util-linux: use u-a for su

Use alternatives mechanism to prevent confliction of attempted
installing su binary among busybox, shadow and util-linux.

[YOCTO #4926]

(From OE-Core rev: 6190c69a9f78aeef951c39e4c8700e945bbec5f7)

Signed-off-by: Hongxu Jia <hongxu.jia@windriver.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 7 insertions, 0 deletions

diff --git a/meta/recipes-core/util-linux/util-linux.inc b/meta/recipes-core/util-linux/util-linux.inc
index 3c8c246974..961bcc5843 100644
--- a/meta/recipes-core/util-linux/util-linux.inc
+++ b/meta/recipes-core/util-linux/util-linux.inc
@@ -215,3 +215,10 @@ ALTERNATIVE_LINK_NAME[reset] = "${bindir}/reset"
 ALTERNATIVE_TARGET[reset] = "${base_bindir}/reset"
 
 BBCLASSEXTEND = "native nativesdk"
+
+python do_package_prepend () {
+    if '--enable-su' in d.getVar('EXTRA_OECONF', True).split():
+        alt_name = "su"
+        d.setVarFlag('ALTERNATIVE_LINK_NAME', alt_name, '%s/%s' % (d.getVar('bindir', True), alt_name))
+        d.appendVar('ALTERNATIVE_%s' % (d.getVar('PN', True)), ' ' + alt_name)
+}