Re: [gentoo-dev] [PATCH] acct-*.eclass: Allow dynamic UID/GID assignment via -1

[Michał Górny]

On Wed, 2019-08-07 at 19:10 +0200, Michał Górny wrote:
> Allow a special value of '-1' to dynamically assign UID/GID for the user
> or group.  This is intended to be used in overlays where proper
> assignment does not take place but whose owners wish to switch to acct-*
> packages.
>
> While technically it is possible to choose a free UID/GID, it could be
> taken afterwards by some Gentoo package and unnecessarily introduce
> a conflict.  Using '999' was also suggested (as the first dynamic
> UID/GID) but it would cause issues for people enabling
> ACCT_*_ENFORCE_ID.  To avoid this, '-1' does not trigger collision
> checks.
>
> Signed-off-by: Michał Górny <mgorny@g.o>
> ---
>  eclass/acct-group.eclass | 4 ++++
>  eclass/acct-user.eclass  | 4 ++++
>  2 files changed, 8 insertions(+)
>
> diff --git a/eclass/acct-group.eclass b/eclass/acct-group.eclass
> index 9eab00db690f..d5ccd209c9e3 100644
> --- a/eclass/acct-group.eclass
> +++ b/eclass/acct-group.eclass
> @@ -59,6 +59,9 @@ readonly ACCT_GROUP_NAME
>  # @DESCRIPTION:
>  # Preferred GID for the new group.  This variable is obligatory, and its
>  # value must be unique across all group packages.
> +#
> +# Overlays should set this to -1 to dynamically allocate GID.  Using -1
> +# in ::gentoo is prohibited by policy.
>
>  # @ECLASS-VARIABLE: ACCT_GROUP_ENFORCE_ID
>  # @DESCRIPTION:
> @@ -87,6 +90,7 @@ acct-group_pkg_pretend() {
>
>  	# verify ACCT_GROUP_ID
>  	[[ -n ${ACCT_GROUP_ID} ]] || die "Ebuild error: ACCT_GROUP_ID must be set!"
> +	[[ ${ACCT_GROUP_ID} -eq -1 ]] && return
>  	[[ ${ACCT_GROUP_ID} -ge 0 ]] || die "Ebuild errors: ACCT_GROUP_ID=${ACCT_GROUP_ID} invalid!"
>
>  	# check for ACCT_GROUP_ID collisions early
> diff --git a/eclass/acct-user.eclass b/eclass/acct-user.eclass
> index 60009643c144..17a58e9126e4 100644
> --- a/eclass/acct-user.eclass
> +++ b/eclass/acct-user.eclass
> @@ -67,6 +67,9 @@ readonly ACCT_USER_NAME
>  # @DESCRIPTION:
>  # Preferred UID for the new user.  This variable is obligatory, and its
>  # value must be unique across all user packages.
> +#
> +# Overlays should set this to -1 to dynamically allocate GID.  Using -1
> +# in ::gentoo is prohibited by policy.
>
>  # @ECLASS-VARIABLE: ACCT_USER_ENFORCE_ID
>  # @DESCRIPTION:
> @@ -279,6 +282,7 @@ acct-user_pkg_pretend() {
>
>  	# verify ACCT_USER_ID
>  	[[ -n ${ACCT_USER_ID} ]] || die "Ebuild error: ACCT_USER_ID must be set!"
> +	[[ ${ACCT_USER_ID} -eq -1 ]] && return
>  	[[ ${ACCT_USER_ID} -ge 0 ]] || die "Ebuild errors: ACCT_USER_ID=${ACCT_USER_ID} invalid!"
>
>  	# check for ACCT_USER_ID collisions early

Pushed now.
-- 
Best regards,
Michał Górny