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nixos/ids: explain *why* uids/gids shouldn't be above "399" (#353954)

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Fabián Heredia Montiel 2024-11-06 02:02:55 -06:00 committed by GitHub
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nixos/modules/misc/ids.nix
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@ -356,7 +356,24 @@ in
localtimed = 325;
automatic-timezoned = 326;
# When adding a uid, make sure it doesn't match an existing gid. And don't use uids above 399!
# When adding a uid, make sure it doesn't match an existing gid.
#
# !!! Don't use uids above "399"! !!!
#
# The reason behind this restriction is that, NixOS by default allocates
# system user UIDs/GIDs in the range of `400..999`. System users/groups
# created using command like `useradd` will have UID and GID in this range[1].
#
# If a newly added ID goes beyond "399", it may conflict with existing
# system user or group of the same id in someone else's NixOS.
# This could break their system and make that person upset for a whole day.
#
# Sidenote: the default is defined in `shadow` module[2], and the relavent change
# was made way back in 2014[3].
#
# [1]: https://man7.org/linux/man-pages/man5/login.defs.5.html#:~:text=SYS_UID_MAX%20(number)%2C%20SYS_UID_MIN%20(number)
# [2]: <nixos/modules/programs/shadow.nix>
# [3]: https://github.com/NixOS/nixpkgs/commit/0e23a175de3687df8232fe118cbe87f04228ff28
nixbld = 30000; # start of range of uids
nobody = 65534;
@ -669,7 +686,24 @@ in
# When adding a gid, make sure it doesn't match an existing
# uid. Users and groups with the same name should have equal
# uids and gids. Also, don't use gids above 399!
# uids and gids.
#
# !!! Don't use gids above "399"! !!!
#
# The reason behind this restriction is that, NixOS by default allocates
# system user UIDs/GIDs in the range of `400..999`. System users/groups
# created using command like `useradd` will have UID and GID in this range[1].
#
# If a newly added ID goes beyond "399", it may conflict with existing
# system user or group of the same id in someone else's NixOS.
# This could break their system and make that person upset for a whole day.
#
# Sidenote: the default is defined in `shadow` module[2], and the relavent change
# was made way back in 2014[3].
#
# [1]: https://man7.org/linux/man-pages/man5/login.defs.5.html#:~:text=SYS_UID_MAX%20(number)%2C%20SYS_UID_MIN%20(number)
# [2]: <nixos/modules/programs/shadow.nix>
# [3]: https://github.com/NixOS/nixpkgs/commit/0e23a175de3687df8232fe118cbe87f04228ff28
# For exceptional cases where you really need a gid above 399, leave a
# comment stating why.