[git commit] ash: in standalone mode, search in $PATH if /proc/self/exe doesn't exist

[Denys Vlasenko]

commit: http://git.busybox.net/busybox/commit/?id=83f103b30e41ab038e45661df97625f655abe491
branch: http://git.busybox.net/busybox/commit/?id=refs/heads/master

Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 shell/ash.c |   12 +++++++++---
 1 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/shell/ash.c b/shell/ash.c
index b4ed8e5..d197fa1 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -7471,9 +7471,7 @@ shellexec(char **argv, const char *path, int idx)
 	int e;
 	char **envp;
 	int exerrno;
-#if ENABLE_FEATURE_SH_STANDALONE
-	int applet_no = -1;
-#endif
+	int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */
 
 	clearredir(/*drop:*/ 1);
 	envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL);
@@ -7483,8 +7481,16 @@ shellexec(char **argv, const char *path, int idx)
 #endif
 	) {
 		tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) argv[0], argv, envp);
+		if (applet_no >= 0) {
+			/* We tried execing ourself, but it didn't work.
+			 * Maybe /proc/self/exe doesn't exist?
+			 * Try $PATH search.
+			 */
+			goto try_PATH;
+		}
 		e = errno;
 	} else {
+ try_PATH:
 		e = ENOENT;
 		while ((cmdname = path_advance(&path, argv[0])) != NULL) {
 			if (--idx < 0 && pathopt == NULL) {