gnulib: import gitlog-to-changelog

This is going to be used to generate ChangeLog files.

8 files changed, 569 insertions, 28 deletions

diff --git a/gnulib/ChangeLog b/gnulib/ChangeLog
index c16fc3f4e9a..810aa1e62da 100644
--- a/gnulib/ChangeLog
+++ b/gnulib/ChangeLog
@@ -1,3 +1,12 @@
+2021-03-24  Mike Frysinger  <vapier@gentoo.org>
+
+	* update-gnulib.sh (IMPORTED_GNULIB_MODULES): Add gitlog-to-changelog.
+	* Makefile.in, configure: Regenerate.
+	* import/Makefile.am, import/Makefile.in: Regenerate.
+	* import/m4/gnulib-cache.m4: Regenerate.
+	* import/m4/gnulib-comp.m4: Regenerate.
+	* import/extra/gitlog-to-changelog: New file.
+
 2021-02-05  Paul E. Murphy  <murphyp@linux.ibm.com>
 
 	* update-gnulib.sh (GNULIB_COMMIT_SHA1): Bump to
diff --git a/gnulib/configure b/gnulib/configure
index 63b2b1fc431..d6737ac4d3e 100644
--- a/gnulib/configure
+++ b/gnulib/configure
@@ -6726,6 +6726,7 @@ fi
   # Code from module getrandom:
   # Code from module gettext-h:
   # Code from module gettimeofday:
+  # Code from module gitlog-to-changelog:
   # Code from module glob:
   # Code from module glob-h:
   # Code from module hard-locale:
diff --git a/gnulib/import/Makefile.am b/gnulib/import/Makefile.am
index de8d7dec0ba..a79d6e1e537 100644
--- a/gnulib/import/Makefile.am
+++ b/gnulib/import/Makefile.am
@@ -43,6 +43,7 @@
 #  frexpl \
 #  getcwd \
 #  gettimeofday \
+#  gitlog-to-changelog \
 #  glob \
 #  inet_ntop \
 #  inttypes \
@@ -738,6 +739,13 @@ EXTRA_libgnu_a_SOURCES += gettimeofday.c
 
 ## end   gnulib module gettimeofday
 
+## begin gnulib module gitlog-to-changelog
+
+
+EXTRA_DIST += $(top_srcdir)/import/extra/gitlog-to-changelog
+
+## end   gnulib module gitlog-to-changelog
+
 ## begin gnulib module glob
 
 
diff --git a/gnulib/import/Makefile.in b/gnulib/import/Makefile.in
index 224a5176419..f703f362f73 100644
--- a/gnulib/import/Makefile.in
+++ b/gnulib/import/Makefile.in
@@ -57,6 +57,7 @@
 #  frexpl \
 #  getcwd \
 #  gettimeofday \
+#  gitlog-to-changelog \
 #  glob \
 #  inet_ntop \
 #  inttypes \
@@ -1781,34 +1782,36 @@ EXTRA_DIST = m4/gnulib-cache.m4 alloca.c alloca.in.h arpa_inet.in.h \
 	fnmatch.c fnmatch_loop.c fnmatch.c fnmatch.in.h fpucw.h free.c \
 	frexp.c frexp.c frexpl.c fstat.c stat-w32.c stat-w32.h \
 	at-func.c fstatat.c getcwd.c getcwd-lgpl.c getdtablesize.c \
-	getlogin_r.c getrandom.c gettimeofday.c glob.c glob_internal.h \
-	glob_pattern_p.c globfree.c glob-libc.h glob.in.h \
-	hard-locale.h inet_ntop.c intprops.h inttypes.in.h isblank.c \
-	float+.h isnan.c isnand-nolibm.h isnand.c float+.h isnan.c \
-	isnanl-nolibm.h isnanl.c cdefs.h libc-config.h limits.in.h \
-	localcharset.h locale.in.h lstat.c malloc.c malloca.h \
-	math.in.h lc-charset-dispatch.c lc-charset-dispatch.h \
-	mbrtowc-impl-utf8.h mbrtowc-impl.h mbrtowc.c mbtowc-lock.c \
-	mbtowc-lock.h windows-initguard.h mbsinit.c mbsrtowcs-impl.h \
-	mbsrtowcs-state.c mbsrtowcs.c mbtowc-impl.h mbtowc.c memchr.c \
-	memchr.valgrind memmem.c memmem.c str-two-way.h mempcpy.c \
-	memrchr.c mkdir.c mkdtemp.c mkostemp.c msvc-inval.c \
-	msvc-inval.h msvc-nothrow.c msvc-nothrow.h netinet_in.in.h \
