Diff of the two buildlogs:

--
--- b1/build.log	2024-04-29 15:09:28.387613225 +0000
+++ b2/build.log	2024-04-29 15:11:09.715295910 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Mon Apr 29 03:08:21 -12 2024
-I: pbuilder-time-stamp: 1714403301
+I: Current time: Tue Apr 30 05:09:31 +14 2024
+I: pbuilder-time-stamp: 1714403371
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/trixie-reproducible-base.tgz]
 I: copying local configuration
@@ -30,52 +30,84 @@
 dpkg-source: info: applying 0005-Fix-syntax-for-ruby-haml-6.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/2844136/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/1020374/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 Apr 29 15:09 /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/1020374/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/1020374/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]="21" [3]="1" [4]="release" [5]="aarch64-unknown-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=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='38c34eff9f0d4928a870072cf7137500'
-  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='2844136'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=335e54ae136545799678b7886ba887ff
+  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=1020374
   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.80wQbVvb/pbuilderrc_tmRn --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.80wQbVvb/b1 --logfile b1/build.log ruby-handlebars-assets_0.23.9+dfsg-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.80wQbVvb/pbuilderrc_fXv1 --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.80wQbVvb/b2 --logfile b2/build.log ruby-handlebars-assets_0.23.9+dfsg-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 codethink02-arm64 6.1.0-20-cloud-arm64 #1 SMP Debian 6.1.85-1 (2024-04-11) aarch64 GNU/Linux
+  Linux i-capture-the-hostname 6.1.0-20-cloud-arm64 #1 SMP Debian 6.1.85-1 (2024-04-11) aarch64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 Apr 21 07:15 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/2844136/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Apr 23 11:23 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/1020374/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -404,7 +436,7 @@
 Get: 148 http://deb.debian.org/debian trixie/main arm64 ruby-rack all 2.2.7-1 [132 kB]
 Get: 149 http://deb.debian.org/debian trixie/main arm64 ruby-slim all 4.1.0-3 [57.1 kB]
 Get: 150 http://deb.debian.org/debian trixie/main arm64 ruby-sprockets all 3.7.2-4 [65.6 kB]
-Fetched 60.7 MB in 0s (142 MB/s)
+Fetched 60.7 MB in 0s (186 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 dpkg: libdb5.3:arm64: dependency problems, but removing anyway as you requested:
  libperl5.38:arm64 depends on libdb5.3.
@@ -920,8 +952,8 @@
 Setting up tzdata (2024a-3) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Mon Apr 29 15:08:47 UTC 2024.
-Universal Time is now:  Mon Apr 29 15:08:47 UTC 2024.
+Local time is now:      Mon Apr 29 15:10:13 UTC 2024.
+Universal Time is now:  Mon Apr 29 15:10:13 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up ruby-temple (0.10.3-1) ...
@@ -1053,7 +1085,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/ruby-handlebars-assets-0.23.9+dfsg/ && 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  > ../ruby-handlebars-assets_0.23.9+dfsg-1_source.changes
+I: user script /srv/workspace/pbuilder/1020374/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for trixie
+I: user script /srv/workspace/pbuilder/1020374/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/ruby-handlebars-assets-0.23.9+dfsg/ && 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  > ../ruby-handlebars-assets_0.23.9+dfsg-1_source.changes
 dpkg-buildpackage: info: source package ruby-handlebars-assets
 dpkg-buildpackage: info: source version 2:0.23.9+dfsg-1
 dpkg-buildpackage: info: source distribution unstable
@@ -1088,7 +1124,7 @@
    dh_prep -O--buildsystem=ruby
    dh_auto_install --destdir=debian/ruby-handlebars-assets/ -O--buildsystem=ruby
 	dh_ruby --install /build/reproducible-path/ruby-handlebars-assets-0.23.9\+dfsg/debian/ruby-handlebars-assets
-/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20240429-2851341-7l1k9y/gemspec
+/usr/bin/ruby3.1 -S gem build --config-file /dev/null --verbose /tmp/d20240430-1041467-bhy1fq/gemspec
 Failed to load /dev/null because it doesn't contain valid YAML hash
 WARNING:  open-ended dependency on tilt (>= 1.2) is not recommended
   if tilt is semantically versioned, use:
@@ -1103,7 +1139,7 @@
   Name: handlebars_assets
   Version: 0.23.9
   File: handlebars_assets-0.23.9.gem
-/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-handlebars-assets/usr/share/rubygems-integration/all /tmp/d20240429-2851341-7l1k9y/handlebars_assets-0.23.9.gem
+/usr/bin/ruby3.1 -S gem install --config-file /dev/null --verbose --local --verbose --no-document --ignore-dependencies --install-dir debian/ruby-handlebars-assets/usr/share/rubygems-integration/all /tmp/d20240430-1041467-bhy1fq/handlebars_assets-0.23.9.gem
 Failed to load /dev/null because it doesn't contain valid YAML hash
 /build/reproducible-path/ruby-handlebars-assets-0.23.9+dfsg/debian/ruby-handlebars-assets/usr/share/rubygems-integration/all/gems/handlebars_assets-0.23.9/lib/handlebars_assets.rb
 /build/reproducible-path/ruby-handlebars-assets-0.23.9+dfsg/debian/ruby-handlebars-assets/usr/share/rubygems-integration/all/gems/handlebars_assets-0.23.9/lib/handlebars_assets/config.rb
@@ -1149,7 +1185,7 @@
 
 ............................
 
-Finished in 23.922263s, 1.1705 runs/s, 2.0901 assertions/s.
+Finished in 29.322627s, 0.9549 runs/s, 1.7052 assertions/s.
 
 28 runs, 50 assertions, 0 failures, 0 errors, 0 skips
 
@@ -1187,12 +1223,14 @@
 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/1020374/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/1020374/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/2844136 and its subdirectories
-I: Current time: Mon Apr 29 03:09:27 -12 2024
-I: pbuilder-time-stamp: 1714403367
+I: removing directory /srv/workspace/pbuilder/1020374 and its subdirectories
+I: Current time: Tue Apr 30 05:11:08 +14 2024
+I: pbuilder-time-stamp: 1714403468