… and then run your test. It shows this: --8<---------------cut here---------------start------------->8--- […] adding user 'guixbuilder09'... adding user 'guixbuilder10'... adding user 'mysql'... registering public key '/gnu/store/zh0lb2g15hirq7zw2477w7s5ww7dxkv0-guix-0.13.0-6.a9468b4/share/guix/hydra.gnu.org.pub'... ;;; (("/gnu/store/dsbc8lh9zav2ghb7gi1zm608igbgg1jv-module-import" "/gnu/store/dsbc8lh9zav2ghb7gi1zm608igbgg1jv-module-import" "/gnu/store/m843zdvsv2p3glz91y8icv3qwkr9mnzs-module-import" "/gnu/store/m843zdvsv2p3glz91y8icv3qwkr9mnzs-module-import" "/gnu/store/dr6706rm053d9b6h4rhi29l2ipxcd9jf-module-import" "/gnu/store/dr6706rm053d9b6h4rhi29l2ipxcd9jf-module-import" "/gnu/store/9whwwppmb2sjfsy0967s627bzgdfl8bc-guile-static-stripped-2.2.2/share/guile/2.2") #f) ;;; ("/gnu/store/9whwwppmb2sjfsy0967s627bzgdfl8bc-guile-static-stripped-2.2.2/share/guile/2.2" exits? #f) ;;; (popen #f) ;;; (scan ("." ".." 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"zb5gqhaj2sb1gy6imgsnhvxxcbzljg90-shepherd-file-system--sys-fs-cgroup-cpuacct.scm" "zh0lb2g15hirq7zw2477w7s5ww7dxkv0-guix-0.13.0-6.a9468b4" "zhhdii9mjckb6c2f7abmdsx39khv6dla-tar-1.29" "zhrajv6qf2hzn9c3g2bb07559hyrz5xp-bash-static-4.4.12" "zikv0zk3y5q2qx65r1xjxawm3ha97zdk-shells" "zs6zn16qbm53f1dda75ywl2gsd7m4xbn-activate-service" "zspi375jsb1076khqr3bbf5pg0vfgj65-shepherd-host-name.scm" "zvakcs6x3zzlx95wypz9dl3k908bc6lc-shepherd-file-system--sys-fs-cgroup-cpuset.scm" "zwhrh2429r7y13nd3bnfihswxdflb4ih-curl-7.55.0" "zwvgwl1yjfbh5k1255jvia6q331ib3m1-pam.d" "zxm6qadad3vc7asy1q0xp9dld012kxgk-90-kvm.rules" "zyya6pd6hg2zvcbqpzavqjv4wagms03c-module-import-compiled" "zzaxsv4jp0k9nhbvxm2al5c8b6l6nxyv-modprobe")) ERROR: In procedure scm-error: ERROR: no code for module (ice-9 popen) --8<---------------cut here---------------end--------------->8--- As you can see, /gnu/store/9whwwppmb2sjfsy0967s627bzgdfl8bc-guile-static-stripped-2.2.2/share/guile/2.2, which is at the tail of %load-path, is missing from the root file system, hence the failure. To work around it, we’d have to either ensure that ‘guile-static-stripped’ is on the root file system, or adjust the load path when we switch roots, or (simplest solution) pre-load (ice-9 popen) before ‘switch-root’. To be continued… Ludo’.