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diff --git a/zabbix.scm b/zabbix.scm
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+;; zabbix.scm --- Monitor Guix in Zabbix.
+;; Copyright © 2019 Oleg Pykhalov <go.wigust@gmail.com>
+;; Released under the GNU GPLv3 or any later version.
+
+(define-module (zabbix)
+  #:use-module (guix channels)
+  #:use-module (guix describe)
+  #:use-module (guix profiles)
+  #:use-module (ice-9 match)
+  #:use-module (ice-9 popen)
+  #:use-module (ice-9 rdelim)
+  #:use-module (json)
+  #:use-module (srfi srfi-1)
+  #:use-module (srfi srfi-37))
+
+(define (git . args)
+  "Execute 'git ARGS ...' command and return its output without trailing
+newspace."
+  (let* ((port   (apply open-pipe* OPEN_READ "git" args))
+         (output (read-string port)))
+    (close-port port)
+    (string-trim-right output #\newline)))
+
+(define (remote-channels channels)
+  (map (lambda (c)
+         (match (string-split (git "ls-remote" (channel-url c)
+                                   (string-append "*/" (channel-branch c)))
+                              #\tab)
+           ((commit ref)
+            (channel (name (channel-name c))
+                     (url (channel-url c))
+                     (commit commit)
+                     (branch (channel-branch c))
+                     (location #f)))))
+       (eval (begin (use-modules (guix channels))
+                    (with-input-from-file channels read))
+             (current-module))))
+
+(define (channels profile)
+  (define number
+    (generation-number profile))
+
+  (map (lambda (entry)
+         (match (assq 'source (manifest-entry-properties entry))
+           (('source ('repository ('version 0)
+                                  ('url url)
+                                  ('branch branch)
+                                  ('commit commit)
+                                  _ ...))
+            (channel (name (string->symbol (manifest-entry-name entry)))
+                     (url url)
+                     (commit commit)
+                     (location #f)))
+
+           ;; Pre-0.15.0 Guix does not provide that information,
+           ;; so there's not much we can do in that case.
+           (_ (channel (name 'guix)
+                       (url "?")
+                       (commit "?")))))
+
+       ;; Show most recently installed packages last.
+       (reverse
+        (manifest-entries
+         (profile-manifest
+          (if (zero? number)
+              profile
+              (generation-file-name profile number)))))))
+
+(define %options
+  (let ((display-and-exit-proc (lambda (msg)
+                                 (lambda (opt name arg loads)
+                                   (display msg) (quit)))))
+    (list (option '(#\v "version") #f #f
+                  (display-and-exit-proc "Guiz version 0.0.1\n"))
+          (option '(#\h "help") #f #f
+                  (display-and-exit-proc
+                   "Usage: foo scheme-file ..."))
+          (option '(#\A "available") #f #t
+                  (lambda (opt name arg loads)
+                    (cons `(query list-available ,(or arg ""))
+                          loads)))
+          (option '(#\d "diff") #t #f
+                  (lambda (opt name arg loads)
+                    (cons `(query diff ,(or arg ""))
+                          loads)))
+          (option '(#\p "profile") #t #f
+                  (lambda (opt name arg loads)
+                    (alist-cons 'profile (canonicalize-profile arg)
+                                loads)))
+          (option '(#\r "remote") #t #f
+                  (lambda (opt name arg loads)
+                    (alist-cons 'remote arg loads))))))
+
+(define %default-options
+  '())
+
+(define (main args)
+  (define opts
+    (args-fold (cdr (program-arguments))
+               %options
+               (lambda (opt name arg loads)
+                 (error "Unrecognized option `~A'" name))
+               (lambda (op loads)
+                 (cons op loads))
+               %default-options))
+
+  (define (find-channel-name name channels)
+    (fold (lambda (x xs)
+            (if (string=? (symbol->string (channel-name x)) name)
+                (cons x xs)
+                xs))
+          '()
+          channels))
+
+  (define remote (or (assq-ref opts 'remote)
+                     (string-append (getenv "HOME") "/.config/guix/channels.scm")))
+
+  (define profile (or (assq-ref opts 'profile) (current-profile)))
+
+  (match (assoc-ref opts 'query)
+    (('list-available name)
+     (scm->json
+      `((data ,@(map (lambda (local remote)
+                       `(("{#REMOTE_NAME}" . ,(channel-name remote))
+                         ("{#REMOTE_URL}" . ,(channel-url remote))
+                         ("{#REMOTE_COMMIT}" . ,(channel-commit remote))
+                         ("{#LOCAL_NAME}" . ,(channel-name local))
+                         ("{#LOCAL_URL}" . ,(channel-url local))
+                         ("{#LOCAL_COMMIT}" . ,(channel-commit local))))
+                     (channels profile)
+                     (remote-channels remote))))))
+    (('diff name)
+     (map (lambda (local remote)
+            (if (string=? name (symbol->string (channel-name local)))
+                (begin (display 0) (exit 1))
+                (begin (display 1) (exit 0))))
+          (channels profile)
+          (remote-channels remote)))))