android6/7 system打包指令碼
1.android5打包system就是網站上常見的製作ROM必備的解包打包system指令碼
指令如下：mkuserimg.sh -s out/target/product/$TARGET_PRODUCT/system out/target/product/$TARGET_PRODUCT/obj/PACKAGING/systemimage_intermediates/system.img ext4 system 3195826176 -D out/target/product/$TARGET_PRODUCT/system -L system out/target/product/$TARGET_PRODUCT/root/file_contexts
android 5之前未啟用selinux，所以打包指令碼會少-L 引數，大致和android 5相同
2.到android 6之後，android開啟了system verify 簽名，未經簽名的image刷入不能開機，原因是system 掛載失敗。
解決辦法是修改分割槽掛載檔案，去掉system的verify引數，高通平臺為fstab.qcom
/dev/block/bootdevice/by-name/system /system ext4 ro,barrier=1,discard wait,verify
或者按照android要求對system進行簽名
檢視log得到了打包指令碼指令：python build/tools/releasetools/build_image.py out/target/product/$TARGET_PRODUCT/system out/target/product/$TARGET_PRODUCT/obj/PACKAGING/systemimage_intermediates/system_image_info.txt out/target/product/$TARGET_PRODUCT/system.img out/target/product/$TARGET_PRODUCT/system
LOG如下：
build_verity_tree -A aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7
out/target/product/msm8953_64/system.img /tmp/tmpKyrn_A_verity_images/verity.img
system/extras/verity/build_verity_metadata.py 3195826176 /tmp/tmpKyrn_A_verity_images/verity_metadata.img
1a78a3588e5656dd06555d0e4324c930368ead38567b62bde728f930582e57a8
aee087a5be3b982978c923f566a94613496b417f2af592639bc80d141e34dfe7 /dev/block/bootdevice/by-name/system out/host/linux-
x86/bin/verity_signer build/target/product/security/verity.pk8
append2simg out/target/product/msm8953_64/system.img /tmp/tmpKyrn_A_verity_images/verity_metadata.img
append2simg out/target/product/msm8953_64/system.img /tmp/tmpKyrn_A_verity_images/verity.img
out/target/product/msm8953_64/system.img maxsize=3288637440 blocksize=135168 total=2734485724 reserve=33251328
根據log提取依賴的指令碼和工具即可製作出打包簽名版system.img
當然如果你有原始碼不用這麼麻煩，直接make snod
但是有時候這還是很有用的。