bootstrap - bison - Git at Google

 #! /bin/sh
 # Bootstrap this package from checked-out sources.

 scriptversion=2025-06-10.02; # UTC

 # Copyright (C) 2003-2025 Free Software Foundation, Inc.
 #
 # This program 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.
 #
 # This program 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 <https://www.gnu.org/licenses/>.

 # Originally written by Paul Eggert.  The canonical version of this
 # script is maintained as top/bootstrap in gnulib. However, to be
 # useful to your package, you should place a copy of it under version
 # control in the top-level directory of your package.  The intent is
 # that all customization can be done with a bootstrap.conf file also
 # maintained in your version control; gnulib comes with a template
 # build-aux/bootstrap.conf to get you started.

 # Please report bugs or propose patches to bug-gnulib@gnu.org.

 me="$0"
 medir=`dirname "$me"`

 # Read the function library and the configuration.
 . "$medir"/bootstrap-funclib.sh

 usage() {
   cat <<EOF
 Usage: $me [OPTION]...
 Bootstrap this package from the checked-out sources.

 Optional environment variables:
   GNULIB_SRCDIR            Specifies the local directory where gnulib
                            sources reside.  Use this if you already
                            have gnulib sources on your machine, and
                            you want to use these sources.
   GNULIB_REFDIR            Specifies the local directory where a gnulib
                            repository (with a .git subdirectory) resides.
                            Use this if you already have gnulib sources
                            and history on your machine, and do not want
                            to waste your bandwidth downloading them again.
                            Only used for phase 1 (--pull).
   GNULIB_URL               URL of the gnulib repository.  The default is
                            $default_gnulib_url,
                            which is Gnulib's upstream repository.
                            Only used for phase 1 (--pull).

 Options:

   --pull                   Do phase 1: Pull files from the network.
   --gen                    Do phase 2: Generate files from local files
                            (no network access).
                            (The default is to do both phases.)

   --gnulib-srcdir=DIRNAME  Specifies the local directory where gnulib
                            sources reside.  Use this if you already
                            have gnulib sources on your machine, and
                            you want to use these sources.  Defaults
                            to \$GNULIB_SRCDIR.
   --gnulib-refdir=DIRNAME  Specifies the local directory where a gnulib
                            repository (with a .git subdirectory) resides.
                            Use this if you already have gnulib sources
                            and history on your machine, and do not want
                            to waste your bandwidth downloading them again.
                            Defaults to \$GNULIB_REFDIR.
                            Only used for phase 1 (--pull).

   --bootstrap-sync         If this bootstrap script is not identical to
                            the version in the local gnulib sources,
                            update this script, and then restart it with
                            /bin/sh or the shell \$CONFIG_SHELL.
   --no-bootstrap-sync      Do not check whether bootstrap is out of sync.

   --copy                   Copy files instead of creating symbolic links.
                            Only used for phase 2 (--gen).
   --force                  Attempt to bootstrap even if the sources seem
                            not to have been checked out.
   --no-git                 Do not use git to update gnulib.  Requires that
                            \$GNULIB_SRCDIR or the --gnulib-srcdir option
                            points to a gnulib repository with the correct
                            revision.
                            Only used for phase 1 (--pull).
   --skip-po                Do not download *.po files.
                            Only used for phase 1 (--pull).
 EOF
   bootstrap_print_option_usage_hook
   cat <<EOF
 If the file bootstrap.conf exists in the same directory as this script, its
 contents are read as shell variables to configure the bootstrap.

 For build prerequisites, environment variables like \$AUTOCONF and \$AMTAR
 are honored.

 Gnulib sources can be fetched in various ways:

  * If GNULIB_SRCDIR is set (either as an environment variable or via the
    --gnulib-srcdir option), then sources are fetched from that local
    directory.  If it is a git repository and the configuration variable
    GNULIB_REVISION is set in bootstrap.conf, then that revision is
    checked out.

  * Otherwise, if this package is in a git repository with a 'gnulib'
    submodule configured, then that submodule is initialized and updated
    and sources are fetched from there.  If GNULIB_REFDIR is set (either
    as an environment variable or via the --gnulib-refdir option) and is
    a git repository, then it is used as a reference.

