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swaybar: ensure correct init order for status_line

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`$WAYLAND_SOCKET` is unset by `wl_display_connect` after it has
successfully connected to the wayland socket.

However, subprocesses spawned by swaybar (status-command) don't have
access to waybar's fds as $WAYLAND_SOCKET is O_CLOEXEC. This means any
status command which itself tries to connect to wayland will fail if
this environment variable is set.

Reorder display and status-command initialization so that this variable
is not set and add an assert so we can enforce this invariant in future.
This commit is contained in:
Luke Drummond 2020-06-11 01:29:07 +01:00 • committed by Simon Ser
parent bf8d23a836
commit c22caa54a8
2 changed files with 8 additions and 4 deletions
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3
swaybar/status_line.c
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@ -1,4 +1,5 @@
#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <json.h>
@ -153,6 +154,8 @@ struct status_line *status_line_init(char *cmd) {
exit(1);
}
assert(!getenv("WAYLAND_SOCKET") && "display must be initialized before "
" starting `status-command`; WAYLAND_SOCKET should not be set");
status->pid = fork();
if (status->pid == 0) {
dup2(pipe_read_fd[1], STDOUT_FILENO);