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gnulib-tool.sh
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gnulib-tool.sh
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#! /bin/sh
#
# Copyright (C) 2002-2024 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/>.
#
# This program is meant for authors or maintainers which want to import
# modules from gnulib into their packages.
# CODING STYLE for this file:
# * Indentation: Indent by 2 spaces. Indent case clauses by 2 spaces as well.
# * Shell variable references: Use double-quote around shell variable
# references always (except when word splitting is explicitly desired),
# even when you know the double-quote are not needed. This style tends to
# avoid undesired word splitting caused by omitted double-quotes (the
# number one mistake in shell scripts).
# When the referenced variable can only have a finite number of possible
# values and these values are all simple words (e.g. true and false), it's
# OK to omit the double-quotes.
# * Backquotes:
# - Use backquotes like in `command`, not $(command).
# - Don't use `command` inside double-quotes. Instead assign the result of
# `command` to a variable, and use the value of the variable afterwards.
# * Functions:
# - All functions that don't emulate a program or shell built-in have a name
# that starts with 'func_'.
# - Document the implicit and explicit arguments of all functions, as well
# as their output variables and side effects.
# * Use test condition instead of [ condition ].
# * Minimize the use of eval; when you need it, make sure the string to be
# evaluated has a very simple syntactic structure.
progname=$0
package=gnulib
nl='
'
IFS=" "" $nl"
# You can set AUTOCONFPATH to empty if autoconf ≥ 2.64 is already in your PATH.
AUTOCONFPATH=
#case $USER in
# bruno )
# AUTOCONFBINDIR=/arch/x86-linux/gnu-inst-autoconf/2.64/bin
# AUTOCONFPATH="eval env PATH=${AUTOCONFBINDIR}:\$PATH "
# ;;
#esac
# You can set AUTOMAKEPATH to empty if automake ≥ 1.14 is already in your PATH.
AUTOMAKEPATH=
# You can set GETTEXTPATH to empty if autopoint ≥ 0.15 is already in your PATH.
GETTEXTPATH=
# You can set LIBTOOLPATH to empty if libtoolize 2.x is already in your PATH.
LIBTOOLPATH=
# If you didn't set AUTOCONFPATH and AUTOMAKEPATH, you can also set the
# variables AUTOCONF, AUTOHEADER, ACLOCAL, AUTOMAKE, AUTORECONF individually.
if test -z "${AUTOCONF}" || test -n "${AUTOCONFPATH}"; then
AUTOCONF="${AUTOCONFPATH}autoconf"
fi
if test -z "${AUTOHEADER}" || test -n "${AUTOCONFPATH}"; then
AUTOHEADER="${AUTOCONFPATH}autoheader"
fi
if test -z "${ACLOCAL}" || test -n "${AUTOMAKEPATH}"; then
ACLOCAL="${AUTOMAKEPATH}aclocal"
fi
if test -z "${AUTOMAKE}" || test -n "${AUTOMAKEPATH}"; then
AUTOMAKE="${AUTOMAKEPATH}automake"
fi
if test -z "${AUTORECONF}" || test -n "${AUTOCONFPATH}"; then
AUTORECONF="${AUTOCONFPATH}autoreconf"
fi
# If you didn't set GETTEXTPATH, you can also set the variable AUTOPOINT.
if test -z "${AUTOPOINT}" || test -n "${GETTEXTPATH}"; then
AUTOPOINT="${GETTEXTPATH}autopoint"
fi
# If you didn't set LIBTOOLPATH, you can also set the variable LIBTOOLIZE.
if test -z "${LIBTOOLIZE}" || test -n "${LIBTOOLPATH}"; then
LIBTOOLIZE="${LIBTOOLPATH}libtoolize"
