bootstrap - m4 - Git at Google

 #! /bin/sh

 # bootstrap (GNU M4) version 2008-02-23
 # Written by Gary V. Vaughan  <gary@gnu.org>

 # Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

 # This file is part of GNU M4.
 #
 # GNU M4 is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
 # the Free Software Foundation, either version 3 of the License, or
 # (at your option) any later version.
 #
 # GNU M4 is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with this program.  If not, see <http://www.gnu.org/licenses/>.

 # Usage: $progname [options]

 # -f      --force            bootstrap even when sources are not from git
 # -v      --version          print version information
 # -h,-?   --help             print short or long help message

 # You can also set the following variables to help $progname
 # locate the right tools:
 #   AUTORECONF, GNULIB_TOOL, M4, RM, SED

 # This script bootstraps a git or CVS checkout of GNU M4 by correctly
 # calling out to parts of the GNU Build Platform.  Currently this
 # requires GNU Autoconf 2.60, GNU Automake 1.10.1, and bleeding edge
 # git or CVS snapshots of GNU Gnulib.

 # Report bugs to <bug-m4@gnu.org>

 : ${AUTORECONF=autoreconf}
 : ${GNULIB_TOOL=gnulib-tool}
 : ${RM=rm -f}
 : ${SED=sed}

 # Ensure file names are sorted consistently across platforms.
 LC_ALL=C
 export LC_ALL

 config_macro_dir=m4

 dirname="s,/[^/]*$,,"
 basename="s,^.*/,,g"

 # Work around backward compatibility issue on IRIX 6.5. On IRIX 6.4+, sh
 # is ksh but when the shell is invoked as "sh" and the current value of
 # the _XPG environment variable is not equal to 1 (one), the special
 # positional parameter $0, within a function call, is the name of the
 # function.
 progpath="$0"

 # The name of this program:
 progname=`echo "$progpath" | $SED "$basename"`
 PROGRAM=bootstrap

 # Detect whether this is a version control system checkout or a tarball
 vcs_only_file=HACKING

 # func_echo arg...
 # Echo program name prefixed message.
 func_echo ()
 {
     echo $progname: ${1+"$@"}
 }


 # func_error arg...
 # Echo program name prefixed message to standard error.
 func_error ()
 {
     echo $progname: ${1+"$@"} >&2
 }

 # func_fatal_error arg...
 # Echo program name prefixed message to standard error, and exit.
 func_fatal_error ()
 {
     func_error ${1+"$@"}
     exit $EXIT_FAILURE
 }

 # func_verbose arg...
 # Echo program name prefixed message in verbose mode only.
 func_verbose ()
 {
     $opt_verbose && func_error ${1+"$@"}
 }

 # func_missing_arg argname
 # Echo program name prefixed message to standard error and set global
 # exit_cmd.
 func_missing_arg ()
 {
    func_error "missing argument for $1"
    exit_cmd=exit
 }

 # func_fatal_help arg...
 # Echo program name prefixed message to standard error, followed by
 # a help hint, and exit.
 func_fatal_help ()
 {
     func_error ${1+"$@"}
     func_fatal_error "Try \`$progname --help' for more information."
 }

 # func_missing_arg argname
 # Echo program name prefixed message to standard error and set global
 # exit_cmd.
 func_missing_arg ()
 {
    func_error "missing argument for $1"
    exit_cmd=exit
 }

 # func_usage
 # Echo short help message to standard output and exit.
 func_usage ()
 {
     $SED '/^# Usage:/,/# -h/ {
 	s/^# //; s/^# *$//;
 	s/\$progname/'$progname'/;
 	p;
     }; d' < "$progpath"
     echo
     echo "run \`$progname --help | more' for full usage"
     exit $EXIT_SUCCESS
 }

 # func_help
 # Echo long help message to standard output and exit.
 func_help ()
 {
     $SED '/^# Usage:/,/# Report bugs to/ {
 	s/^# //; s/^# *$//;
 	s/\$progname/'$progname'/;
 	p;
      }; d' < "$progpath"
     exit $EXIT_SUCCESS
 }

