[oe] [PATCH V2] postfix: split /etc from ${PN} to ${PN}-cfg for ostree

[Hongxu Jia]

In postinst of ${PN}, call newaliases on etc may fail at do_rootfs
due to host setup. If fail, the postinst will rerun at target first
boot which cause update-alternatives in postinst rerun.

For ostree system, /usr is readonly, /etc is writable, the
update-alternatives will be failed when run on target since it
needs write files in /usr. Split the postinst into two packages
can fix the problem:
* update-alternatives runs at do_rootfs
* newaliases runs at do_rootfs or first boot, it needs write files
  in /etc when run at first boot, while /etc is writable for ostree.

For non-ostree, everything will be OK as normal

Signed-off-by: Hongxu Jia <hongxu.jia at windriver.com>
---
 meta-networking/recipes-daemons/postfix/postfix.inc | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/meta-networking/recipes-daemons/postfix/postfix.inc b/meta-networking/recipes-daemons/postfix/postfix.inc
index 7781005..de45e08 100644
--- a/meta-networking/recipes-daemons/postfix/postfix.inc
+++ b/meta-networking/recipes-daemons/postfix/postfix.inc
@@ -203,7 +203,7 @@ ALTERNATIVE_LINK_NAME[newaliases.1] = "${mandir}/man1/newaliases.1"
 ALTERNATIVE_LINK_NAME[sendmail.1] = "${mandir}/man1/sendmail.1"
 
 PACKAGE_WRITE_DEPS += "postfix-native"
-pkg_postinst_${PN} () {
+pkg_postinst_${PN}-cfg () {
     if [ "x$D" = "x" ]; then
         touch /etc/aliases
         newaliases
@@ -224,7 +224,10 @@ pkg_postinst_${PN} () {
     fi
 }
 
+PACKAGES =+ "${PN}-cfg"
+RDEPENDS_${PN}_class-target += "${PN}-cfg"
 # Exclude .debug directories from the main package
-FILES_${PN} = "${sysconfdir} ${localstatedir} ${bindir}/* ${sbindir}/* \
+FILES_${PN} = "${localstatedir} ${bindir}/* ${sbindir}/* \
                ${libexecdir}/* ${systemd_unitdir}/*"
+FILES_${PN}-cfg = "${sysconfdir}"
 FILES_${PN}-dbg += "${libexecdir}/postfix/.debug"
-- 
2.7.4