pseudo: Make realpath() remove trailing slashes

Linux system's realpath() remove trailing slashes, but pseudo's doesn't, need
make them identical.

E.g., the following code (rel.c) prints '/tmp' with system's realpath, but
pseudo's realpath prints '/tmp/':

    #include <stdio.h>
    #include <limits.h>
    #include <stdlib.h>

    int main() {
        char out[PATH_MAX];
        printf("%s\n", realpath("/tmp/", out));
        return 0;
    }

$ bitbake base-passwd -cdevshell # For pseudo env
$ gcc rel.c
$ ./a.out
/tmp/ (but should be /tmp)

This patch fixes the problem.

(From OE-Core rev: c251e753486dae9b460df315a6d19d6c81098ecb)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit 319bbf66e03377adf2db7efa93ef578e3460eb38)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/recipes-devtools/pseudo/files/0001-realpath.c-Remove-trailing-slashes.patch

@@ -0,0 +1,57 @@
+From 86c9a5610e3333ad6aaadb1ac1e8b5a2c948d119 Mon Sep 17 00:00:00 2001
+From: Robert Yang <liezhi.yang@windriver.com>
+Date: Mon, 25 Nov 2019 18:46:45 +0800
+Subject: [PATCH] realpath.c: Remove trailing slashes
+
+Linux system's realpath() remove trailing slashes, but pseudo's doesn't, need
+make them identical.
+
+E.g., the following code (rel.c) prints '/tmp' with system's realpath, but
+pseudo's realpath prints '/tmp/':
+
+    #include <stdio.h>
+    #include <limits.h>
+    #include <stdlib.h>
+
+    int main() {
+        char out[PATH_MAX];
+        printf("%s\n", realpath("/tmp/", out));
+        return 0;
+    }
+
+$ bitbake base-passwd -cdevshell # For pseudo env
+$ gcc rel.c
+$ ./a.out
+/tmp/ (but should be /tmp)
+
+This patch fixes the problem.
+
+Upstream-Status: Submitted [https://lists.yoctoproject.org/g/poky/message/11879]
+
+Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
+---
+ ports/unix/guts/realpath.c |    9 ++++++++-
+ 1 file changed, 8 insertions(+), 1 deletion(-)
+
+diff --git a/ports/unix/guts/realpath.c b/ports/unix/guts/realpath.c
+--- a/ports/unix/guts/realpath.c
++++ b/ports/unix/guts/realpath.c
+@@ -14,7 +14,14 @@
+ 		errno = ENAMETOOLONG;
+ 		return NULL;
+ 	}
+-	if ((len = strlen(rname)) >= pseudo_sys_path_max()) {
++		len = strlen(rname);
++		char *ep = rname + len - 1;
++		while (ep > rname && *ep == '/') {
++			--len;
++			*(ep--) = '\0';
++		}
++
++		if (len >= pseudo_sys_path_max()) {
+ 		errno = ENAMETOOLONG;
+ 		return NULL;
+ 	}
+-- 
+2.7.4
+

meta/recipes-devtools/pseudo/pseudo_git.bb

@@ -8,6 +8,7 @@ SRC_URI = "git://git.yoctoproject.org/pseudo \
            file://toomanyfiles.patch \
            file://0001-maketables-wrappers-use-Python-3.patch \
            file://0001-Add-statx.patch \
+           file://0001-realpath.c-Remove-trailing-slashes.patch \
            "
 
 SRCREV = "060058bb29f70b244e685b3c704eb0641b736f73"