scripts/mkusers: allow the creation of groups alone

Let mkusers create groups alone, useful for supplementary permissions in
udev/systemd for example where users can be added to later at runtime.
Use a magic string "-" to signal that user creation should be skipped.

Signed-off-by: Gustavo Zacarias <gustavo@zacarias.com.ar>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

diff --git a/support/scripts/mkusers b/support/scripts/mkusers
index ffd192dba3732b7e13199cfa5d6debe5db501276..5e5a5d9585add5e6abdd4e1be6601141d4bfcf3b 100755 (executable)
--- a/support/scripts/mkusers
+++ b/support/scripts/mkusers
@@ -397,6 +397,7 @@ main() {
     # Now, add users whose uid is *not* automatic
     while read username uid group gid passwd home shell groups comment; do
         [ -n "${username}" ] || continue    # Package with no user
+        [ "${username}" != "-" ] || continue # Magic string to skip user creation
         [ ${uid} -ge 0     ] || continue    # Automatic uid
         add_one_user "${username}" "${uid}" "${group}" "${gid}" "${passwd}" \
                      "${home}" "${shell}" "${groups}" "${comment}"
@@ -405,6 +406,7 @@ main() {
     # Finally, add users whose uid *is* automatic
     while read username uid group gid passwd home shell groups comment; do
         [ -n "${username}" ] || continue    # Package with no user
+        [ "${username}" != "-" ] || continue # Magic string to skip user creation
         [ ${uid} -eq -1    ] || continue    # Non-automatic uid
         add_one_user "${username}" "${uid}" "${group}" "${gid}" "${passwd}" \
                      "${home}" "${shell}" "${groups}" "${comment}"