services: greetd: Create runfiles in a tmpfs.

Greetd's initial-session (i.e. auto-login) functionality requires runfiles
to be deleted on shutdown.  Use a tmpfs to ensure said runfiles do not linger.

* gnu/services/base.scm (make-greetd-terminal-configuration-file): Add
“runfile” to configuration.
(%greetd-file-systems): Add a tmpfs for “/run/greetd/runfiles”.

Change-Id: I07319d5d8bdb1e18fb0074b67d5c9cb9fb49b04a
Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>

1 files changed, 9 insertions, 0 deletions

diff --git a/gnu/services/base.scm b/gnu/services/base.scm
index 4a4f1d17c18..6a5ed3aa578 100644
--- a/gnu/services/base.scm
+++ b/gnu/services/base.scm
@@ -4029,6 +4029,7 @@ to handle."
      config-file-name
      "[general]\n"
      "source_profile = " (if source-profile? "true" "false") "\n"
+     "runfile = /run/greetd/runfiles/greetd-" terminal-vt ".run\n"
      "[terminal]\n"
      "vt = " terminal-vt "\n"
      "switch = " (if terminal-switch "true" "false") "\n"
@@ -4050,6 +4051,14 @@ to handle."
           (check? #f)
           (flags '(no-suid no-dev no-exec))
           (options "mode=0755")
+          (create-mount-point? #t))
+        (file-system
+          (device "none")
+          (mount-point "/run/greetd/runfiles")
+          (type "tmpfs")
+          (check? #f)
+          (flags '(no-suid no-dev no-exec))
+          (options "mode=0755")
           (create-mount-point? #t))))
 
 (define %greetd-pam-mount-rules