[bug#51597] [PATCH] services: docker: Add 'environment-variables' configuration field.

[Alexey Abramov]

* gnu/services/docker.scm (docker-configuration):  Add the field
(docker-shepherd-service): Pass the list of defined variables to
make-forkexec-constructor.
* doc/guix.texi (Miscellaneous Services): Update doc.
---
 doc/guix.texi           | 3 +++
 gnu/services/docker.scm | 6 ++++++
 2 files changed, 9 insertions(+)

diff --git a/doc/guix.texi b/doc/guix.texi
index 8693249d7c..cf269d6014 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -33303,6 +33303,9 @@ Enable or disable debug output.
 @item @code{enable-iptables?} (default @code{#t})
 Enable or disable the addition of iptables rules.
 
+@item @code{environment-variables} (default: @code{()})
+Environment variables to set for dockerd
+
 @end table
 @end deftp
 
diff --git a/gnu/services/docker.scm b/gnu/services/docker.scm
index ef551480aa..c4d48676b5 100644
--- a/gnu/services/docker.scm
+++ b/gnu/services/docker.scm
@@ -62,6 +62,9 @@ loop-back communications.")
   (enable-iptables?
    (boolean #t)
    "Enable addition of iptables rules (enabled by default).")
+  (environment-variables
+   (list '())
+   "Environment variables to set for dockerd")
   (no-serialization))
 
 (define %docker-accounts
@@ -102,6 +105,7 @@ loop-back communications.")
   (let* ((docker (docker-configuration-docker config))
          (enable-proxy? (docker-configuration-enable-proxy? config))
          (enable-iptables? (docker-configuration-enable-iptables? config))
+         (environment-variables (docker-configuration-environment-variables 
config))
          (proxy (docker-configuration-proxy config))
          (debug? (docker-configuration-debug? config)))
     (shepherd-service
@@ -132,6 +136,8 @@ loop-back communications.")
                            (if #$enable-iptables?
                                "--iptables"
                                "--iptables=false"))
+                     #:environment-variables
+                     (list #$@environment-variables)
                      #:pid-file "/var/run/docker.pid"
                      #:log-file "/var/log/docker.log"))
            (stop #~(make-kill-destructor)))))
-- 
2.31.1