8210283: Support git as an SCM alternative in the build

.gitignore

@@ -0,0 +1,18 @@
+/build/
+/dist/
+/.idea/
+nbproject/private/
+/webrev
+/.src-rev
+/.jib/
+/.hgtip
+.DS_Store
+.metadata/
+.recommenders/
+test/nashorn/script/external
+test/nashorn/lib
+NashornProfile.txt
+**/JTreport/**
+**/JTwork/**
+/jdk/make/closed/
+/jdk/src/closed/

common/autoconf/basics.m4

@@ -1,5 +1,5 @@
 #
-# Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2022, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -640,6 +640,7 @@ AC_DEFUN_ONCE([BASIC_SETUP_COMPLEX_TOOLS],
   fi
   AC_PATH_PROGS(READELF, [readelf greadelf])
   AC_PATH_PROG(HG, hg)
+  AC_PATH_PROG(GIT, git)
   AC_PATH_PROG(STAT, stat)
   AC_PATH_PROG(TIME, time)
   # Check if it's GNU time

common/autoconf/generated-configure.sh

@@ -832,6 +832,7 @@ DSYMUTIL
 IS_GNU_TIME
 TIME
 STAT
+GIT
 HG
 READELF
 OTOOL
@@ -3108,7 +3109,7 @@ ac_configure="$SHELL $ac_aux_dir/configure"  # Please don't use this var.
 
 # Include these first...
 #
-# Copyright (c) 2011, 2013, Oracle and/or its affiliates. All rights reserved.
+# Copyright (c) 2011, 2022, Oracle and/or its affiliates. All rights reserved.
 # DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 #
 # This code is free software; you can redistribute it and/or modify it
@@ -3872,7 +3873,7 @@ fi
 #CUSTOM_AUTOCONF_INCLUDE
 
 # Do not change or remove the following line, it is needed for consistency checks:
-DATE_WHEN_GENERATED=1573688723
+DATE_WHEN_GENERATED=1649266272
 
 ###############################################################################
 #
@@ -10449,6 +10450,46 @@ $as_echo "no" >&6; }
 fi
 
 
+  # Extract the first word of "git", so it can be a program name with args.
+set dummy git; ac_word=$2
+{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5
+$as_echo_n "checking for $ac_word... " >&6; }
+if ${ac_cv_path_GIT+:} false; then :
+  $as_echo_n "(cached) " >&6
+else
+  case $GIT in
+  [\\/]* | ?:[\\/]*)
+  ac_cv_path_GIT="$GIT" # Let the user override the test with a path.
+  ;;
+  *)
+  as_save_IFS=$IFS; IFS=$PATH_SEPARATOR
+for as_dir in $PATH
+do
+  IFS=$as_save_IFS
+  test -z "$as_dir" && as_dir=.
+    for ac_exec_ext in '' $ac_executable_extensions; do
+  if as_fn_executable_p "$as_dir/$ac_word$ac_exec_ext"; then
+    ac_cv_path_GIT="$as_dir/$ac_word$ac_exec_ext"
+    $as_echo "$as_me:${as_lineno-$LINENO}: found $as_dir/$ac_word$ac_exec_ext" >&5
+    break 2
+  fi
+done
+  done
+IFS=$as_save_IFS
+
+  ;;
+esac
+fi
+GIT=$ac_cv_path_GIT
+if test -n "$GIT"; then
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: $GIT" >&5
+$as_echo "$GIT" >&6; }
+else
+  { $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
+$as_echo "no" >&6; }
+fi
+
+
   # Extract the first word of "stat", so it can be a program name with args.
 set dummy stat; ac_word=$2
 { $as_echo "$as_me:${as_lineno-$LINENO}: checking for $ac_word" >&5

common/autoconf/spec.gmk.in

@@ -533,6 +533,7 @@ READELF:=@READELF@
 EXPR:=@EXPR@
 FILE:=@FILE@
 HG:=@HG@
+GIT:=@GIT@
 OBJCOPY:=@OBJCOPY@
 SETFILE:=@SETFILE@
 XATTR:=@XATTR@

make/common/MakeBase.gmk

@@ -299,10 +299,13 @@ endef
 # These should not be := assignments, only used from the root Makefile.
 HG_VERSION = $(shell $(HG) version 2> /dev/null)
 HG_DIRECTORY=.hg
+GIT_DIRECTORY=.git
 HGTIP_FILENAME=.hgtip
 HG_SEARCH = ./REPO ./*/REPO ./*/*/REPO ./*/*/*/REPO
 REPO_LIST = $(patsubst ./%,%,$(patsubst %/,%,$(sort $(dir \
-    $(shell $(CD) $(SRC_ROOT) ; ( $(LS) -d $(HG_SEARCH:%/REPO=%/$(HG_DIRECTORY)) ; \
+    $(shell $(CD) $(SRC_ROOT) ; ( \
+        $(LS) -d $(HG_SEARCH:%/REPO=%/$(HG_DIRECTORY)) ; \
+        $(LS) -d $(HG_SEARCH:%/REPO=%/$(GIT_DIRECTORY)) ; \
         $(LS) $(HG_SEARCH:%/REPO=%/$(HGTIP_FILENAME)) ) \
         2> /dev/null)))))
 
@@ -315,6 +318,12 @@ define GetSourceTips
 	  elif [ -d $${i}/$(HG_DIRECTORY) -a "$(HG_VERSION)" != "" ] ; then \
 	    $(PRINTF) " %s:%s" \
 	        "$${i}" `$(HG) tip --repository $${i} --template '{node|short}\n'` ; \
+	  elif [ -d $${i}/$(GIT_DIRECTORY) -a "$(GIT)" != "" ] ; then \
+	    porcelain="`$(GIT) -C $${i} status --porcelain`" ; \
+	    $(PRINTF) " %s:%s%s\n" \
+	        "$${i}" \
+	        "`$(GIT) -C $${i} log -n1 --format=%H | $(CUT) -c1-12`" \
+	        "`if test -n \"$${porcelain}\"; then printf '+'; fi`" ; \
 	  elif [ -f $${i}/$(HGTIP_FILENAME) ] ; then \
 	    $(PRINTF) " %s:%s" \
 	        "$${i}" `$(CAT) $${i}/$(HGTIP_FILENAME)` ; \
@@ -325,7 +334,11 @@ endef
 
 # Create the HGTIP_FILENAME file. Called from jdk/make/closed/bundles.gmk
 define CreateHgTip
-	$(HG) tip --repository $1 --template '{node|short}\n' > $1/$(HGTIP_FILENAME); \
+	if [ -d $1/$(HG_DIRECTORY) -a "$(HG_VERSION)" != "" ] ; then \
+	  $(HG) tip --repository $1 --template '{node|short}\n' > $1/$(HGTIP_FILENAME); \
+	elif [ -d $1/$(GIT_DIRECTORY) -a "$(GIT)" != "" ] ; then \
+	  $(GIT) -C $1 log -n1 --format=%H | $(CUT) -c1-12 > $1/$(HGTIP_FILENAME); \
+	fi ; \
 	$(ECHO) $1/$(HGTIP_FILENAME)
 endef