Diff of the two buildlogs:

--
--- b1/build.log	2024-05-20 08:23:00.748832207 +0000
+++ b2/build.log	2024-05-20 08:28:27.270937107 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Sun Jun 22 02:44:53 -12 2025
-I: pbuilder-time-stamp: 1750603493
+I: Current time: Mon May 20 22:23:03 +14 2024
+I: pbuilder-time-stamp: 1716193383
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/unstable-reproducible-base.tgz]
 I: copying local configuration
@@ -25,52 +25,84 @@
 dpkg-source: info: unpacking golang-github-masterminds-vcs-dev_1.12.0-4.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
-I: user script /srv/workspace/pbuilder/1461215/tmp/hooks/D02_print_environment starting
+I: user script /srv/workspace/pbuilder/294340/tmp/hooks/D01_modify_environment starting
+debug: Running on ionos11-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 20 08:23 /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/294340/tmp/hooks/D01_modify_environment finished
+I: user script /srv/workspace/pbuilder/294340/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='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=20 '
+  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='1cb9310cafe240fab65d11410f500d84'
-  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='1461215'
-  PS1='# '
-  PS2='> '
+  INVOCATION_ID=5396cbe626e2446e8f8d487b3317bb6f
+  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=294340
   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.gimAKII6/pbuilderrc_5BOk --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.gimAKII6/b1 --logfile b1/build.log golang-github-masterminds-vcs-dev_1.12.0-4.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.gimAKII6/pbuilderrc_AK6m --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.gimAKII6/b2 --logfile b2/build.log golang-github-masterminds-vcs-dev_1.12.0-4.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://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 21 14:05 /bin -> usr/bin
-I: user script /srv/workspace/pbuilder/1461215/tmp/hooks/D02_print_environment finished
+  lrwxrwxrwx 1 root root 7 May 19 07:43 /bin -> usr/bin
+I: user script /srv/workspace/pbuilder/294340/tmp/hooks/D02_print_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -212,7 +244,7 @@
 Get: 92 http://deb.debian.org/debian unstable/main amd64 mercurial-common all 6.7.3-1 [2837 kB]
 Get: 93 http://deb.debian.org/debian unstable/main amd64 mercurial amd64 6.7.3-1 [382 kB]
 Get: 94 http://deb.debian.org/debian unstable/main amd64 subversion amd64 1.14.3-1+b4 [960 kB]
-Fetched 92.3 MB in 5s (19.2 MB/s)
+Fetched 92.3 MB in 4s (26.0 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libpython3.11-minimal:amd64.
 (Reading database ... 
(Reading database ... 5%
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(Reading database ... 80%
(Reading database ... 85%
(Reading database ... 90%
(Reading database ... 95%
(Reading database ... 100%
(Reading database ... 19718 files and directories currently installed.)
@@ -533,8 +565,8 @@
 Setting up tzdata (2024a-4) ...
 
 Current default time zone: 'Etc/UTC'
-Local time is now:      Sun Jun 22 14:45:28 UTC 2025.
-Universal Time is now:  Sun Jun 22 14:45:28 UTC 2025.
+Local time is now:      Mon May 20 08:25:35 UTC 2024.
+Universal Time is now:  Mon May 20 08:25:35 UTC 2024.
 Run 'dpkg-reconfigure tzdata' if you wish to change it.
 
