本頁說明輸出目錄的相關規定和版面配置。
需求條件
輸出目錄版面配置的相關規定:
- 即使多位使用者在同一個方塊上建構,也不會發生衝突。
- 支援同時在多個工作區中建構。
- 支援在同一個工作區中為多個目標設定進行建構。
- 不會與其他工具衝突。
- 方便存取。
- 清潔容易,甚至可以選擇性清潔。
- 即使使用者在變更至用戶端目錄時依賴符號連結,也能確保不發生混淆。
- 每位使用者的所有建構狀態都應位於一個目錄下方 (「我想清除所有用戶端的所有 .o 檔案。」)
目前的版面配置
目前實作的解決方案:
- 您必須從包含存放區邊界檔案的目錄或其子目錄中叫用 Bazel。換句話說,您必須從存放區內部叫用 Bazel。否則,系統會回報錯誤。
- 在 Linux 上,outputRoot 目錄預設為
${XDG_CACHE_HOME}/bazel
(如果未設定XDG_CACHE_HOME
環境變數,則為~/.cache/bazel
);在 macOS 上,預設為/private/var/tmp
;在 Windows 上,如果已設定,則預設為%HOME%
;如果已設定,則為%USERPROFILE%
;否則為設定FOLDERID_Profile
標記後呼叫SHGetKnownFolderPath()
的結果。如果已設定環境變數$TEST_TMPDIR
(例如在 Bazel 本身的測試中),則該值會覆寫預設值。 - Bazel 使用者的建構狀態位於
outputRoot/_bazel_$USER
下方。這就是所謂的 outputUserRoot 目錄。 outputUserRoot
目錄下方有install
目錄,其中的installBase
目錄名稱為 Bazel 安裝資訊清單的 MD5 雜湊。- 在
outputUserRoot
目錄下方,也會建立outputBase
目錄,其名稱為工作區根目錄路徑名稱的 MD5 雜湊。舉例來說,如果 Bazel 是在工作區根目錄/home/user/src/my-project
(或連結至該目錄的符號連結目錄) 中執行,系統就會建立名為/home/user/.cache/bazel/_bazel_user/7ffd56a6e4cb724ea575aba15733d113
的輸出基礎目錄。您也可以在工作區根目錄中執行echo -n $(pwd) | md5sum
來取得 MD5。 - 您可以使用 Bazel 的
--output_base
啟動選項,覆寫預設的輸出基礎目錄。例如bazel --output_base=/tmp/bazel/output build x/y:z
。 - 您也可以使用 Bazel 的
--output_user_root
啟動選項,覆寫預設安裝基礎和輸出基礎目錄。例如:bazel --output_user_root=/tmp/bazel build x/y:z
。
「bazel-<workspace-name>」,「bazel-out」、「bazel-testlogs」和「bazel-bin」的符號連結會放在工作區目錄中;這些符號連結會指向輸出目錄中特定目標目錄中的某些目錄。這些符號連結僅供使用者方便使用,Bazel 本身不會使用這些連結。此外,只有在工作區根目錄可寫入時,才會執行這項操作。
版面配置圖
目錄的排列方式如下:
<workspace-name>/ <== The workspace root bazel-my-project => <...my-project> <== Symlink to execRoot bazel-out => <...bin> <== Convenience symlink to outputPath bazel-bin => <...bin> <== Convenience symlink to most recent written bin dir $(BINDIR) bazel-testlogs => <...testlogs> <== Convenience symlink to the test logs directory /home/user/.cache/bazel/ <== Root for all Bazel output on a machine: outputRoot _bazel_$USER/ <== Top level directory for a given user depends on the user name: outputUserRoot install/ fba9a2c87ee9589d72889caf082f1029/ <== Hash of the Bazel install manifest: installBase _embedded_binaries/ <== Contains binaries and scripts unpacked from the data section of the bazel executable on first run (such as helper scripts and the main Java file BazelServer_deploy.jar) 7ffd56a6e4cb724ea575aba15733d113/ <== Hash of the client's workspace root (such as /home/user/src/my-project): outputBase action_cache/ <== Action cache directory hierarchy This contains the persistent record of the file metadata (timestamps, and perhaps eventually also MD5 sums) used by the FilesystemValueChecker. action_outs/ <== Action output directory. This contains a file with the stdout/stderr for every action from the most recent bazel run that produced output. command.log <== A copy of the stdout/stderr output from the most recent bazel command. external/ <== The directory that remote repositories are downloaded/symlinked into. server/ <== The Bazel server puts all server-related files (such as socket file, logs, etc) here. jvm.out <== The debugging output for the server. execroot/ <== The working directory for all actions. For special cases such as sandboxing and remote execution, the actions run in a directory that mimics execroot. Implementation details, such as where the directories are created, are intentionally hidden from the action. Every action can access its inputs and outputs relative to the execroot directory. _main/ <== Working tree for the Bazel build & root of symlink forest: execRoot _bin/ <== Helper tools are linked from or copied to here. bazel-out/ <== All actual output of the build is under here: outputPath local_linux-fastbuild/ <== one subdirectory per unique target BuildConfiguration instance; this is currently encoded bin/ <== Bazel outputs binaries for target configuration here: $(BINDIR) foo/bar/_objs/baz/ <== Object files for a cc_* rule named //foo/bar:baz foo/bar/baz1.o <== Object files from source //foo/bar:baz1.cc other_package/other.o <== Object files from source //other_package:other.cc foo/bar/baz <== foo/bar/baz might be the artifact generated by a cc_binary named //foo/bar:baz foo/bar/baz.runfiles/ <== The runfiles symlink farm for the //foo/bar:baz executable. MANIFEST _main/ ... genfiles/ <== Bazel puts generated source for the target configuration here: $(GENDIR) foo/bar.h such as foo/bar.h might be a headerfile generated by //foo:bargen testlogs/ <== Bazel internal test runner puts test log files here foo/bartest.log such as foo/bar.log might be an output of the //foo:bartest test with foo/bartest.status foo/bartest.status containing exit status of the test (such as PASSED or FAILED (Exit 1), etc) include/ <== a tree with include symlinks, generated as needed. The bazel-include symlinks point to here. This is used for linkstamp stuff, etc. host/ <== BuildConfiguration for build host (user's workstation), for building prerequisite tools, that will be used in later stages of the build (ex: Protocol Compiler) <packages>/ <== Packages referenced in the build appear as if under a regular workspace
RunfilesSupport 指向的位置會更詳細說明 *.runfiles 目錄的版面配置。
bazel clean
bazel clean
會對 outputPath
和 action_cache
目錄執行 rm -rf
。並移除工作區的符號連結。--expunge
選項會清除整個 outputBase。