 # func_version
 # Echo version message to standard output and exit.
 func_version ()
 {
     $SED '/^# '$PROGRAM' (GNU /,/# warranty; / {
 	s/^# //; s/^# *$//;
 	s/\((C)\)[ 0-9,-]*\( [1-9][0-9]*\)/\1\2/;
 	p;
      }; d' < "$progpath"
      exit $EXIT_SUCCESS
 }

 # func_update
 # Copy $1 to $2 if it is newer.
 func_update ()
 {
   if test -f "$2" && cmp -s "$1" "$2" ; then
     func_verbose "$2 is up-to-date"
   else
     func_echo "copying $1 -> $2"
     cp "$1" "$2"
   fi
 }

 # Parse options once, thoroughly.  This comes as soon as possible in
 # the script to make things like `bootstrap --version' happen quickly.
 {
   # sed scripts:
   my_sed_single_opt='1s/^\(..\).*$/\1/;q'
   my_sed_single_rest='1s/^..\(.*\)$/\1/;q'
   my_sed_long_opt='1s/^\(--[^=]*\)=.*/\1/;q'
   my_sed_long_arg='1s/^--[^=]*=//'

   # this just eases exit handling
   while test $# -gt 0; do
     opt="$1"
     shift
     case $opt in
       # Separate optargs to short options:
       -f|--force)	vcs_only_file=					;;
       -\?|-h)		func_usage					;;
       --help)		func_help					;;
       --version)	func_version					;;
       --)		break						;;
       -*)		func_fatal_help "unrecognized option \`$opt'"	;;
       *)		set -- "$opt" ${1+"$@"};	break		;;
     esac
   done

   # Bail if the options were screwed
   $exit_cmd $EXIT_FAILURE

   if test -n "$vcs_only_file" && test ! -r "$vcs_only_file"; then
     func_fatal_error \
       "Bootstrapping from a non-version-control distribution is risky."
   fi
 }

 ## ---------------- ##
 ## Version control. ##
 ## ---------------- ##

 # gnulib-tool updates m4/.{git,cvs}ignore and lib/.{git,cvs}ignore, and
 # keeping generated files under version control does not make sense.
 # Since lib is entirely ignored, we only need to prepopulate the m4 ignore
 # files with generated files not tracked by gnulib-tool.
 if test -f $config_macro_dir/.gitignore ; then
   :
 else
   func_echo "creating initial $config_macro_dir/.cvsignore"
   cat > $config_macro_dir/.cvsignore <<\EOF
 # files created by gnulib, but that gnulib doesn't track
 *~
 .cvsignore
 .gitignore
 gnulib-comp.m4
 # gnulib-tool edits below here
 EOF
   func_echo "creating initial $config_macro_dir/.gitignore"
   cp $config_macro_dir/.cvsignore $config_macro_dir/.gitignore
 fi

 # See if we can use gnulib's git-merge-changelog merge driver.
 if test -d .git && (git --version) >/dev/null 2>/dev/null ; then
   if git config merge.merge-changelog.driver >/dev/null ; then
     :
   elif (git-merge-changelog --version) >/dev/null 2>/dev/null ; then
     func_echo "initializing git-merge-changelog driver"
     git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
     git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
   else
     func_echo "consider installing git-merge-changelog from gnulib"
   fi
 fi

 ## ---------------------------- ##
 ## Find the gnulib module tree. ##
 ## ---------------------------- ##

 case $GNULIB_TOOL in
     /*  )  gnulibdir=$GNULIB_TOOL ;;		# absolute
     */* )  gnulibdir=`pwd`/$GNULIB_TOOL ;;	# relative
     *   )  gnulibdir=`which "$GNULIB_TOOL"` ;;	# PATH search
 esac

