ui/ncurses: Spawn shell in exit handler

In cui_on_exit()_ instead of exiting the program spawn a sh instance.
This allows the user to drop to the shell and return without losing any
custom boot options, for example.
SIGINT still calls cui_abort() to properly exit Petitboot.

Signed-off-by: Samuel Mendoza-Jonas <sam@mendozajonas.com>

2 files changed, 2 insertions, 0 deletions

diff --git a/lib/system/system.c b/lib/system/system.c
index 33f79ed..b1121a1 100644
--- a/lib/system/system.c
+++ b/lib/system/system.c
@@ -32,6 +32,7 @@ const struct pb_system_apps pb_system_apps = {
 	.vgchange	= HOST_PROG_VGCHANGE,
 	.pb_plugin	= HOST_PROG_PB_PLUGIN,
 	.pb_exec	= HOST_PROG_PB_EXEC,
+	.sh		= HOST_PROG_SH,
 };
 
 #ifndef TFTP_TYPE
diff --git a/lib/system/system.h b/lib/system/system.h
index e803391..d27c2cd 100644
--- a/lib/system/system.h
+++ b/lib/system/system.h
@@ -17,6 +17,7 @@ struct pb_system_apps {
 	const char *vgchange;
 	const char *pb_plugin;
 	const char *pb_exec;
+	const char *sh;
 };
 
 extern const struct pb_system_apps pb_system_apps;