Support Plan 9 dialect

Plan 9 ANSI/POSIX environment is:
* No expr(1)
* sed(1) limits max length of label to 7 characters
* pcc ignores object files that has incorrect extension,
  so should use underlying loader directly.
* No ln(1). Instead use bind(1), but bind isn't persisted to the disk.
  However it isn't efficient to copy git to git subcommands such as git-add.
  Therefore Plan 9 needs exec-wrapper to switch behavior by executable name.
* tar(1) don't have -o option

Signed-off-by: lufia <[email protected]>

Author: lufia

GIT-VERSION-GEN

@@ -26,7 +26,7 @@ else
 	VN="$DEF_VER"
 fi
 
-VN=$(expr "$VN" : v*'\(.*\)')
+VN=${VN#v}
 
 if test -r $GVF
 then

Makefile

@@ -556,6 +556,7 @@ export prefix bindir sharedir sysconfdir gitwebdir perllibdir localedir
 
 # Set our default programs
 CC = cc
+LD = cc
 AR = ar
 RM = rm -f
 DIFF = diff
@@ -792,6 +793,10 @@ ALL_PROGRAMS = $(PROGRAMS) $(SCRIPTS)
 # what 'all' will build but not install in gitexecdir
 OTHER_PROGRAMS = git$X
 
+# what 'all' will build but not install in neither bindir and gitexecdir,
+COMPAT_PROGRAM_OBJS =
+COMPAT_PROGRAMS =
+
 # what test wrappers are needed and 'install' will install, in bindir
 BINDIR_PROGRAMS_NEED_X += git
 BINDIR_PROGRAMS_NEED_X += git-receive-pack
@@ -1882,6 +1887,11 @@ ifndef PAGER_ENV
 PAGER_ENV = LESS=FRX LV=-c
 endif
 
+ifdef USE_EXEC_WRAPPER
+	COMPAT_PROGRAM_OBJS += exec-wrapper.o
+	COMPAT_PROGRAMS += exec-wrapper$X
+endif
+
 QUIET_SUBDIR0  = +$(MAKE) -C # space to separate -C and subdir
 QUIET_SUBDIR1  =
 
@@ -2082,7 +2092,7 @@ profile-fast: profile-clean
 	$(MAKE) PROFILE=USE all
 
 
-all:: $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) $(OTHER_PROGRAMS) GIT-BUILD-OPTIONS
+all:: $(ALL_PROGRAMS) $(SCRIPT_LIB) $(BUILT_INS) $(OTHER_PROGRAMS) $(COMPAT_PROGRAMS) GIT-BUILD-OPTIONS
 ifneq (,$X)
 	$(QUIET_BUILT_IN)$(foreach p,$(patsubst %$X,%,$(filter %$X,$(ALL_PROGRAMS) $(BUILT_INS) git$X)), test -d '$p' -o '$p' -ef '$p$X' || $(RM) '$p';)
 endif
@@ -2142,7 +2152,7 @@ git.sp git.s git.o: EXTRA_CPPFLAGS = \
 	'-DGIT_INFO_PATH="$(infodir_relative_SQ)"'
 
 git$X: git.o GIT-LDFLAGS $(BUILTIN_OBJS) $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) \
 		$(filter %.o,$^) $(LIBS)
 
 help.sp help.s help.o: command-list.h
@@ -2161,10 +2171,11 @@ version.sp version.s version.o: EXTRA_CPPFLAGS = \
 		GIT_CEILING_DIRECTORIES="$(CURDIR)/.." \
 		git rev-parse -q --verify HEAD 2>/dev/null)"'
 
-$(BUILT_INS): git$X
+$(BUILT_INS): git$X $(COMPAT_PROGRAMS)
 	$(QUIET_BUILT_IN)$(RM) $@ && \
 	ln $< $@ 2>/dev/null || \
 	ln -s $< $@ 2>/dev/null || \
+	cp exec-wrapper$X $@ 2>/dev/null || \
 	cp $< $@
 
 config-list.h: generate-configlist.sh
@@ -2370,6 +2381,7 @@ VCSSVN_OBJS += vcs-svn/svndump.o
 
