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refactor both i3-nagbar starts into src/util.c

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With this change, libev >= 4 is a hard dependency. It should be present
in all major linux distributions (even the latest ubuntu LTS).
This commit is contained in:
Michael Stapelberg
2012-12-24 16:53:20 +01:00
parent c127ac3855
commit b3d7531947
12 changed files with 271 additions and 389 deletions
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198
src/config_parser.c
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@ -43,10 +43,7 @@
#define ystr(str) yajl_gen_string(command_output.json_gen, (unsigned char*)str, strlen(str))
#ifndef TEST_PARSER
static pid_t configerror_pid = -1;
/* The path to the temporary script files used by i3-nagbar. We need to keep
* them around to delete the files in the i3-nagbar SIGCHLD handler. */
static char *edit_script_path, *pager_script_path;
pid_t config_error_nagbar_pid = -1;
static struct context *context;
#endif
@ -664,93 +661,6 @@ int main(int argc, char *argv[]) {
#else
/*
* Writes the given command as a shell script to path.
* Returns true unless something went wrong.
*
*/
static bool write_nagbar_script(const char *path, const char *command) {
int fd = open(path, O_WRONLY | O_CREAT | O_TRUNC, S_IRUSR | S_IWUSR | S_IXUSR);
if (fd == -1) {
warn("Could not create temporary script to store the nagbar command");
return false;
}
write(fd, "#!/bin/sh\n", strlen("#!/bin/sh\n"));
write(fd, command, strlen(command));
close(fd);
return true;
}
/*
* Handler which will be called when we get a SIGCHLD for the nagbar, meaning
* it exited (or could not be started, depending on the exit code).
*
*/
static void nagbar_exited(EV_P_ ev_child *watcher, int revents) {
ev_child_stop(EV_A_ watcher);
if (unlink(edit_script_path) != 0)
warn("Could not delete temporary i3-nagbar script %s", edit_script_path);
if (unlink(pager_script_path) != 0)
warn("Could not delete temporary i3-nagbar script %s", pager_script_path);
if (!WIFEXITED(watcher->rstatus)) {
fprintf(stderr, "ERROR: i3-nagbar did not exit normally.\n");
return;
}
int exitcode = WEXITSTATUS(watcher->rstatus);
printf("i3-nagbar process exited with status %d\n", exitcode);
if (exitcode == 2) {
fprintf(stderr, "ERROR: i3-nagbar could not be found. Is it correctly installed on your system?\n");
}
configerror_pid = -1;
}
/* We need ev >= 4 for the following code. Since it is not *that* important (it
* only makes sure that there are no i3-nagbar instances left behind) we still
* support old systems with libev 3. */
#if EV_VERSION_MAJOR >= 4
/*
* Cleanup handler. Will be called when i3 exits. Kills i3-nagbar with signal
* SIGKILL (9) to make sure there are no left-over i3-nagbar processes.
*
*/
static void nagbar_cleanup(EV_P_ ev_cleanup *watcher, int revent) {
if (configerror_pid != -1) {
LOG("Sending SIGKILL (9) to i3-nagbar with PID %d\n", configerror_pid);
kill(configerror_pid, SIGKILL);
}
}
#endif
/*
* Kills the configerror i3-nagbar process, if any.
*
* Called when reloading/restarting.
*
* If wait_for_it is set (restarting), this function will waitpid(), otherwise,
* ev is assumed to handle it (reloading).
*
*/
void kill_configerror_nagbar(bool wait_for_it) {
if (configerror_pid == -1)
return;
if (kill(configerror_pid, SIGTERM) == -1)
warn("kill(configerror_nagbar) failed");
if (!wait_for_it)
return;
/* When restarting, we don’t enter the ev main loop anymore and after the
* exec(), our old pid is no longer watched. So, ev won’t handle SIGCHLD
* for us and we would end up with a <defunct> process. Therefore we
* waitpid() here. */
waitpid(configerror_pid, NULL, 0);
}
/*
* Goes through each line of buf (separated by \n) and checks for statements /
* commands which only occur in i3 v4 configuration files. If it finds any, it
@ -972,86 +882,6 @@ static void check_for_duplicate_bindings(struct context *context) {
}
}
/*
* Starts an i3-nagbar process which alerts the user that his configuration
* file contains one or more errors. Also offers two buttons: One to launch an
* $EDITOR on the config file and another one to launch a $PAGER on the error
* logfile.
