Diff of the two buildlogs:

--
--- b1/build.log	2024-05-21 21:51:27.868075708 +0000
+++ b2/build.log	2024-05-21 21:52:28.909474138 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Tue May 21 09:47:26 -12 2024
-I: pbuilder-time-stamp: 1716328046
+I: Current time: Tue Jun 24 18:14:31 +14 2025
+I: pbuilder-time-stamp: 1750738471
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -28,52 +28,84 @@
 dpkg-source: info: applying 01-fix-test-32bit-arch.patch
 I: Not using root during the build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1049805/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/636467/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 Jun 24 04:14 /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/636467/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/636467/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]="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=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='96796af3cfc2481fb94eef931c6c6cf0'
-  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='1049805'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=eb4fc8e4f4b34ec487ef13d063318d46
+  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=636467
   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.0vD7sdEL/pbuilderrc_t455 --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.0vD7sdEL/b1 --logfile b1/build.log golang-github-clusterhq-flocker-go_0.0~git20160209.0.1c0a791-3.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.0vD7sdEL/pbuilderrc_JbAJ --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.0vD7sdEL/b2 --logfile b2/build.log golang-github-clusterhq-flocker-go_0.0~git20160209.0.1c0a791-3.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 6.1.0-21-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.1.90-1 (2024-05-03) x86_64 GNU/Linux
+  Linux i-capture-the-hostname 6.6.13+bpo-amd64 #1 SMP PREEMPT_DYNAMIC Debian 6.6.13-1~bpo12+1 (2024-02-15) x86_64 GNU/Linux
 I: ls -l /bin
-  lrwxrwxrwx 1 root root 7 May 21 07:42 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1049805/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 Jun 22 14:05 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/636467/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -160,7 +192,7 @@
 Get: 43 http://deb.debian.org/debian unstable/main amd64 golang-github-stretchr-testify-dev all 1.9.0-1 [74.7 kB]
 Get: 44 http://deb.debian.org/debian unstable/main amd64 golang-src all 2:1.22~3 [5020 B]
 Get: 45 http://deb.debian.org/debian unstable/main amd64 golang-go amd64 2:1.22~3 [44.2 kB]
-Fetched 63.0 MB in 6s (10.4 MB/s)
+Fetched 63.0 MB in 1s (115 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 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 ... 19718 files and directories currently installed.)
@@ -355,7 +387,11 @@
 Building tag database...
  -> Finished parsing the build-deps
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-clusterhq-flocker-go-0.0~git20160209.0.1c0a791/ && 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  > ../golang-github-clusterhq-flocker-go_0.0~git20160209.0.1c0a791-3_source.changes
+I: user script /srv/workspace/pbuilder/636467/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/636467/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-clusterhq-flocker-go-0.0~git20160209.0.1c0a791/ && 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  > ../golang-github-clusterhq-flocker-go_0.0~git20160209.0.1c0a791-3_source.changes
 dpkg-buildpackage: info: source package golang-github-clusterhq-flocker-go
 dpkg-buildpackage: info: source version 0.0~git20160209.0.1c0a791-3
 dpkg-buildpackage: info: source distribution unstable
@@ -373,38 +409,38 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 20 github.com/ClusterHQ/flocker-go
-internal/unsafeheader
-internal/itoa
-math/bits
-crypto/internal/alias
-container/list
-internal/goos
-internal/goexperiment
-cmp
-internal/godebugs
+	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 42 github.com/ClusterHQ/flocker-go
+unicode/utf8
 internal/goarch
+internal/goos
+internal/race
 internal/coverage/rtcov
+internal/unsafeheader
+internal/godebugs
+cmp
+vendor/golang.org/x/crypto/cryptobyte/asn1
+crypto/subtle
+math/bits
 runtime/internal/atomic
-unicode/utf8
+container/list
+vendor/golang.org/x/crypto/internal/alias
+sync/atomic
+encoding
+log/internal
+crypto/internal/alias
+crypto/internal/boring/sig
 unicode/utf16
-vendor/golang.org/x/crypto/cryptobyte/asn1
