bug#20037: 'guix system reconfigure' without 'gnu/system/linux.go' fails with duplicates login pam-service

[宋文武 <iyzsong@gmail.com>]

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I can reproduce the issue Tomáš Čech (Sleep_Walker) reported at IRC,
but only when reconfigure under 'pre-inst-env' and without 'gnu/system/linux.go':

$ cd guix; make clean-go
# .../guix/pre-inst-env guix system reconfigure config.scm

;;; Failed to autoload make-session in (gnutls):
;;; ERROR: missing interface for module (gnutls)
;;; Failed to autoload connection-end/client in (gnutls):
;;; ERROR: missing interface for module (gnutls)
;;; Failed to autoload make-session in (gnutls):
;;; ERROR: missing interface for module (gnutls)
The following derivations will be built:
   /gnu/store/8576w1km2a8ij7k66k6n37gyhxzpxda4-system.drv
   /gnu/store/8jg5iqrd04hj1k8nx6fzcm9lz16nmk4r-grub.cfg.drv
   /gnu/store/d53lbndj9yryrzgb3p4vjlb9gyh1rri0-activate.drv
   /gnu/store/y3i8spghyv4dg8d8yl78bvkjb3xcbarb-boot.drv
   /gnu/store/mrlw80nawfbc8mhq3pz6gbxxpgjbabij-pam.d.drv
   /gnu/store/sf3n6ijagmc64ik7mn96p8c69xk30nmv-etc.drv
Backtrace:
In ice-9/boot-9.scm:
 157: 10 [catch #t #<catch-closure e365c0> ...]
In unknown file:
   ?: 9 [apply-smob/1 #<catch-closure e365c0>]
In ice-9/boot-9.scm:
  63: 8 [call-with-prompt prompt0 ...]
In ice-9/eval.scm:
 432: 7 [eval # #]
In ice-9/boot-9.scm:
2401: 6 [save-module-excursion #<procedure e53980 at ice-9/boot-9.scm:4045:3 ()>]
4050: 5 [#<procedure e53980 at ice-9/boot-9.scm:4045:3 ()>]
1724: 4 [%start-stack load-stack #<procedure e66ae0 at ice-9/boot-9.scm:4041:10 ()>]
1729: 3 [#<procedure e6af00 ()>]
In unknown file:
   ?: 2 [primitive-load "/gnu/store/dmsgr6bsp9k0x7c2dmcvhqrgrqqal7kb-pam.d-builder"]
In ice-9/boot-9.scm:
 775: 1 [for-each #<procedure eec7e0 at ice-9/eval.scm:416:20 (a)> (# # # # ...)]
In unknown file:
   ?: 0 [symlink "/gnu/store/pn2wmdczwcknksxhdn4jl6sh49h0vidm-login" ...]

ERROR: In procedure symlink:
ERROR: In procedure symlink: File exists
builder for `/gnu/store/mrlw80nawfbc8mhq3pz6gbxxpgjbabij-pam.d.drv' failed with exit code 1
cannot build derivation `/gnu/store/sf3n6ijagmc64ik7mn96p8c69xk30nmv-etc.drv': 1 dependencies couldn't be built
cannot build derivation `/gnu/store/8576w1km2a8ij7k66k6n37gyhxzpxda4-system.drv': 1 dependencies couldn't be built
killing process 2317
guix system: error: build failed: build of `/gnu/store/8576w1km2a8ij7k66k6n37gyhxzpxda4-system.drv' failed


the pam.d-builder contains duplicates login entries
(I have 3 mingetty-service)

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(begin (use-modules (ice-9 match)) (mkdir ((@ (guile) getenv) "out")) (for-each (match-lambda ((name file) (symlink file (string-append ((@ (guile) getenv) "out") "/" name)))) (quote (("other" "/gnu/store/cr80d2l4qq7d16f9p7w6w8ll1vfnq6w0-other") ("su" "/gnu/store/ja108kxwjxdm9nfkcpjh4d19wyfpqz6p-su") ("passwd" "/gnu/store/gc3cgf42a9zb1lwn0fgjhlba0d6jz376-passwd") ("sudo" "/gnu/store/9dl3npnipnh22ggn8dc3z3b1d9fc2gy5-sudo") ("xlock" "/gnu/store/0pmvrvhj8af5gp3jp9vyy0zqdk8lh3ki-xlock") ("xscreensaver" "/gnu/store/a0fdzjxs3fq6gghi4ig63zcy2qay2ar4-xscreensaver") ("useradd" "/gnu/store/w4v4c4ha8h6ycxh4bkyr8siqns8lnv21-useradd") ("userdel" "/gnu/store/190wssinpswngihm1hn04nkd9487y1v3-userdel") ("usermod" "/gnu/store/13lmzlq3qzx220ngawvw1gfy15nws3z0-usermod") ("groupadd" "/gnu/store/3vy2rwfajsvaipxq1zfz32krbwnskk59-groupadd") ("groupdel" "/gnu/store/dpggh2fyrfplw2hr8d3ff3808c0gbzb8-groupdel") ("groupmod" "/gnu/store/5wd5dx25xrn4n3n358ik2iqhhz1jlpv4-groupmod") ("login" "/gnu/store/pn2wmdczwcknksxhdn4jl6sh49h0vidm-login") ("login" "/gnu/store/pn2wmdczwcknksxhdn4jl6sh49h0vidm-login") ("login" "/gnu/store/pn2wmdczwcknksxhdn4jl6sh49h0vidm-login") ("slim" "/gnu/store/g3yhrx6ryvqhy292hbkfkrsd83ylclic-slim")))))