  * Otherwise, if the 'gnulib' directory does not exist, Gnulib sources
    are cloned into that directory using git from \$GNULIB_URL, defaulting
    to $default_gnulib_url; if GNULIB_REFDIR is set and is a git repository
    its contents may be used to accelerate the process.
    If the configuration variable GNULIB_REVISION is set in bootstrap.conf,
    then that revision is checked out.

  * Otherwise, the existing Gnulib sources in the 'gnulib' directory are
    used.  If it is a git repository and the configuration variable
    GNULIB_REVISION is set in bootstrap.conf, then that revision is
    checked out.

 If you maintain a package and want to pin a particular revision of the
 Gnulib sources that has been tested with your package, then there are
 two possible approaches: either configure a 'gnulib' submodule with the
 appropriate revision, or set GNULIB_REVISION (and if necessary
 GNULIB_URL) in bootstrap.conf.

 Running without arguments will suffice in most cases.
 EOF
 }

 # Parse options.

 # Whether to pull and generate.
 pull=false
 gen=false

 # Whether to use copies instead of symlinks.
 copy=false

 # Use git to update gnulib sources
 use_git=true

 for option
 do
   case $option in
   --help)
     usage
     exit;;
   --version)
     set -e
     echo "bootstrap $scriptversion lib $scriptlibversion"
     echo "$copyright"
     exit 0
     ;;
   --pull)
     pull=true;;
   --gen)
     gen=true;;
   --gnulib-srcdir=*)
     GNULIB_SRCDIR=${option#--gnulib-srcdir=};;
   --gnulib-refdir=*)
     GNULIB_REFDIR=${option#--gnulib-refdir=};;
   --skip-po)
     SKIP_PO=t;;
   --force)
     checkout_only_file=;;
   --copy)
     copy=true;;
   --bootstrap-sync)
     bootstrap_sync=true;;
   --no-bootstrap-sync)
     bootstrap_sync=false;;
   --no-git)
     use_git=false;;
   *)
     bootstrap_option_hook $option || die "$option: unknown option";;
   esac
 done

 # Default is to do both.
 $pull || $gen || pull=true gen=true

 $use_git || test -n "$GNULIB_SRCDIR" \
   || die "Error: --no-git requires \$GNULIB_SRCDIR environment variable" \
          "or --gnulib-srcdir option"
 test -z "$GNULIB_SRCDIR" || test -d "$GNULIB_SRCDIR" \
   || die "Error: \$GNULIB_SRCDIR environment variable or --gnulib-srcdir" \
          "option is specified, but does not denote a directory"

 if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
   die "Bootstrapping from a non-checked-out distribution is risky."
 fi

 check_build_prerequisites $use_git

 if $bootstrap_sync; then
   prepare_GNULIB_SRCDIR
   upgrade_bootstrap "$@"
   # Since we have now upgraded if needed, no need to try it a second time below.
   bootstrap_sync=false
 fi

 echo "$0: Bootstrapping from checked-out $package sources..."

 # Pass GNULIB_SRCDIR and GNULIB_REFDIR to any subsidiary commands that care.
 export GNULIB_SRCDIR
 export GNULIB_REFDIR

 if $pull && { $use_git || test -z "$SKIP_PO"; }; then
   autopull \
       `if $bootstrap_sync; then
          echo ' --bootstrap-sync'
        else
          echo ' --no-bootstrap-sync'
        fi` \
       `if test -z "$checkout_only_file"; then echo ' --force'; fi` \
       `if ! $use_git; then echo ' --no-git'; fi` \
       `if test -n "$SKIP_PO"; then echo ' --skip-po'; fi` \
     || die "could not fetch auxiliary files"
 fi

 if $gen; then
   autogen \
       `if $copy; then echo ' --copy'; fi` \
       `if test -z "$checkout_only_file"; then echo ' --force'; fi` \
     || die "could not generate auxiliary files"
 fi

 # ----------------------------------------------------------------------------

 # Local Variables:
 # eval: (add-hook 'before-save-hook 'time-stamp nil t)
 # time-stamp-start: "scriptversion="
 # time-stamp-format: "%Y-%02m-%02d.%02H"
 # time-stamp-time-zone: "UTC0"
 # time-stamp-end: "; # UTC"
 # End:
	#! /bin/sh
	# Bootstrap this package from checked-out sources.

	scriptversion=2025-06-10.02; # UTC

	# Copyright (C) 2003-2025 Free Software Foundation, Inc.
	#
	# This program 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.
	#
	# This program 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 <https://www.gnu.org/licenses/>.

