useradd.bbclass: Add ability to select a static uid/gid automatically

[YOCTO #5436]

Automatic selection of static uid/gid is needed for a dynamically generated
passwd and group file to have a deterministic outcome.

When a package is installed and instructs the system to add a new user or
group, unless it selects a static uid/gid value, the next available uid/gid
will be used.  The order in which packages are installed is dynamically
computed, and may change from one installation to the next.  This results
in a non-deterministic set of uid/gid values.

Enabling this code by adding USERADDEXTENSION = "useradd-staticids", and
adding a preconfigured passwd/group file will allow the continued dynamic
generation of the rootfs passwd/group files, but will ensure a deterministic
outcome.  (Dynamic generation is desired so that users and groups that have
no corresponding functionality are not present within the final system image.)

The rewrite params function will override each of the fields in the
useradd and groupadd calls with the values specified.  Note, the password
field is ignored as is the member groups field in the group file.  If the
field is empty, the value will not be overridden.  (Note, there is no way
to 'blank' a field, as this would only generally affect the 'comment' field
and there really is no reason to blank it.)

Enabling USERADD_ERROR_DYNAMIC will cause packages without static uid/gid
to generate an error and be skipped for the purpose of building.  This is
used to prevent non-deterministic behavior.

USERADD_UID_TABLES and USERADD_GID_TABLES may be used to specify the name
of the passwd and group files.  By default they are assumed to be
'files/passwd' and 'files/group'.  Layers are searched in BBPATH order.

Signed-off-by: Mark Hatle <mark.hatle@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/meta/classes/useradd.bbclass b/meta/classes/useradd.bbclass
index ad6f61a3d4..22bae97324 100644
--- a/meta/classes/useradd.bbclass
+++ b/meta/classes/useradd.bbclass
@@ -202,3 +202,8 @@ fakeroot python populate_packages_prepend () {
         for pkg in useradd_packages.split():
             update_useradd_package(pkg)
 }
+
+# Use the following to extend the useradd with custom functions
+USERADDEXTENSION ?= ""
+
+inherit ${USERADDEXTENSION}