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After add '(pretty-print services)' to 'pam-services->directory', I get:

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(#<<pam-service> name: "other" account: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>)>
 #<<pam-service> name: "su" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "passwd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "sudo" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xlock" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xscreensaver" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "useradd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "userdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "usermod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupadd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupmod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 36ebd50>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 36ed210>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 36f63c0>)>)>
 #<<pam-service> name: "slim" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>)
(#<<pam-service> name: "other" account: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>)>
 #<<pam-service> name: "su" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "passwd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "sudo" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xlock" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xscreensaver" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "useradd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "userdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "usermod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupadd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupmod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 3dff4b0>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 3e10ea0>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 3e15900>)>)>
 #<<pam-service> name: "slim" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>)
(#<<pam-service> name: "other" account: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>)>
 #<<pam-service> name: "su" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "passwd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "sudo" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xlock" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xscreensaver" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "useradd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "userdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "usermod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupadd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupmod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) a1f6900>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) a1f9120>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) a22bae0>)>)>
 #<<pam-service> name: "slim" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>)
(#<<pam-service> name: "other" account: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_deny.so" arguments: ()>)>
 #<<pam-service> name: "su" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "passwd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "sudo" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xlock" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "xscreensaver" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "useradd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "userdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "usermod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupadd" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupdel" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "groupmod" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "sufficient" module: "pam_rootok.so" arguments: ()>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 6a1e540>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 6a25bd0>)>)>
 #<<pam-service> name: "login" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()> #<<pam-entry> control: "optional" module: "pam_motd.so" arguments: (#<gexp (string-append "motd=" ("/gnu/store/svnsdsv082fq492p291pww7c7cv1qdms-motd")) 6a284b0>)>)>
 #<<pam-service> name: "slim" account: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) auth: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ("nullok")>) password: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>) session: (#<<pam-entry> control: "required" module: "pam_unix.so" arguments: ()>)>)

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After 'make gnu/system/linux.go', it works with a different pam.d-builder:

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(begin (use-modules (ice-9 match)) (mkdir ((@ (guile) getenv) "out")) (for-each (match-lambda ((name file) (symlink file (string-append ((@ (guile) getenv) "out") "/" name)))) (quote (("other" "/gnu/store/cr80d2l4qq7d16f9p7w6w8ll1vfnq6w0-other") ("su" "/gnu/store/ja108kxwjxdm9nfkcpjh4d19wyfpqz6p-su") ("passwd" "/gnu/store/gc3cgf42a9zb1lwn0fgjhlba0d6jz376-passwd") ("sudo" "/gnu/store/9dl3npnipnh22ggn8dc3z3b1d9fc2gy5-sudo") ("xlock" "/gnu/store/0pmvrvhj8af5gp3jp9vyy0zqdk8lh3ki-xlock") ("xscreensaver" "/gnu/store/a0fdzjxs3fq6gghi4ig63zcy2qay2ar4-xscreensaver") ("useradd" "/gnu/store/w4v4c4ha8h6ycxh4bkyr8siqns8lnv21-useradd") ("userdel" "/gnu/store/190wssinpswngihm1hn04nkd9487y1v3-userdel") ("usermod" "/gnu/store/13lmzlq3qzx220ngawvw1gfy15nws3z0-usermod") ("groupadd" "/gnu/store/3vy2rwfajsvaipxq1zfz32krbwnskk59-groupadd") ("groupdel" "/gnu/store/dpggh2fyrfplw2hr8d3ff3808c0gbzb8-groupdel") ("groupmod" "/gnu/store/5wd5dx25xrn4n3n358ik2iqhhz1jlpv4-groupmod") ("login" "/gnu/store/pn2wmdczwcknksxhdn4jl6sh49h0vidm-login") ("slim" "/gnu/store/g3yhrx6ryvqhy292hbkfkrsd83ylclic-slim")))))