&1 && pwd )" 6 | 7 | bazel_options=() 8 | passthrough_env=( 9 | "CC=clang" 10 | "PATH=/usr/bin:/bin" 11 | "USER=${USER:-build}" 12 | ) 13 | 14 | if [[ -n "${HOME:-}" ]]; then 15 | passthrough_env+=("HOME=$HOME") 16 | fi 17 | if [[ -n "${TERM:-}" ]]; then 18 | passthrough_env+=("TERM=$TERM") 19 | fi 20 | if [[ -n "${COLUMNS:-}" ]]; then 21 | passthrough_env+=("COLUMNS=$COLUMNS") 22 | fi 23 | 24 | # This is a development helper 25 | setup_injector() { 26 | local injector_main="InjectionManager.java" 27 | 28 | # shasum to noop compilation and reboot when it changes 29 | local jarf="injector.$(/usr/bin/shasum $injector_main | cut -d ' ' -f1).jar" 30 | local srcroot=$REPO_DIR 31 | if [[ ! -f "$srcroot/bazel-inject/$jarf" ]]; then 32 | echo "Bundling jar $injector_main.." 33 | rm -rf $srcroot/bazel-inject 34 | mkdir -p "$srcroot/bazel-inject/META-INF" 35 | cp -f MANIFEST.MF "$srcroot/bazel-inject/META-INF/MANIFEST.MF" 36 | cp -f $srcroot/tools/jar_injector.sh "$srcroot/bazel-inject" 37 | javac -d "$srcroot/bazel-inject" "$injector_main" 38 | (cd "$srcroot/bazel-inject" && jar cmfv \ 39 | META-INF/MANIFEST.MF "$jarf" \ 40 | *.class *.sh) 41 | fi 42 | 43 | # For development - put a file libmain.jar inside of the repo - we'll inject 44 | bazel_options+=(--host_jvm_args '-Dcom.google.devtools.build.lib.util.LogHandlerQuerier.class=null') 45 | bazel_options+=(--host_jvm_args -Dbazel.inject=$REPO_DIR/libmain.jar) 46 | 47 | # This seems to have to go last for now. 48 | bazel_options+=(--host_jvm_args -jar) 49 | bazel_options+=(--host_jvm_args $srcroot/bazel-inject/$jarf) 50 | } 51 | 52 | setup_injector 53 | 54 | if [[ -n "${BAZELISK_SKIP_WRAPPER:-}" ]]; then 55 | passthrough_env+=("BAZELISK_SKIP_WRAPPER=$BAZELISK_SKIP_WRAPPER") 56 | fi 57 | 58 | env -i \ 59 | "${passthrough_env[@]}" \ 60 | "$BAZEL_REAL" \ 61 | ${bazel_options[@]-} \ 62 | "$@" 63 | -------------------------------------------------------------------------------- /tools/jar_injector.sh: -------------------------------------------------------------------------------- 1 | #!/bin/bash 2 | # A helper file to dynamically load BlazeModules at startup 3 | set -e 4 | 5 | readonly REPO_DIR="$( cd "$( dirname "$(dirname "${BASH_SOURCE[0]}" )" )" >/dev/null 2>&1 && pwd )" 6 | 7 | jar_injector() { 8 | local srcroot="$1" 9 | 10 | local user_jar="$INJECT_JAR" 11 | [[ -f "$user_jar" ]] || (echo "error: missing jar $1" && exit 1) 12 | 13 | local injected_jar_n="injector.server.$(/usr/bin/shasum $user_jar | cut -d ' ' -f1).jar" 14 | 15 | # injecting A-Server.jar inside of this dir 16 | local wd="$srcroot/bazel-inject/" 17 | mkdir -p "$wd" 18 | local injected_jar="$srcroot/bazel-inject/$injected_jar_n" 19 | 20 | if [[ ! -f "$injected_jar" ]]; then 21 | local bazel_jar="$BAZEL_JAR" 22 | [[ -f "$bazel_jar" ]] || \ 23 | (echo "missing install $bazel_jar" && exit 1) 24 | cp "$bazel_jar" "$injected_jar" 25 | 26 | (cd "$wd" && rm -rf injectsrc) 27 | (cd "$wd" && mkdir injectsrc && cd injectsrc && unzip $user_jar) 28 | (cd "$wd" && find injectsrc) # Diagnostics 29 | (cd "$wd" && jar -uf $injected_jar -C injectsrc/ .) 30 | (cd "$wd" && cp $injected_jar A-Server.jar) 31 | fi 32 | echo "injected $injected_jar" 33 | } 34 | 35 | jar_injector "$REPO_DIR" 36 | --------------------------------------------------------------------------------