-	open.c openat.c openat.h dirent-private.h opendir.c pathmax.h \
-	pipe.c rawmemchr.c rawmemchr.valgrind dirent-private.h \
-	readdir.c readlink.c realloc.c rename.c dirent-private.h \
-	rewinddir.c rmdir.c same-inode.h save-cwd.h \
-	malloc/scratch_buffer.h scratch_buffer.h setenv.c \
-	setlocale-lock.c setlocale_null.h windows-initguard.h \
-	signal.in.h _Noreturn.h arg-nonnull.h c++defs.h warn-on-use.h \
-	stat-w32.c stat-w32.h stat.c stat-time.h stdalign.in.h \
-	stdbool.in.h stddef.in.h stdint.in.h stdio.in.h stdlib.in.h \
-	strchrnul.c strchrnul.valgrind strdup.c streq.h strerror.c \
-	strerror-override.c strerror-override.h strerror_r.c \
-	string.in.h strnlen.c strstr.c str-two-way.h strstr.c \
-	strtok_r.c sys_random.in.h sys_socket.in.h sys_stat.in.h \
-	sys_time.in.h sys_types.in.h sys_uio.in.h tempname.h time.in.h \
-	time_r.c unistd.in.h unistd--.h unistd-safer.h unsetenv.c \
+	getlogin_r.c getrandom.c gettimeofday.c \
+	$(top_srcdir)/import/extra/gitlog-to-changelog glob.c \
+	glob_internal.h glob_pattern_p.c globfree.c glob-libc.h \
+	glob.in.h hard-locale.h inet_ntop.c intprops.h inttypes.in.h \
+	isblank.c float+.h isnan.c isnand-nolibm.h isnand.c float+.h \
+	isnan.c isnanl-nolibm.h isnanl.c cdefs.h libc-config.h \
+	limits.in.h localcharset.h locale.in.h lstat.c malloc.c \
+	malloca.h math.in.h lc-charset-dispatch.c \
+	lc-charset-dispatch.h mbrtowc-impl-utf8.h mbrtowc-impl.h \
+	mbrtowc.c mbtowc-lock.c mbtowc-lock.h windows-initguard.h \
+	mbsinit.c mbsrtowcs-impl.h mbsrtowcs-state.c mbsrtowcs.c \
+	mbtowc-impl.h mbtowc.c memchr.c memchr.valgrind memmem.c \
+	memmem.c str-two-way.h mempcpy.c memrchr.c mkdir.c mkdtemp.c \
+	mkostemp.c msvc-inval.c msvc-inval.h msvc-nothrow.c \
+	msvc-nothrow.h netinet_in.in.h open.c openat.c openat.h \
+	dirent-private.h opendir.c pathmax.h pipe.c rawmemchr.c \
+	rawmemchr.valgrind dirent-private.h readdir.c readlink.c \
+	realloc.c rename.c dirent-private.h rewinddir.c rmdir.c \
+	same-inode.h save-cwd.h malloc/scratch_buffer.h \
+	scratch_buffer.h setenv.c setlocale-lock.c setlocale_null.h \
+	windows-initguard.h signal.in.h _Noreturn.h arg-nonnull.h \
+	c++defs.h warn-on-use.h stat-w32.c stat-w32.h stat.c \
+	stat-time.h stdalign.in.h stdbool.in.h stddef.in.h stdint.in.h \
+	stdio.in.h stdlib.in.h strchrnul.c strchrnul.valgrind strdup.c \
+	streq.h strerror.c strerror-override.c strerror-override.h \
+	strerror_r.c string.in.h strnlen.c strstr.c str-two-way.h \
+	strstr.c strtok_r.c sys_random.in.h sys_socket.in.h \
+	sys_stat.in.h sys_time.in.h sys_types.in.h sys_uio.in.h \
+	tempname.h time.in.h time_r.c unistd.in.h unistd--.h \
+	unistd-safer.h unsetenv.c \
 	$(top_srcdir)/import/extra/update-copyright verify.h \
 	wchar.in.h wctype.in.h windows-initguard.h windows-mutex.c \
 	windows-mutex.h windows-once.c windows-once.h \
diff --git a/gnulib/import/extra/gitlog-to-changelog b/gnulib/import/extra/gitlog-to-changelog
new file mode 100755
index 00000000000..de76f658d48
--- /dev/null
+++ b/gnulib/import/extra/gitlog-to-changelog
@@ -0,0 +1,515 @@
+#!/bin/sh
+#! -*-perl-*-
+
+# Convert git log output to ChangeLog format.
