task chain 构建

base.class

  148 addtask fetch
  149 do_fetch[dirs] = "${DL_DIR}"
  150 do_fetch[file-checksums] = "${@bb.fetch.get_checksum_file_list(d)}"
  151 do_fetch[file-checksums] += " ${@get_lic_checksum_file_list(d)}"
  152 do_fetch[vardeps] += "SRCREV"
  153 python base_do_fetch() {
  154 +-- 11 lines: src_uri = (d.getVar('SRC_URI') or "").split()-----------------------------------------------------------------------------------------------------------------------------------------------------
  165 


  166 addtask unpack after do_fetch
  167 do_unpack[dirs] = "${WORKDIR}"
  168 
>>169 do_unpack[cleandirs] = "${@d.getVar('S') if os.path.normpath(d.getVar('S')) != os.path.normpath(d.getVar('WORKDIR')) else os.path.join('${S}', 'patches')}"
  170 
  171 python base_do_unpack() {
  172 +-- 10 lines: src_uri = (d.getVar('SRC_URI') or "").split()-----------------------------------------------------------------------------------------------------------------------------------------------------
  182 
  304 addtask configure after do_patch
  305 do_configure[dirs] = "${B}"
  306 base_do_configure() {
  307 +-- 16 lines: if [ -n "${CONFIGURESTAMPFILE}" -a -e "${CONFIGURESTAMPFILE}" ]; then-----------------------------------------------------------------------------------------------------------------------------
  323 
  324 addtask compile after do_configure
  325 do_compile[dirs] = "${B}"
  326 base_do_compile() {
  327 +--  6 lines: if [ -e Makefile -o -e makefile -o -e GNUmakefile ]; then-----------------------------------------------------------------------------------------------------------------------------------------
  333 
  334 addtask install after do_compile
  335 do_install[dirs] = "${B}"
  336 # Remove and re-create ${D} so that is it guaranteed to be empty
  337 do_install[cleandirs] = "${D}"
  338 
>>339 base_do_install() {
--340         :
  341 }
  347 addtask build after do_populate_sysroot                                                                                                                                                                         
  348 do_build[noexec] = "1"
  349 do_build[recrdeptask] += "do_deploy"
>>350 do_build () {
--351         :
  352 }
  720 addtask cleansstate after do_clean
  721 python do_cleansstate() {
  722 +--  2 lines: sstate_clean_cachefiles(d)------------------------------------------------------------------------------------------------------------------------------------------------------------------------
  724 addtask cleanall after do_cleansstate
  725 do_cleansstate[nostamp] = "1"
  726 
  727 python do_cleanall() {
  728 +-- 10 lines: src_uri = (d.getVar('SRC_URI') or "").split()-----------------------------------------------------------------------------------------------------------------------------------------------------
  738 do_cleanall[nostamp] = "1"
  739 

patch.bbclass

 96 python patch_do_patch() {
 97 +-- 66 lines: import oe.patch-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
163 patch_do_patch[vardepsexclude] = "PATCHRESOLVE"
164 
165 addtask patch after do_unpack
166 do_patch[dirs] = "${WORKDIR}"
167 do_patch[depends] = "${PATCHDEPENDENCY}"

staging.bbclass

 94 addtask populate_sysroot after do_install
 95 
 96 SYSROOT_PREPROCESS_FUNCS ?= ""
 97 SYSROOT_DESTDIR = "${WORKDIR}/sysroot-destdir"
 98 
 99 python do_populate_sysroot () {
100 +-- 16 lines: SYSROOT 'version' 2---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
116 

utility-tasks.bbclass

 23 addtask clean
 24 do_clean[nostamp] = "1"
 25 python do_clean() {
 26 +-- 12 lines: """clear the build and temp directories"""----------------------------------------------------------------------------------------------------------------------------------------------------------
 38 

这样就形成了2条链条：

1. fetch ----> unpack -----> patch ----> configure ----> compile ----> install ----> populate_sysroot ----> build
2. clean ----> cleansstate ----> cleanall

继承

    4 inherit patch
    5 inherit staging

    7 inherit mirrors
    8 inherit utils
    9 inherit utility-tasks
   10 inherit metadata_scm
   11 inherit logging

事件处理器

>>226 addhandler base_eventhandler
>>227 base_eventhandler[eventmask] = "bb.event.ConfigParsed bb.event.MultiConfigParsed bb.event.BuildStarted bb.event.RecipePreFinalise bb.event.RecipeParsed"                                                        
  228 python base_eventhandler()

匿名逻辑（默认处理）

1. Handle backfilling
2. Handle PACKAGECONFIG
3. ....