 # Follow symlinks
 while test -h "$gnulibdir"; do

     # Resolve symbolic link.
     sedexpr1='s, -> ,#%%#,'
     sedexpr2='s,^.*#%%#\(.*\)$,\1,p'
     linkval=`ls -l "$gnulibdir" | $SED "$sedexpr1" | $SED -n "$sedexpr2"`
     test -n "$linkval" || break

     case "$linkval" in
 	/* ) gnulibdir="$linkval" ;;
 	* )  gnulibdir=`echo "$gnulibdir" | sed -e 's,/[^/]*$,,'`/"$linkval" ;;
     esac

 done

 gnulibdir=`echo "$gnulibdir" | $SED "$dirname"`

 ## ---------------------- ##
 ## Import Gnulib modules. ##
 ## ---------------------- ##

 func_echo "running: $GNULIB_TOOL --update"
 $GNULIB_TOOL --update || func_fatal_error "gnulib-tool failed"

 ## ----------- ##
 ## Autoreconf. ##
 ## ----------- ##

 func_echo "running: $AUTORECONF --force --verbose --install"
 $AUTORECONF --force --verbose --install || func_fatal_error "autoreconf failed"

 ## ---------------------------------------- ##
 ## Gnulib is more up-to-date than automake. ##
 ## ---------------------------------------- ##

 func_update "$gnulibdir"/build-aux/config.guess build-aux/config.guess
 func_update "$gnulibdir"/build-aux/config.sub build-aux/config.sub
 func_update "$gnulibdir"/build-aux/depcomp build-aux/depcomp
 func_update "$gnulibdir"/build-aux/install-sh build-aux/install-sh
 func_update "$gnulibdir"/build-aux/mdate-sh build-aux/mdate-sh
 func_update "$gnulibdir"/build-aux/missing build-aux/missing
 func_update "$gnulibdir"/build-aux/texinfo.tex build-aux/texinfo.tex
 func_update "$gnulibdir"/doc/COPYINGv3 COPYING
 func_update "$gnulibdir"/doc/INSTALL INSTALL

 exit 0

 # Local variables:
 # eval: (add-hook 'write-file-hooks 'time-stamp)
 # time-stamp-start: "# bootstrap (GNU M4) version "
 # time-stamp-format: "%:y-%02m-%02d"
 # time-stamp-end: "$"
 # End:
	#! /bin/sh

	# bootstrap (GNU M4) version 2008-02-23
	# Written by Gary V. Vaughan <gary@gnu.org>

	# Copyright (C) 2004, 2005, 2006, 2007, 2008 Free Software Foundation, Inc.

	# This file is part of GNU M4.
	#
	# GNU M4 is free software: you can redistribute it and/or modify
	# it under the terms of the GNU General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# GNU M4 is distributed in the hope that it will be useful,
	# but WITHOUT ANY WARRANTY; without even the implied warranty of
	# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	# GNU General Public License for more details.
	#
	# You should have received a copy of the GNU General Public License
	# along with this program. If not, see <http://www.gnu.org/licenses/>.

	# Usage: $progname [options]

	# -f --force bootstrap even when sources are not from git
	# -v --version print version information
	# -h,-? --help print short or long help message

	# You can also set the following variables to help $progname
	# locate the right tools:
	# AUTORECONF, GNULIB_TOOL, M4, RM, SED

	# This script bootstraps a git or CVS checkout of GNU M4 by correctly
	# calling out to parts of the GNU Build Platform. Currently this
	# requires GNU Autoconf 2.60, GNU Automake 1.10.1, and bleeding edge
	# git or CVS snapshots of GNU Gnulib.

	# Report bugs to <bug-m4@gnu.org>

	: ${AUTORECONF=autoreconf}
	: ${GNULIB_TOOL=gnulib-tool}
	: ${RM=rm -f}
	: ${SED=sed}

	# Ensure file names are sorted consistently across platforms.
	LC_ALL=C
	export LC_ALL

	config_macro_dir=m4

	dirname="s,/[^/]*$,,"
	basename="s,^.*/,,g"

	# Work around backward compatibility issue on IRIX 6.5. On IRIX 6.4+, sh
	# is ksh but when the shell is invoked as "sh" and the current value of
	# the _XPG environment variable is not equal to 1 (one), the special
	# positional parameter $0, within a function call, is the name of the
	# function.
	progpath="$0"

