make busybox --install work even if /proc/self/exe doesn't exist

# size busybox_old busybox_unstripped
   text    data     bss     dec     hex filename
 680095    2704   15648  698447   aa84f busybox_old
 680099    2704   15648  698451   aa853 busybox_unstripped

1 files changed, 6 insertions, 14 deletions

diff --git a/applets/applets.c b/applets/applets.c
index bd3704394..f34124252 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -577,21 +577,13 @@ static int busybox_main(char **argv)
 	}
 
 	if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
-		int use_symbolic_links = 0;
-		char *busybox;
-
-		/* to use symlinks, or not to use symlinks... */
-		if (argv[2])
-			if (strcmp(argv[2], "-s") == 0)
-				use_symbolic_links = 1;
-
-		/* link */
-		busybox = xmalloc_readlink_or_warn("/proc/self/exe");
+		const char *busybox;
+		busybox = xmalloc_readlink_or_warn(bb_busybox_exec_path);
 		if (!busybox)
-			return 1;
-		install_links(busybox, use_symbolic_links);
-		if (ENABLE_FEATURE_CLEAN_UP)
-			free(busybox);
+			busybox = bb_busybox_exec_path;
+		/* -s makes symlinks */
+		install_links(busybox,
+				 argv[2] && strcmp(argv[2], "-s") == 0);
 		return 0;
 	}