+
+# Copyright (C) 2008-2021 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/>.
+#
+# Written by Jim Meyering
+
+# This is a prologue that allows to run a perl script as an executable
+# on systems that are compliant to a POSIX version before POSIX:2017.
+# On such systems, the usual invocation of an executable through execlp()
+# or execvp() fails with ENOEXEC if it is a script that does not start
+# with a #! line.  The script interpreter mentioned in the #! line has
+# to be /bin/sh, because on GuixSD systems that is the only program that
+# has a fixed file name.  The second line is essential for perl and is
+# also useful for editing this file in Emacs.  The next two lines below
+# are valid code in both sh and perl.  When executed by sh, they re-execute
+# the script through the perl program found in $PATH.  The '-x' option
+# is essential as well; without it, perl would re-execute the script
+# through /bin/sh.  When executed by perl, the next two lines are a no-op.
+eval 'exec perl -wSx "$0" "$@"'
+     if 0;
+
+my $VERSION = '2020-04-04 15:07'; # UTC
+# The definition above must lie within the first 8 lines in order
+# for the Emacs time-stamp write hook (at end) to update it.
+# If you change this file with Emacs, please let the write hook
+# do its job.  Otherwise, update this string manually.
+
+use strict;
+use warnings;
+use Getopt::Long;
+use POSIX qw(strftime);
+
+(my $ME = $0) =~ s|.*/||;
+
+# use File::Coda; # https://meyering.net/code/Coda/
+END {
+  defined fileno STDOUT or return;
+  close STDOUT and return;
+  warn "$ME: failed to close standard output: $!\n";
+  $? ||= 1;
+}
+
+sub usage ($)
+{
+  my ($exit_code) = @_;
+  my $STREAM = ($exit_code == 0 ? *STDOUT : *STDERR);
+  if ($exit_code != 0)
+    {
+      print $STREAM "Try '$ME --help' for more information.\n";
+    }
+  else
+    {
+      print $STREAM <<EOF;
+Usage: $ME [OPTIONS] [ARGS]
+
+Convert git log output to ChangeLog format.  If present, any ARGS
+are passed to "git log".  To avoid ARGS being parsed as options to
+$ME, they may be preceded by '--'.
+
+OPTIONS:
+
+   --amend=FILE FILE maps from an SHA1 to perl code (i.e., s/old/new/) that
+                  makes a change to SHA1's commit log text or metadata.
+   --append-dot append a dot to the first line of each commit message if
+                  there is no other punctuation or blank at the end.
+   --no-cluster never cluster commit messages under the same date/author
+                  header; the default is to cluster adjacent commit messages
+                  if their headers are the same and neither commit message
+                  contains multiple paragraphs.
+   --srcdir=DIR the root of the source tree, from which the .git/
+                  directory can be derived.
+   --since=DATE convert only the logs since DATE;
+                  the default is to convert all log entries.
+   --until=DATE convert only the logs older than DATE.
+   --ignore-matching=PAT ignore commit messages whose first lines match PAT.
+   --ignore-line=PAT ignore lines of commit messages that match PAT.
+   --format=FMT set format string for commit subject and body;
+                  see 'man git-log' for the list of format metacharacters;
+                  the default is '%s%n%b%n'
+   --strip-tab  remove one additional leading TAB from commit message lines.
