in reply to Re^9: Archive::Zip Modify Date Oddity
in thread Archive::Zip Modify Date Oddity

(++ for the sample). Interestingly, I see the other reported behaviour where the mtime is rounded down to even seconds:

$ echo foo > abc
$ stat abc | grep Mod
Modify: 2017-01-11 09:47:51.022907652 +0000
$ perl -M'IO::Compress::Zip qw(zip)' -e ' zip "abc" => "abc.zip" '
$ mkdir out
$ cd out
$ unzip ../abc.zip
Archive:  ../abc.zip
  inflating: abc                     
$ stat abc | grep Mod
Modify: 2017-01-11 09:47:50.000000000 +0000

[download]

Versions are:

And this from "unzip -v":

UnZip 6.00 of 20 April 2009, by Info-ZIP.  Maintained by C. Spieler.  
+Send
bug reports using http://www.info-zip.org/zip-bug.html; see README for
+ details.

Latest sources and executables are at ftp://ftp.info-zip.org/pub/infoz
+ip/ ;
see ftp://ftp.info-zip.org/pub/infozip/UnZip.html for other sites.

Compiled with gcc 5.0.0 20150210 (Red Hat 5.0.0-0.11) for Unix (Linux 
+ELF) on Feb 11 2015.

UnZip special compilation options:
        COPYRIGHT_CLEAN (PKZIP 0.9x unreducing method not supported)
        SET_DIR_ATTRIB
        SYMLINKS (symbolic links supported, if RTL and file system per
+mit)
        TIMESTAMP
        UNIXBACKUP
        USE_EF_UT_TIME
        USE_UNSHRINK (PKZIP/Zip 1.x unshrinking method supported)
        USE_DEFLATE64 (PKZIP 4.x Deflate64(tm) supported)
        UNICODE_SUPPORT [wide-chars, char coding: UTF-8] (handle UTF-8
+ paths)
        MBCS-support (multibyte character support, MB_CUR_MAX = 6)
        LARGE_FILE_SUPPORT (large files over 2 GiB supported)
        ZIP64_SUPPORT (archives using Zip64 for large files supported)
        USE_BZIP2 (PKZIP 4.6+, using bzip2 lib version 1.0.6, 6-Sept-2
+010)
        VMS_TEXT_CONV
        [decryption, version 2.11 of 05 Jan 2007]

UnZip and ZipInfo environment options:
           UNZIP:  [none]
        UNZIPOPT:  [none]
         ZIPINFO:  [none]
      ZIPINFOOPT:  [none]

[download]

I'm wondering if maybe it's something in the unzip. Is there a simple way to query the entries in the zipfile to see what its contents are to the resolution of seconds? (I never use zip/unzip so this is all beyond my realm)

Replies are listed 'Best First'.
Re^11: Archive::Zip Modify Date Oddity
by pmqs (Friar) on Jan 11, 2017 at 11:44 UTC

    I'm running exactly the same version of unzip & it works fine. To get more details on the zip file, try running 

    zipinfo -v abc.zip

    [download]

    See my first reply dated today for what you need to look for in the output.

    Also - IO:Compress comes with a script called zipdetails that dumps lots of details on the fip file. If you happen to have available that try running this. The thing to look for is the "Extended Timestamp" entry 

    $ zipdetails abc.zip 

0000 LOCAL HEADER #1       04034B50
0004 Extract Zip Spec      14 '2.0'
0005 Extract OS            00 'MS-DOS'
0006 General Purpose Flag  0008
     [Bits 1-2]            0 'Normal Compression'
     [Bit  3]              1 'Streamed'
0008 Compression Method    0008 'Deflated'
000A Last Mod Time         4A2B4C89 'Wed Jan 11 09:36:18 2017'
000E CRC                   00000000
0012 Compressed Length     00000000
0016 Uncompressed Length   00000000
001A Filename Length       0003
001C Extra Length          001C
001E Filename              'abc'
0021 Extra ID #0001        5455 'UT: Extended Timestamp'
0023   Length              0009
0025   Flags               '03 mod access'
0026   Mod Time            5875FC93 'Wed Jan 11 09:36:19 2017'
002A   Access Time         5875FCA7 'Wed Jan 11 09:36:39 2017'
002E Extra ID #0002        7875 'ux: Unix Extra Type 3'
0030   Length              000B
0032   Version             01
0033   UID Size            04
0034   UID                 0000245B
0038   GID Size            04
0039   GID                 00005208
003D PAYLOAD               KLJ...

0043 STREAMING DATA HEADER 08074B50
0047 CRC                   4788814E
004B Compressed Length     00000006
004F Uncompressed Length   00000004

0053 CENTRAL HEADER #1     02014B50
0057 Created Zip Spec      14 '2.0'
0058 Created OS            03 'Unix'
0059 Extract Zip Spec      14 '2.0'
005A Extract OS            00 'MS-DOS'
005B General Purpose Flag  0008
     [Bits 1-2]            0 'Normal Compression'
     [Bit  3]              1 'Streamed'
005D Compression Method    0008 'Deflated'
005F Last Mod Time         4A2B4C89 'Wed Jan 11 09:36:18 2017'
0063 CRC                   4788814E
0067 Compressed Length     00000006
006B Uncompressed Length   00000004
006F Filename Length       0003
0071 Extra Length          0018
0073 Comment Length        0000
0075 Disk Start            0000
0077 Int File Attributes   0001
     [Bit 0]               1 Text Data
0079 Ext File Attributes   81A40000
007D Local Header Offset   00000000
0081 Filename              'abc'
0084 Extra ID #0001        5455 'UT: Extended Timestamp'
0086   Length              0005
0088   Flags               '01 mod'
0089   Mod Time            5875FC93 'Wed Jan 11 09:36:19 2017'
008D Extra ID #0002        7875 'ux: Unix Extra Type 3'
008F   Length              000B
0091   Version             01
0092   UID Size            04
0093   UID                 0000245B
0097   GID Size            04
0098   GID                 00005208

009C END CENTRAL HEADER    06054B50
00A0 Number of this disk   0000
00A2 Central Dir Disk no   0000
00A4 Entries in this disk  0001
00A6 Total Entries         0001
00A8 Size of Central Dir   00000049
00AC Offset to Central Dir 00000053
00B0 Comment Length        0000
Done

    [download]
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      Very interesting. Here's what zipinfo tells me:

      $ zipinfo -v abc.zip 
Archive:  abc.zip
There is no zipfile comment.

End-of-central-directory record:
-------------------------------

  Zip archive file size:                       178 (00000000000000B2h)
  Actual end-cent-dir record offset:           156 (000000000000009Ch)
  Expected end-cent-dir record offset:         156 (000000000000009Ch)
  (based on the length of the central directory and its expected offse
+t)

  This zipfile constitutes the sole disk of a single-part archive; its
  central directory contains 1 entry.
  The central directory is 73 (0000000000000049h) bytes long,
  and its (expected) offset in bytes from the beginning of the zipfile
  is 83 (0000000000000053h).


Central directory entry #1:
---------------------------

  abc

  offset of local header from start of archive:   0
                                                  (0000000000000000h) 
+bytes
  file system or operating system of origin:      Unix
  version of encoding software:                   2.0
  minimum file system compatibility required:     MS-DOS, OS/2 or NT F
+AT
  minimum software version required to extract:   2.0
  compression method:                             deflated
  compression sub-type (deflation):               normal
  file security status:                           not encrypted
  extended local header:                          yes
  file last modified on (DOS date/time):          2017 Jan 11 09:47:50
  file last modified on (UT extra field modtime): 2017 Jan 11 09:47:51
+ local
  file last modified on (UT extra field modtime): 2017 Jan 11 09:47:51
+ UTC
  32-bit CRC value (hex):                         7e3265a8
  compressed size:                                6 bytes
  uncompressed size:                              4 bytes
  length of filename:                             3 characters
  length of extra field:                          24 bytes
  length of file comment:                         0 characters
  disk number on which file begins:               disk 1
  apparent file type:                             text
  Unix file attributes (100664 octal):            -rw-rw-r--
  MS-DOS file attributes (00 hex):                none

  The central-directory extra field contains:
  - A subfield with ID 0x5455 (universal time) and 5 data bytes.
    The local extra field has UTC/GMT modification time.
  - A subfield with ID 0x7875 (Unix UID/GID (any size)) and 11 data by
+tes:
    01 04 e8 03 00 00 04 e8 03 00 00.

  There is no file comment.

      [download]

      So the "UT extra field modtime" entries are there and show the 1 second difference. I wonder why unzip isn't respecting that.