	# The name of this program:
	progname=`echo "$progpath" \| $SED "$basename"`
	PROGRAM=bootstrap

	# Detect whether this is a version control system checkout or a tarball
	vcs_only_file=HACKING

	# func_echo arg...
	# Echo program name prefixed message.
	func_echo ()
	{
	echo $progname: ${1+"$@"}
	}


	# func_error arg...
	# Echo program name prefixed message to standard error.
	func_error ()
	{
	echo $progname: ${1+"$@"} >&2
	}

	# func_fatal_error arg...
	# Echo program name prefixed message to standard error, and exit.
	func_fatal_error ()
	{
	func_error ${1+"$@"}
	exit $EXIT_FAILURE
	}

	# func_verbose arg...
	# Echo program name prefixed message in verbose mode only.
	func_verbose ()
	{
	$opt_verbose && func_error ${1+"$@"}
	}

	# func_missing_arg argname
	# Echo program name prefixed message to standard error and set global
	# exit_cmd.
	func_missing_arg ()
	{
	func_error "missing argument for $1"
	exit_cmd=exit
	}

	# func_fatal_help arg...
	# Echo program name prefixed message to standard error, followed by
	# a help hint, and exit.
	func_fatal_help ()
	{
	func_error ${1+"$@"}
	func_fatal_error "Try \`$progname --help' for more information."
	}

	# func_missing_arg argname
	# Echo program name prefixed message to standard error and set global
	# exit_cmd.
	func_missing_arg ()
	{
	func_error "missing argument for $1"
	exit_cmd=exit
	}

	# func_usage
	# Echo short help message to standard output and exit.
	func_usage ()
	{
	$SED '/^# Usage:/,/# -h/ {
	s/^# //; s/^# *$//;
	s/\$progname/'$progname'/;
	p;
	}; d' < "$progpath"
	echo
	echo "run \`$progname --help \| more' for full usage"
	exit $EXIT_SUCCESS
	}

	# func_help
	# Echo long help message to standard output and exit.
	func_help ()
	{
	$SED '/^# Usage:/,/# Report bugs to/ {
	s/^# //; s/^# *$//;
	s/\$progname/'$progname'/;
	p;
	}; d' < "$progpath"
	exit $EXIT_SUCCESS
	}

	# func_version
	# Echo version message to standard output and exit.
	func_version ()
	{
	$SED '/^# '$PROGRAM' (GNU /,/# warranty; / {
	s/^# //; s/^# *$//;
	s/\((C)\)[ 0-9,-]\( [1-9][0-9]\)/\1\2/;
	p;
	}; d' < "$progpath"
	exit $EXIT_SUCCESS
	}

	# func_update
	# Copy $1 to $2 if it is newer.
	func_update ()
	{
	if test -f "$2" && cmp -s "$1" "$2" ; then
	func_verbose "$2 is up-to-date"
	else
	func_echo "copying $1 -> $2"
	cp "$1" "$2"
	fi
	}

	# Parse options once, thoroughly. This comes as soon as possible in
	# the script to make things like `bootstrap --version' happen quickly.
	{
	# sed scripts:
	my_sed_single_opt='1s/^\(..\).*$/\1/;q'
	my_sed_single_rest='1s/^..\(.*\)$/\1/;q'
	my_sed_long_opt='1s/^\(--[^=]\)=./\1/;q'
	my_sed_long_arg='1s/^--[^=]*=//'

	# this just eases exit handling
	while test $# -gt 0; do
	opt="$1"
	shift
	case $opt in
	# Separate optargs to short options:
	-f\|--force) vcs_only_file= ;;
	-\?\|-h) func_usage ;;
	--help) func_help ;;
	--version) func_version ;;
	--) break ;;
	-*) func_fatal_help "unrecognized option \`$opt'" ;;
	*) set -- "$opt" ${1+"$@"}; break ;;
	esac
	done

	# Bail if the options were screwed
	$exit_cmd $EXIT_FAILURE

	if test -n "$vcs_only_file" && test ! -r "$vcs_only_file"; then
	func_fatal_error \
	"Bootstrapping from a non-version-control distribution is risky."
	fi
	}