fi
# You can set MAKE.
if test -z "${MAKE}"; then
MAKE=make
fi
# When using GNU sed, turn off as many GNU extensions as possible,
# to minimize the risk of accidentally using non-portable features.
# However, do this only for gnulib-tool itself, not for the code that
# gnulib-tool generates, since we don't want "sed --posix" to leak
# into makefiles. And do it only for sed versions 4.2 or newer,
# because "sed --posix" is buggy in GNU sed 4.1.5, see
# <https://lists.gnu.org/r/bug-gnulib/2009-02/msg00225.html>.
if (alias) > /dev/null 2>&1 \
&& echo | sed --posix -e d >/dev/null 2>&1 \
&& case `sed --version | sed -e 's/^[^0-9]*//' -e 1q` in \
[1-3]* | 4.[01]*) false;; \
*) true;; \
esac \
; then
# Define sed as an alias.
# It is not always possible to use aliases. Aliases are guaranteed to work
# if the executing shell is bash and either it is invoked as /bin/sh or
# is a version >= 2.0, supporting shopt. This is the common case.
# Two other approaches (use of a variable $sed or of a function func_sed
# instead of an alias) require massive, fragile code changes.
# An other approach (use of function sed) requires `which sed` - but
# 'which' is hard to emulate, due to missing "test -x" on some platforms.
if test -n "$BASH_VERSION"; then
shopt -s expand_aliases >/dev/null 2>&1
fi
alias sed='sed --posix'
fi
# sed_noop is a sed expression that does nothing.
# An empty expression does not work with the native 'sed' on AIX 6.1.
sed_noop='s,x,x,'
# sed_comments is true or false, depending whether 'sed' supports comments.
# AIX 5.3 sed barfs over indented comments.
if echo fo | sed -e 's/f/g/
# s/o/u/
# indented comment
s/o/e/' 2>/dev/null | grep ge > /dev/null; then
sed_comments=true
else
sed_comments=false
fi
# func_usage
# outputs to stdout the --help usage message.
func_usage ()
{
echo "\
Usage: gnulib-tool --list
gnulib-tool --find filename
gnulib-tool --import [module1 ... moduleN]
gnulib-tool --add-import [module1 ... moduleN]
gnulib-tool --remove-import [module1 ... moduleN]
gnulib-tool --update
gnulib-tool --create-testdir --dir=directory [module1 ... moduleN]
gnulib-tool --create-megatestdir --dir=directory [module1 ... moduleN]
gnulib-tool --test --dir=directory [module1 ... moduleN]
gnulib-tool --megatest --dir=directory [module1 ... moduleN]
gnulib-tool --extract-description module
gnulib-tool --extract-comment module
gnulib-tool --extract-status module
gnulib-tool --extract-notice module
gnulib-tool --extract-applicability module
gnulib-tool --extract-filelist module
gnulib-tool --extract-dependencies module
gnulib-tool --extract-recursive-dependencies module
gnulib-tool --extract-autoconf-snippet module
gnulib-tool --extract-automake-snippet module
gnulib-tool --extract-include-directive module
gnulib-tool --extract-link-directive module
gnulib-tool --extract-recursive-link-directive module
gnulib-tool --extract-license module
gnulib-tool --extract-maintainer module
gnulib-tool --extract-tests-module module
gnulib-tool --copy-file file [destination]
Operation modes:
--list print the available module names
--find find the modules which contain the specified file
--import import the given modules into the current package
--add-import augment the list of imports from gnulib into the
current package, by adding the given modules;
if no modules are specified, update the current
package from the current gnulib
--remove-import reduce the list of imports from gnulib into the
current package, by removing the given modules
--update update the current package, restore files omitted
from version control
--create-testdir create a scratch package with the given modules
--create-megatestdir create a mega scratch package with the given modules
one by one and all together
--test test the combination of the given modules
(recommended to use CC=\"gcc -Wall\" here)
--megatest test the given modules one by one and all together
(recommended to use CC=\"gcc -Wall\" here)
--extract-description extract the description
--extract-comment extract the comment
--extract-status extract the status (obsolete etc.)
--extract-notice extract the notice or banner
--extract-applicability extract the applicability
--extract-filelist extract the list of files
--extract-dependencies extract the dependencies
--extract-recursive-dependencies extract the dependencies of the module
and its dependencies, recursively, all
together, but without the conditions
--extract-autoconf-snippet extract the snippet for configure.ac
--extract-automake-snippet extract the snippet for library makefile
--extract-include-directive extract the #include directive
--extract-link-directive extract the linker directive
--extract-recursive-link-directive extract the linker directive of the
module and its dependencies,
recursively, all together
--extract-license report the license terms of the source files
under lib/
--extract-maintainer report the maintainer(s) inside gnulib
--extract-tests-module report the unit test module, if it exists
--copy-file copy a file that is not part of any module
--help Show this help text.
--version Show version and authorship information.
General options:
--dir=DIRECTORY Specify the target directory.
For --import, this specifies where your
configure.ac can be found. Defaults to current
directory.
--local-dir=DIRECTORY Specify a local override directory where to look
up files before looking in gnulib's directory.
--verbose Increase verbosity. May be repeated.
--quiet Decrease verbosity. May be repeated.
Options for --import, --add/remove-import, --update:
--dry-run Only print what would have been done.
Options for --import, --add/remove-import:
--with-tests Include unit tests for the included modules.
Options for --create-[mega]testdir, --[mega]test:
--without-tests Don't include unit tests for the included modules.
Options for --import, --add/remove-import,
--create-[mega]testdir, --[mega]test:
--with-obsolete Include obsolete modules when they occur among the
dependencies. By default, dependencies to obsolete
modules are ignored.
--with-c++-tests Include even unit tests for C++ interoperability.
--without-c++-tests Exclude unit tests for C++ interoperability.
--with-longrunning-tests
Include even unit tests that are long-runners.
--without-longrunning-tests
Exclude unit tests that are long-runners.
--with-privileged-tests
Include even unit tests that require root
privileges.
--without-privileged-tests
Exclude unit tests that require root privileges.
--with-unportable-tests
Include even unit tests that fail on some platforms.
--without-unportable-tests
Exclude unit tests that fail on some platforms.
--with-all-tests Include all kinds of problematic unit tests.
--avoid=MODULE Avoid including the given MODULE. Useful if you
have code that provides equivalent functionality.
This option can be repeated.
--conditional-dependencies
Support conditional dependencies (may save configure
time and object code).
--no-conditional-dependencies
Don't use conditional dependencies.
--libtool Use libtool rules.
--no-libtool Don't use libtool rules.
Options for --import, --add/remove-import:
--lib=LIBRARY Specify the library name. Defaults to 'libgnu'.
--source-base=DIRECTORY
Directory relative to --dir where source code is
placed (default \"lib\").
--m4-base=DIRECTORY Directory relative to --dir where *.m4 macros are
placed (default \"m4\").
--po-base=DIRECTORY Directory relative to --dir where *.po files are
placed (default \"po\").
--doc-base=DIRECTORY Directory relative to --dir where doc files are
placed (default \"doc\").
--tests-base=DIRECTORY
Directory relative to --dir where unit tests are
placed (default \"tests\").
--aux-dir=DIRECTORY Directory relative to --dir where auxiliary build
tools are placed (default comes from configure.ac).
--gnu-make Output for GNU Make instead of for the default
Automake
--lgpl[=2|=3orGPLv2|=3]
Abort if modules aren't available under the LGPL.
Also modify license template from GPL to LGPL.
The version number of the LGPL can be specified;
the default is currently LGPLv3.
--makefile-name=NAME Name of makefile in the source-base and tests-base
directories (default \"Makefile.am\", or
\"Makefile.in\" if --gnu-make).
--tests-makefile-name=NAME
Name of makefile in the tests-base directory
(default as specified through --makefile-name).
--automake-subdir Specify that the makefile in the source-base
directory be generated in such a way that it can
be 'include'd from the toplevel Makefile.am.
--automake-subdir-tests
Likewise, but for the tests directory.
--macro-prefix=PREFIX Specify the prefix of the macros 'gl_EARLY' and
'gl_INIT'. Default is 'gl'.
--po-domain=NAME Specify the prefix of the i18n domain. Usually use
the package name. A suffix '-gnulib' is appended.
--witness-c-macro=NAME Specify the C macro that is defined when the
sources in this directory are compiled or used.
--vc-files Update version control related files.
--no-vc-files Don't update version control related files
(.gitignore and/or .cvsignore).
Options for --create-[mega]testdir, --[mega]test:
--single-configure Generate a single configure file, not a separate
configure file for the tests directory.
Options for --import, --add/remove-import, --update,
--create-[mega]testdir, --[mega]test:
-s, --symbolic, --symlink Make symbolic links instead of copying files.
--local-symlink Make symbolic links instead of copying files, only
for files from the local override directory.
-h, --hardlink Make hard links instead of copying files.
--local-hardlink Make hard links instead of copying files, only
for files from the local override directory.
Options for --import, --add/remove-import, --update:
-S, --more-symlinks Deprecated; equivalent to --symlink.
-H, --more-hardlinks Deprecated; equivalent to --hardlink.
Report bugs to <[email protected]>."
}
# func_version
# outputs to stdout the --version message.
func_version ()
{
func_gnulib_dir
if test -d "$gnulib_dir"/.git \
&& (git --version) >/dev/null 2>/dev/null \
&& (date --version) >/dev/null 2>/dev/null; then
# gnulib checked out from git.
sed_extract_first_date='/^Date/{
s/^Date:[ ]*//p
q
}'
date=`cd "$gnulib_dir" && git log -n 1 --format=medium --date=iso ChangeLog | sed -n -e "$sed_extract_first_date"`
# Use GNU date to compute the time in GMT.
date=`date -d "$date" -u +"%Y-%m-%d %H:%M:%S"`
version=' '`cd "$gnulib_dir" && ./build-aux/git-version-gen /dev/null | sed -e 's/-dirty/-modified/'`
else
# gnulib copy without versioning information.
date=`sed -e 's/ .*//;q' "$gnulib_dir"/ChangeLog`
version=
fi
year=`"$gnulib_dir"/build-aux/mdate-sh "$self_abspathname" | sed -e 's,^.* ,,'`
echo "\
gnulib-tool (GNU $package $date)$version
Copyright (C) $year Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <https://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
"
printf "Written by %s, %s, and %s.\n" "Bruno Haible" "Paul Eggert" "Simon Josefsson"
}
# func_emit_copyright_notice
# outputs to stdout a header for a generated file.
func_emit_copyright_notice ()
{
sed -n -e '/Copyright/ {
p
q
}' < "$self_abspathname"
echo "#"
echo "# This file is free software; you can redistribute it and/or modify"
echo "# it under the terms of the GNU General Public License as published by"
echo "# the Free Software Foundation, either version 3 of the License, or"
echo "# (at your option) any later version."
echo "#"
echo "# This file is distributed in the hope that it will be useful,"
echo "# but WITHOUT ANY WARRANTY; without even the implied warranty of"
echo "# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the"
echo "# GNU General Public License for more details."
echo "#"
echo "# You should have received a copy of the GNU General Public License"
echo "# along with this file. If not, see <https://www.gnu.org/licenses/>."
echo "#"
echo "# As a special exception to the GNU General Public License,"
echo "# this file may be distributed as part of a program that"
echo "# contains a configuration script generated by Autoconf, under"
echo "# the same distribution terms as the rest of that program."
echo "#"
echo "# Generated by gnulib-tool."
}
# func_exit STATUS
# exits with a given status.
# This function needs to be used, rather than 'exit', when a 'trap' handler is
# in effect that refers to $?.
func_exit ()
{
(exit $1); exit $1
}
# func_fatal_error message
# outputs to stderr a fatal error message, and terminates the program.
# Input:
# - progname name of this program
func_fatal_error ()
{
echo "$progname: *** $1" 1>&2
echo "$progname: *** Stop." 1>&2
func_exit 1
}
# func_warning message
# Outputs to stderr a warning message,
func_warning ()
{
echo "gnulib-tool: warning: $1" 1>&2
}
# func_readlink SYMLINK
# outputs the target of the given symlink.
if (type readlink) > /dev/null 2>&1; then
func_readlink ()
{
# Use the readlink program from GNU coreutils.
readlink "$1"
}
else
func_readlink ()
{
# Use two sed invocations. A single sed -n -e 's,^.* -> \(.*\)$,\1,p'
# would do the wrong thing if the link target contains " -> ".
LC_ALL=C ls -l "$1" | sed -e 's, -> ,#%%#,' | sed -n -e 's,^.*#%%#\(.*\)$,\1,p'
}
fi
# func_gnulib_dir
# locates the directory where the gnulib repository lives
# Input:
# - progname name of this program
# Sets variables
# - self_abspathname absolute pathname of gnulib-tool
# - gnulib_dir absolute pathname of gnulib repository
func_gnulib_dir ()
{
case "$progname" in
/* | ?:*) self_abspathname="$progname" ;;
*/*) self_abspathname=`pwd`/"$progname" ;;
*)
# Look in $PATH.
# Iterate through the elements of $PATH.
# We use IFS=: instead of
# for d in `echo ":$PATH:" | sed -e 's/:::*/:.:/g' | sed -e 's/:/ /g'`
# because the latter does not work when some PATH element contains spaces.
# We use a canonicalized $pathx instead of $PATH, because empty PATH
# elements are by definition equivalent to '.', however field splitting
# according to IFS=: loses empty fields in many shells:
# - /bin/sh on OSF/1 and Solaris loses all empty fields (at the
# beginning, at the end, and in the middle),
# - /bin/sh on IRIX and /bin/ksh on IRIX and OSF/1 lose empty fields
# at the beginning and at the end,
# - GNU bash, /bin/sh on AIX and HP-UX, and /bin/ksh on AIX, HP-UX,
# Solaris lose empty fields at the end.
# The 'case' statement is an optimization, to avoid evaluating the
# explicit canonicalization command when $PATH contains no empty fields.
self_abspathname=
if test "$PATH_SEPARATOR" = ";"; then
# On Windows, programs are searched in "." before $PATH.
pathx=".;$PATH"
else
# On Unix, we have to convert empty PATH elements to ".".
pathx="$PATH"
case :$PATH: in
*::*)
pathx=`echo ":$PATH:" | sed -e 's/:::*/:.:/g' -e 's/^://' -e 's/:\$//'`
;;
esac
fi
saved_IFS="$IFS"
IFS="$PATH_SEPARATOR"
for d in $pathx; do
IFS="$saved_IFS"
test -z "$d" && d=.
if test -x "$d/$progname" && test ! -d "$d/$progname"; then
self_abspathname="$d/$progname"
break
fi
done
IFS="$saved_IFS"
if test -z "$self_abspathname"; then
func_fatal_error "could not locate the gnulib-tool program - how did you invoke it?"
fi
;;
esac
while test -h "$self_abspathname"; do
# Resolve symbolic link.
linkval=`func_readlink "$self_abspathname"`
test -n "$linkval" || break
case "$linkval" in
/* | ?:* ) self_abspathname="$linkval" ;;
* ) self_abspathname=`echo "$self_abspathname" | sed -e 's,/[^/]*$,,'`/"$linkval" ;;
esac
done
gnulib_dir=`echo "$self_abspathname" | sed -e 's,/[^/]*$,,'`
}
# func_tmpdir
# creates a temporary directory.
# Input:
# - progname name of this program
# Sets variable
# - tmp pathname of freshly created temporary directory
func_tmpdir ()
{
# Use the environment variable TMPDIR, falling back to /tmp. This allows
# users to specify a different temporary directory, for example, if their
# /tmp is filled up or too small.
: "${TMPDIR=/tmp}"
{
# Use the mktemp program if available. If not available, hide the error
# message.
tmp=`(umask 077 && mktemp -d "$TMPDIR/glXXXXXX") 2>/dev/null` &&
test -n "$tmp" && test -d "$tmp"
} ||
{
# Use a simple mkdir command. It is guaranteed to fail if the directory
# already exists. $RANDOM is bash specific and expands to empty in shells
# other than bash, ksh and zsh. Its use does not increase security;
# rather, it minimizes the probability of failure in a very cluttered /tmp
# directory.
tmp=$TMPDIR/gl$$-$RANDOM
(umask 077 && mkdir "$tmp")
} ||
{
echo "$progname: cannot create a temporary directory in $TMPDIR" >&2
func_exit 1
}
}
# func_append var value
# appends the given value to the shell variable var.
if ( foo=bar; foo+=baz && test "$foo" = barbaz ) >/dev/null 2>&1; then
# Use bash's += operator. It reduces complexity of appending repeatedly to
# a single variable from O(n^2) to O(n).
func_append ()
{
eval "$1+=\"\$2\""
}
fast_func_append=true
else
func_append ()
{
eval "$1=\"\$$1\$2\""
}
fast_func_append=false
fi
# func_remove_prefix var prefix
# removes the given prefix from the value of the shell variable var.
# var should be the name of a shell variable.
# Its value should not contain a newline and not start or end with whitespace.
# prefix should not contain the characters "$`\{}[]^|.
if ( foo=bar; eval 'test "${foo#b}" = ar' ) >/dev/null 2>&1; then
func_remove_prefix ()
{
eval "$1=\${$1#\$2}"
}
fast_func_remove_prefix=true
else
func_remove_prefix ()
{
eval "value=\"\$$1\""
prefix="$2"
case "$prefix" in
*.*)
sed_escape_dots='s/\([.]\)/\\\1/g'
prefix=`echo "$prefix" | sed -e "$sed_escape_dots"`
;;
esac
value=`echo "$value" | sed -e "s|^${prefix}||"`
eval "$1=\"\$value\""
}
fast_func_remove_prefix=false
fi
# Determine whether we should use ':' or ';' as PATH_SEPARATOR.
func_determine_path_separator ()
{
if test "${PATH_SEPARATOR+set}" != set; then
# Determine PATH_SEPARATOR by trying to find /bin/sh in a PATH which
# contains only /bin. Note that ksh looks also at the FPATH variable,
# so we have to set that as well for the test.
PATH_SEPARATOR=:
(PATH='/bin;/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
&& { (PATH='/bin:/bin'; FPATH=$PATH; sh -c :) >/dev/null 2>&1 \
|| PATH_SEPARATOR=';'
}
fi
}
# func_path_append pathvar directory
# appends directory to pathvar, delimiting directories by PATH_SEPARATOR.
func_path_append ()
{
if eval "test -n \"\$$1\""; then
func_append "$1" "$PATH_SEPARATOR$2"
else
eval "$1=\$2"
fi
}
# func_path_foreach_inner
# helper for func_path_foreach because we need new 'args' array
# Input:
# - fpf_dir directory from local_gnulib_path
# - fpf_cb callback to be run for fpf_dir
func_path_foreach_inner ()
{
set %start% "$@"
for _fpf_arg
do
case "$_fpf_arg" in
%start%)
set dummy
;;
%dir%)
set "$@" "$fpf_dir"
;;
*)
set "$@" "$_fpf_arg"
;;
esac
done
shift
"$fpf_cb" "$@"
}
# func_path_foreach path method args
# Execute method for each directory in path. The method will be called
# like `method args` while any argument '%dir%' within args will be replaced
# with processed directory from path.
func_path_foreach ()
{
fpf_dirs="$1"; shift
fpf_cb="$1"; shift
fpf_rc=false
fpf_saved_IFS="$IFS"
IFS="$PATH_SEPARATOR"
for fpf_dir in $fpf_dirs
do
IFS="$fpf_saved_IFS"
func_path_foreach_inner "$@" && fpf_rc=:
done
IFS="$fpf_saved_IFS"
$fpf_rc
}
# func_remove_suffix var suffix
# removes the given suffix from the value of the shell variable var.
# var should be the name of a shell variable.
# Its value should not contain a newline and not start or end with whitespace.
# suffix should not contain the characters "$`\{}[]^|.
if ( foo=bar; eval 'test "${foo%r}" = ba' ) >/dev/null 2>&1; then
func_remove_suffix ()
{
eval "$1=\${$1%\$2}"
}
fast_func_remove_suffix=true
else
func_remove_suffix ()
{
eval "value=\"\$$1\""
suffix="$2"
case "$suffix" in
*.*)
sed_escape_dots='s/\([.]\)/\\\1/g'
suffix=`echo "$suffix" | sed -e "$sed_escape_dots"`
;;
esac
value=`echo "$value" | sed -e "s|${suffix}\$||"`
eval "$1=\"\$value\""
}
fast_func_remove_suffix=false
fi
# func_relativize DIR1 DIR2
# computes a relative pathname RELDIR such that DIR1/RELDIR = DIR2.
# Input:
# - DIR1 relative pathname, relative to the current directory
# - DIR2 relative pathname, relative to the current directory
# Output:
# - reldir relative pathname of DIR2, relative to DIR1
func_relativize ()
{
dir0=`pwd`
dir1="$1"
dir2="$2"
sed_first='s,^\([^/]*\)/.*$,\1,'
sed_rest='s,^[^/]*/*,,'
sed_last='s,^.*/\([^/]*\)$,\1,'
sed_butlast='s,/*[^/]*$,,'
while test -n "$dir1"; do
first=`echo "$dir1" | sed -e "$sed_first"`
if test "$first" != "."; then
if test "$first" = ".."; then
dir2=`echo "$dir0" | sed -e "$sed_last"`/"$dir2"
dir0=`echo "$dir0" | sed -e "$sed_butlast"`
else
first2=`echo "$dir2" | sed -e "$sed_first"`
if test "$first2" = "$first"; then
dir2=`echo "$dir2" | sed -e "$sed_rest"`
else
dir2="../$dir2"
fi
dir0="$dir0"/"$first"
fi
fi
dir1=`echo "$dir1" | sed -e "$sed_rest"`
done
reldir="$dir2"