 TEST_OBJS := $(patsubst %$X,%.o,$(TEST_PROGRAMS)) $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 OBJECTS := $(LIB_OBJS) $(BUILTIN_OBJS) $(PROGRAM_OBJS) $(TEST_OBJS) \
+	$(COMPAT_PROGRAM_OBJS) \
 	$(XDIFF_OBJS) \
 	$(VCSSVN_OBJS) \
 	$(FUZZ_OBJS) \
@@ -2490,26 +2502,33 @@ compat/nedmalloc/nedmalloc.sp compat/nedmalloc/nedmalloc.o: EXTRA_CPPFLAGS = \
 compat/nedmalloc/nedmalloc.sp: SP_EXTRA_FLAGS += -Wno-non-pointer-null
 endif
 
+exec-wrapper.sp exec-wrapper.s exec-wrapper.o: EXTRA_CPPFLAGS = \
+	'-DGIT_EXEC_PATH="$(gitexecdir_SQ)"' \
+	'-DBINDIR="$(bindir_relative_SQ)"'
+
+exec-wrapper$X: exec-wrapper.o GIT-LDFLAGS
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^)
+
 git-%$X: %.o GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS)
 
 git-bugreport$X: bugreport.o GIT-LDFLAGS $(GITLIBS)
 	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(LIBS)
 
 git-imap-send$X: imap-send.o $(IMAP_SEND_BUILDDEPS) GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(IMAP_SEND_LDFLAGS) $(LIBS)
 
 git-http-fetch$X: http.o http-walker.o http-fetch.o GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(CURL_LIBCURL) $(LIBS)
 git-http-push$X: http.o http-push.o GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(CURL_LIBCURL) $(EXPAT_LIBEXPAT) $(LIBS)
 
 git-remote-testsvn$X: remote-testsvn.o GIT-LDFLAGS $(GITLIBS) $(VCSSVN_LIB)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(LIBS) \
 	$(VCSSVN_LIB)
 
 $(REMOTE_CURL_ALIASES): $(REMOTE_CURL_PRIMARY)
@@ -2519,7 +2538,7 @@ $(REMOTE_CURL_ALIASES): $(REMOTE_CURL_PRIMARY)
 	cp $< $@
 
 $(REMOTE_CURL_PRIMARY): remote-curl.o http.o http-walker.o GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
 		$(CURL_LIBCURL) $(EXPAT_LIBEXPAT) $(LIBS)
 
 $(LIB_FILE): $(LIB_OBJS)
@@ -2814,7 +2833,7 @@ t/helper/test-svn-fe$X: $(VCSSVN_LIB)
 t/helper/test-tool$X: $(patsubst %,t/helper/%,$(TEST_BUILTINS_OBJS))
 
 t/helper/test-%$X: t/helper/test-%.o GIT-LDFLAGS $(GITLIBS)
-	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(filter %.a,$^) $(LIBS)
+	$(QUIET_LINK)$(LD) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) $(filter %.a,$^) $(LIBS)
 
 check-sha1:: t/helper/test-tool$X
 	t/helper/test-sha1.sh
@@ -2997,6 +3016,7 @@ endif
 		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
 		  ln "$$bindir/git$X" "$$bindir/$$p" 2>/dev/null || \
 		  ln -s "git$X" "$$bindir/$$p" 2>/dev/null || \
+		  cp "exec-wrapper$X" "$$execdir/$$p" 2>/dev/null || \
 		  cp "$$bindir/git$X" "$$bindir/$$p" || exit; } \
 	done && \
 	for p in $(BUILT_INS); do \
@@ -3006,6 +3026,7 @@ endif
 		{ test -z "$(NO_INSTALL_HARDLINKS)" && \
 		  ln "$$execdir/git$X" "$$execdir/$$p" 2>/dev/null || \
 		  ln -s "git$X" "$$execdir/$$p" 2>/dev/null || \
+		  cp "exec-wrapper$X" "$$execdir/$$p" 2>/dev/null || \
 		  cp "$$execdir/git$X" "$$execdir/$$p" || exit; } \
 	done && \
 	remote_curl_aliases="$(REMOTE_CURL_ALIASES)" && \

config.mak.uname

@@ -436,6 +436,7 @@ ifeq ($(uname_S),Windows)
 
