kernel: Fix path comparison in kernel staging dir symlinking

Due to an oversight in the do_symlink_kernsrc function, the path
comparison between "S" and "STAGING_KERNEL_DIR" is broken. The code
obtains both variables, but modifies the local copy of "S" before
comparing them, causing the comparison to always return false.

This can cause the build to fail when the EXTERNALSRC flag is enabled,
since the code will try to create a symlink even if one already exists.

This patch resolves the issue by comparing the variables before they are
modified.

(From OE-Core rev: cf2267f80ec44b24c627347df7efbd492a07dcfa)

Signed-off-by: Staffan Rydén <staffan.ryden@axis.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
(cherry picked from commit afd2038ef8a66a5e6433be31a14e1eb0d9f9a1d3)
Signed-off-by: Steve Sakoman <steve@sakoman.com>

1 files changed, 4 insertions, 3 deletions

diff --git a/meta/classes/kernel.bbclass b/meta/classes/kernel.bbclass
index a82e4cf942..f7d199e917 100644
--- a/meta/classes/kernel.bbclass
+++ b/meta/classes/kernel.bbclass
@@ -176,13 +176,14 @@ do_unpack[cleandirs] += " ${S} ${STAGING_KERNEL_DIR} ${B} ${STAGING_KERNEL_BUILD
 do_clean[cleandirs] += " ${S} ${STAGING_KERNEL_DIR} ${B} ${STAGING_KERNEL_BUILDDIR}"
 python do_symlink_kernsrc () {
     s = d.getVar("S")
-    if s[-1] == '/':
-        # drop trailing slash, so that os.symlink(kernsrc, s) doesn't use s as directory name and fail
-        s=s[:-1]
     kernsrc = d.getVar("STAGING_KERNEL_DIR")
     if s != kernsrc:
         bb.utils.mkdirhier(kernsrc)
         bb.utils.remove(kernsrc, recurse=True)
+        if s[-1] == '/':
+            # drop trailing slash, so that os.symlink(kernsrc, s) doesn't use s as
+            # directory name and fail
+            s = s[:-1]
         if d.getVar("EXTERNALSRC"):
             # With EXTERNALSRC S will not be wiped so we can symlink to it
             os.symlink(s, kernsrc)