[Buildroot] [PATCH] support/mkusers: Preserve group members

[Yann E. MORIN <yann.morin.1998@free.fr>]

Johan, All,

On 2018-09-03 15:11 +0200, Johan Oudinet spake thusly:
> When the function add_one_group is called on an existing group,
> make sure the members of this group are not removed in the process of
> deleting then re-adding the group.
> 
> Signed-off-by: Johan Oudinet <johan.oudinet@gmail.com>

Reviewed-by: "Yann E. MORIN" <yann.morin.1998@free.fr>

Regards,
Yann E. MORIN.

> ---
>  support/scripts/mkusers | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)
> 
> diff --git a/support/scripts/mkusers b/support/scripts/mkusers
> index 5bbec3e10f..ec75c02dac 100755
> --- a/support/scripts/mkusers
> +++ b/support/scripts/mkusers
> @@ -75,6 +75,14 @@ get_gid() {
>          '$1 == group { printf( "%d\n", $3 ); }' "${GROUP}"
>  }
>  
> +#----------------------------------------------------------------------------
> +get_members() {
> +    local group="${1}"
> +
> +    awk -F: -v group="${group}"                             \
> +        '$1 == group { printf( "%s\n", $4 ); }' "${GROUP}"
> +}
> +
>  #----------------------------------------------------------------------------
>  get_username() {
>      local uid="${1}"
> @@ -211,16 +219,17 @@ generate_gid() {
>  add_one_group() {
>      local group="${1}"
>      local gid="${2}"
> -    local _f
> +    local members
>  
>      # Generate a new GID if needed
>      if [ ${gid} -eq -1 ]; then
>          gid="$( generate_gid "${group}" )"
>      fi
>  
> +    members=$(get_members "$group")
>      # Remove any previous instance of this group, and re-add the new one
>      sed -i --follow-symlinks -e '/^'"${group}"':.*/d;' "${GROUP}"
> -    printf "%s:x:%d:\n" "${group}" "${gid}" >>"${GROUP}"
> +    printf "%s:x:%d:%s\n" "${group}" "${gid}" "$members" >>"${GROUP}"
>  
>      # Ditto for /etc/gshadow if it exists
>      if [ -f "${GSHADOW}" ]; then
> -- 
> 2.17.1
> 
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