 	CC = compat/vcbuild/scripts/clink.pl
 	AR = compat/vcbuild/scripts/lib.pl
+	LD = $(CC)
 	CFLAGS =
 	BASIC_CFLAGS = -nologo -I. -Icompat/vcbuild/include -DWIN32 -D_CONSOLE -DHAVE_STRING_H -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_DEPRECATE
 	COMPAT_OBJS = compat/msvc.o compat/winansi.o \
@@ -518,6 +519,7 @@ ifeq ($(uname_S),NONSTOP_KERNEL)
 	# INLINE='' would just replace one set of warnings with another and
 	# still not compile in c89 mode, due to non-const array initializations.
 	CC = cc -c99
+	LD = $(CC)
 	# Build down-rev compatible objects that don't use our new getopt_long.
 	ifeq ($(uname_R).$(uname_V),J06.21)
 		CC += -WRVU=J06.20
@@ -665,8 +667,10 @@ else
 			BASIC_LDFLAGS += -Wl,--large-address-aware
 		endif
 		CC = gcc
+		LD = $(CC)
 		COMPAT_CFLAGS += -D__USE_MINGW_ANSI_STDIO=0 -DDETECT_MSYS_TTY \
 			-fstack-protector-strong
+		BASIC_LDFLAGS += -fstack-protector-strong
 		EXTLIBS += -lntdll
 		INSTALL = /bin/install
 		NO_R_TO_GCC_LINKER = YesPlease
@@ -699,6 +703,101 @@ ifeq ($(uname_S),QNX)
 	NO_STRCASESTR = YesPlease
 	NO_STRLCPY = YesPlease
 endif
+ifeq ($(uname_S),Plan9)
+	CC = pcc
+	CFLAGS = -FVB+
+	ARFLAGS = uv
+	# pcc don't use mismatched objfiles
+	ifeq ($(objtype),386)
+		LD = 8l
+	endif
+	ifeq ($(objtype),amd64)
+		LD = 6l
+	endif
+	ifeq ($(objtype),arm)
+		LD = 5l
+	endif
+	ifeq ($(objtype),mips)
+		LD = vl
+	endif
+	ifeq ($(objtype),mips64)
+		LD = 4l
+	endif
+	ifeq ($(objtype),power)
+		LD = ql
+	endif
+	ifeq ($(objtype),sparc)
+		LD = kl
+	endif
+	ifeq ($(objtype),spim)
+		LD = 0l
+	endif
+	ifeq ($(objtype),spim64)
+		LD = xl
+	endif
+	BASIC_CFLAGS += -Icompat/plan9
+	BASIC_CFLAGS += -D__PLAN9__
+	BASIC_CFLAGS += -D_POSIX_SOURCE
+	BASIC_CFLAGS += -D_BSD_EXTENSION
+	BASIC_CFLAGS += -D_SUSV2_SOURCE
+	BASIC_CFLAGS += -D_PLAN9_SOURCE
+	BASIC_CFLAGS += -D_RESEARCH_SOURCE
+	BASIC_CFLAGS += -D_REENTRANT_SOURCE
+	BASIC_CFLAGS += -DHAVE_SOCK_OPTS
+	BASIC_CFLAGS += -Dsockaddr_storage=sockaddr_in6
+	BASIC_CFLAGS += -DHOME_ENVIRONMENT=\"home\"
+	BASIC_CFLAGS += -DPATH_ENVIRONMENT=\"path\"
+	BASIC_CFLAGS += -D_PATH_SEP=1
+	BASIC_CFLAGS += -D_PATH_DEFPATH=\"/bin\\x01.\\x01/bin/ape\"
+	COMPAT_CFLAGS += -DHAVE_STDINT_H
+	COMPAT_CFLAGS += -DHAVE_LOCALE_H
+	LDFLAGS = -L/$(objtype)/lib/ape
+
+	NEEDS_CRYPTO_WITH_SSL = YesPlease
+	NEEDS_SYS_PARAM_H = YesPlease
+	NO_NSEC = YesPlease
+	NO_SYMLINK_HEAD = YesPlease
+	NO_GECOS_IN_PWENT = YesPlease
+	NO_GETTEXT = YesPlease
+	NO_SETENV = YesPlease
+	NO_STRCASESTR = YesPlease
+	NO_STRLCPY = YesPlease
+	NO_STRTOUMAX = YesPlease
+	NO_REGEX = YesPlease
+	NO_MKDTEMP = YesPlease
+	NO_UNSETENV = YesPlease
+	NO_INITGROUPS = YesPlease
+	NO_MMAP = YesPlease
+	NO_ST_BLOCKS_IN_STRUCT_STAT = YesPlease
+	NO_STRUCT_ITIMERVAL = YesPlease
+	NO_SETITIMER = YesPlease
+	NO_ICONV = YesPlease
+	NO_SYMLINK_HEAD = YesPlease
+	OPENSSL_SHA1 = YesPlease
+	OPENSSL_SHA256 = YesPlease
+	NO_MEMMEM = YesPlease
+	HAVE_CLOCK_GETTIME = YesPlease
+
+	NO_SVN_TESTS = YesPlease
+	NO_PERL = YesPlease
+	NO_PYTHON = YesPlease
+	NO_TCLTK = YesPlease
+	NO_INSTALL_HARDLINKS = YesPlease
+
+	ETC_GITCONFIG = /sys/lib/git/config
+	ETC_GITATTRIBUTES = /sys/lib/git/attributes
+	USER_GITCONFIG = ~/lib/git/config
+	USER_GITCREDENTIALS = ~/lib/git/credentials
+	USER_GITCREDENTIAL_CACHE = ~/lib/git/credential-cache
+
+	DEFAULT_PAGER = /bin/p
+	PAGER_ENV = terminal=
+	SHELL_PATH = /bin/ape/sh
+	DEFAULT_EDITOR = /bin/ed
+
+	CURL_LDFLAGS = -lcurl -lssl -lcrypto
+	USE_EXEC_WRAPPER = YesPlease
+endif
 
