Diff of the two buildlogs:

--
--- b1/build.log	2025-03-09 07:01:54.341904346 +0000
+++ b2/build.log	2025-03-09 07:02:55.655134419 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sat Apr 11 01:24:04 -12 2026
-I: pbuilder-time-stamp: 1775913844
+I: Current time: Sun Mar  9 21:01:57 +14 2025
+I: pbuilder-time-stamp: 1741503717
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -22,52 +22,84 @@
 dpkg-source: info: unpacking boohu_0.13.0-1.debian.tar.xz
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1128149/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/2631209/tmp/hooks/D01_modify_environment starting
+debug: Running on codethink04-arm64.
+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  9 07:02 /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/2631209/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/2631209/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='arm64'
-  DEBIAN_FRONTEND='noninteractive'
+  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]="aarch64-unknown-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=arm64
+  DEBIAN_FRONTEND=noninteractive
   DEB_BUILD_OPTIONS='buildinfo=+all reproducible=+all parallel=12 '
-  DISTRIBUTION='trixie'
-  HOME='/root'
-  HOST_ARCH='arm64'
+  DIRSTACK=()
+  DISTRIBUTION=trixie
+  EUID=0
+  FUNCNAME=([0]="Echo" [1]="main")
+  GROUPS=()
+  HOME=/root
+  HOSTNAME=i-capture-the-hostname
+  HOSTTYPE=aarch64
+  HOST_ARCH=arm64
   IFS=' 	
   '
-  INVOCATION_ID='b9ceb30f406f4425bbf224b75897c56e'
-  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='1128149'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=23bff272049c43ccbc3ab33081fe62a8
+  LANG=C
+  LANGUAGE=nl_BE:nl
+  LC_ALL=C
+  MACHTYPE=aarch64-unknown-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=2631209
   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.6SsHv19w/pbuilderrc_sQZ8 --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.6SsHv19w/b1 --logfile b1/build.log boohu_0.13.0-1.dsc'
-  SUDO_GID='109'
-  SUDO_UID='104'
-  SUDO_USER='jenkins'
-  TERM='unknown'
-  TZ='/usr/share/zoneinfo/Etc/GMT+12'
-  USER='root'
-  _='/usr/bin/systemd-run'
-  http_proxy='http://192.168.101.4:3128'
+  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.6SsHv19w/pbuilderrc_tuKL --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.6SsHv19w/b2 --logfile b2/build.log boohu_0.13.0-1.dsc'
+  SUDO_GID=109
+  SUDO_UID=104
+  SUDO_USER=jenkins
+  TERM=unknown
+  TZ=/usr/share/zoneinfo/Etc/GMT-14
+  UID=0
+  USER=root
+  _='I: set'
+  http_proxy=http://192.168.101.4:3128
 I: uname -a
-  Linux codethink03-arm64 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-31-cloud-arm64 #1 SMP Debian 6.1.128-1 (2025-02-07) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Nov 22  2024 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1128149/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Nov 22 14:40 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/2631209/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -149,7 +181,7 @@
 Get: 38 http://deb.debian.org/debian trixie/main arm64 golang-src all 2:1.24~2 [5136 B]
 Get: 39 http://deb.debian.org/debian trixie/main arm64 golang-go arm64 2:1.24~2 [44.3 kB]
 Get: 40 http://deb.debian.org/debian trixie/main arm64 golang-github-nsf-termbox-go-dev all 0.0~git20160914-3 [26.8 kB]
-Fetched 68.2 MB in 0s (241 MB/s)
+Fetched 68.2 MB in 0s (140 MB/s)
 Preconfiguring packages ...
 Selecting previously unselected package sensible-utils.
 (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 ... 19914 files and directories currently installed.)
