Diff of the two buildlogs:

--
--- b1/build.log	2025-01-06 09:16:32.812489185 +0000
+++ b2/build.log	2025-01-06 09:19:05.849496590 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Jan  5 21:11:13 -12 2025
-I: pbuilder-time-stamp: 1736154673
+I: Current time: Mon Jan  6 23:16:45 +14 2025
+I: pbuilder-time-stamp: 1736155005
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -27,52 +27,84 @@
 dpkg-source: info: applying 0001.Added-function-close-to-function-mock-calls.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/32465/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/22599/tmp/hooks/D01_modify_environment starting
+debug: Running on virt64b.
+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 Jan  6 09:17 /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/22599/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/22599/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='armhf'
-  DEBIAN_FRONTEND='noninteractive'
-  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=3 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='armhf'
+  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]="arm-unknown-linux-gnueabihf")
+  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=armhf
+  DEBIAN_FRONTEND=noninteractive
+  DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=4 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=arm
+  HOST_ARCH=armhf
   IFS=' 	
   '
-  INVOCATION_ID='fde8ffb90c4344b98154ca74aadb5dff'
-  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='32465'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=99a2561bab3248f9b35f3a9f70cff45a
+  LANG=C
+  LANGUAGE=it_CH:it
+  LC_ALL=C
+  MACHTYPE=arm-unknown-linux-gnueabihf
+  MAIL=/var/mail/root
+  OPTERR=1
+  OPTIND=1
+  OSTYPE=linux-gnueabihf
+  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=22599
   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.WCQ5dCgj/pbuilderrc_5JJ7 --distribution trixie --hookdir /etc/pbuilder/first-build-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.WCQ5dCgj/b1 --logfile b1/build.log yarsync_0.2.1-4.dsc'
-  SUDO_GID='113'
-  SUDO_UID='107'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://10.0.0.15:3142/'
+  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.WCQ5dCgj/pbuilderrc_HJuJ --distribution trixie --hookdir /etc/pbuilder/rebuild-hooks --debbuildopts -b --basetgz /var/cache/pbuilder/trixie-reproducible-base.tgz --buildresult /srv/reproducible-results/rbuild-debian/r-b-build.WCQ5dCgj/b2 --logfile b2/build.log yarsync_0.2.1-4.dsc'
+  SUDO_GID=113
+  SUDO_UID=107
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://10.0.0.15:3142/
 I: uname -a
-  Linux wbq0 6.1.0-28-armmp #1 SMP Debian 6.1.119-1 (2024-11-22) armv7l GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-28-arm64 #1 SMP Debian 6.1.119-1 (2024-11-22) aarch64 GNU/Linux
 I: ls -l /bin
   lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/32465/tmp/hooks/D02_print_environment finished
+I: user script /srv/workspace/pbuilder/22599/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -85,7 +117,7 @@
 Depends: debhelper-compat (= 13), dh-python, python3-setuptools, python3-all, python3-pytest, python3-pytest-cov, python3-pytest-mock, rsync, pybuild-plugin-pyproject
 dpkg-deb: building package 'pbuilder-satisfydepends-dummy' in '/tmp/satisfydepends-aptitude/pbuilder-satisfydepends-dummy.deb'.
 Selecting previously unselected package pbuilder-satisfydepends-dummy.
-(Reading database ... 19679 files and directories currently installed.)
+(Reading database ... 19675 files and directories currently installed.)
 Preparing to unpack .../pbuilder-satisfydepends-dummy.deb ...
 Unpacking pbuilder-satisfydepends-dummy (0.invalid.0) ...
 dpkg: pbuilder-satisfydepends-dummy: dependency problems, but configuring anyway as you requested:
@@ -213,10 +245,10 @@
 Get: 87 http://deb.debian.org/debian trixie/main armhf python3-pytest all 8.3.3-1 [249 kB]
 Get: 88 http://deb.debian.org/debian trixie/main armhf python3-pytest-cov all 5.0.0-1 [26.8 kB]
 Get: 89 http://deb.debian.org/debian trixie/main armhf python3-pytest-mock all 3.14.0-2 [18.3 kB]
-Fetched 33.8 MB in 4s (9598 kB/s)
+Fetched 33.8 MB in 1s (22.9 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package libjs-jquery.
-(Reading database ... 
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+(Reading database ... 
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(Reading database ... 19675 files and directories currently installed.)
 Preparing to unpack .../libjs-jquery_3.6.1+dfsg+~3.5.14-1_all.deb ...
 Unpacking libjs-jquery (3.6.1+dfsg+~3.5.14-1) ...
 Selecting previously unselected package libjs-jquery-hotkeys.
@@ -235,7 +267,7 @@
 Setting up libexpat1:armhf (2.6.4-1) ...
 Setting up python3.12-minimal (3.12.8-3) ...
 Selecting previously unselected package python3-minimal.
-(Reading database ... 
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(Reading database ... 20025 files and directories currently installed.)
+(Reading database ... 
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(Reading database ... 20021 files and directories currently installed.)
 Preparing to unpack .../00-python3-minimal_3.12.8-1_armhf.deb ...
 Unpacking python3-minimal (3.12.8-1) ...
 Selecting previously unselected package media-types.
@@ -297,7 +329,7 @@
 Unpacking libpython3-stdlib:armhf (3.12.8-1) ...
 Setting up python3-minimal (3.12.8-1) ...
 Selecting previously unselected package python3.
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(Reading database ... 21088 files and directories currently installed.)
+(Reading database ... 
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(Reading database ... 21084 files and directories currently installed.)
 Preparing to unpack .../00-python3_3.12.8-1_armhf.deb ...
 Unpacking python3 (3.12.8-1) ...
 Selecting previously unselected package libpython3.13-minimal:armhf.
@@ -515,8 +547,8 @@
 Setting up tzdata (2024b-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Jan  6 09:13:20 UTC 2025.
-Universal Time is now:  Mon Jan  6 09:13:20 UTC 2025.
+Local time is now:      Mon Jan  6 09:17:51 UTC 2025.
+Universal Time is now:  Mon Jan  6 09:17:51 UTC 2025.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up libpython3.13-minimal:armhf (3.13.1-2) ...
@@ -600,7 +632,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/yarsync-0.2.1/ && 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  > ../yarsync_0.2.1-4_source.changes
+I: user script /srv/workspace/pbuilder/22599/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/22599/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/yarsync-0.2.1/ && 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  > ../yarsync_0.2.1-4_source.changes
 dpkg-buildpackage: info: source package yarsync
 dpkg-buildpackage: info: source version 0.2.1-4
 dpkg-buildpackage: info: source distribution unstable
@@ -650,7 +686,7 @@
 Copying yarsync.egg-info to build/bdist.linux-armv7l/wheel/./yarsync-0.2.1.egg-info
 running install_scripts
 creating build/bdist.linux-armv7l/wheel/yarsync-0.2.1.dist-info/WHEEL
-creating '/build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.13_yarsync/.tmp-bv_3lphw/yarsync-0.2.1-py3-none-any.whl' and adding 'build/bdist.linux-armv7l/wheel' to it
+creating '/build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.13_yarsync/.tmp-hwr4s_o_/yarsync-0.2.1-py3-none-any.whl' and adding 'build/bdist.linux-armv7l/wheel' to it
 adding 'yarsync/__init__.py'
 adding 'yarsync/version.py'
 adding 'yarsync/yarsync.py'
@@ -689,7 +725,7 @@
 Copying yarsync.egg-info to build/bdist.linux-armv7l/wheel/./yarsync-0.2.1.egg-info
 running install_scripts
 creating build/bdist.linux-armv7l/wheel/yarsync-0.2.1.dist-info/WHEEL
-creating '/build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.12_yarsync/.tmp-kz_49w25/yarsync-0.2.1-py3-none-any.whl' and adding 'build/bdist.linux-armv7l/wheel' to it
+creating '/build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.12_yarsync/.tmp-u1t_qf27/yarsync-0.2.1-py3-none-any.whl' and adding 'build/bdist.linux-armv7l/wheel' to it
 adding 'yarsync/__init__.py'
 adding 'yarsync/version.py'
 adding 'yarsync/yarsync.py'
@@ -708,7 +744,7 @@
 platform linux -- Python 3.13.1, pytest-8.3.3, pluggy-1.5.0
 rootdir: /build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.13_yarsync/build
 configfile: pytest.ini
-plugins: typeguard-4.4.1, mock-3.14.0, cov-5.0.0
+plugins: cov-5.0.0, mock-3.14.0, typeguard-4.4.1
 collected 31 items
 
