Diff of the two buildlogs:

--
--- b1/build.log	2020-04-01 23:47:53.942671638 +0000
+++ b2/build.log	2020-04-01 23:48:29.417978942 +0000
@@ -1,6 +1,6 @@
 I: pbuilder: network access will be disabled during build
-I: Current time: Wed Apr  1 11:40:28 -12 2020
-I: pbuilder-time-stamp: 1585784428
+I: Current time: Wed May  5 20:10:55 +14 2021
+I: pbuilder-time-stamp: 1620195055
 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 Thu Mar  9 10:32:19 2017 -12
+gpgv: Signature made Fri Mar 10 12:32:19 2017 +14
 gpgv:                using RSA key B24CA63F6EBBE84D
 gpgv: Can't check signature: No public key
 dpkg-source: warning: failed to verify signature on ./golang-github-go-openapi-strfmt_0.0~git20160812.0.d65c7fd-1.dsc
@@ -27,6 +27,18 @@
 dpkg-source: info: unpacking golang-github-go-openapi-strfmt_0.0~git20160812.0.d65c7fd-1.debian.tar.xz
 I: using fakeroot in build.
 I: Installing the build-deps
+I: user script /srv/workspace/pbuilder/18601/tmp/hooks/D01_modify_environment starting
+disorder-fs debug: Running on profitbricks-build16-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/18601/tmp/hooks/D01_modify_environment finished
  -> Attempting to satisfy build-dependencies
  -> Creating pbuilder-satisfydepends-dummy package
 Package: pbuilder-satisfydepends-dummy
@@ -123,7 +135,7 @@
 Get: 45 http://deb.debian.org/debian buster/main i386 golang-github-go-openapi-errors-dev all 0.0~git20160704.0.d24ebc2-1 [7344 B]
 Get: 46 http://deb.debian.org/debian buster/main i386 golang-github-mailru-easyjson-dev all 0.0~git20161103.0.159cdb8-1.1 [63.2 kB]
 Get: 47 http://deb.debian.org/debian buster/main i386 golang-github-pborman-uuid-dev all 1.1-1 [13.6 kB]
-Fetched 74.5 MB in 1min 37s (768 kB/s)
+Fetched 74.5 MB in 1s (81.8 MB/s)
 debconf: delaying package configuration, since apt-utils is not installed
 Selecting previously unselected package libbsd0:i386.
 (Reading database ... 
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(Reading database ... 19231 files and directories currently installed.)
@@ -334,7 +346,7 @@
 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-go-openapi-strfmt-0.0~git20160812.0.d65c7fd/ && 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-go-openapi-strfmt-0.0~git20160812.0.d65c7fd/ && 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-go-openapi-strfmt
 dpkg-buildpackage: info: source version 0.0~git20160812.0.d65c7fd-1
 dpkg-buildpackage: info: source distribution unstable
@@ -352,48 +364,48 @@
    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-go-openapi-strfmt-0.0\~git20160812.0.d65c7fd/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-go-openapi-strfmt-0.0\~git20160812.0.d65c7fd/obj-i686-linux-gnu/src\" -v -p 10 github.com/go-openapi/strfmt
+	cd obj-i686-linux-gnu && go install -gcflags=all=\"-trimpath=/build/golang-github-go-openapi-strfmt-0.0\~git20160812.0.d65c7fd/obj-i686-linux-gnu/src\" -asmflags=all=\"-trimpath=/build/golang-github-go-openapi-strfmt-0.0\~git20160812.0.d65c7fd/obj-i686-linux-gnu/src\" -v -p 18 github.com/go-openapi/strfmt
+errors
+unicode/utf16
 internal/race
-math/bits
 unicode/utf8
+vendor/golang_org/x/crypto/cryptobyte/asn1
+internal/nettrace
+internal/cpu
 unicode
 sync/atomic
-internal/cpu
-errors
-runtime/internal/atomic
 runtime/internal/sys
