[oe][Patch 2/2] util-linux: : use update-alternatives for fsfreeze, nsenter

[Max Krummenacher <max.oss.09@gmail.com>]

busybox may also provide a fsfreeze and nsenter implementation,
so use u-a to allow installing them side by side.
If one installs both, busybox and util-linux, one gets the following error
(seen on a populate-sdk run):

| ERROR: Postinstall scriptlets of ['busybox'] have failed. If the intention is to defer them to first boot,
| then please place them into pkg_postinst_ontarget_${PN} ().
| Deferring to first boot via 'exit 1' is no longer supported.

And the coresponding do_populate_sdk extract:

| ...
| update-alternatives: Error: not linking ...sdk/image/usr/local/oecore-x86_64/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/sbin/fsfreeze
|     to /bin/busybox.nosuid /bin/busybox.nosuid since ...sdk/image/usr/local/oecore-x86_64/sysroots/armv7at2hf-neon-angstrom-linux-gnueabi/usr/sbin/fsfreeze
|     exists and is not a link
| ...

Signed-off-by: Max Krummenacher <max.krummenacher@toradex.com>
---
 meta/recipes-core/util-linux/util-linux.inc | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/meta/recipes-core/util-linux/util-linux.inc b/meta/recipes-core/util-linux/util-linux.inc
index c2e02e847a..45e2203a64 100644
--- a/meta/recipes-core/util-linux/util-linux.inc
+++ b/meta/recipes-core/util-linux/util-linux.inc
@@ -205,9 +205,12 @@ do_install_append_class-native () {
 
 ALTERNATIVE_PRIORITY = "80"
 
-ALTERNATIVE_${PN}  = "dmesg kill more mkswap blockdev pivot_root switch_root"
-ALTERNATIVE_${PN} += "hexdump last lastb logger mesg renice wall unshare"
-ALTERNATIVE_${PN} += "setsid chrt flock utmpdump eject nologin taskset fallocate"
+ALTERNATIVE_${PN}  = " \
+    dmesg kill more mkswap blockdev pivot_root switch_root \
+    hexdump last lastb logger mesg renice wall unshare \
+    setsid chrt flock utmpdump eject nologin taskset fallocate \
+    fsfreeze nsenter \
+"
 
 ALTERNATIVE_LINK_NAME[dmesg] = "${base_bindir}/dmesg"
 ALTERNATIVE_LINK_NAME[kill] = "${base_bindir}/kill"
@@ -219,6 +222,7 @@ ALTERNATIVE_LINK_NAME[switch_root] = "${base_sbindir}/switch_root"
 ALTERNATIVE_LINK_NAME[eject] = "${bindir}/eject"
 ALTERNATIVE_LINK_NAME[unshare] = "${bindir}/unshare"
 ALTERNATIVE_LINK_NAME[fallocate] = "${bindir}/fallocate"
+ALTERNATIVE_LINK_NAME[fsfreeze] = "${sbindir}/fsfreeze"
 ALTERNATIVE_LINK_NAME[nologin] = "${base_sbindir}/nologin"
 
 ALTERNATIVE_${PN}-doc = "mountpoint.1 last.1 lastb.1 mesg.1 wall.1 nologin.8 sulogin.8 utmpdump.1 rfkill.8 kill.1 libblkid.3 blkid.8 findfs.8 fsck.8 uuid.3 eject.1 logger.1"
-- 
2.13.6