 Setting up liberror-perl (0.17029-2) ...
@@ -624,7 +656,11 @@
 fakeroot is already the newest version (1.34-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/reproducible-path/golang-github-masterminds-vcs-dev-1.12.0/ && 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  > ../golang-github-masterminds-vcs-dev_1.12.0-4_source.changes
+I: user script /srv/workspace/pbuilder/294340/tmp/hooks/A99_set_merged_usr starting
+Not re-configuring usrmerge for unstable
+I: user script /srv/workspace/pbuilder/294340/tmp/hooks/A99_set_merged_usr finished
+hostname: Name or service not known
+I: Running cd /build/reproducible-path/golang-github-masterminds-vcs-dev-1.12.0/ && 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  > ../golang-github-masterminds-vcs-dev_1.12.0-4_source.changes
 dpkg-buildpackage: info: source package golang-github-masterminds-vcs-dev
 dpkg-buildpackage: info: source version 1.12.0-4
 dpkg-buildpackage: info: source distribution unstable
@@ -642,37 +678,37 @@
    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 42 github.com/Masterminds/vcs
-math/bits
+	cd obj-x86_64-linux-gnu && go install -trimpath -v -p 20 github.com/Masterminds/vcs
 container/list
-log/internal
-internal/itoa
 internal/unsafeheader
-encoding
-vendor/golang.org/x/crypto/internal/alias
-vendor/golang.org/x/crypto/cryptobyte/asn1
-internal/goos
 internal/godebugs
+internal/goarch
+internal/goos
 internal/race
-internal/coverage/rtcov
-internal/nettrace
-crypto/internal/boring/sig
-cmp
+math/bits
+unicode
+encoding
 sync/atomic
-runtime/internal/syscall
-crypto/internal/alias
-internal/cpu
-internal/goarch
 unicode/utf8
-crypto/subtle
+internal/cpu
 runtime/internal/atomic
+internal/coverage/rtcov
+runtime/internal/syscall
+internal/chacha8rand
+internal/itoa
+internal/abi
 internal/goexperiment
-unicode/utf16
-unicode
 runtime/internal/math
-internal/chacha8rand
 runtime/internal/sys
-internal/abi
+crypto/internal/alias
+log/internal
+unicode/utf16
+crypto/subtle
+crypto/internal/boring/sig
+vendor/golang.org/x/crypto/cryptobyte/asn1
+cmp
+internal/nettrace
+vendor/golang.org/x/crypto/internal/alias
 slices
 internal/bytealg
 math
@@ -680,97 +716,97 @@
 internal/reflectlite
 sync
 internal/testlog
-internal/singleflight
 internal/bisect
+internal/singleflight
 runtime/cgo
+internal/godebug
 errors
 internal/oserror
 internal/safefilepath
-internal/godebug
-path
-sort
 io
-strconv
 vendor/golang.org/x/net/dns/dnsmessage
-crypto/internal/nistec/fiat
 internal/intern
+sort
+path
 math/rand
-syscall
+strconv
+crypto/internal/nistec/fiat
 hash
 crypto/internal/randutil
 bytes
 strings
-hash/crc32
-crypto/rc4
-crypto
 net/netip
+crypto/rc4
 reflect
-vendor/golang.org/x/text/transform
+syscall
+crypto
+hash/crc32
 net/http/internal/ascii
-bufio
 regexp/syntax
+bufio
+vendor/golang.org/x/text/transform
 regexp
-internal/syscall/execenv
 internal/syscall/unix
+internal/syscall/execenv
 time
 internal/fmtsort
 encoding/binary
-context
-io/fs
-internal/poll
+crypto/cipher
+crypto/internal/edwards25519/field
 encoding/base64
 crypto/md5
-crypto/cipher
 vendor/golang.org/x/crypto/internal/poly1305
-crypto/internal/edwards25519/field
-embed
 encoding/pem
-crypto/internal/nistec
-crypto/internal/edwards25519
 crypto/internal/boring
 crypto/des
 vendor/golang.org/x/crypto/chacha20
-os
+crypto/aes
+crypto/sha512
 crypto/hmac
+crypto/internal/edwards25519
 crypto/sha1
-crypto/sha512
 crypto/sha256
-crypto/aes
+io/fs
+internal/poll
+context
 vendor/golang.org/x/crypto/hkdf
+embed
+crypto/internal/nistec
+os
 crypto/ecdh
 io/ioutil
 path/filepath
 fmt
 vendor/golang.org/x/sys/cpu
 net
-vendor/golang.org/x/crypto/chacha20poly1305
 os/exec
 log
-encoding/hex
-mime/quotedprintable
-net/url
-net/http/internal
+encoding/xml
 compress/flate
+encoding/json
+encoding/hex
 vendor/golang.org/x/net/http2/hpack
+mime/quotedprintable
 mime
-encoding/json
-encoding/xml
-math/big
+net/http/internal
 vendor/golang.org/x/text/unicode/norm
+net/url
+math/big
+vendor/golang.org/x/crypto/chacha20poly1305
 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/rand
 crypto/dsa
 crypto/internal/boring/bbig
-crypto/rand
-crypto/elliptic
-crypto/internal/bigmod
 encoding/asn1
+crypto/internal/bigmod
 crypto/ed25519
-crypto/rsa
-crypto/x509/pkix
 vendor/golang.org/x/crypto/cryptobyte
+crypto/x509/pkix
+crypto/rsa
 crypto/ecdsa
 vendor/golang.org/x/net/http/httpproxy
 net/textproto
@@ -817,12 +853,14 @@
 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/294340/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/294340/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/1461215 and its subdirectories
-I: Current time: Sun Jun 22 02:45:58 -12 2025
-I: pbuilder-time-stamp: 1750603558
+I: removing directory /srv/workspace/pbuilder/294340 and its subdirectories
+I: Current time: Mon May 20 22:28:26 +14 2024
+I: pbuilder-time-stamp: 1716193706