adjust ChangeLog generation to git

now that log generation is cheap, don't store it in the SCM any more.
(cherry picked from commit 474ce08b3a)

Makefile.am

@@ -2,11 +2,57 @@ SUBDIRS = src
 bin_SCRIPTS = get-cert
 EXTRA_DIST = debian isync.spec $(bin_SCRIPTS)
 
+LOG_PL = \
+    use POSIX qw(strftime); \
+    use Date::Parse; \
+    use Text::Wrap; \
+    $$Text::Wrap::columns = 72; \
+    while (defined($$_ = <>)) { \
+        /^commit / or die "commit missing: $$_"; \
+        <> =~ /^log size (\d+)$$/ or die "wrong size"; \
+        $$len = $$1; \
+        read(STDIN, $$log, $$len) == $$len or die "unexpected EOF"; \
+        $$log =~ s/^Author: ([^>]+>)\nDate:   (\d{4}-\d\d-\d\d \d\d:\d\d:\d\d [-+]\d{4})\n(.*)$$/$$3/s or die "unexpected log format"; \
+        $$author = $$1; $$date = str2time($$2); \
+        scalar(<>); \
+        @files = (); \
+        $$pfx = ""; \
+        while (defined($$l = <>) and $$l ne "\n") { \
+            chomp $$l; \
+            next if ($$l =~ m,^(ChangeLog$$|NEWS$$|TODO$$|debian/),); \
+            if (!@files) { \
+                $$pfx = $$l; \
+                $$pfx =~ s,/?[^/]+$$,,; \
+            } else { \
+                while (length($$pfx)) { \
+                    $$l =~ m,^\Q$$pfx/\E, and last; \
+                    $$pfx =~ s,/?[^/]+$$,,; \
+                } \
+            } \
+            push @files, $$l; \
+        } \
+        next if (!@files); \
+        print strftime("%F %H:%M", gmtime($$date))."  ".$$author."\n\n"; \
+        if (@files > 1 and ($$len = length($$pfx))) { \
+            @efiles = (); \
+            for $$f (@files) { push @efiles, substr($$f, $$len + 1); } \
+            $$fstr = $$pfx."/: "; \
+        } else { \
+            @efiles = @files; \
+            $$fstr = ""; \
+        } \
+        print wrap("\t* ", "\t  ", $$fstr.join(", ", @efiles).":")."\n"; \
+        $$log =~ s, +$$,,gm; \
+        $$log =~ s,^    ,\t,gm; \
+        print $$log."\n"; \
+    }
+
+$(srcdir)/ChangeLog: log
 log:
-	@perl -p -e "s/^(\\S+)\\s+(\\S.+\\S)\\s+(\\S+)\\s*\$$/\$$1:'\$$2 <\$$3>'\\n/" < ../CVSROOT/accounts > .usermap
-	@if test -f CVS/Tag; then tag=`cut -c2- CVS/Tag`; else tag=trunk; fi; \
-	 cvs2cl -U .usermap -F $$tag --no-wrap --separate-header -I ChangeLog -I NEWS -I TODO -I debian/
-	@rm -f .usermap ChangeLog.bak
+	@test -z "$(srcdir)" || cd $(srcdir) && \
+	 ( ! test -d .git || \
+	   git log --date=iso --log-size --name-only | \
+	     perl -e '$(LOG_PL)' > ChangeLog )
 
 deb:
 	CFLAGS="-O2 -mcpu=i686" fakeroot debian/rules binary

autogen.sh

@@ -1,5 +1,6 @@
 #! /bin/sh
 set -e -v
+make -f Makefile.am log
 aclocal
 autoheader
 automake --add-missing