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logind: add ListSeats Varlink method

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The Varlink ListSeats method accepts an optional Id filter, folding in
the D-Bus GetSeat(s) lookup.

Passing Id yields a single reply on match, or NoSuchSeat on miss.
Passing no Id with the 'more' flag streams the full list; passing no
Id without 'more' resolves to the caller's seat (preserving the
ergonomic default of GetSeat). The Id filter supports the special
names "self" and "auto" which resolve to the caller's seat.

The SeatInfo type in the io.systemd.Login Varlink IDL carries all seat
properties matching the D-Bus org.freedesktop.login1.Seat interface.
This commit is contained in:
Yaping Li
2026-05-22 02:56:24 +00:00
parent 355f73a564
commit b4de3e5759
5 changed files with 233 additions and 1 deletions
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src/shared/varlink-io.systemd.Login.c
+36
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@@ -200,6 +200,36 @@ static SD_VARLINK_DEFINE_METHOD_FULL(
SD_VARLINK_FIELD_COMMENT("Runtime information of the user"),
SD_VARLINK_DEFINE_OUTPUT_BY_TYPE(runtime, UserRuntime, 0));
static SD_VARLINK_DEFINE_STRUCT_TYPE(
SeatContext,
SD_VARLINK_FIELD_COMMENT("The seat identifier"),
SD_VARLINK_DEFINE_FIELD(Id, SD_VARLINK_STRING, 0));
static SD_VARLINK_DEFINE_STRUCT_TYPE(
SeatRuntime,
SD_VARLINK_FIELD_COMMENT("The currently active session on this seat, if any"),
SD_VARLINK_DEFINE_FIELD(ActiveSession, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("Identifiers of sessions assigned to this seat"),
SD_VARLINK_DEFINE_FIELD(Sessions, SD_VARLINK_STRING, SD_VARLINK_NULLABLE|SD_VARLINK_ARRAY),
SD_VARLINK_FIELD_COMMENT("Whether this seat supports text terminal sessions"),
SD_VARLINK_DEFINE_FIELD(CanTTY, SD_VARLINK_BOOL, 0),
SD_VARLINK_FIELD_COMMENT("Whether this seat supports graphical sessions"),
SD_VARLINK_DEFINE_FIELD(CanGraphical, SD_VARLINK_BOOL, 0),
SD_VARLINK_FIELD_COMMENT("Whether the seat is idle"),
SD_VARLINK_DEFINE_FIELD(IdleHint, SD_VARLINK_BOOL, 0),
SD_VARLINK_FIELD_COMMENT("Timestamp when the seat went idle, only present when IdleHint is true"),
SD_VARLINK_DEFINE_FIELD_BY_TYPE(IdleSinceHint, Timestamp, SD_VARLINK_NULLABLE));
static SD_VARLINK_DEFINE_METHOD_FULL(
ListSeats,
SD_VARLINK_SUPPORTS_MORE,
SD_VARLINK_FIELD_COMMENT("If non-null, the identifier string of a seat to look up."),
SD_VARLINK_DEFINE_INPUT(Id, SD_VARLINK_STRING, SD_VARLINK_NULLABLE),
SD_VARLINK_FIELD_COMMENT("Configuration of the seat"),
SD_VARLINK_DEFINE_OUTPUT_BY_TYPE(context, SeatContext, 0),
SD_VARLINK_FIELD_COMMENT("Runtime information of the seat"),
SD_VARLINK_DEFINE_OUTPUT_BY_TYPE(runtime, SeatRuntime, 0));
static SD_VARLINK_DEFINE_ERROR(NoSuchSession);
static SD_VARLINK_DEFINE_ERROR(NoSuchUser);
static SD_VARLINK_DEFINE_ERROR(NoSuchSeat);
@@ -237,6 +267,12 @@ SD_VARLINK_DEFINE_INTERFACE(
&vl_type_UserRuntime,
SD_VARLINK_SYMBOL_COMMENT("Lists current users. If a UID or PID filter is provided, returns the single matching user; otherwise streams all current users (requires the 'more' flag). If called with no parameters and no 'more' flag, resolves to the caller's user."),
&vl_method_ListUsers,
SD_VARLINK_SYMBOL_COMMENT("Configuration aspects of a seat"),
&vl_type_SeatContext,
SD_VARLINK_SYMBOL_COMMENT("Runtime state and dynamic information of a seat"),
&vl_type_SeatRuntime,
SD_VARLINK_SYMBOL_COMMENT("Lists current seats. If an Id filter is provided (or the caller has a session), returns the single matching seat; otherwise streams all current seats (requires the 'more' flag). If called with no parameters and no 'more' flag, resolves to the caller's seat."),
&vl_method_ListSeats,
SD_VARLINK_SYMBOL_COMMENT("No session by this name found"),
&vl_error_NoSuchSession,
SD_VARLINK_SYMBOL_COMMENT("No seat by this name found"),