Diff of the two buildlogs:

--
--- b1/build.log	2020-03-06 20:27:41.701473859 +0000
+++ b2/build.log	2020-03-06 20:28:15.780816724 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Fri Mar  6 08:21:06 -12 2020
-I: pbuilder-time-stamp: 1583526066
+I: Current time: Fri Apr  9 16:50:42 +14 2021
+I: pbuilder-time-stamp: 1617936642
 I: Building the build Environment
 I: extracting base tarball [/var/cache/pbuilder/buster-reproducible-base.tgz]
 I: copying local configuration
@@ -18,7 +18,7 @@
 I: Extracting source
 gpgv: unknown type of key resource 'trustedkeys.kbx'
 gpgv: keyblock resource '/root/.gnupg/trustedkeys.kbx': General error
-gpgv: Signature made Tue Nov 20 07:47:16 2018 -12
+gpgv: Signature made Wed Nov 21 09:47:16 2018 +14
 gpgv:                using RSA key 0740778A2DFC4A39C0C8BC8C8F2B113C6535C5A7
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./golang-github-nats-io-go-nats_1.6.0+git20181112.9089d12-1.dsc
@@ -27,6 +27,18 @@
 dpkg-source: info: unpacking golang-github-nats-io-go-nats_1.6.0+git20181112.9089d12-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/29360/tmp/hooks/D01_modify_environment starting
+disorder-fs debug: Running on profitbricks-build6-i386.
+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
+Removing 'diversion of /bin/sh to /bin/sh.distrib by dash'
+Adding 'diversion of /bin/sh to /bin/sh.distrib by bash'
+Removing 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by dash'
+Adding 'diversion of /usr/share/man/man1/sh.1.gz to /usr/share/man/man1/sh.distrib.1.gz by 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/29360/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -127,7 +139,7 @@
 Get: 53 http://deb.debian.org/debian buster/main i386 libprotoc17 i386 3.6.1.3-2 [714 kB]
 Get: 54 http://deb.debian.org/debian buster/main i386 protobuf-compiler i386 3.6.1.3-2 [65.2 kB]
 Get: 55 http://deb.debian.org/debian buster/main i386 golang-goprotobuf-dev i386 1.2.0-1+b10 [1798 kB]
-Fetched 86.4 MB in 28s (3105 kB/s)
+Fetched 86.4 MB in 1s (84.1 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
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(Reading database ... 19231 files and directories currently installed.)
@@ -370,7 +382,7 @@
 fakeroot is already the newest version (1.23-1).
 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
 I: Building the package
-I: Running cd /build/golang-github-nats-io-go-nats-1.6.0+git20181112.9089d12/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games" HOME="/nonexistent/first-build" dpkg-buildpackage -us -uc -b
+I: Running cd /build/golang-github-nats-io-go-nats-1.6.0+git20181112.9089d12/ && env PATH="/usr/sbin:/usr/bin:/sbin:/bin:/usr/games:/i/capture/the/path" HOME="/nonexistent/second-build" dpkg-buildpackage -us -uc -b
 dpkg-buildpackage: info: source package golang-github-nats-io-go-nats
 dpkg-buildpackage: info: source version 1.6.0+git20181112.9089d12-1
 dpkg-buildpackage: info: source distribution unstable
@@ -388,78 +400,78 @@
    dh_autoreconf -O--buildsystem=golang
    dh_auto_configure -O--buildsystem=golang
    dh_auto_build -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-nats-io-go-nats-1.6.0\+git20181112.9089d12/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-nats-io-go-nats-1.6.0\+git20181112.9089d12/obj-i686-linux-gnu/src\" -v -p 10 github.com/nats-io/go-nats github.com/nats-io/go-nats/bench github.com/nats-io/go-nats/encoders/builtin github.com/nats-io/go-nats/encoders/protobuf github.com/nats-io/go-nats/test github.com/nats-io/go-nats/util
-errors
-math/bits
-unicode
+	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-nats-io-go-nats-1.6.0\+git20181112.9089d12/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-nats-io-go-nats-1.6.0\+git20181112.9089d12/obj-i686-linux-gnu/src\" -v -p 18 github.com/nats-io/go-nats github.com/nats-io/go-nats/bench github.com/nats-io/go-nats/encoders/builtin github.com/nats-io/go-nats/encoders/protobuf github.com/nats-io/go-nats/test github.com/nats-io/go-nats/util
+unicode/utf16
 internal/race
-runtime/internal/atomic
-internal/cpu
-runtime/internal/sys
-unicode/utf8
-sync/atomic
-container/list
-crypto/internal/subtle
-math
 crypto/subtle
 vendor/golang_org/x/crypto/cryptobyte/asn1
+math/bits
+errors
+crypto/internal/subtle
+unicode/utf8
+container/list
+runtime/internal/atomic
+encoding
 internal/nettrace
+runtime/internal/sys
+unicode
+runtime/cgo
+sync/atomic
+internal/cpu
 vendor/golang_org/x/net/dns/dnsmessage
-internal/bytealg
-encoding
-unicode/utf16
 internal/testlog
-runtime/cgo
+math
+internal/bytealg
 runtime
 strconv
 crypto/rc4
 sync
-io
 internal/singleflight
+io
 math/rand
 reflect
 syscall
 hash
+bytes
 crypto/internal/randutil
-strings
 crypto/cipher
-bytes
+strings
 crypto
 crypto/hmac
 crypto/sha512
 crypto/md5
-crypto/sha1
 crypto/sha256
+crypto/sha1
 crypto/aes
 bufio
 encoding/base32
 internal/syscall/unix
 time
 internal/poll
-sort
 encoding/binary
+sort
 os
+vendor/golang_org/x/crypto/internal/chacha20
 encoding/base64
-vendor/golang_org/x/crypto/poly1305
 crypto/des
-vendor/golang_org/x/crypto/internal/chacha20
-golang.org/x/crypto/ed25519/internal/edwards25519
+vendor/golang_org/x/crypto/poly1305
 vendor/golang_org/x/crypto/curve25519
+golang.org/x/crypto/ed25519/internal/edwards25519
 vendor/golang_org/x/crypto/chacha20poly1305
 encoding/pem
 runtime/debug
 path/filepath
 fmt
 io/ioutil
-log
-encoding/csv
 context
+encoding/csv
+log
 net/url
 encoding/hex
 flag
-math/big
 encoding/gob
 encoding/json
+math/big
 runtime/trace
 net
 testing
@@ -470,13 +482,13 @@
 crypto/rand
 encoding/asn1
 crypto/elliptic
-golang.org/x/crypto/ed25519
 github.com/nats-io/nuid
+golang.org/x/crypto/ed25519
 crypto/rsa
 github.com/nats-io/nkeys
-crypto/ecdsa
-crypto/x509/pkix
 vendor/golang_org/x/crypto/cryptobyte
+crypto/x509/pkix
+crypto/ecdsa
 crypto/x509
 crypto/tls
 github.com/nats-io/go-nats/util
@@ -514,12 +526,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/29360/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/29360/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/28520 and its subdirectories
-I: Current time: Fri Mar  6 08:27:41 -12 2020
-I: pbuilder-time-stamp: 1583526461
+I: removing directory /srv/workspace/pbuilder/29360 and its subdirectories
+I: Current time: Fri Apr  9 16:51:14 +14 2021
+I: pbuilder-time-stamp: 1617936674