services: elogind: Fix runtime-directory-size field.

Both runtime-directory-size and runtime-directory-size-percent field currently
cause an error if set.  A comment above the latter already calls for its
deprecation.  This patch combines both into a single field and fixes
their serialization.

* gnu/services/desktop.scm (percent?, percent, elogind-serialize-percent):
Replace with…
(non-negative-integer-and-suffix?, non-negative-integer-and-suffix)
(elogind-serialize-non-negative-integer-and-suffix): … these.
(elogind-configuration)[runtime-directory-size-percent]: Remove field,
integrating logic into …
[runtime-directory-size]: … here.  Serialize it.
* doc/guix.texi (Desktop Services): Adjust accordingly.

Signed-off-by: Liliana Marie Prikler <liliana.prikler@gmail.com>
Merges: guix/guix#9987

1 files changed, 6 insertions, 10 deletions

diff --git a/doc/guix.texi b/doc/guix.texi
index b34f0d1d3da..d2e8f2335a5 100644
--- a/doc/guix.texi
+++ b/doc/guix.texi
@@ -27671,16 +27671,12 @@ Action to take when the system is idle.
 The delay after which the action configured in @code{idle-action} is
 taken after the system is idle.
 
-@item @code{runtime-directory-size-percent} (type: maybe-percent)
-Set the size limit, in percent, on the @env{XDG_RUNTIME_DIR} runtime
-directory for each user who logs in.  This specifies the per-user size
-limit relative to the amount of physical @acronym{RAM,read access
-memory}.  This value takes precedence over that specified via
-@code{runtime-directory-size}.
-
-@item @code{runtime-directory-size} (type: maybe-non-negative-integer)
-Set the size limit, in bytes, on the @env{XDG_RUNTIME_DIR} runtime
-directory for each user who logs in.
+@item @code{runtime-directory-size} (default: @code{'(10 . %)}) (type: maybe-non-negative-integer-and-suffix)
+Set the size limit on the @env{XDG_RUNTIME_DIR} runtime directory for
+each user who logs in.  The size in bytes can be given as an integer and
+paired with symbols: K, M, G, or T.  When paired with @code{'%}, the
+integer represents the limit as a percentage share of the total amount
+of physical @acronym{RAM, read access memory}.
 
 @item @code{remove-ipc?} (default: @code{#t}) (type: maybe-boolean)
 Whether @acronym{IPC,inter-process communication} objects belonging to