[OE-core] [PATCH V3 4/4] useradd.bbclass: avoid do_rootfs error for debian package backend

[Chen Qi]

If /etc/login.defs is treated as a configuration file, then we would meet
errors at do_rootfs time telling us that useradd/groupadd cannot execute
correctly.

This is because the dpkg handles config file specially, the login.defs
is temporarily renamed as login.defs.dpkg-new.

How ubuntu deals the user/group adding problem? They do it at postinst of the
package. And, the postinst script of a package would possibly do `chown' of
its files or directories.

The above strategy is not suitable for OE. Because we do chown in do_install
and add user/group in preinst scripts of the packages.

That's why we need this patch so that do_rootfs don't fail.

Signed-off-by: Chen Qi <Qi.Chen at windriver.com>
---
 meta/classes/useradd.bbclass | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/meta/classes/useradd.bbclass b/meta/classes/useradd.bbclass
index 0b9a843..e443f84 100644
--- a/meta/classes/useradd.bbclass
+++ b/meta/classes/useradd.bbclass
@@ -24,6 +24,16 @@ if test "x$D" != "x"; then
 	# Installing into a sysroot
 	SYSROOT="$D"
 	OPT="--root $D"
+
+	# Make sure login.defs is there, this is to make debian package backend work
+	# correctly while doing rootfs.
+	# The problem here is that if /etc/login.defs is treated as a config file for
+	# shadow package, then while performing preinsts for packages that depend on
+	# shadow, there might only be /etc/login.def.dpkg-new there in root filesystem.
+	if [ ! -e $D${sysconfdir}/login.defs -a -e $D${sysconfdir}/login.defs.dpkg-new ]; then
+	    cp $D${sysconfdir}/login.defs.dpkg-new $D${sysconfdir}/login.defs
+	fi
+
 	# user/group lookups should match useradd/groupadd --root
 	export PSEUDO_PASSWD="$SYSROOT:${STAGING_DIR_NATIVE}"
 fi
-- 
1.9.1