Diff of the two buildlogs:

--
--- b1/build.log	2024-05-09 13:16:04.865504053 +0000
+++ b2/build.log	2024-05-09 13:17:47.513135655 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Jun 11 07:37:56 -12 2025
-I: pbuilder-time-stamp: 1749670676
+I: Current time: Fri May 10 03:16:07 +14 2024
+I: pbuilder-time-stamp: 1715260567
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking autothemer-el_0.2.17-2.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/234678/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/3292181/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos1-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  9 13:16 /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/3292181/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/3292181/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=42 '
-  DISTRIBUTION='trixie'
-  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]="21" [3]="1" [4]="release" [5]="x86_64-pc-linux-gnu")
+  BASH_VERSION='5.2.21(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=20 '
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=x86_64
+  HOST_ARCH=amd64
   IFS=' 	
   '
-  INVOCATION_ID='143201085aa94d04a65b57bef2643177'
-  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='234678'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=3016b640dd3f46268f08bce1d7b05a97
+  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=3292181
   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.tiGhVUrE/pbuilderrc_8GgX --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.tiGhVUrE/b1 --logfile b1/build.log autothemer-el_0.2.17-2.dsc'
-  SUDO_GID='110'
-  SUDO_UID='105'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://213.165.73.152:3128'
+  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.tiGhVUrE/pbuilderrc_4yc4 --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.tiGhVUrE/b2 --logfile b2/build.log autothemer-el_0.2.17-2.dsc'
+  SUDO_GID=110
+  SUDO_UID=105
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://46.16.76.132:3128
 I: uname -a
-  Linux ionos5-amd64 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Jun 10 17:46 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/234678/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May  8 11:26 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/3292181/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -229,7 +261,7 @@
 Get: 117 http://deb.debian.org/debian trixie/main amd64 dh-elpa all 2.0.17 [31.0 kB]
 Get: 118 http://deb.debian.org/debian trixie/main amd64 dh-elpa-helper all 2.0.17 [8268 B]
 Get: 119 http://deb.debian.org/debian trixie/main amd64 elpa-dash all 2.19.1+git20220608.1.0ac1ecf+dfsg-1 [62.2 kB]
-Fetched 92.5 MB in 1s (93.2 MB/s)
+Fetched 92.5 MB in 2s (37.5 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libapparmor1:amd64.
 (Reading database ... 
(Reading database ... 5%
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(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 ... 19699 files and directories currently installed.)
@@ -751,7 +783,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/autothemer-el-0.2.17/ && 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  > ../autothemer-el_0.2.17-2_source.changes
+I: user script /srv/workspace/pbuilder/3292181/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/3292181/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/autothemer-el-0.2.17/ && 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  > ../autothemer-el_0.2.17-2_source.changes
 dpkg-buildpackage: info: source package autothemer-el
 dpkg-buildpackage: info: source version 0.2.17-2
 dpkg-buildpackage: info: source distribution unstable
@@ -769,35 +805,35 @@
 	emacs -batch -Q -l package --eval "(add-to-list 'package-directory-list \"/usr/share/emacs/site-lisp/elpa\")" --eval "(add-to-list 'package-directory-list \"/usr/share/emacs/site-lisp/elpa-src\")" -f package-initialize -L . -L tests --eval "(progn (setq ert-batch-backtrace-right-margin 500) (load-library \"dash\") (load-library \"autothemer\"))" -l tests/autothemer-tests.el --eval \(ert-run-tests-batch-and-exit\)