}
# func_relconcat DIR1 DIR2
# computes a relative pathname DIR1/DIR2, with obvious simplifications.
# Input:
# - DIR1 relative pathname, relative to the current directory
# - DIR2 relative pathname, relative to DIR1
# Output:
# - relconcat DIR1/DIR2, relative to the current directory
func_relconcat ()
{
dir1="$1"
dir2="$2"
sed_first='s,^\([^/]*\)/.*$,\1,'
sed_rest='s,^[^/]*/*,,'
sed_last='s,^.*/\([^/]*\)$,\1,'
sed_butlast='s,/*[^/]*$,,'
while true; do
first=`echo "$dir2" | sed -e "$sed_first"`
if test "$first" = "."; then
dir2=`echo "$dir2" | sed -e "$sed_rest"`
if test -z "$dir2"; then
relconcat="$dir1"
break
fi
else
last=`echo "$dir1" | sed -e "$sed_last"`
while test "$last" = "."; do
dir1=`echo "$dir1" | sed -e "$sed_butlast"`
last=`echo "$dir1" | sed -e "$sed_last"`
done
if test -z "$dir1"; then
relconcat="$dir2"
break
fi
if test "$first" = ".."; then
if test "$last" = ".."; then
relconcat="$dir1/$dir2"
break
fi
dir1=`echo "$dir1" | sed -e "$sed_butlast"`
dir2=`echo "$dir2" | sed -e "$sed_rest"`
if test -z "$dir1"; then
relconcat="$dir2"
break
fi
if test -z "$dir2"; then
relconcat="$dir1"
break
fi
else
relconcat="$dir1/$dir2"
break
fi
fi
done
}
# func_ensure_writable DEST
# Ensures the file DEST is writable.
func_ensure_writable ()
{
test -w "$1" || chmod u+w "$1"
}
# func_ln_s SRC DEST
# Like ln -s, except use cp -p if ln -s fails.
func_ln_s ()
{
ln -s "$1" "$2" || {
echo "$progname: ln -s failed; falling back on cp -p" >&2
case "$1" in
/* | ?:*) # SRC is absolute.
cp_src="$1" ;;
*) # SRC is relative to the directory of DEST.
case "$2" in
*/*) cp_src="${2%/*}/$1" ;;
*) cp_src="$1" ;;
esac
;;
esac
cp -p "$cp_src" "$2"
func_ensure_writable "$2"
}
}
# func_symlink_target SRC DEST
# Determines LINK_TARGET such that "ln -s LINK_TARGET DEST" will create a
# symbolic link DEST that points to SRC.
# Output:
# - link_target link target, relative to the directory of DEST
func_symlink_target ()
{
case "$1" in
/* | ?:*)
link_target="$1" ;;
*) # SRC is relative.
case "$2" in
/* | ?:*)
link_target="`pwd`/$1" ;;
*) # DEST is relative too.
ln_destdir=`echo "$2" | sed -e 's,[^/]*$,,'`
test -n "$ln_destdir" || ln_destdir="."
func_relativize "$ln_destdir" "$1"
link_target="$reldir"
;;
esac
;;
esac
}
# func_symlink SRC DEST
# Like func_ln_s, except that SRC is given relative to the current directory (or
# absolute), not given relative to the directory of DEST.
func_symlink ()
{
func_symlink_target "$1" "$2"
func_ln_s "$link_target" "$2"
}
# func_symlink_if_changed SRC DEST
# Like func_symlink, but avoids munging timestamps if the link is correct.
# SRC is given relative to the current directory (or absolute).
func_symlink_if_changed ()
{
if test $# -ne 2; then
echo "usage: func_symlink_if_changed SRC DEST" >&2
fi
func_symlink_target "$1" "$2"
ln_target=`func_readlink "$2"`
if test -h "$2" && test "$link_target" = "$ln_target"; then
:
else
rm -f "$2"
func_ln_s "$link_target" "$2"
fi
}
# func_hardlink SRC DEST
# Like ln, except use cp -p if ln fails.
# SRC is given relative to the current directory (or absolute).
func_hardlink ()
{
ln "$1" "$2" || {
echo "$progname: ln failed; falling back on cp -p" >&2
cp -p "$1" "$2"
func_ensure_writable "$2"