	# Originally written by Paul Eggert. The canonical version of this
	# script is maintained as top/bootstrap in gnulib. However, to be
	# useful to your package, you should place a copy of it under version
	# control in the top-level directory of your package. The intent is
	# that all customization can be done with a bootstrap.conf file also
	# maintained in your version control; gnulib comes with a template
	# build-aux/bootstrap.conf to get you started.

	# Please report bugs or propose patches to bug-gnulib@gnu.org.

	me="$0"
	medir=`dirname "$me"`

	# Read the function library and the configuration.
	. "$medir"/bootstrap-funclib.sh

	usage() {
	cat <<EOF
	Usage: $me [OPTION]...
	Bootstrap this package from the checked-out sources.

	Optional environment variables:
	GNULIB_SRCDIR Specifies the local directory where gnulib
	sources reside. Use this if you already
	have gnulib sources on your machine, and
	you want to use these sources.
	GNULIB_REFDIR Specifies the local directory where a gnulib
	repository (with a .git subdirectory) resides.
	Use this if you already have gnulib sources
	and history on your machine, and do not want
	to waste your bandwidth downloading them again.
	Only used for phase 1 (--pull).
	GNULIB_URL URL of the gnulib repository. The default is
	$default_gnulib_url,
	which is Gnulib's upstream repository.
	Only used for phase 1 (--pull).

	Options:

	--pull Do phase 1: Pull files from the network.
	--gen Do phase 2: Generate files from local files
	(no network access).
	(The default is to do both phases.)

	--gnulib-srcdir=DIRNAME Specifies the local directory where gnulib
	sources reside. Use this if you already
	have gnulib sources on your machine, and
	you want to use these sources. Defaults
	to \$GNULIB_SRCDIR.
	--gnulib-refdir=DIRNAME Specifies the local directory where a gnulib
	repository (with a .git subdirectory) resides.
	Use this if you already have gnulib sources
	and history on your machine, and do not want
	to waste your bandwidth downloading them again.
	Defaults to \$GNULIB_REFDIR.
	Only used for phase 1 (--pull).

	--bootstrap-sync If this bootstrap script is not identical to
	the version in the local gnulib sources,
	update this script, and then restart it with
	/bin/sh or the shell \$CONFIG_SHELL.
	--no-bootstrap-sync Do not check whether bootstrap is out of sync.

	--copy Copy files instead of creating symbolic links.
	Only used for phase 2 (--gen).
	--force Attempt to bootstrap even if the sources seem
	not to have been checked out.
	--no-git Do not use git to update gnulib. Requires that
	\$GNULIB_SRCDIR or the --gnulib-srcdir option
	points to a gnulib repository with the correct
	revision.
	Only used for phase 1 (--pull).
	--skip-po Do not download *.po files.
	Only used for phase 1 (--pull).
	EOF
	bootstrap_print_option_usage_hook
	cat <<EOF
	If the file bootstrap.conf exists in the same directory as this script, its
	contents are read as shell variables to configure the bootstrap.

	For build prerequisites, environment variables like \$AUTOCONF and \$AMTAR
	are honored.

	Gnulib sources can be fetched in various ways:

	* If GNULIB_SRCDIR is set (either as an environment variable or via the
	--gnulib-srcdir option), then sources are fetched from that local
	directory. If it is a git repository and the configuration variable
	GNULIB_REVISION is set in bootstrap.conf, then that revision is
	checked out.

	* Otherwise, if this package is in a git repository with a 'gnulib'
	submodule configured, then that submodule is initialized and updated
	and sources are fetched from there. If GNULIB_REFDIR is set (either
	as an environment variable or via the --gnulib-refdir option) and is
	a git repository, then it is used as a reference.

