Diff of the two buildlogs:

--
--- b1/build.log	2025-01-27 12:18:43.058085568 +0000
+++ b2/build.log	2025-01-27 12:19:58.598673987 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Jan 27 00:15:33 -12 2025
-I: pbuilder-time-stamp: 1737980133
+I: Current time: Mon Mar  2 08:41:44 +14 2026
+I: pbuilder-time-stamp: 1772390504
 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 cppy_1.3.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1703495/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1963423/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 Mar  1 18:41 /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/1963423/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1963423/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='91c05f8eb73c4ca09322dd974f1d0e7c'
-  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='1703495'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=52dd68f5ddcc4a8f94047af0f25443f1
+  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=1963423
   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.Ho1B8FXA/pbuilderrc_VMIf --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.Ho1B8FXA/b1 --logfile b1/build.log cppy_1.3.0-1.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.Ho1B8FXA/pbuilderrc_8eCZ --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.Ho1B8FXA/b2 --logfile b2/build.log cppy_1.3.0-1.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 6.1.0-30-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.124-1 (2025-01-12) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.12.9+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.12.9-1~bpo12+1 (2025-01-19) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1703495/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1963423/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -235,7 +267,7 @@
 Get: 114 http://deb.debian.org/debian unstable/main amd64 sphinx-rtd-theme-common all 3.0.2+dfsg-2 [1023 kB]
 Get: 115 http://deb.debian.org/debian unstable/main amd64 python3-sphinxcontrib.jquery all 4.1-5 [7348 B]
 Get: 116 http://deb.debian.org/debian unstable/main amd64 python3-sphinx-rtd-theme all 3.0.2+dfsg-2 [29.7 kB]
-Fetched 66.1 MB in 8s (7854 kB/s)
+Fetched 66.1 MB in 1s (93.0 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package fonts-lato.
 (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 ... 19832 files and directories currently installed.)
@@ -620,8 +652,8 @@
 Setting up tzdata (2025a-1) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Jan 27 12:17:18 UTC 2025.
-Universal Time is now:  Mon Jan 27 12:17:18 UTC 2025.
+Local time is now:      Sun Mar  1 18:42:25 UTC 2026.
+Universal Time is now:  Sun Mar  1 18:42:25 UTC 2026.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up autotools-dev (20220109.1) ...
@@ -738,7 +770,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/cppy-1.3.0/ && 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  > ../cppy_1.3.0-1_source.changes
+I: user script /srv/workspace/pbuilder/1963423/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/1963423/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/cppy-1.3.0/ && 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  > ../cppy_1.3.0-1_source.changes
 dpkg-buildpackage: info: source package cppy
 dpkg-buildpackage: info: source version 1.3.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -764,8 +800,8 @@
 running build
 running build_py
 creating build/lib/cppy
-copying cppy/__init__.py -> build/lib/cppy
 copying cppy/version.py -> build/lib/cppy
+copying cppy/__init__.py -> build/lib/cppy
 running egg_info
 writing cppy.egg-info/PKG-INFO
 writing dependency_links to cppy.egg-info/dependency_links.txt
@@ -831,19 +867,19 @@
 running install_lib
 creating build/bdist.linux-x86_64/wheel
 creating build/bdist.linux-x86_64/wheel/cppy
-copying build/lib/cppy/__init__.py -> build/bdist.linux-x86_64/wheel/./cppy
+copying build/lib/cppy/version.py -> build/bdist.linux-x86_64/wheel/./cppy
 creating build/bdist.linux-x86_64/wheel/cppy/include
 creating build/bdist.linux-x86_64/wheel/cppy/include/cppy
-copying build/lib/cppy/include/cppy/cppy.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
-copying build/lib/cppy/include/cppy/ptr.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
 copying build/lib/cppy/include/cppy/defines.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
+copying build/lib/cppy/include/cppy/ptr.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
 copying build/lib/cppy/include/cppy/errors.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
-copying build/lib/cppy/version.py -> build/bdist.linux-x86_64/wheel/./cppy
+copying build/lib/cppy/include/cppy/cppy.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
+copying build/lib/cppy/__init__.py -> build/bdist.linux-x86_64/wheel/./cppy
 running install_egg_info
 Copying cppy.egg-info to build/bdist.linux-x86_64/wheel/./cppy-1.3.0.egg-info
 running install_scripts
 creating build/bdist.linux-x86_64/wheel/cppy-1.3.0.dist-info/WHEEL
-creating '/build/reproducible-path/cppy-1.3.0/.pybuild/cpython3_3.12_cppy/.tmp-34dumevz/cppy-1.3.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
+creating '/build/reproducible-path/cppy-1.3.0/.pybuild/cpython3_3.12_cppy/.tmp-gnal253m/cppy-1.3.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
 adding 'cppy/__init__.py'
 adding 'cppy/version.py'
 adding 'cppy/include/cppy/cppy.h'
@@ -925,19 +961,19 @@
 running install_lib
 creating build/bdist.linux-x86_64/wheel
 creating build/bdist.linux-x86_64/wheel/cppy
-copying build/lib/cppy/__init__.py -> build/bdist.linux-x86_64/wheel/./cppy
+copying build/lib/cppy/version.py -> build/bdist.linux-x86_64/wheel/./cppy
 creating build/bdist.linux-x86_64/wheel/cppy/include
 creating build/bdist.linux-x86_64/wheel/cppy/include/cppy
-copying build/lib/cppy/include/cppy/cppy.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
-copying build/lib/cppy/include/cppy/ptr.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
 copying build/lib/cppy/include/cppy/defines.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
+copying build/lib/cppy/include/cppy/ptr.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
 copying build/lib/cppy/include/cppy/errors.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
-copying build/lib/cppy/version.py -> build/bdist.linux-x86_64/wheel/./cppy
+copying build/lib/cppy/include/cppy/cppy.h -> build/bdist.linux-x86_64/wheel/./cppy/include/cppy
+copying build/lib/cppy/__init__.py -> build/bdist.linux-x86_64/wheel/./cppy
 running install_egg_info
 Copying cppy.egg-info to build/bdist.linux-x86_64/wheel/./cppy-1.3.0.egg-info
 running install_scripts
 creating build/bdist.linux-x86_64/wheel/cppy-1.3.0.dist-info/WHEEL
-creating '/build/reproducible-path/cppy-1.3.0/.pybuild/cpython3_3.13_cppy/.tmp-a9lu9012/cppy-1.3.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
+creating '/build/reproducible-path/cppy-1.3.0/.pybuild/cpython3_3.13_cppy/.tmp-qhzp5vmp/cppy-1.3.0-py3-none-any.whl' and adding 'build/bdist.linux-x86_64/wheel' to it
 adding 'cppy/__init__.py'
 adding 'cppy/version.py'
 adding 'cppy/include/cppy/cppy.h'
@@ -963,7 +999,7 @@
 
