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: 319bbf66e03377adf2db7efa93ef578e3460eb38)

Signed-off-by: Robert Yang <liezhi.yang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 57 insertions, 0 deletions

diff --git a/meta/recipes-devtools/pseudo/files/0001-realpath.c-Remove-trailing-slashes.patch b/meta/recipes-devtools/pseudo/files/0001-realpath.c-Remove-trailing-slashes.patch
new file mode 100644
index 0000000000..17829ef3ac
--- /dev/null
+++ b/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
+