 Loading dash...
 Loading /build/reproducible-path/autothemer-el-0.2.17/autothemer.el (source)...
-Running 26 tests (2025-06-11 19:39:00+0000, selector `t')
-   passed   1/26  autothemer--color-distance (0.000230 sec)
-   passed   2/26  autothemer--color-to-hsv (0.000247 sec)
-   passed   3/26  autothemer--colorize-alist (0.000091 sec)
-   passed   4/26  autothemer-brightness-grouping (0.000474 sec)
-   passed   5/26  autothemer-cie-de2000 (0.000227 sec)
-   passed   6/26  autothemer-color-brightness (0.000298 sec)
-   passed   7/26  autothemer-color-hue (0.000268 sec)
-   passed   8/26  autothemer-color-hue-grouping (0.000950 sec)
-   passed   9/26  autothemer-color-sat (0.000304 sec)
-   passed  10/26  autothemer-group-and-sort (0.006635 sec)
-   passed  11/26  autothemer-group-colors (0.000536 sec)
-   passed  12/26  autothemer-groups-to-palette (0.000067 sec)
-   passed  13/26  autothemer-hex-to-rgb (0.000132 sec)
-   passed  14/26  autothemer-plist-bind (0.000076 sec)
-   passed  15/26  autothemer-rgb-to-hex (0.000153 sec)
-   passed  16/26  autothemer-saturation-grouping (0.000706 sec)
-   passed  17/26  color-name (0.000073 sec)
-   passed  18/26  color-value (0.000072 sec)
-   passed  19/26  current-theme (0.000078 sec)
-   passed  20/26  let-palette (0.000070 sec)
-   passed  21/26  spec-name (0.000069 sec)
-   passed  22/26  theme-has-colors (0.000067 sec)
-   passed  23/26  theme-has-description (0.000068 sec)
-   passed  24/26  theme-has-face-specs (0.000065 sec)
-   passed  25/26  theme-has-name (0.000088 sec)
-   passed  26/26  unindent (0.000095 sec)
+Running 26 tests (2024-05-09 13:17:38+0000, selector `t')
+   passed   1/26  autothemer--color-distance (0.000304 sec)
+   passed   2/26  autothemer--color-to-hsv (0.000348 sec)
+   passed   3/26  autothemer--colorize-alist (0.000102 sec)
+   passed   4/26  autothemer-brightness-grouping (0.000781 sec)
+   passed   5/26  autothemer-cie-de2000 (0.000314 sec)
+   passed   6/26  autothemer-color-brightness (0.000465 sec)
+   passed   7/26  autothemer-color-hue (0.000389 sec)
+   passed   8/26  autothemer-color-hue-grouping (0.001655 sec)
+   passed   9/26  autothemer-color-sat (0.000591 sec)
+   passed  10/26  autothemer-group-and-sort (0.013784 sec)
+   passed  11/26  autothemer-group-colors (0.000991 sec)
+   passed  12/26  autothemer-groups-to-palette (0.000084 sec)
+   passed  13/26  autothemer-hex-to-rgb (0.000209 sec)
+   passed  14/26  autothemer-plist-bind (0.000077 sec)
+   passed  15/26  autothemer-rgb-to-hex (0.000172 sec)
+   passed  16/26  autothemer-saturation-grouping (0.000793 sec)
+   passed  17/26  color-name (0.000083 sec)
+   passed  18/26  color-value (0.000075 sec)
+   passed  19/26  current-theme (0.000075 sec)
+   passed  20/26  let-palette (0.000074 sec)
+   passed  21/26  spec-name (0.000071 sec)
+   passed  22/26  theme-has-colors (0.000073 sec)
+   passed  23/26  theme-has-description (0.000071 sec)
+   passed  24/26  theme-has-face-specs (0.000071 sec)
+   passed  25/26  theme-has-name (0.000073 sec)
+   passed  26/26  unindent (0.000114 sec)
 
-Ran 26 tests, 26 results as expected, 0 unexpected (2025-06-11 19:39:00+0000, 0.013980 sec)
+Ran 26 tests, 26 results as expected, 0 unexpected (2024-05-09 13:17:39+0000, 0.025426 sec)
 
    create-stamp debian/debhelper-build-stamp
    dh_prep
@@ -823,12 +859,14 @@
 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/3292181/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/3292181/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/234678 and its subdirectories
-I: Current time: Wed Jun 11 07:39:03 -12 2025
-I: pbuilder-time-stamp: 1749670743
+I: removing directory /srv/workspace/pbuilder/3292181 and its subdirectories
+I: Current time: Fri May 10 03:17:46 +14 2024
+I: pbuilder-time-stamp: 1715260666