+   --strip-cherry-pick  remove data inserted by "git cherry-pick";
+                  this includes the "cherry picked from commit ..." line,
+                  and the possible final "Conflicts:" paragraph.
+   --help       display this help and exit
+   --version    output version information and exit
+
+EXAMPLE:
+
+  $ME --since=2008-01-01 > ChangeLog
+  $ME -- -n 5 foo > last-5-commits-to-branch-foo
+
+SPECIAL SYNTAX:
+
+The following types of strings are interpreted specially when they appear
+at the beginning of a log message line.  They are not copied to the output.
+
+  Copyright-paperwork-exempt: Yes
+    Append the "(tiny change)" notation to the usual "date name email"
+    ChangeLog header to mark a change that does not require a copyright
+    assignment.
+  Co-authored-by: Joe User <user\@example.com>
+    List the specified name and email address on a second
+    ChangeLog header, denoting a co-author.
+  Signed-off-by: Joe User <user\@example.com>
+    These lines are simply elided.
+
+In a FILE specified via --amend, comment lines (starting with "#") are ignored.
+FILE must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1 (alone on
+a line) referring to a commit in the current project, and CODE refers to one
+or more consecutive lines of Perl code.  Pairs must be separated by one or
+more blank line.
+
+Here is sample input for use with --amend=FILE, from coreutils:
+
+3a169f4c5d9159283548178668d2fae6fced3030
+# fix typo in title:
+s/all tile types/all file types/
+
+1379ed974f1fa39b12e2ffab18b3f7a607082202
+# Due to a bug in vc-dwim, I mis-attributed a patch by Paul to myself.
+# Change the author to be Paul.  Note the escaped "@":
+s,Jim .*>,Paul Eggert <eggert\\\@cs.ucla.edu>,
+
+EOF
+    }
+  exit $exit_code;
+}
+
+# If the string $S is a well-behaved file name, simply return it.
+# If it contains white space, quotes, etc., quote it, and return the new string.
+sub shell_quote($)
+{
+  my ($s) = @_;
+  if ($s =~ m![^\w+/.,-]!)
+    {
+      # Convert each single quote to '\''
+      $s =~ s/\'/\'\\\'\'/g;
+      # Then single quote the string.
+      $s = "'$s'";
+    }
+  return $s;
+}
+
+sub quoted_cmd(@)
+{
+  return join (' ', map {shell_quote $_} @_);
+}
+
+# Parse file F.
+# Comment lines (starting with "#") are ignored.
+# F must consist of <SHA,CODE+> pairs where SHA is a 40-byte SHA1
+# (alone on a line) referring to a commit in the current project, and
+# CODE refers to one or more consecutive lines of Perl code.
+# Pairs must be separated by one or more blank line.
+sub parse_amend_file($)
+{
+  my ($f) = @_;
+
+  open F, '<', $f
+    or die "$ME: $f: failed to open for reading: $!\n";
+
+  my $fail;
+  my $h = {};
+  my $in_code = 0;
+  my $sha;
+  while (defined (my $line = <F>))
+    {
+      $line =~ /^\#/
+        and next;
+      chomp $line;
+      $line eq ''
+        and $in_code = 0, next;
+
+      if (!$in_code)
+        {
+          $line =~ /^([[:xdigit:]]{40})$/
+            or (warn "$ME: $f:$.: invalid line; expected an SHA1\n"),
+              $fail = 1, next;
+          $sha = lc $1;
+          $in_code = 1;
+          exists $h->{$sha}
+            and (warn "$ME: $f:$.: duplicate SHA1\n"),
+              $fail = 1, next;
+        }
+      else
+        {
+          $h->{$sha} ||= '';
+          $h->{$sha} .= "$line\n";
+        }
+    }
+  close F;
+
+  $fail
+    and exit 1;
+
+  return $h;
+}
+
+# git_dir_option $SRCDIR
+#
+# From $SRCDIR, the --git-dir option to pass to git (none if $SRCDIR
+# is undef).  Return as a list (0 or 1 element).