	## ---------------- ##
	## Version control. ##
	## ---------------- ##

	# gnulib-tool updates m4/.{git,cvs}ignore and lib/.{git,cvs}ignore, and
	# keeping generated files under version control does not make sense.
	# Since lib is entirely ignored, we only need to prepopulate the m4 ignore
	# files with generated files not tracked by gnulib-tool.
	if test -f $config_macro_dir/.gitignore ; then
	:
	else
	func_echo "creating initial $config_macro_dir/.cvsignore"
	cat > $config_macro_dir/.cvsignore <<\EOF
	# files created by gnulib, but that gnulib doesn't track
	*~
	.cvsignore
	.gitignore
	gnulib-comp.m4
	# gnulib-tool edits below here
	EOF
	func_echo "creating initial $config_macro_dir/.gitignore"
	cp $config_macro_dir/.cvsignore $config_macro_dir/.gitignore
	fi

	# See if we can use gnulib's git-merge-changelog merge driver.
	if test -d .git && (git --version) >/dev/null 2>/dev/null ; then
	if git config merge.merge-changelog.driver >/dev/null ; then
	:
	elif (git-merge-changelog --version) >/dev/null 2>/dev/null ; then
	func_echo "initializing git-merge-changelog driver"
	git config merge.merge-changelog.name 'GNU-style ChangeLog merge driver'
	git config merge.merge-changelog.driver 'git-merge-changelog %O %A %B'
	else
	func_echo "consider installing git-merge-changelog from gnulib"
	fi
	fi

	## ---------------------------- ##
	## Find the gnulib module tree. ##
	## ---------------------------- ##

	case $GNULIB_TOOL in
	/* ) gnulibdir=$GNULIB_TOOL ;; # absolute
	/ ) gnulibdir=`pwd`/$GNULIB_TOOL ;; # relative
	* ) gnulibdir=`which "$GNULIB_TOOL"` ;; # PATH search
	esac

	# Follow symlinks
	while test -h "$gnulibdir"; do

	# Resolve symbolic link.
	sedexpr1='s, -> ,#%%#,'
	sedexpr2='s,^.#%%#\(.\)$,\1,p'
	linkval=`ls -l "$gnulibdir" \| $SED "$sedexpr1" \| $SED -n "$sedexpr2"`
	test -n "$linkval" \|\| break

	case "$linkval" in
	/* ) gnulibdir="$linkval" ;;
	* ) gnulibdir=`echo "$gnulibdir" \| sed -e 's,/[^/]*$,,'`/"$linkval" ;;
	esac

	done

	gnulibdir=`echo "$gnulibdir" \| $SED "$dirname"`

	## ---------------------- ##
	## Import Gnulib modules. ##
	## ---------------------- ##

	func_echo "running: $GNULIB_TOOL --update"
	$GNULIB_TOOL --update \|\| func_fatal_error "gnulib-tool failed"

	## ----------- ##
	## Autoreconf. ##
	## ----------- ##

	func_echo "running: $AUTORECONF --force --verbose --install"
	$AUTORECONF --force --verbose --install \|\| func_fatal_error "autoreconf failed"

	## ---------------------------------------- ##
	## Gnulib is more up-to-date than automake. ##
	## ---------------------------------------- ##

	func_update "$gnulibdir"/build-aux/config.guess build-aux/config.guess
	func_update "$gnulibdir"/build-aux/config.sub build-aux/config.sub
	func_update "$gnulibdir"/build-aux/depcomp build-aux/depcomp
	func_update "$gnulibdir"/build-aux/install-sh build-aux/install-sh
	func_update "$gnulibdir"/build-aux/mdate-sh build-aux/mdate-sh
	func_update "$gnulibdir"/build-aux/missing build-aux/missing
	func_update "$gnulibdir"/build-aux/texinfo.tex build-aux/texinfo.tex
	func_update "$gnulibdir"/doc/COPYINGv3 COPYING
	func_update "$gnulibdir"/doc/INSTALL INSTALL

	exit 0

	# Local variables:
	# eval: (add-hook 'write-file-hooks 'time-stamp)
	# time-stamp-start: "# bootstrap (GNU M4) version "
	# time-stamp-format: "%:y-%02m-%02d"
	# time-stamp-end: "$"
	# End: