[Bug 1691636] Re: Incorrect timestamps on unzipped files.

Thu Jun 1 13:29:12 UTC 2023

Dominik, if you look at file #2, you'll see the timestamp is different
between the zip and the file on disk.  It changed from 22:22:35 to
22:22:36.  Zipinfo shows 22:22:35 as well.

$ ls --full-time  (before extraction)
-rw-r--r-- 1 root root 0 2017-05-17 22:22:35.196210798 -0500 2

$ ls --full-time (after extraction)
-rw-r--r-- 1 root root 0 2017-05-17 22:22:36.000000000 -0500 2

$ zipinfo -T test.zip
-rw-r--r-- 3.0 unx 0 bx stor 20170517.222235 2

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Title:
  Incorrect timestamps on unzipped files.

Status in unzip package in Ubuntu:
  Invalid

Bug description:
  Description of problem:

  Unzip will sometimes round up timestamps of unpacked files.  This
  results in a 1-second difference between the timestamp shown via
  zipinfo -T, and the unzipped file on disk

  Steps to Reproduce:
  1.  Zip files with different timestamps.
  2.  Note the timestamps stored in the archive with `zipinfo -T`
  3.  Unzip the archive
  4.  Compare the timestamps with `ls --full-time`
  5.  Note a difference of 1 second on some files.

  Actual results:
  Timestamps are off by a second on some files

  Expected results:
  Timestamps should match between zipinfo and ls.

  Example -- note the timestamps on file "2"

  $ touch 1
  $ zip test.zip 1
    adding: 1 (stored 0%)
  $ touch 2
  $ zip test.zip 2
    adding: 2 (stored 0%)
  $ touch 3
  $ zip test.zip 3
    adding: 3 (stored 0%)
  $ ls --full-time
  total 4
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:30.596313711 -0500 1
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:35.196210798 -0500 2
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:40.124112963 -0500 3
  -rw-r--r-- 1 root root 412 2017-05-17 22:22:43.224057225 -0500 test.zip
  $ rm -f 1 2 3
  $ unzip test.zip
  Archive:  test.zip
   extracting: 1
   extracting: 2
   extracting: 3
  $ ls --full-time
  total 4
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:30.000000000 -0500 1
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:36.000000000 -0500 2
  -rw-r--r-- 1 root root   0 2017-05-17 22:22:40.000000000 -0500 3
  -rw-r--r-- 1 root root 412 2017-05-17 22:22:43.224057225 -0500 test.zip
  $ zipinfo -T test.zip
  Archive:  test.zip
  Zip file size: 412 bytes, number of entries: 3
  -rw-r--r--  3.0 unx        0 bx stor 20170517.222230 1
  -rw-r--r--  3.0 unx        0 bx stor 20170517.222235 2
  -rw-r--r--  3.0 unx        0 bx stor 20170517.222240 3
  3 files, 0 bytes uncompressed, 0 bytes compressed:  0.0%

  $ lsb_release -rd
  Description:    Ubuntu 16.04.2 LTS
  Release:        16.04
  $ apt-cache policy zip unzip
  zip:
    Installed: 3.0-11
    Candidate: 3.0-11
    Version table:
   *** 3.0-11 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  unzip:
    Installed: 6.0-20ubuntu1
    Candidate: 6.0-20ubuntu1
    Version table:
   *** 6.0-20ubuntu1 500
          500 http://us.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status

  $ cat /etc/os-release
  NAME="Ubuntu"
  VERSION="16.04.2 LTS (Xenial Xerus)"
  ID=ubuntu
  ID_LIKE=debian
  PRETTY_NAME="Ubuntu 16.04.2 LTS"
  VERSION_ID="16.04"
  HOME_URL="http://www.ubuntu.com/"
  SUPPORT_URL="http://help.ubuntu.com/"
  BUG_REPORT_URL="http://bugs.launchpad.net/ubuntu/"
  VERSION_CODENAME=xenial
  UBUNTU_CODENAME=xenial

  $ dpkg -s zip unzip
  Package: zip
  Status: install ok installed
  Priority: optional
  Section: utils
  Installed-Size: 573
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Multi-Arch: foreign
  Version: 3.0-11
  Depends: libbz2-1.0, libc6 (>= 2.14)
  Recommends: unzip
  Description: Archiver for .zip files
   This is InfoZIP's zip program. It produces files that are fully
   compatible with the popular PKZIP program; however, the command line
   options are not identical. In other words, the end result is the same,
   but the methods differ. :-)
   .
   This version supports encryption.
  Original-Maintainer: Santiago Vila <sanvila at debian.org>
  Homepage: http://www.info-zip.org/Zip.html

  Package: unzip
  Status: install ok installed
  Priority: optional
  Section: utils
  Installed-Size: 518
  Maintainer: Ubuntu Developers <ubuntu-devel-discuss at lists.ubuntu.com>
  Architecture: amd64
  Multi-Arch: foreign
  Version: 6.0-20ubuntu1
  Depends: libbz2-1.0, libc6 (>= 2.14)
  Suggests: zip
  Description: De-archiver for .zip files
   InfoZIP's unzip program. With the exception of multi-volume archives
   (ie, .ZIP files that are split across several disks using PKZIP's /& option),
   this can handle any file produced either by PKZIP, or the corresponding
   InfoZIP zip program.
   .
   This version supports encryption.
  Homepage: http://www.info-zip.org/UnZip.html
  Original-Maintainer: Santiago Vila <sanvila at debian.org>

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: unzip 6.0-20ubuntu1
  ProcVersionSignature: Ubuntu 4.4.0-62.83-generic 4.4.40
  Uname: Linux 4.4.0-62-generic x86_64
  ApportVersion: 2.20.1-0ubuntu2.5
  Architecture: amd64
  Date: Wed May 17 22:40:25 2017
  Dependencies:
   gcc-6-base 6.0.1-0ubuntu1
   libbz2-1.0 1.0.6-8
   libc6 2.23-0ubuntu7
   libgcc1 1:6.0.1-0ubuntu1
  InstallationDate: Installed on 2017-05-18 (0 days ago)
  InstallationMedia: Ubuntu-Server 16.04.2 LTS "Xenial Xerus" - Release amd64 (20170215.8)
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: unzip
  UpgradeStatus: No upgrade log present (probably fresh install)

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