	* Otherwise, if the 'gnulib' directory does not exist, Gnulib sources
	are cloned into that directory using git from \$GNULIB_URL, defaulting
	to $default_gnulib_url; if GNULIB_REFDIR is set and is a git repository
	its contents may be used to accelerate the process.
	If the configuration variable GNULIB_REVISION is set in bootstrap.conf,
	then that revision is checked out.

	* Otherwise, the existing Gnulib sources in the 'gnulib' directory are
	used. If it is a git repository and the configuration variable
	GNULIB_REVISION is set in bootstrap.conf, then that revision is
	checked out.

	If you maintain a package and want to pin a particular revision of the
	Gnulib sources that has been tested with your package, then there are
	two possible approaches: either configure a 'gnulib' submodule with the
	appropriate revision, or set GNULIB_REVISION (and if necessary
	GNULIB_URL) in bootstrap.conf.

	Running without arguments will suffice in most cases.
	EOF
	}

	# Parse options.

	# Whether to pull and generate.
	pull=false
	gen=false

	# Whether to use copies instead of symlinks.
	copy=false

	# Use git to update gnulib sources
	use_git=true

	for option
	do
	case $option in
	--help)
	usage
	exit;;
	--version)
	set -e
	echo "bootstrap $scriptversion lib $scriptlibversion"
	echo "$copyright"
	exit 0
	;;
	--pull)
	pull=true;;
	--gen)
	gen=true;;
	--gnulib-srcdir=*)
	GNULIB_SRCDIR=${option#--gnulib-srcdir=};;
	--gnulib-refdir=*)
	GNULIB_REFDIR=${option#--gnulib-refdir=};;
	--skip-po)
	SKIP_PO=t;;
	--force)
	checkout_only_file=;;
	--copy)
	copy=true;;
	--bootstrap-sync)
	bootstrap_sync=true;;
	--no-bootstrap-sync)
	bootstrap_sync=false;;
	--no-git)
	use_git=false;;
	*)
	bootstrap_option_hook $option \|\| die "$option: unknown option";;
	esac
	done

	# Default is to do both.
	$pull \|\| $gen \|\| pull=true gen=true

	$use_git \|\| test -n "$GNULIB_SRCDIR" \
	\|\| die "Error: --no-git requires \$GNULIB_SRCDIR environment variable" \
	"or --gnulib-srcdir option"
	test -z "$GNULIB_SRCDIR" \|\| test -d "$GNULIB_SRCDIR" \
	\|\| die "Error: \$GNULIB_SRCDIR environment variable or --gnulib-srcdir" \
	"option is specified, but does not denote a directory"

	if test -n "$checkout_only_file" && test ! -r "$checkout_only_file"; then
	die "Bootstrapping from a non-checked-out distribution is risky."
	fi

	check_build_prerequisites $use_git

	if $bootstrap_sync; then
	prepare_GNULIB_SRCDIR
	upgrade_bootstrap "$@"
	# Since we have now upgraded if needed, no need to try it a second time below.
	bootstrap_sync=false
	fi

	echo "$0: Bootstrapping from checked-out $package sources..."

	# Pass GNULIB_SRCDIR and GNULIB_REFDIR to any subsidiary commands that care.
	export GNULIB_SRCDIR
	export GNULIB_REFDIR

	if $pull && { $use_git \|\| test -z "$SKIP_PO"; }; then
	autopull \
	`if $bootstrap_sync; then
	echo ' --bootstrap-sync'
	else
	echo ' --no-bootstrap-sync'
	fi` \
	`if test -z "$checkout_only_file"; then echo ' --force'; fi` \
	`if ! $use_git; then echo ' --no-git'; fi` \
	`if test -n "$SKIP_PO"; then echo ' --skip-po'; fi` \
	\|\| die "could not fetch auxiliary files"
	fi

	if $gen; then
	autogen \
	`if $copy; then echo ' --copy'; fi` \
	`if test -z "$checkout_only_file"; then echo ' --force'; fi` \
	\|\| die "could not generate auxiliary files"
	fi

	# ----------------------------------------------------------------------------

	# Local Variables:
	# eval: (add-hook 'before-save-hook 'time-stamp nil t)
	# time-stamp-start: "scriptversion="
	# time-stamp-format: "%Y-%02m-%02d.%02H"
	# time-stamp-time-zone: "UTC0"
	# time-stamp-end: "; # UTC"
	# End: