Diff of the two buildlogs:

--
--- b1/build.log	2025-04-10 08:26:08.072811324 +0000
+++ b2/build.log	2025-04-10 08:26:50.355886738 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr  9 20:20:03 -12 2025
-I: pbuilder-time-stamp: 1744273203
+I: Current time: Thu May 14 04:49:09 +14 2026
+I: pbuilder-time-stamp: 1778683749
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking python-securetar_2025.2.1-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/3439889/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos15-amd64.
+I: Changing host+domainname to test build reproducibility
+I: Adding a custom variable just for the fun of it...
+I: Changing /bin/sh to bash
+'/bin/sh' -> '/bin/bash'
+lrwxrwxrwx 1 root root 9 May 13 14:49 /bin/sh -> /bin/bash
+I: Setting pbuilder2's login shell to /bin/bash
+I: Setting pbuilder2's GECOS to second user,second room,second work-phone,second home-phone,second other
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/D02_print_environment starting
 I: set
-  BUILDDIR='/build/reproducible-path'
-  BUILDUSERGECOS='first user,first room,first work-phone,first home-phone,first other'
-  BUILDUSERNAME='pbuilder1'
-  BUILD_ARCH='amd64'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=20 '
-  DISTRIBUTION='unstable'
-  HOME='/root'
-  HOST_ARCH='amd64'
+  BASH=/bin/sh
+  BASHOPTS=checkwinsize:cmdhist:complete_fullquote:extquote:force_fignore:globasciiranges:globskipdots:hostcomplete:interactive_comments:patsub_replacement:progcomp:promptvars:sourcepath
+  BASH_ALIASES=()
+  BASH_ARGC=()
+  BASH_ARGV=()
+  BASH_CMDS=()
+  BASH_LINENO=([0]="12" [1]="0")
+  BASH_LOADABLES_PATH=/usr/local/lib/bash:/usr/lib/bash:/opt/local/lib/bash:/usr/pkg/lib/bash:/opt/pkg/lib/bash:.
+  BASH_SOURCE=([0]="/tmp/hooks/D02_print_environment" [1]="/tmp/hooks/D02_print_environment")
+  BASH_VERSINFO=([0]="5" [1]="2" [2]="37" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.37(1)-release'
+  BUILDDIR=/build/reproducible-path
+  BUILDUSERGECOS='second user,second room,second work-phone,second home-phone,second other'
+  BUILDUSERNAME=pbuilder2
+  BUILD_ARCH=amd64
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=42 '
+  DIRSTACK=()
+  DISTRIBUTION=unstable
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='1813a9cd2373422c9cb8a4395213b937'
-  LANG='C'
-  LANGUAGE='en_US:en'
-  LC_ALL='C'
-  MAIL='/var/mail/root'
-  OPTIND='1'
-  PATH='/usr/sbin:/usr/bin:/sbin:/bin:/usr/games'
-  PBCURRENTCOMMANDLINEOPERATION='build'
-  PBUILDER_OPERATION='build'
-  PBUILDER_PKGDATADIR='/usr/share/pbuilder'
-  PBUILDER_PKGLIBDIR='/usr/lib/pbuilder'
-  PBUILDER_SYSCONFDIR='/etc'
-  PPID='3439889'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=f75d508224a64599aff52da06d7f41ce
+  LANG=C
+  LANGUAGE=et_EE:et
+  LC_ALL=C
+  MACHTYPE=x86_64-pc-linux-gnu
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnu
+  PATH=/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path
+  PBCURRENTCOMMANDLINEOPERATION=build
+  PBUILDER_OPERATION=build
+  PBUILDER_PKGDATADIR=/usr/share/pbuilder
+  PBUILDER_PKGLIBDIR=/usr/lib/pbuilder
+  PBUILDER_SYSCONFDIR=/etc
+  PIPESTATUS=([0]="0")
+  POSIXLY_CORRECT=y
+  PPID=1217198
   PS4='+ '
-  PWD='/'
-  SHELL='/bin/bash'
-  SHLVL='2'
-  SUDO_COMMAND='/usr/bin/timeout -k 18.1h 18h /usr/bin/ionice -c 3 /usr/bin/nice /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.6dqkD2cH/pbuilderrc_mbTv --distribution unstable --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.6dqkD2cH/b1 --logfile b1/build.log python-securetar_2025.2.1-2.dsc'
-  SUDO_GID='111'
-  SUDO_UID='106'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://46.16.76.132:3128'
+  PWD=/
+  SHELL=/bin/bash
+  SHELLOPTS=braceexpand:errexit:hashall:interactive-comments:posix
+  SHLVL=3
+  SUDO_COMMAND='/usr/bin/timeout -k 24.1h 24h /usr/bin/ionice -c 3 /usr/bin/nice -n 11 /usr/bin/unshare --uts -- /usr/sbin/pbuilder --build --configfile /srv/reproducible-results/rbuild-debian/r-b-build.6dqkD2cH/pbuilderrc_zf1D --distribution unstable --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/unstable-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.6dqkD2cH/b2 --logfile b2/build.log python-securetar_2025.2.1-2.dsc'
+  SUDO_GID=111
+  SUDO_UID=106
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://213.165.73.152:3128
 I: uname -a
-  Linux ionos11-amd64 6.1.0-32-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.129-1 (2025-03-06) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.12+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.12-1~bpo12+1 (2025-02-23) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Mar  4 11:20 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/3439889/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Mar  4  2025 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -184,7 +216,7 @@
 Get: 67 http://deb.debian.org/debian unstable/main amd64 python3-jaraco.context all 6.0.1-1 [8276 B]
 Get: 68 http://deb.debian.org/debian unstable/main amd64 python3-pluggy all 1.5.0-1 [26.9 kB]
 Get: 69 http://deb.debian.org/debian unstable/main amd64 python3-pytest all 8.3.5-2 [250 kB]
-Fetched 20.8 MB in 4s (4723 kB/s)
+Fetched 20.8 MB in 0s (122 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libpython3.13-minimal:amd64.
