Android原始碼下載
• Android, AOSP, kernel, repo
Android原始碼包含兩個部分：Android開源專案（Android Open Source Project，AOSP）原始碼與Android內核原始碼。
下載前、首先確認以下事項：
- git
- curl
- python
- POSIX相容系統
前三項都是下載所需的組件，不必多說；說說最後一項：一開始打算在Windows下使用MinGW32進行下載的，但是遇到這樣的錯誤：
ImportError: No module named fcntl
於是、果斷投奔Mac OS X的懷抱。但也有人改換Cygwin，感興趣的可以一試。
鑑於龐大的程式碼規模、請務必使用高速且穩定的網路：Android開源專案原始碼藉由專用工具repo、可以實現斷點續傳；而Android內核原始碼、一旦中斷就得重新開始。
Android開源專案原始碼的下載教程請參考這裡，Android內核原始碼的下載教程請參考這裡。以下簡單的做下筆記：
Android開源專案原始碼下載
下載安裝repo：
nawix-osx:~ kenmux$ mkdir bin
nawix-osx:~ kenmux$ cd bin
nawix-osx:bin kenmux$ curl https://storage.googleapis.com/git-repo-downloads/repo > ~/bin/repo
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 26223 100 26223 0 0 17546 0 0:00:01 0:00:01 --:--:-- 17552
nawix-osx:bin kenmux$ chmod a+x ~/bin/repo
nawix-osx:bin kenmux$ 注：由於沒有將~/bin加入PATH，故以下採用完整路徑來呼叫repo。
初啟化repo客戶端：
nawix-osx:bin kenmux$ mkdir android
nawix-osx:bin kenmux$ cd android/
nawix-osx:android kenmux$ ~/bin/repo init -u https://android.googlesource.com/platform/manifest
warning: gpg (GnuPG) is not available.
warning: Installing it is strongly encouraged.
......
Your identity is: kenmux <[email protected]>
If you want to change this, please re-run 'repo init' with --config-name
Testing colorized output (for 'repo diff', 'repo status'):
black red green yellow blue magenta cyan white
bold dim ul reverse
Enable color display in this user account (y/N)? y
repo has been initialized in /Users/kenmux/bin/android
nawix-osx:android kenmux$ 下載Android原始碼樹：
nawix-osx:android kenmux$ ~/bin/repo sync
Fetching project device/google/atv
Fetching project device/htc/flounder
Fetching project platform/prebuilts/devtools
Fetching project platform/hardware/marvell/bt
......
Checking out files: 100% (507/507), done.ng out files: 27% (140/507)
Checking out files: 100% (15778/15778), done.ut files: 3% (627/15778)
Checking out files: 100% (19/19), done.
Syncing work tree: 100% (515/515), done.
nawix-osx:android kenmux$ 程式碼規模：
檢視內容：
nawix-osx:android kenmux$ ls -al
total 48
drwxr-xr-x 32 kenmux staff 1088 7 14 14:08 .
drwxr-xr-x 6 kenmux staff 204 7 13 18:52 ..
-rw-r--r--@ 1 kenmux staff 8196 7 14 14:08 .DS_Store
drwxr-xr-x 10 kenmux staff 340 7 14 13:39 .repo
lrwxr-xr-x 1 kenmux staff 19 7 14 13:39 Android.bp -> build/soong/root.bp
-r--r--r-- 1 kenmux staff 87 7 14 13:39 Makefile
drwxr-xr-x 26 kenmux staff 884 7 14 13:39 art
drwxr-xr-x 19 kenmux staff 646 7 14 13:39 bionic
drwxr-xr-x 3 kenmux staff 102 7 14 13:39 bootable
lrwxr-xr-x 1 kenmux staff 26 7 14 13:39 bootstrap.bash -> build/soong/bootstrap.bash
drwxr-xr-x 14 kenmux staff 476 7 14 13:39 build
drwxr-xr-x 18 kenmux staff 612 7 14 13:40 cts
drwxr-xr-x 14 kenmux staff 476 7 14 13:40 dalvik
drwxr-xr-x 5 kenmux staff 170 7 14 13:40 developers
drwxr-xr-x 22 kenmux staff 748 7 14 13:41 development
drwxr-xr-x 12 kenmux staff 408 7 14 13:41 device
drwxr-xr-x 3 kenmux staff 102 7 14 13:42 docs
drwxr-xr-x 245 kenmux staff 8330 7 14 13:48 external
drwxr-xr-x 17 kenmux staff 578 7 14 13:49 frameworks
drwxr-xr-x 13 kenmux staff 442 7 14 13:50 hardware
drwxr-xr-x 3 kenmux staff 102 7 14 13:50 kernel
drwxr-xr-x 31 kenmux staff 1054 7 14 13:50 libcore
drwxr-xr-x 15 kenmux staff 510 7 14 13:50 libnativehelper
drwxr-xr-x 23 kenmux staff 782 7 14 13:50 ndk
drwxr-xr-x 9 kenmux staff 306 7 14 13:52 packages
drwxr-xr-x 8 kenmux staff 272 7 14 13:52 pdk
drwxr-xr-x 7 kenmux staff 238 7 14 13:52 platform_testing
drwxr-xr-x 20 kenmux staff 680 7 14 13:58 prebuilts
drwxr-xr-x 31 kenmux staff 1054 7 14 13:59 sdk
drwxr-xr-x 22 kenmux staff 748 7 14 13:59 system
drwxr-xr-x 3 kenmux staff 102 7 14 13:59 toolchain
drwxr-xr-x 5 kenmux staff 170 7 14 14:00 tools
nawix-osx:android kenmux$ 建議在做研究之前、先做備份：
nawix-osx:android kenmux$ cd ..