 vcxproj:
 	# Require clean work tree

exec-wrapper.c

@@ -0,0 +1,16 @@
+#include <stdio.h>
+#include <errno.h>
+#include <string.h>
+#include <unistd.h>
+
+int main(int argc, char **argv)
+{
+	/* we should detect git-core path */
+
+	USED(argc);
+	if (execv("/bin/git", argv) < 0) {
+		fprintf(stderr, "%s: %s\n", argv[0], strerror(errno));
+		return 1;
+	}
+	return 0; /* can't happen */
+}

generate-cmdlist.sh

@@ -1,5 +1,10 @@
 #!/bin/sh
 
+if ! echo abc | sed 's/(ab)c/\1/' >/dev/null 2>&1
+then
+	alias sed='sed -E'
+fi
+
 die () {
 	echo "$@" >&2
 	exit 1
@@ -10,24 +15,24 @@ command_list () {
 }
 
 get_categories () {
-	tr ' ' '\n'|
+	tr ' ' '\012'|
 	grep -v '^$' |
 	sort |
 	uniq
 }
 
 category_list () {
 	command_list "$1" |
-	cut -c 40- |
+	awk '{ print substr($0, 40) }' |
 	get_categories
 }
 
 get_synopsis () {
 	sed -n '
-		/^NAME/,/'"$1"'/H
+		/^NAME/,/'"$1"'/h
 		${
 			x
-			s/.*'"$1"' - \(.*\)/N_("\1")/
+			s/.*'"$1"' - (.*)/N_("\1")/
 			p
 		}' "Documentation/$1.txt"
 }
@@ -60,16 +65,23 @@ define_category_names () {
 	echo "};"
 }
 
+if test -z "$(echo -n)"
+then
+	alias print='echo -n'
+else
+	alias print='printf %s'
+fi
+
 print_command_list () {
 	echo "static struct cmdname_help command_list[] = {"
 
 	command_list "$1" |
 	while read cmd rest
 	do
-		printf "	{ \"$cmd\", $(get_synopsis $cmd), 0"
+		print "	{ \"$cmd\", $(get_synopsis $cmd), 0"
 		for cat in $(echo "$rest" | get_categories)
 		do
-			printf " | CAT_$cat"
+			print " | CAT_$cat"
 		done
 		echo " },"
 	done