-math
-encoding
 crypto/internal/subtle
-crypto/subtle
-internal/testlog
-vendor/golang_org/x/crypto/cryptobyte/asn1
-internal/nettrace
+math/bits
+runtime/internal/atomic
 vendor/golang_org/x/net/dns/dnsmessage
-unicode/utf16
-internal/bytealg
 container/list
+encoding
+crypto/subtle
+internal/testlog
 runtime/cgo
+math
+internal/bytealg
 runtime
 strconv
 crypto/rc4
 sync
 io
-internal/singleflight
 math/rand
+internal/singleflight
 reflect
 syscall
 hash
 crypto/internal/randutil
-crypto/cipher
 github.com/mailru/easyjson/buffer
 bytes
-crypto
+crypto/cipher
 strings
-hash/crc32
+crypto
 crypto/hmac
-crypto/sha512
+hash/crc32
 crypto/md5
+crypto/sha512
 crypto/sha1
 crypto/sha256
 crypto/aes
@@ -404,49 +416,49 @@
 internal/syscall/unix
 time
 internal/poll
-os
-sort
 encoding/binary
-fmt
-path/filepath
+sort
+os
 regexp/syntax
-io/ioutil
-encoding/base64
-crypto/des
 vendor/golang_org/x/crypto/poly1305
+encoding/base64
 vendor/golang_org/x/crypto/internal/chacha20
+crypto/des
 vendor/golang_org/x/crypto/curve25519
-encoding/pem
 vendor/golang_org/x/crypto/chacha20poly1305
+encoding/pem
 github.com/mailru/easyjson/jwriter
+path/filepath
+fmt
+io/ioutil
+regexp
 context
 encoding/hex
-log
 net/url
-math/big
-encoding/json
-vendor/golang_org/x/net/http2/hpack
+log
 compress/flate
-vendor/golang_org/x/text/unicode/norm
-regexp
-mime
-vendor/golang_org/x/text/unicode/bidi
-database/sql/driver
-net
+vendor/golang_org/x/net/http2/hpack
 mime/quotedprintable
+encoding/json
+mime
 net/http/internal
-vendor/golang_org/x/text/secure/bidirule
 github.com/mailru/easyjson/jlexer
+math/big
+vendor/golang_org/x/text/unicode/norm
+database/sql/driver
+vendor/golang_org/x/text/unicode/bidi
+net
 compress/gzip
+vendor/golang_org/x/text/secure/bidirule
 vendor/golang_org/x/net/idna
-crypto/rand
 crypto/dsa
+crypto/rand
 crypto/elliptic
 encoding/asn1
 crypto/rsa
+crypto/ecdsa
 crypto/x509/pkix
 vendor/golang_org/x/crypto/cryptobyte
-crypto/ecdsa
 vendor/golang_org/x/net/http/httpproxy
 net/textproto
 crypto/x509
@@ -459,7 +471,7 @@
 github.com/go-openapi/errors
 github.com/go-openapi/strfmt
    dh_auto_test -O--buildsystem=golang
-	cd obj-i686-linux-gnu && go test -vet=off -v -p 10 github.com/go-openapi/strfmt
+	cd obj-i686-linux-gnu && go test -vet=off -v -p 18 github.com/go-openapi/strfmt
 === RUN   TestDate
 --- PASS: TestDate (0.00s)
 === RUN   TestDate_Scan
@@ -565,7 +577,7 @@
     time_test.go:131: Case #4
     time_test.go:131: Case #5
 PASS
-ok  	github.com/go-openapi/strfmt	0.025s
+ok  	github.com/go-openapi/strfmt	0.009s
    create-stamp debian/debhelper-build-stamp
  fakeroot debian/rules binary
 dh binary --buildsystem=golang --with=golang
@@ -596,12 +608,14 @@
  dpkg-source --after-build .
 dpkg-buildpackage: info: binary-only upload (no source included)
 I: copying local configuration
+I: user script /srv/workspace/pbuilder/18601/tmp/hooks/B01_cleanup starting
+I: user script /srv/workspace/pbuilder/18601/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/8082 and its subdirectories
-I: Current time: Wed Apr  1 11:47:53 -12 2020
-I: pbuilder-time-stamp: 1585784873
+I: removing directory /srv/workspace/pbuilder/18601 and its subdirectories
+I: Current time: Wed May  5 20:11:28 +14 2021
+I: pbuilder-time-stamp: 1620195088