nawix-osx:bin kenmux$ rsync -av android android.bak
building file list ... done
created directory android.bak
android/
android/.DS_Store
android/Android.bp -> build/soong/root.bp
android/Makefile
android/bootstrap.bash -> build/soong/bootstrap.bash
android/.repo/
......
android/tools/test/connectivity/acts/tests/google/wifi/WifiScannerMultiScanTest.py
android/tools/test/connectivity/acts/tests/google/wifi/WifiScannerScanTest.py
android/tools/test/connectivity/acts/tests/google/wifi/WifiScannerTests.config
android/tools/test/connectivity/acts/tests/sample/
android/tools/test/connectivity/acts/tests/sample/SampleTest.py
sent 35318215998 bytes received 13530514 bytes 8087844.00 bytes/sec
total size is 35274344962 speedup is 1.00
nawix-osx:bin kenmux$ 羅列下屬專案：
nawix-osx:bin kenmux$ cd android
nawix-osx:android kenmux$ ~/bin/repo forall -c 'echo "$REPO_PATH -- $REPO_PROJECT"'
art -- platform/art
bionic -- platform/bionic
bootable/recovery -- platform/bootable/recovery
build -- platform/build
build/blueprint -- platform/build/blueprint
build/kati -- platform/build/kati
build/soong -- platform/build/soong
cts -- platform/cts
......
toolchain/binutils -- toolchain/binutils
tools/apksig -- platform/tools/apksig
tools/external/fat32lib -- platform/tools/external/fat32lib
tools/external/gradle -- platform/tools/external/gradle
tools/test/connectivity -- platform/tools/test/connectivity
nawix-osx:android kenmux$ 檢視Git分支：
nawix-osx:android kenmux$ cd .repo/manifests/
nawix-osx:manifests kenmux$ ls -a
. .. .git default.xml
nawix-osx:manifests kenmux$ git branch -r
m/master -> origin/master
origin/adt_23.0.3
origin/android-1.6_r1
origin/android-1.6_r1.1
origin/android-1.6_r1.2
origin/android-1.6_r1.3
origin/android-1.6_r1.4
origin/android-1.6_r1.5
......
origin/webview-m40_r1
origin/webview-m40_r2
origin/webview-m40_r3
origin/webview-m40_r4
nawix-osx:manifests kenmux$ 這樣、依次執行以下指令、便可以切換特定版本的Android原始碼：
~/bin/repo init -u https://android.googlesource.com/platform/manifest -b [ANDROID_BRANCH]
~/bin/repo sync關於repo指令的使用說明，請參考Repo command reference，或者Efalk資料檔之Repo，這裡就不多加著墨了。
Android內核原始碼下載
Android內核原始碼下載則比較簡單，直接從遠端存儲庫複製即可：
git clone https://android.googlesource.com/kernel/common.git
git clone https://android.googlesource.com/kernel/goldfish.git
git clone https://android.googlesource.com/kernel/hikey-linaro
git clone https://android.googlesource.com/kernel/x86_64.git
git clone https://android.googlesource.com/kernel/exynos.git
git clone https://android.googlesource.com/kernel/msm.git
git clone https://android.googlesource.com/kernel/omap.git
git clone https://android.googlesource.com/kernel/samsung.git
git clone https://android.googlesource.com/kernel/tegra.git注：
- common專案、其原始碼通用
- goldfish專案、其原始碼用於模擬器
- 其他類別專案、其原始碼用於不同廠商/設備
這裡下載的是common專案下的原始碼：
cd nawix-osx:~ kenmux$ cd ~/bin
nawix-osx:bin kenmux$ mkdir kernel
nawix-osx:bin kenmux$ cd kernel
nawix-osx:kernel kenmux$ git clone https://android.googlesource.com/kernel/common.git
Cloning into 'common'...
remote: Sending approximately 1.01 GiB ...
remote: Total 4614730 (delta 3857285), reused 4614730 (delta 3857285)
Receiving objects: 100% (4614730/4614730), 1.01 GiB | 1.04 MiB/s, done.
