git-svn: fix localtime=true on non-glibc environments

git svn uses POSIX::strftime('%s', $sec, $min, ...) to make unix epoch time.
But lowercase %s formatting character is a GNU extention. This causes problem
in git svn fetch --localtime on non-glibc systems, such as msys or cygwin.
Using Time::Local::timelocal($sec, $min, ...) fixes it.

Signed-off-by: Ryuichi Kokubo <ryu1kkb@gmail.com>
Signed-off-by: Eric Wong <normalperson@yhbt.net>
Notes:
lowercase %s format character in strftime is a GNU extension and not widely supported.
POSIX::strftime affected by underlying crt's strftime because POSIX::strftime just calls crt's one.
Time::Local is good function to replace POSIX::strftime because it's a perl core module function.

Document about Time::Local.
http://perldoc.perl.org/Time/Local.html

These are specifications of strftime.

The GNU C Library Reference Manual.
http://www.gnu.org/software/libc/manual/html_node/Formatting-Calendar-Time.html

perl POSIX module's strftime document. It does not have '%s'.
http://perldoc.perl.org/POSIX.html

strftime document of Microsort Windows C Run-Time library.
https://msdn.microsoft.com/en-us/library/fe06s4ak.aspx

The Open Group's old specification does not have '%s' too.
http://pubs.opengroup.org/onlinepubs/007908799/xsh/strftime.html

On my environment, following problems happened.
- msys   : git svn fetch does not progress at all with perl.exe consuming CPU.
- cygwin : git svn fetch progresses but time stamp information is dropped.
Every commits have unix epoch timestamp.

I would like to thank git developer and contibutors.
git helps me so much everyday.
Thank you.

Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/perl/Git/SVN.pm b/perl/Git/SVN.pm
index d9a52a52df338926cdc21ea925cebc2dd7c3a388..7006219c0a386f59030f6a08810abfeb211a0da2 100644 (file)
--- a/perl/Git/SVN.pm
+++ b/perl/Git/SVN.pm
@@ -14,6 +14,7 @@ package Git::SVN;
 use Memoize;  # core since 5.8.0, Jul 2002
 use Memoize::Storable;
 use POSIX qw(:signal_h);
+use Time::Local;
 
 use Git qw(
     command
@@ -1332,7 +1333,7 @@ sub parse_svn_date {
                $ENV{TZ} = 'UTC';
 
                my $epoch_in_UTC =
-                   POSIX::strftime('%s', $S, $M, $H, $d, $m - 1, $Y - 1900);
+                   Time::Local::timelocal($S, $M, $H, $d, $m - 1, $Y - 1900);
 
                # Determine our local timezone (including DST) at the
                # time of $epoch_in_UTC.  $Git::SVN::Log::TZ stored the