+sub git_dir_option($)
+{
+  my ($srcdir) = @_;
+  my @res = ();
+  if (defined $srcdir)
+    {
+      my $qdir = shell_quote $srcdir;
+      my $cmd = "cd $qdir && git rev-parse --show-toplevel";
+      my $qcmd = shell_quote $cmd;
+      my $git_dir = qx($cmd);
+      defined $git_dir
+        or die "$ME: cannot run $qcmd: $!\n";
+      $? == 0
+        or die "$ME: $qcmd had unexpected exit code or signal ($?)\n";
+      chomp $git_dir;
+      push @res, "--git-dir=$git_dir/.git";
+    }
+  @res;
+}
+
+{
+  my $since_date;
+  my $until_date;
+  my $format_string = '%s%n%b%n';
+  my $amend_file;
+  my $append_dot = 0;
+  my $cluster = 1;
+  my $ignore_matching;
+  my $ignore_line;
+  my $strip_tab = 0;
+  my $strip_cherry_pick = 0;
+  my $srcdir;
+  GetOptions
+    (
+     help => sub { usage 0 },
+     version => sub { print "$ME version $VERSION\n"; exit },
+     'since=s' => \$since_date,
+     'until=s' => \$until_date,
+     'format=s' => \$format_string,
+     'amend=s' => \$amend_file,
+     'append-dot' => \$append_dot,
+     'cluster!' => \$cluster,
+     'ignore-matching=s' => \$ignore_matching,
+     'ignore-line=s' => \$ignore_line,
+     'strip-tab' => \$strip_tab,
+     'strip-cherry-pick' => \$strip_cherry_pick,
+     'srcdir=s' => \$srcdir,
+    ) or usage 1;
+
+  defined $since_date
+    and unshift @ARGV, "--since=$since_date";
+  defined $until_date
+    and unshift @ARGV, "--until=$until_date";
+
+  # This is a hash that maps an SHA1 to perl code (i.e., s/old/new/)
+  # that makes a correction in the log or attribution of that commit.
+  my $amend_code = defined $amend_file ? parse_amend_file $amend_file : {};
+
+  my @cmd = ('git',
+             git_dir_option $srcdir,
+             qw(log --log-size),
+             '--pretty=format:%H:%ct  %an  <%ae>%n%n'.$format_string, @ARGV);
+  open PIPE, '-|', @cmd
+    or die ("$ME: failed to run '". quoted_cmd (@cmd) ."': $!\n"
+            . "(Is your Git too old?  Version 1.5.1 or later is required.)\n");
+
+  my $prev_multi_paragraph;
+  my $prev_date_line = '';
+  my @prev_coauthors = ();
+  my @skipshas = ();
+  while (1)
+    {
+      defined (my $in = <PIPE>)
+        or last;
+      $in =~ /^log size (\d+)$/
+        or die "$ME:$.: Invalid line (expected log size):\n$in";
+      my $log_nbytes = $1;
+
+      my $log;
+      my $n_read = read PIPE, $log, $log_nbytes;
+      $n_read == $log_nbytes
+        or die "$ME:$.: unexpected EOF\n";
+
+      # Extract leading hash.
+      my ($sha, $rest) = split ':', $log, 2;
+      defined $sha
+        or die "$ME:$.: malformed log entry\n";
+      $sha =~ /^[[:xdigit:]]{40}$/
+        or die "$ME:$.: invalid SHA1: $sha\n";
+
+      my $skipflag = 0;
+      if (@skipshas)
+        {
+          foreach(@skipshas)
+            {
+              if ($sha =~ /^$_/)
+                {
+                  $skipflag = $_;
+                  last;
+                }
+            }
+        }
+
+      # If this commit's log requires any transformation, do it now.
+      my $code = $amend_code->{$sha};
+      if (defined $code)
+        {
+          eval 'use Safe';
+          my $s = new Safe;
+          # Put the unpreprocessed entry into "$_".
+          $_ = $rest;
+
+          # Let $code operate on it, safely.
+          my $r = $s->reval("$code")
+            or die "$ME:$.:$sha: failed to eval \"$code\":\n$@\n";
+
+          # Note that we've used this entry.
+          delete $amend_code->{$sha};
+
+          # Update $rest upon success.
+          $rest = $_;
+        }
+
+      # Remove lines inserted by "git cherry-pick".