@@ -324,7 +356,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/boohu-0.13.0/ && 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  > ../boohu_0.13.0-1_source.changes
+I: user script /srv/workspace/pbuilder/2631209/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/2631209/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/boohu-0.13.0/ && 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  > ../boohu_0.13.0-1_source.changes
 dpkg-buildpackage: info: source package boohu
 dpkg-buildpackage: info: source version 0.13.0-1
 dpkg-buildpackage: info: source distribution unstable
@@ -344,33 +380,33 @@
    dh_auto_build -O--buildsystem=golang
 	cd obj-aarch64-linux-gnu && go install -trimpath -v -p 12 git.tuxfamily.org/boohu/boohu
 internal/coverage/rtcov
-internal/byteorder
-internal/goarch
-internal/asan
+internal/profilerecord
 internal/unsafeheader
-internal/msan
+internal/goarch
+internal/goexperiment
 internal/goos
+internal/byteorder
 internal/godebugs
-internal/profilerecord
-internal/goexperiment
 internal/runtime/syscall
+internal/asan
+internal/msan
 internal/cpu
 internal/runtime/math
+sync/atomic
+internal/abi
 math/bits
 unicode/utf8
+unicode
 cmp
 internal/itoa
-sync/atomic
-internal/abi
-unicode
 encoding
 internal/chacha8rand
 log/internal
-github.com/rivo/uniseg
 math
+github.com/rivo/uniseg
 internal/bytealg
-internal/runtime/sys
 internal/runtime/atomic
+internal/runtime/sys
 internal/runtime/exithook
 internal/stringslite
 internal/race
@@ -380,48 +416,48 @@
 internal/reflectlite
 iter
 sync
-maps
 slices
-errors
-sort
+maps
 internal/bisect
 internal/testlog
+errors
+sort
 io
 internal/oserror
-path
 strconv
+path
 syscall
 internal/godebug
-hash
 bytes
 strings
+hash
 internal/saferio
 container/heap
 hash/adler32
 math/rand
 reflect
-bufio
 regexp/syntax
-time
+bufio
 internal/syscall/execenv
+time
 internal/syscall/unix
 regexp
-context
 io/fs
+context
 internal/poll
 internal/filepathlite
 os
 internal/fmtsort
 encoding/binary
 io/ioutil
-fmt
 github.com/mattn/go-runewidth
+fmt
 os/signal
 path/filepath
+compress/flate
 encoding/hex
 log
 flag
-compress/flate
 encoding/gob
 github.com/nsf/termbox-go
 compress/zlib
@@ -429,23 +465,23 @@
    dh_auto_test -O--buildsystem=golang
 	cd obj-aarch64-linux-gnu && go test -vet=off -v -p 12 git.tuxfamily.org/boohu/boohu
 === RUN   TestCellularAutomataCaveMap
---- PASS: TestCellularAutomataCaveMap (1.30s)
+--- PASS: TestCellularAutomataCaveMap (1.24s)
 === RUN   TestCaveMap
---- PASS: TestCaveMap (0.54s)
+--- PASS: TestCaveMap (0.35s)
 === RUN   TestCaveMapTree
---- PASS: TestCaveMapTree (0.34s)
+--- PASS: TestCaveMapTree (0.24s)
 === RUN   TestRuinsMap
---- PASS: TestRuinsMap (0.63s)
+--- PASS: TestRuinsMap (0.50s)
 === RUN   TestBSPMap
---- PASS: TestBSPMap (0.20s)
+--- PASS: TestBSPMap (0.16s)
 === RUN   TestRoomMap
---- PASS: TestRoomMap (0.13s)
+--- PASS: TestRoomMap (0.09s)
 === RUN   TestInitLevel
---- PASS: TestInitLevel (0.38s)
+--- PASS: TestInitLevel (0.40s)
 === RUN   TestDir
 --- PASS: TestDir (0.00s)
 PASS
-ok  	git.tuxfamily.org/boohu/boohu	3.537s
+ok  	git.tuxfamily.org/boohu/boohu	2.991s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -488,12 +524,14 @@
 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/2631209/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/2631209/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/1128149 and its subdirectories
-I: Current time: Sat Apr 11 01:24:51 -12 2026
-I: pbuilder-time-stamp: 1775913891
+I: removing directory /srv/workspace/pbuilder/2631209 and its subdirectories
+I: Current time: Sun Mar  9 21:02:54 +14 2025
+I: pbuilder-time-stamp: 1741503774