      Here's what I see from zipdetails:

      $ zipdetails abc.zip 

0000 LOCAL HEADER #1       04034B50
0004 Extract Zip Spec      14 '2.0'
0005 Extract OS            00 'MS-DOS'
0006 General Purpose Flag  0008
     [Bits 1-2]            0 'Normal Compression'
     [Bit  3]              1 'Streamed'
0008 Compression Method    0008 'Deflated'
000A Last Mod Time         4A2B4DF9 'Wed Jan 11 09:47:50 2017'
000E CRC                   00000000
0012 Compressed Length     00000000
0016 Uncompressed Length   00000000
001A Filename Length       0003
001C Extra Length          001C
001E Filename              'abc'
0021 Extra ID #0001        5455 'UT: Extended Timestamp'
0023   Length              0009
0025   Flags               '03 mod access'
0026   Mod Time            5875FF47 'Wed Jan 11 09:47:51 2017'
002A   Access Time         5875FF47 'Wed Jan 11 09:47:51 2017'
002E Extra ID #0002        7875 'ux: Unix Extra Type 3'
0030   Length              000B
0032   Version             01
0033   UID Size            04
0034   UID                 000003E8
0038   GID Size            04
0039   GID                 000003E8
003D PAYLOAD               K.....

0043 STREAMING DATA HEADER 08074B50
0047 CRC                   7E3265A8
004B Compressed Length     00000006
004F Uncompressed Length   00000004

0053 CENTRAL HEADER #1     02014B50
0057 Created Zip Spec      14 '2.0'
0058 Created OS            03 'Unix'
0059 Extract Zip Spec      14 '2.0'
005A Extract OS            00 'MS-DOS'
005B General Purpose Flag  0008
     [Bits 1-2]            0 'Normal Compression'
     [Bit  3]              1 'Streamed'
005D Compression Method    0008 'Deflated'
005F Last Mod Time         4A2B4DF9 'Wed Jan 11 09:47:50 2017'
0063 CRC                   7E3265A8
0067 Compressed Length     00000006
006B Uncompressed Length   00000004
006F Filename Length       0003
0071 Extra Length          0018
0073 Comment Length        0000
0075 Disk Start            0000
0077 Int File Attributes   0001
     [Bit 0]               1 Text Data
0079 Ext File Attributes   81B40000
007D Local Header Offset   00000000
0081 Filename              'abc'
0084 Extra ID #0001        5455 'UT: Extended Timestamp'
0086   Length              0005
0088   Flags               '01 mod'
0089   Mod Time            5875FF47 'Wed Jan 11 09:47:51 2017'
008D Extra ID #0002        7875 'ux: Unix Extra Type 3'
008F   Length              000B
0091   Version             01
0092   UID Size            04
0093   UID                 000003E8
0097   GID Size            04
0098   GID                 000003E8

009C END CENTRAL HEADER    06054B50
00A0 Number of this disk   0000
00A2 Central Dir Disk no   0000
00A4 Entries in this disk  0001
00A6 Total Entries         0001
00A8 Size of Central Dir   00000049
00AC Offset to Central Dir 00000053
00B0 Comment Length        0000
Done

      [download]

      and again the correct times are present as the "Extended timestamp" entries. So inspection suggests that the zipfile is OK but unzip is ignoring the extended attributes.

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        Output from zipinfo & zipdetails looks fine. You seem to have an identical version of unzip, so I'm struggling to explain why we don't get exactly the same bahavior when we unzip abc.zip.

        Here are a couple of tests to try.

        Can you try creating the zip file like this and see if the mod time is correct when you unzip it.

        perl -M'IO::Compress::Zip qw(zip)' -e ' zip "abc" => "abc.zip", Stream
+ => 0 '

        [download]

        Also, try creating the zip file using the zip exe and see what the mod time looks like when unzipped. 

        zip abc.zip abc

        [download]
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Re^11: Archive::Zip Modify Date Oddity
by Anonymous Monk on Jan 13, 2017 at 20:08 UTC

    I think it's a bug in the unzip utility. Slackware has (prematurely?) enabled the -DIZ_HAVE_UXUIDGID option when compiling the package and this causes the breakage. The option does not show up on "unzip -v" either.

    In unzip60 sources, process.c:2909 

            flags &= ~0x0ff;      /* ignore any previous UNIX field */

    [download]
    That results in dos time fields being used instead of unix. I have no idea if there's a bugreport or a fix available somewhere.

    Just my 10 min debug. HtH.

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