+      if ($strip_cherry_pick)
+        {
+          $rest =~ s/^\s*Conflicts:\n.*//sm;
+          $rest =~ s/^\s*\(cherry picked from commit [\da-f]+\)\n//m;
+        }
+
+      my @line = split /[ \t]*\n/, $rest;
+      my $author_line = shift @line;
+      defined $author_line
+        or die "$ME:$.: unexpected EOF\n";
+      $author_line =~ /^(\d+)  (.*>)$/
+        or die "$ME:$.: Invalid line "
+          . "(expected date/author/email):\n$author_line\n";
+
+      # Format 'Copyright-paperwork-exempt: Yes' as a standard ChangeLog
+      # `(tiny change)' annotation.
+      my $tiny = (grep (/^(?:Copyright-paperwork-exempt|Tiny-change):\s+[Yy]es$/, @line)
+                  ? '  (tiny change)' : '');
+
+      my $date_line = sprintf "%s  %s$tiny\n",
+        strftime ("%Y-%m-%d", localtime ($1)), $2;
+
+      my @coauthors = grep /^Co-authored-by:.*$/, @line;
+      # Omit meta-data lines we've already interpreted.
+      @line = grep !/^(?:Signed-off-by:[ ].*>$
+                       |Co-authored-by:[ ]
+                       |Copyright-paperwork-exempt:[ ]
+                       |Tiny-change:[ ]
+                       )/x, @line;
+
+      # Remove leading and trailing blank lines.
+      if (@line)
+        {
+          while ($line[0] =~ /^\s*$/) { shift @line; }
+          while ($line[$#line] =~ /^\s*$/) { pop @line; }
+        }
+
+      # Handle Emacs gitmerge.el "skipped" commits.
+      # Yes, this should be controlled by an option.  So sue me.
+      if ( grep /^(; )?Merge from /, @line )
+      {
+          my $found = 0;
+          foreach (@line)
+          {
+              if (grep /^The following commit.*skipped:$/, $_)
+              {
+                  $found = 1;
+                  ## Reset at each merge to reduce chance of false matches.
+                  @skipshas = ();
+                  next;
+              }
+              if ($found && $_ =~ /^([[:xdigit:]]{7,}) [^ ]/)
+              {
+                  push ( @skipshas, $1 );
+              }
+          }
+      }
+
+      # Ignore commits that match the --ignore-matching pattern, if specified.
+      if (defined $ignore_matching && @line && $line[0] =~ /$ignore_matching/)
+        {
+          $skipflag = 1;
+        }
+      elsif ($skipflag)
+        {
+          ## Perhaps only warn if a pattern matches more than once?
+          warn "$ME: warning: skipping $sha due to $skipflag\n";
+        }
+
+      if (! $skipflag)
+        {
+          if (defined $ignore_line && @line)
+            {
+              @line = grep ! /$ignore_line/, @line;
+              while ($line[$#line] =~ /^\s*$/) { pop @line; }
+            }
+
+          # Record whether there are two or more paragraphs.
+          my $multi_paragraph = grep /^\s*$/, @line;
+
+          # Format 'Co-authored-by: A U Thor <email@example.com>' lines in
+          # standard multi-author ChangeLog format.
+          for (@coauthors)
+            {
+              s/^Co-authored-by:\s*/\t    /;
+              s/\s*</  </;
+
+              /<.*?@.*\..*>/
+                or warn "$ME: warning: missing email address for "
+                  . substr ($_, 5) . "\n";
+            }
+
+          # If clustering of commit messages has been disabled, if this header
+          # would be different from the previous date/name/etc. header,
+          # or if this or the previous entry consists of two or more paragraphs,
+          # then print the header.
+          if ( ! $cluster
+              || $date_line ne $prev_date_line
+              || "@coauthors" ne "@prev_coauthors"
+              || $multi_paragraph
+              || $prev_multi_paragraph)
+            {
+              $prev_date_line eq ''
+                or print "\n";
+              print $date_line;
+              @coauthors
+                and print join ("\n", @coauthors), "\n";
+            }
+          $prev_date_line = $date_line;
+          @prev_coauthors = @coauthors;
+          $prev_multi_paragraph = $multi_paragraph;
+
+          # If there were any lines
+          if (@line == 0)
+            {
+              warn "$ME: warning: empty commit message:\n  $date_line\n";
+            }
+          else
+            {
+              if ($append_dot)
+                {
+                  # If the first line of the message has enough room, then
+                  if (length $line[0] < 72)
+                    {
+                      # append a dot if there is no other punctuation or blank
+                      # at the end.
