lib/process: Add dry_run argument to process_init

Implement dry-run behaviour on the discover server by passing a bool to
process_init. UIs don't need to support dry runs.

Signed-off-by: Jeremy Kerr <jk@ozlabs.org>

6 files changed, 11 insertions, 6 deletions

diff --git a/discover/pb-discover.c b/discover/pb-discover.c
index 61da509..6d62e14 100644
--- a/discover/pb-discover.c
+++ b/discover/pb-discover.c
@@ -168,7 +168,7 @@ int main(int argc, char *argv[])
 	if (!server)
 		return EXIT_FAILURE;
 
-	procset = process_init(server, waitset);
+	procset = process_init(server, waitset, opts.dry_run == opt_yes);
 	if (!procset)
 		return EXIT_FAILURE;
 
diff --git a/lib/process/process.c b/lib/process/process.c
index e1a158b..6fac649 100644
--- a/lib/process/process.c
+++ b/lib/process/process.c
@@ -29,6 +29,7 @@ struct procset {
 	struct list		async_list;
 	int			sigchld_pipe[2];
 	struct waiter		*sigchld_waiter;
+	bool			dry_run;
 };
 
 /* Internal data type for process handling
@@ -245,13 +246,14 @@ static int process_fini(void *p)
 	return 0;
 }
 
-struct procset *process_init(void *ctx, struct waitset *set)
+struct procset *process_init(void *ctx, struct waitset *set, bool dry_run)
 {
 	struct sigaction sa;
 	int rc;
 
 	procset = talloc(ctx, struct procset);
 	procset->waitset = set;
+	procset->dry_run = dry_run;
 	list_init(&procset->async_list);
 
 	rc = pipe(procset->sigchld_pipe);
@@ -330,6 +332,8 @@ static int process_run_common(struct process_info *procinfo)
 
 	if (pid == 0) {
 		process_setup_stdout_child(procinfo);
+		if (procset->dry_run)
+			exit(EXIT_SUCCESS);
 		execvp(process->path, (char * const *)process->argv);
 		exit(EXIT_FAILURE);
 	}
diff --git a/lib/process/process.h b/lib/process/process.h
index 9e2a2d1..caeda92 100644
--- a/lib/process/process.h
+++ b/lib/process/process.h
@@ -47,7 +47,7 @@ struct process {
  * process_create. The pointer returned can be talloc_free()-ed, or can be
  * automatically freed through destruction of the ctx talloc tree.
  */
-struct procset *process_init(void *ctx, struct waitset *set);
+struct procset *process_init(void *ctx, struct waitset *set, bool dry_run);
 
 struct process *process_create(void *ctx);
 
diff --git a/ui/ncurses/nc-cui.c b/ui/ncurses/nc-cui.c
index b09f030..4f7b121 100644
--- a/ui/ncurses/nc-cui.c
+++ b/ui/ncurses/nc-cui.c
@@ -508,7 +508,7 @@ struct cui *cui_init(void* platform_info,
 	cui->platform_info = platform_info;
 	cui->waitset = waitset_create(cui);
 
-	process_init(cui, cui->waitset);
+	process_init(cui, cui->waitset, false);
 
 	setlocale(LC_ALL, "");
 
diff --git a/ui/ncurses/nc-cui.h b/ui/ncurses/nc-cui.h
index a5ac5d5..4c13ddf 100644
--- a/ui/ncurses/nc-cui.h
+++ b/ui/ncurses/nc-cui.h
@@ -62,7 +62,8 @@ struct cui {
 };
 
 struct cui *cui_init(void* platform_info,
-	int (*js_map)(const struct js_event *e), int start_deamon);
+		int (*js_map)(const struct js_event *e),
+		int start_deamon);
 struct nc_scr *cui_set_current(struct cui *cui, struct nc_scr *scr);
 int cui_run(struct cui *cui, struct pmenu *main, unsigned int default_item);
 int cui_boot_editor_run(struct pmenu_item *item);
diff --git a/ui/twin/pbt-client.c b/ui/twin/pbt-client.c
index 20ce31a..dba6110 100644
--- a/ui/twin/pbt-client.c
+++ b/ui/twin/pbt-client.c
@@ -270,7 +270,7 @@ struct pbt_client *pbt_client_init(enum pbt_twin_backend backend,
 
 	pbt_client->waitset = waitset_create(pbt_client);
 
-	process_init(pbt_client, pbt_client->waitset);
+	process_init(pbt_client, pbt_client->waitset, false);
 
 	pbt_client->sig = "pbt_client";
 	pbt_client->frame.scr = pbt_scr_init(pbt_client, pbt_client->waitset,