 tests/test_getting_include_dir.py .                                      [100%]
 
-============================== 1 passed in 0.20s ===============================
+============================== 1 passed in 0.09s ===============================
 I: pybuild base:311: cd /build/reproducible-path/cppy-1.3.0/.pybuild/cpython3_3.13_cppy/build; python3.13 -m pytest tests
 ============================= test session starts ==============================
 platform linux -- Python 3.13.1, pytest-8.3.4, pluggy-1.5.0
@@ -974,7 +1010,7 @@
 
 tests/test_getting_include_dir.py .                                      [100%]
 
-============================== 1 passed in 0.17s ===============================
+============================== 1 passed in 0.09s ===============================
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -1000,9 +1036,9 @@
 preparing documents... done
 copying assets... 
 copying static files... 
+Writing evaluated template result to /build/reproducible-path/cppy-1.3.0/debian/python-cppy-doc/usr/share/doc/python-cppy-doc/html/_static/documentation_options.js
 Writing evaluated template result to /build/reproducible-path/cppy-1.3.0/debian/python-cppy-doc/usr/share/doc/python-cppy-doc/html/_static/language_data.js
 Writing evaluated template result to /build/reproducible-path/cppy-1.3.0/debian/python-cppy-doc/usr/share/doc/python-cppy-doc/html/_static/basic.css
-Writing evaluated template result to /build/reproducible-path/cppy-1.3.0/debian/python-cppy-doc/usr/share/doc/python-cppy-doc/html/_static/documentation_options.js
 Writing evaluated template result to /build/reproducible-path/cppy-1.3.0/debian/python-cppy-doc/usr/share/doc/python-cppy-doc/html/_static/js/versions.js
 copying static files: done
 copying extra files... 
@@ -1066,12 +1102,14 @@
 dpkg-buildpackage: info: binary-only upload (no source included)
 dpkg-genchanges: info: including full source code in upload
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/1963423/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1963423/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/1703495 and its subdirectories
-I: Current time: Mon Jan 27 00:18:42 -12 2025
-I: pbuilder-time-stamp: 1737980322
+I: removing directory /srv/workspace/pbuilder/1963423 and its subdirectories
+I: Current time: Mon Mar  2 08:42:58 +14 2026
+I: pbuilder-time-stamp: 1772390578