+                      $line[0] =~ /[[:punct:]\s]$/
+                        or $line[0] .= '.';
+                    }
+                }
+
+              # Remove one additional leading TAB from each line.
+              $strip_tab
+                and map { s/^\t// } @line;
+
+              # Prefix each non-empty line with a TAB.
+              @line = map { length $_ ? "\t$_" : '' } @line;
+
+              print "\n", join ("\n", @line), "\n";
+            }
+        }
+
+      defined ($in = <PIPE>)
+        or last;
+      $in ne "\n"
+        and die "$ME:$.: unexpected line:\n$in";
+    }
+
+  close PIPE
+    or die "$ME: error closing pipe from " . quoted_cmd (@cmd) . "\n";
+  # FIXME-someday: include $PROCESS_STATUS in the diagnostic
+
+  # Complain about any unused entry in the --amend=F specified file.
+  my $fail = 0;
+  foreach my $sha (keys %$amend_code)
+    {
+      warn "$ME:$amend_file: unused entry: $sha\n";
+      $fail = 1;
+    }
+
+  exit $fail;
+}
+
+# Local Variables:
+# mode: perl
+# indent-tabs-mode: nil
+# eval: (add-hook 'before-save-hook 'time-stamp)
+# time-stamp-line-limit: 50
+# time-stamp-start: "my $VERSION = '"
+# time-stamp-format: "%:y-%02m-%02d %02H:%02M"
+# time-stamp-time-zone: "UTC0"
+# time-stamp-end: "'; # UTC"
+# End:
diff --git a/gnulib/import/m4/gnulib-cache.m4 b/gnulib/import/m4/gnulib-cache.m4
index 40873824b2b..00dcf604059 100644
--- a/gnulib/import/m4/gnulib-cache.m4
+++ b/gnulib/import/m4/gnulib-cache.m4
@@ -48,6 +48,7 @@
 #  frexpl \
 #  getcwd \
 #  gettimeofday \
+#  gitlog-to-changelog \
 #  glob \
 #  inet_ntop \
 #  inttypes \
@@ -89,6 +90,7 @@ gl_MODULES([
   frexpl
   getcwd
   gettimeofday
+  gitlog-to-changelog
   glob
   inet_ntop
   inttypes
diff --git a/gnulib/import/m4/gnulib-comp.m4 b/gnulib/import/m4/gnulib-comp.m4
index 682bfc86e78..c3926e0d06d 100644
--- a/gnulib/import/m4/gnulib-comp.m4
+++ b/gnulib/import/m4/gnulib-comp.m4
@@ -107,6 +107,7 @@ AC_DEFUN([gl_EARLY],
   # Code from module getrandom:
   # Code from module gettext-h:
   # Code from module gettimeofday:
+  # Code from module gitlog-to-changelog:
   # Code from module glob:
   # Code from module glob-h:
   # Code from module hard-locale:
@@ -923,6 +924,7 @@ AC_DEFUN([gltests_LIBSOURCES], [
 # This macro records the list of files which have been installed by
 # gnulib-tool and may be removed by future gnulib-tool invocations.
 AC_DEFUN([gl_FILE_LIST], [
+  build-aux/gitlog-to-changelog
   build-aux/update-copyright
   lib/_Noreturn.h
   lib/alloca.c
diff --git a/gnulib/update-gnulib.sh b/gnulib/update-gnulib.sh
index 02d045b5348..c734829126f 100755
--- a/gnulib/update-gnulib.sh
+++ b/gnulib/update-gnulib.sh
@@ -40,6 +40,7 @@ IMPORTED_GNULIB_MODULES="\
     frexpl \
     getcwd \
     gettimeofday \
+    gitlog-to-changelog \
     glob \
     inet_ntop
     inttypes \