}
}
# Ensure an 'echo' command that
# 1. does not interpret backslashes and
# 2. does not print an error message "broken pipe" when writing into a pipe
# with no writers.
#
# Test cases for problem 1:
# echo '\n' | wc -l prints 1 when OK, 2 when KO
# echo '\t' | grep t > /dev/null has return code 0 when OK, 1 when KO
# Test cases for problem 2:
# echo hi | true frequently prints
# "bash: echo: write error: Broken pipe"
# to standard error in bash 3.2.
#
# Problem 1 is a weird heritage from SVR4. BSD got it right (except that
# BSD echo interprets '-n' as an option, which is also not desirable).
# Nowadays the problem occurs in 4 situations:
# - in bash, when the shell option xpg_echo is set (bash >= 2.04)
# or when it was built with --enable-usg-echo-default (bash >= 2.0)
# or when it was built with DEFAULT_ECHO_TO_USG (bash < 2.0),
# - in zsh, when sh-emulation is not set,
# - in ksh (e.g. AIX /bin/sh and Solaris /usr/xpg4/bin/sh are ksh instances,
# and HP-UX /bin/sh and IRIX /bin/sh behave similarly),
# - in Solaris /bin/sh and OSF/1 /bin/sh.
# We try the following workarounds:
# - for all: respawn using $CONFIG_SHELL if that is set and works.
# - for bash >= 2.04: unset the shell option xpg_echo.
# - for bash >= 2.0: define echo to a function that uses the printf built-in.
# - for bash < 2.0: define echo to a function that uses cat of a here document.
# - for zsh: turn sh-emulation on.
# - for ksh: alias echo to 'print -r'.
# - for ksh: alias echo to a function that uses cat of a here document.
# - for Solaris /bin/sh and OSF/1 /bin/sh: respawn using /bin/ksh and rely on
# the ksh workaround.
# - otherwise: respawn using /bin/sh and rely on the workarounds.
# When respawning, we pass --no-reexec as first argument, so as to avoid
# turning this script into a fork bomb in unlucky situations.
#
# Problem 2 is specific to bash 3.2 and affects the 'echo' built-in, but not
# the 'printf' built-in. See
# <https://lists.gnu.org/r/bug-bash/2008-12/msg00050.html>
# <https://lists.gnu.org/r/bug-gnulib/2010-02/msg00154.html>
# The workaround is: define echo to a function that uses the printf built-in.
have_echo=
if echo '\t' | grep t > /dev/null; then
have_echo=yes # Lucky!
fi
# Try the workarounds.
# Respawn using $CONFIG_SHELL if that is set and works.
if test -z "$have_echo" \
&& test "X$1" != "X--no-reexec" \
&& test -n "$CONFIG_SHELL" \
&& test -f "$CONFIG_SHELL" \
&& $CONFIG_SHELL -c "echo '\\t' | grep t > /dev/null"; then
exec $CONFIG_SHELL "$0" --no-reexec "$@"
exit 127
fi
# For bash >= 2.04: unset the shell option xpg_echo.
if test -z "$have_echo" \
&& test -n "$BASH_VERSION" \
&& (shopt -o xpg_echo; echo '\t' | grep t > /dev/null) 2>/dev/null; then
shopt -o xpg_echo
have_echo=yes
fi
# For bash >= 2.0: define echo to a function that uses the printf built-in.
# For bash < 2.0: define echo to a function that uses cat of a here document.
# (There is no win in using 'printf' over 'cat' if it is not a shell built-in.)
# Also handle problem 2, specific to bash 3.2, here.
if { test -z "$have_echo" \
|| case "$BASH_VERSION" in 3.2*) true;; *) false;; esac; \
} \
&& test -n "$BASH_VERSION"; then \
if type printf 2>/dev/null | grep / > /dev/null; then
# 'printf' is not a shell built-in.
echo ()
{
cat <<EOF
$*
EOF
}
else
# 'printf' is a shell built-in.
echo ()
{
printf '%s\n' "$*"
}
fi
if echo '\t' | grep t > /dev/null; then
have_echo=yes
fi
fi
# For zsh: turn sh-emulation on.
if test -z "$have_echo" \
&& test -n "$ZSH_VERSION" \
&& (emulate sh) >/dev/null 2>&1; then
emulate sh
fi
# For ksh: alias echo to 'print -r'.
if test -z "$have_echo" \
&& (type print) >/dev/null 2>&1; then
# A 'print' command exists.
if type print 2>/dev/null | grep / > /dev/null; then
:
else
# 'print' is a shell built-in.
if (print -r '\told' | grep told > /dev/null) 2>/dev/null; then
# 'print' is the ksh shell built-in.
alias echo='print -r'
fi
fi