 tests/test_commit.py ......                                              [ 19%]
@@ -720,13 +756,13 @@
 tests/test_sync.py ..                                                    [ 74%]
 tests/test_ys_helpers.py ........                                        [100%]
 
-============================== 31 passed in 4.61s ==============================
+============================== 31 passed in 2.79s ==============================
 I: pybuild base:311: cd /build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.12_yarsync/build; python3.12 -m pytest --ignore=tests/test_clone.py --ignore=tests/test_status.py
 ============================= test session starts ==============================
 platform linux -- Python 3.12.8, pytest-8.3.3, pluggy-1.5.0
 rootdir: /build/reproducible-path/yarsync-0.2.1/.pybuild/cpython3_3.12_yarsync/build
 configfile: pytest.ini
-plugins: typeguard-4.4.1, mock-3.14.0, cov-5.0.0
+plugins: cov-5.0.0, mock-3.14.0, typeguard-4.4.1
 collected 31 items
 
 tests/test_commit.py ......                                              [ 19%]
@@ -738,7 +774,7 @@
 tests/test_sync.py ..                                                    [ 74%]
 tests/test_ys_helpers.py ........                                        [100%]
 
-============================== 31 passed in 5.46s ==============================
+============================== 31 passed in 3.05s ==============================
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=pybuild
    dh_prep -O--buildsystem=pybuild
@@ -768,12 +804,14 @@
 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/22599/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/22599/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/32465 and its subdirectories
-I: Current time: Sun Jan  5 21:16:28 -12 2025
-I: pbuilder-time-stamp: 1736154988
+I: removing directory /srv/workspace/pbuilder/22599 and its subdirectories
+I: Current time: Mon Jan  6 23:19:02 +14 2025
+I: pbuilder-time-stamp: 1736155142