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nixos/postgresql: run ExecStartPost as an unprivileged user

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This commit is contained in:
Aaron Andersen 2020-08-12 21:06:31 -04:00
parent edd758839c
commit ec82ae3c39
2 changed files with 16 additions and 7 deletions
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10
nixos/doc/manual/release-notes/rl-2009.xml
View file

@ -666,11 +666,19 @@ services.dokuwiki."mywiki" = {
<listitem>
<para>
The <xref linkend="opt-services.postgresql.dataDir"/> option is now set to <literal>"/var/lib/postgresql/${cfg.package.psqlSchema}"</literal> regardless of your
<xref linkend="opt-system.stateVersion"/>. Users with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.09</literal> or below
<xref linkend="opt-system.stateVersion"/>. Users with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.03</literal> or below
should double check what the value of their <xref linkend="opt-services.postgresql.dataDir"/> option is (<literal>/var/db/postgresql</literal>) and then explicitly
set this value to maintain compatibility:
<programlisting>
services.postgresql.dataDir = "/var/db/postgresql";
</programlisting>
</para>
<para>
The postgresql module now expects there to be a database super user account called <literal>postgres</literal> regardless of your <xref linkend="opt-system.stateVersion"/>. Users
with an existing postgresql install that have a <xref linkend="opt-system.stateVersion"/> of <literal>17.03</literal> or below should run the following SQL statements as a
database super admin user before upgrading:
<programlisting>
CREATE ROLE postgres LOGIN SUPERUSER;
</programlisting>
</para>
</listitem>

13
nixos/modules/services/databases/postgresql.nix
View file

@ -225,14 +225,15 @@ in
Contents of the <filename>recovery.conf</filename> file.
'';
};
superUser = mkOption {
type = types.str;
default= if versionAtLeast config.system.stateVersion "17.09" then "postgres" else "root";
default = "postgres";
internal = true;
readOnly = true;
description = ''
NixOS traditionally used 'root' as superuser, most other distros use 'postgres'.
From 17.09 we also try to follow this standard. Internal since changing this value
would lead to breakage while setting up databases.
PostgreSQL superuser account to use for various operations. Internal since changing
this value would lead to breakage while setting up databases.
'';
};
};
@ -336,7 +337,7 @@ in
setupScript = pkgs.writeScript "postgresql-setup" (''
#!${pkgs.runtimeShell} -e
PSQL="${pkgs.utillinux}/bin/runuser -u ${cfg.superUser} -- psql --port=${toString cfg.port}"
PSQL="psql --port=${toString cfg.port}"
while ! $PSQL -d postgres -c "" 2> /dev/null; do
if ! kill -0 "$MAINPID"; then exit 1; fi
@ -362,7 +363,7 @@ in
'') cfg.ensureUsers}
'');
in
"+${setupScript}";
"${setupScript}";
}
(mkIf (cfg.dataDir == "/var/lib/postgresql/${cfg.package.psqlSchema}") {
StateDirectory = "postgresql postgresql/${cfg.package.psqlSchema}";