 internal/nettrace
-vendor/golang.org/x/crypto/internal/alias
-internal/abi
-internal/chacha8rand
+internal/itoa
 runtime/internal/syscall
-internal/race
+internal/goexperiment
 unicode
 runtime/internal/math
-crypto/internal/boring/sig
+internal/chacha8rand
 runtime/internal/sys
-encoding
-log/internal
-sync/atomic
+internal/abi
 internal/cpu
 slices
-crypto/subtle
 internal/bytealg
 math
 runtime
@@ -415,89 +451,89 @@
 internal/singleflight
 runtime/cgo
 errors
-sort
 internal/godebug
+sort
+io
+internal/intern
+internal/safefilepath
+path
 math/rand
 internal/oserror
-path
 vendor/golang.org/x/net/dns/dnsmessage
-internal/safefilepath
+strconv
 crypto/internal/nistec/fiat
-io
-internal/intern
 syscall
-strconv
-bytes
 hash
 crypto/internal/randutil
+bytes
 strings
 hash/crc32
+vendor/golang.org/x/text/transform
 crypto
 crypto/rc4
-reflect
 net/netip
-vendor/golang.org/x/text/transform
-bufio
+reflect
 net/http/internal/ascii
+bufio
 internal/syscall/execenv
 internal/syscall/unix
 time
-encoding/binary
+context
+io/fs
+internal/poll
 internal/fmtsort
-crypto/cipher
-crypto/internal/edwards25519/field
+encoding/binary
+embed
+os
 crypto/md5
 encoding/base64
 vendor/golang.org/x/crypto/internal/poly1305
+crypto/internal/edwards25519/field
+crypto/cipher
+crypto/internal/nistec
 encoding/pem
+crypto/internal/edwards25519
+vendor/golang.org/x/crypto/chacha20
 crypto/internal/boring
 crypto/des
-vendor/golang.org/x/crypto/chacha20
-crypto/aes
 crypto/hmac
+crypto/sha256
 crypto/sha512
 crypto/sha1
-crypto/sha256
-crypto/internal/edwards25519
-context
-io/fs
-internal/poll
+crypto/aes
 vendor/golang.org/x/crypto/hkdf
-embed
-os
-crypto/internal/nistec
 crypto/ecdh
+io/ioutil
 fmt
 path/filepath
-io/ioutil
 vendor/golang.org/x/sys/cpu
+net
 vendor/golang.org/x/crypto/chacha20poly1305
 encoding/hex
 net/url
 log
 mime/quotedprintable
-vendor/golang.org/x/net/http2/hpack
-math/big
-vendor/golang.org/x/text/unicode/norm
-mime
 net/http/internal
 compress/flate
+mime
+vendor/golang.org/x/net/http2/hpack
 encoding/json
-net
+vendor/golang.org/x/text/unicode/norm
+math/big
 vendor/golang.org/x/text/unicode/bidi
 compress/gzip
 vendor/golang.org/x/text/secure/bidirule
 vendor/golang.org/x/net/idna
-crypto/elliptic
 crypto/internal/boring/bbig
 crypto/internal/bigmod
 crypto/rand
 crypto/dsa
+crypto/elliptic
 encoding/asn1
 crypto/ed25519
 crypto/rsa
-vendor/golang.org/x/crypto/cryptobyte
 crypto/x509/pkix
+vendor/golang.org/x/crypto/cryptobyte
 crypto/ecdsa
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
@@ -509,29 +545,29 @@
 net/http
 github.com/ClusterHQ/flocker-go
    dh_auto_test -O--buildsystem=golang
-	cd obj-x86_64-linux-gnu && go test -vet=off -v -p 20 github.com/ClusterHQ/flocker-go
+	cd obj-x86_64-linux-gnu && go test -vet=off -v -p 42 github.com/ClusterHQ/flocker-go
 === RUN   TestMaximumSizeIs1024Multiple
 --- PASS: TestMaximumSizeIs1024Multiple (0.00s)
 === RUN   TestPost
---- PASS: TestPost (0.01s)
+--- PASS: TestPost (0.00s)
 === RUN   TestGet
 --- PASS: TestGet (0.00s)
 === RUN   TestFindIDInConfigurationsPayload
---- PASS: TestFindIDInConfigurationsPayload (0.01s)
+--- PASS: TestFindIDInConfigurationsPayload (0.00s)
 === RUN   TestFindPrimaryUUID
 --- PASS: TestFindPrimaryUUID (0.00s)
 === RUN   TestGetURL
 --- PASS: TestGetURL (0.00s)
 === RUN   TestHappyPathCreateDatasetFromNonExistent
---- PASS: TestHappyPathCreateDatasetFromNonExistent (0.02s)
+--- PASS: TestHappyPathCreateDatasetFromNonExistent (0.00s)
 === RUN   TestCreateDatasetThatAlreadyExists
---- PASS: TestCreateDatasetThatAlreadyExists (0.01s)
+--- PASS: TestCreateDatasetThatAlreadyExists (0.00s)
 === RUN   TestUpdatePrimaryForDataset
 --- PASS: TestUpdatePrimaryForDataset (0.00s)
 === RUN   TestInterfaceIsImplemented
 --- PASS: TestInterfaceIsImplemented (0.00s)
 PASS
-ok  	github.com/ClusterHQ/flocker-go	0.084s
+ok  	github.com/ClusterHQ/flocker-go	0.009s
    create-stamp debian/debhelper-build-stamp
    dh_testroot -O--buildsystem=golang
    dh_prep -O--buildsystem=golang
@@ -559,12 +595,14 @@
 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/636467/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/636467/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/1049805 and its subdirectories
-I: Current time: Tue May 21 09:51:26 -12 2024
-I: pbuilder-time-stamp: 1716328286
+I: removing directory /srv/workspace/pbuilder/636467 and its subdirectories
+I: Current time: Tue Jun 24 18:15:28 +14 2025
+I: pbuilder-time-stamp: 1750738528