*
*/
static void start_configerror_nagbar(const char *config_path) {
if (only_check_config)
return;
fprintf(stderr, "Starting i3-nagbar due to configuration errors\n");
/* We need to create a custom script containing our actual command
* since not every terminal emulator which is contained in
* i3-sensible-terminal supports -e with multiple arguments (and not
* all of them support -e with one quoted argument either).
*
* NB: The paths need to be unique, that is, don’t assume users close
* their nagbars at any point in time (and they still need to work).
* */
edit_script_path = get_process_filename("nagbar-cfgerror-edit");
pager_script_path = get_process_filename("nagbar-cfgerror-pager");
configerror_pid = fork();
if (configerror_pid == -1) {
warn("Could not fork()");
return;
}
/* child */
if (configerror_pid == 0) {
char *edit_command, *pager_command;
sasprintf(&edit_command, "i3-sensible-editor \"%s\" && i3-msg reload\n", config_path);
sasprintf(&pager_command, "i3-sensible-pager \"%s\"\n", errorfilename);
if (!write_nagbar_script(edit_script_path, edit_command) ||
!write_nagbar_script(pager_script_path, pager_command))
return;
char *editaction,
*pageraction;
sasprintf(&editaction, "i3-sensible-terminal -e \"%s\"", edit_script_path);
sasprintf(&pageraction, "i3-sensible-terminal -e \"%s\"", pager_script_path);
char *argv[] = {
NULL, /* will be replaced by the executable path */
"-t",
(context->has_errors ? "error" : "warning"),
"-m",
(context->has_errors ?
"You have an error in your i3 config file!" :
"Your config is outdated. Please fix the warnings to make sure everything works."),
"-b",
"edit config",
editaction,
(errorfilename ? "-b" : NULL),
(context->has_errors ? "show errors" : "show warnings"),
pageraction,
NULL
};
exec_i3_utility("i3-nagbar", argv);
}
/* parent */
/* install a child watcher */
ev_child *child = smalloc(sizeof(ev_child));
ev_child_init(child, &nagbar_exited, configerror_pid, 0);
ev_child_start(main_loop, child);
/* We need ev >= 4 for the following code. Since it is not *that* important (it
* only makes sure that there are no i3-nagbar instances left behind) we still
* support old systems with libev 3. */
#if EV_VERSION_MAJOR >= 4
/* install a cleanup watcher (will be called when i3 exits and i3-nagbar is
* still running) */
ev_cleanup *cleanup = smalloc(sizeof(ev_cleanup));
ev_cleanup_init(cleanup, nagbar_cleanup);
ev_cleanup_start(main_loop, cleanup);
#endif
}
/*
* Parses the given file by first replacing the variables, then calling
* parse_config and possibly launching i3-nagbar.
@ -1222,7 +1052,31 @@ void parse_file(const char *f) {
ELOG("FYI: You are using i3 version " I3_VERSION "\n");
if (version == 3)
ELOG("Please convert your configfile first, then fix any remaining errors (see above).\n");
start_configerror_nagbar(f);
char *editaction,
*pageraction;
sasprintf(&editaction, "i3-sensible-editor \"%s\" && i3-msg reload\n", f);
sasprintf(&pageraction, "i3-sensible-pager \"%s\"\n", errorfilename);
char *argv[] = {
NULL, /* will be replaced by the executable path */
"-t",
(context->has_errors ? "error" : "warning"),
"-m",
(context->has_errors ?
"You have an error in your i3 config file!" :
"Your config is outdated. Please fix the warnings to make sure everything works."),
"-b",
"edit config",
editaction,
(errorfilename ? "-b" : NULL),
(context->has_errors ? "show errors" : "show warnings"),
pageraction,
NULL
};
start_nagbar(&config_error_nagbar_pid, argv);
free(editaction);
free(pageraction);
}
FREE(context->line_copy);