Resolving deltas: 100% (3857285/3857285), done.
Checking connectivity... done.
nawix-osx:kernel kenmux$ 程式碼規模：
檢視Git分支：
nawix-osx:kernel kenmux$ cd common/
nawix-osx:common kenmux$ ls -a
. .. .git
nawix-osx:common kenmux$ git branch -av
* master fe8bf45 empty commit
remotes/origin/HEAD -> origin/master
remotes/origin/android-3.10 e11ce62 UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-3.10.y ed22006 update defconfig to enable ext4 encryption
remotes/origin/android-3.14 6186bde UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-3.18 0433cb1 UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-3.4 cb38f01 UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-4.1 7436668 UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-4.4 f8a27f3 UPSTREAM: ppp: take reference on channels netns
remotes/origin/android-trusty-3.10 78dd8a2 trusty-ipc: Add support for default Trusty IPC device
remotes/origin/android-trusty-3.18 182c86e trusty-virtio: Fix trusty_virtio_notify prototype
remotes/origin/android-trusty-4.4 096c9fe trusty-irq: Add support for secure interrupt mapping
remotes/origin/bcmdhd-3.10 4f750ce net: wireless: bcmdhd: Use different structs for scan reporting
remotes/origin/brillo-m10-dev 82c6fea ANDROID: dm-crypt: run in a WQ_HIGHPRI workqueue
remotes/origin/brillo-m10-release 22b269c BACKPORT: FROMLIST: mm: ASLR: use get_random_long()
remotes/origin/brillo-m7-dev 829d8c9 staging: ion: debugfs to shrink pool
remotes/origin/brillo-m7-mr-dev 829d8c9 staging: ion: debugfs to shrink pool
remotes/origin/brillo-m7-release 829d8c9 staging: ion: debugfs to shrink pool
remotes/origin/brillo-m8-dev bd355208 Merge branch 'android-3.18-zram' into android-3.18
remotes/origin/brillo-m8-release bd355208 Merge branch 'android-3.18-zram' into android-3.18
remotes/origin/brillo-m9-dev 7682bfa UPSTREAM: HID: hid-input: allow input_configured callback return errors
remotes/origin/brillo-m9-release 7682bfa UPSTREAM: HID: hid-input: allow input_configured callback return errors
remotes/origin/deprecated/android-2.6.39 b8d9d67 Merge remote-tracking branch 'common/linux-bcm43xx-2.6.39' into common-39
remotes/origin/deprecated/android-3.0 563897d pstore: selinux: add security in-core xattr support for rootfs, pstore and debugfs
remotes/origin/deprecated/android-3.10-adf ac4ddb0 video: adf: expose adf_modeinfo_set_{name,vrefresh} to drivers
remotes/origin/deprecated/android-3.3 6c3978c Fix 3.3 merge error in: drivers: power: Add watchdog timer to catch drivers which lockup during suspend.
remotes/origin/deprecated/android-3.4-compat a7827a2 Merge branch 'android-3.4' into android-3.4-compat
remotes/origin/deprecated/coupled-cpuidle abcca36 cpuidle: coupled: add parallel barrier function
remotes/origin/deprecated/experimental/android-3.10 3bfc1e9 sync: Fix a race condition between release_obj and print_obj
remotes/origin/deprecated/experimental/android-3.10-rc5 4dc805f kconfig: Fix defconfig when one choice menu selects options that another choice menu depends on
remotes/origin/deprecated/experimental/android-3.14 8e9fc46 xt_qtaguid: Fix boot panic
remotes/origin/deprecated/experimental/android-3.18 1ba6b2f proc: make oom adjustment files user read-only
remotes/origin/deprecated/experimental/android-3.8 e7f415e netfilter: xt_qtaguid: fix bad tcp_time_wait sock handling
remotes/origin/deprecated/experimental/android-3.9 c98631b pstore: Update Documentation/android.txt
remotes/origin/deprecated/experimental/android-3.9-rc2 33bc629 pstore: Update Documentation/android.txt
remotes/origin/deprecated/experimental/android-3.9-rc7 6bc79ce fuse: Fix build after change to synchronize with library
remotes/origin/deprecated/linux-bcm43xx-2.6.39 2277c65 net: wireless: bcmdhd: Report proper mcs rate mask
remotes/origin/experimental/android-4.1 01873ac trace: cpufreq: Add tracing for min/max cpufreq
remotes/origin/experimental/android-4.4 f782fce Revert "HACK: input: evdev: disable EVIOCREVOKE"
remotes/origin/experimental/android-4.4-llvm 5e501df clang makefile
remotes/origin/master fe8bf45 empty commit
nawix-osx:common kenmux$