+ set -e
+ guix environment --version
warning: daemon is running as root, so using `--build-users-group' is highly recommended
guix environment (GNU Guix) 0.9.0
Copyright (C) 2015 the Guix authors
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.
+ tmpdir=t-guix-environment-9613
+ trap 'rm -r "$tmpdir"' EXIT
+ mkdir t-guix-environment-9613
+ guix environment --container --ad-hoc --bootstrap guile-bootstrap -- guile -c '(exit 42)'
accepted connection from pid 9621, user root (trusted)
+ test 42 = 42
+ mount_test_code='
(use-modules (ice-9 rdelim)
             (ice-9 match)
             (srfi srfi-1))

(define mappings
  (filter-map (lambda (line)
                (match (string-split line #\space)
                  ;; Empty line.
                  (("") #f)
                  ;; Ignore these types of file systems.
                  ((_ _ (or "tmpfs" "proc" "sysfs" "devtmpfs"
                            "devpts" "cgroup" "mqueue") _ _ _)
                   #f)
                  ((_ mount _ _ _ _)
                   mount)))
              (string-split (call-with-input-file "/proc/mounts" read-string)
                            #\newline)))

(for-each (lambda (mount)
            (display mount)
            (newline))
          mappings)'
+ guix environment --container --ad-hoc --bootstrap guile-bootstrap -- guile -c '
(use-modules (ice-9 rdelim)
             (ice-9 match)
             (srfi srfi-1))

(define mappings
  (filter-map (lambda (line)
                (match (string-split line #\space)
                  ;; Empty line.
                  (("") #f)
                  ;; Ignore these types of file systems.
                  ((_ _ (or "tmpfs" "proc" "sysfs" "devtmpfs"
                            "devpts" "cgroup" "mqueue") _ _ _)
                   #f)
                  ((_ mount _ _ _ _)
                   mount)))
              (string-split (call-with-input-file "/proc/mounts" read-string)
                            #\newline)))

(for-each (lambda (mount)
            (display mount)
            (newline))
          mappings)'
accepted connection from pid 9627, user root (trusted)
++ wc -l
+ test 4 -eq 3
+ rm -r t-guix-environment-9613