1 function hmm() { 2 # 打印帮助信息 3 cat <<EOF 4 Invoke ". build/envsetup.sh" from your shell to add the following functions to your environment: 5 - lunch: lunch <product_name>-<build_variant> 6 - tapas: tapas [<App1> <App2> ...] [arm|x86|mips|armv5|arm64|x86_64|mips64] [eng|userdebug|user] 7 - croot: Changes directory to the top of the tree. 8 - m: Makes from the top of the tree. 9 - mm: Builds all of the modules in the current directory, but not their dependencies. 10 - mmm: Builds all of the modules in the supplied directories, but not their dependencies. 11 To limit the modules being built use the syntax: mmm dir/:target1,target2. 12 - mma: Builds all of the modules in the current directory, and their dependencies. 13 - mmma: Builds all of the modules in the supplied directories, and their dependencies. 14 - cgrep: Greps on all local C/C++ files. 15 - ggrep: Greps on all local Gradle files. 16 - jgrep: Greps on all local Java files. 17 - resgrep: Greps on all local res/*.xml files. 18 - sgrep: Greps on all local source files. 19 - godir: Go to the directory containing a file. 20 21 Look at the source to view more functions. The complete list is: 22 EOF 23 # gettop是脚本内函数，功能:返回当前android代码树的顶层路径。前提是当前路径位于android代码树中 24 T=$(gettop) 25 # A变量 局部变量化 26 local A 27 A="" 28 # 查看envsetup.sh内容，且行首开始空格、制表符任意次，替换function为匹配的子串（函数名），按字符排升序、去掉重复 29 for i in `cat $T/build/envsetup.sh | sed -n "/^[ ]*function /s/function ([a-z_]*).*/1/p" | sort | uniq`; do 30 # 替换出来的函数名 追加在A后 并打印 31 A="$A $i" 32 done 33 echo $A 34 }
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1 #得到build变量(脚本内)的绝对路径 2 function get_abs_build_var() 3 { 4 # 得到源码树顶层目录 5 T=$(gettop) 6 # 源码树顶层目录有效性容错 7 if [ ! "$T" ]; then 8 echo "Couldn't locate the top of the tree. Try setting TOP." >&2 9 return 10 fi 11 # 进入顶层目录，设置build变量， 12 # 通过make指定build/core/config.mk文件 13 # --no-print-directory:不要再屏幕上打印"Entering directory.. 14 # CALLED_FROM_SETUP=true：打印出dumpvar-abs-$1所表示的变量的值必须先设置CALLED_FROM_SETUP 15 # BUILD_SYSTEM:设置所有的编译脚本路径 16 (cd $T; CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core 17 command make --no-print-directory -f build/core/config.mk dumpvar-abs-$1) 18 }
1 function get_build_var() 2 { 3 T=$(gettop) 4 if [ ! "$T" ]; then 5 echo "Couldn't locate the top of the tree. Try setting TOP." >&2 6 return 7 fi 8 # 注释同上 唯一不同是目标dumpvar-$1不同 9 (cd $T; CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core 10 command make --no-print-directory -f build/core/config.mk dumpvar-$1) 11 }
题外话：
BUILD_SYSTEM设置的Makefile目录——build/core目录下所有Makefile一览
config.mk详见一篇，此处一笔带过，只为得到CALLED_FROM_SETUP=true BUILD_SYSTEM=build/core command make --no-print-directory -f build/core/config.mk dumpvar-$1”最终执行结果与过程。
1 ..... 2 include $(BUILD_SYSTEM)/dumpvar.mk
继续引入dumpvar.mk
1 # MAKECMDGOALS 变量是传进来的目标dumpvar-abs-$1或 dumpvar-$1的abs-$1或$1 2 dumpvar_goals := 3 $(strip $(patsubst dumpvar-%,%,$(filter dumpvar-%,$(MAKECMDGOALS)))) 4 ifdef dumpvar_goals 5 6 ifneq ($(words $(dumpvar_goals)),1) 7 $(error Only one "dumpvar-" goal allowed. Saw "$(MAKECMDGOALS)") 8 endif 9 10 # If the goal is of the form "dumpvar-abs-VARNAME", then 11 # treat VARNAME as a path and return the absolute path to it. 12 absolute_dumpvar := $(strip $(filter abs-%,$(dumpvar_goals))) 13 # 是否有abs 14 ifdef absolute_dumpvar 15 dumpvar_goals := $(patsubst abs-%,%,$(dumpvar_goals)) 16 ifneq ($(filter /%,$($(dumpvar_goals))),) 17 DUMPVAR_VALUE := $($(dumpvar_goals)) 18 else 19 DUMPVAR_VALUE := $(PWD)/$($(dumpvar_goals)) 20 endif 21 # get_abs_build_var()中dumpvar-abs-$1对应的 22 dumpvar_target := dumpvar-abs-$(dumpvar_goals) 23 else 24 DUMPVAR_VALUE := $($(dumpvar_goals)) 25 # get_build_var()中dumpvar-$1对应的 26 dumpvar_target := dumpvar-$(dumpvar_goals) 27 endif 28 29 .PHONY: $(dumpvar_target) 30 # 执行目标与执行语句 31 $(dumpvar_target): 32 @echo $(DUMPVAR_VALUE)
即打印
其中如有abs则ifdef absolute_dumpvar->DUMPVAR_VALUE := $(PWD)/$($(dumpvar_goals))，打印信息增加pwd绝对路径
如没有 则else->DUMPVAR_VALUE := $($(dumpvar_goals)),打印信息没有绝对路径
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envsetup.sh使用方法：
book@book-virtual-machine:/work/android-5.0.2$ source build/envsetup.sh including device/asus/deb/vendorsetup.sh including device/asus/fugu/vendorsetup.sh including device/asus/tilapia/vendorsetup.sh including device/asus/flo/vendorsetup.sh including device/asus/grouper/vendorsetup.sh including device/samsung/manta/vendorsetup.sh including device/friendly-arm/tiny4412/vendorsetup.sh including device/lge/mako/vendorsetup.sh including device/lge/hammerhead/vendorsetup.sh including device/moto/shamu/vendorsetup.sh including device/generic/mini-emulator-mips/vendorsetup.sh including device/generic/mini-emulator-armv7-a-neon/vendorsetup.sh including device/generic/mini-emulator-arm64/vendorsetup.sh including device/generic/mini-emulator-x86/vendorsetup.sh including device/generic/mini-emulator-x86_64/vendorsetup.sh including sdk/bash_completion/adb.bash book@book-virtual-machine:/work/android-5.0.2$ get_abs_build_var TARGET_PRODUCT /work/android-5.0.2/full