 (Reading database ... 
(Reading database ... 5%
(Reading database ... 10%
(Reading database ... 15%
(Reading database ... 20%
(Reading database ... 25%
(Reading database ... 30%
(Reading database ... 35%
(Reading database ... 40%
(Reading database ... 45%
(Reading database ... 50%
(Reading database ... 55%
(Reading database ... 60%
(Reading database ... 65%
(Reading database ... 70%
(Reading database ... 75%
(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19840 files and directories currently installed.)
@@ -418,8 +450,8 @@
 Setting up tzdata (2025b-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Thu Apr 10 08:23:06 UTC 2025.
-Universal Time is now:  Thu Apr 10 08:23:06 UTC 2025.
+Local time is now:      Wed May 13 14:49:35 UTC 2026.
+Universal Time is now:  Wed May 13 14:49:35 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20240727.1) ...
@@ -487,7 +519,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/python-securetar-2025.2.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-genchanges -S  > ../python-securetar_2025.2.1-2_source.changes
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/python-securetar-2025.2.1/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-genchanges -S  > ../python-securetar_2025.2.1-2_source.changes
 dpkg-buildpackage: info: source package python-securetar
 dpkg-buildpackage: info: source version 2025.2.1-2
 dpkg-buildpackage: info: source distribution unstable
@@ -535,7 +571,7 @@
 Copying securetar.egg-info to build/bdist.linux-x86_64/wheel/./securetar-2025.2.1.egg-info
 running install_scripts
 creating build/bdist.linux-x86_64/wheel/securetar-2025.2.1.dist-info/WHEEL
-creating '/build/reproducible-path/python-securetar-2025.2.1/.pybuild/cpython3_3.13/.tmp-3vurxbdc/securetar-2025.2.1-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
+creating '/build/reproducible-path/python-securetar-2025.2.1/.pybuild/cpython3_3.13/.tmp-5bs3psos/securetar-2025.2.1-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
 adding 'securetar/__init__.py'
 adding 'securetar-2025.2.1.dist-info/LICENSE'
 adding 'securetar-2025.2.1.dist-info/METADATA'
@@ -584,7 +620,7 @@
 tests/test_tar.py::test_create_encrypted_tar[10240] PASSED               [ 26%]
 tests/test_tar.py::test_create_encrypted_tar[4194304] PASSED             [ 28%]
 tests/test_tar.py::test_create_encrypted_tar_fixed_nonce[None-False] PASSED [ 30%]
-tests/test_tar.py::test_create_encrypted_tar_fixed_nonce[\xc9\xe7\xb7\xa2\xf6\x9d\xbe\xb1\x04s\x81\xf3/\x8d\xe5\x8e-True] PASSED [ 32%]
+tests/test_tar.py::test_create_encrypted_tar_fixed_nonce[\x15\xbd\xa5}]\xeaUB,\xda|r\xc24\x0f\x17-True] PASSED [ 32%]
 tests/test_tar.py::test_tar_inside_tar[True-inner_tar_files0] PASSED     [ 34%]
 tests/test_tar.py::test_tar_inside_tar[False-inner_tar_files1] PASSED    [ 36%]
 tests/test_tar.py::test_tar_inside_tar_encrypt[True-inner_tar_files0-33] PASSED [ 39%]
@@ -681,7 +717,7 @@
     tar_file.extractall(path=temp_new, members=tar_file)
 
 -- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
-======================= 46 passed, 52 warnings in 3.28s ========================
+======================= 46 passed, 52 warnings in 0.48s ========================
 rm -r ./.pybuild/*/build/tests ./.pybuild/*/build/core*tar.gz*
 make[1]: Leaving directory '/build/reproducible-path/python-securetar-2025.2.1'
    create-stamp debian/debhelper-build-stamp
@@ -711,12 +747,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: not including original source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1217198/tmp/hooks/B01_cleanup finished
 I: unmounting dev/ptmx filesystem
 I: unmounting dev/pts filesystem
 I: unmounting dev/shm filesystem
 I: unmounting proc filesystem
 I: unmounting sys filesystem
 I: cleaning the build env 
-I: removing directory /srv/workspace/pbuilder/3439889 and its subdirectories
-I: Current time: Wed Apr  9 20:26:06 -12 2025
-I: pbuilder-time-stamp: 1744273566
+I: removing directory /srv/workspace/pbuilder/1217198 and its subdirectories
+I: Current time: Thu May 14 04:49:49 +14 2026
+I: pbuilder-time-stamp: 1778683789