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core/execute: set HOME, USER also for root users

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This changes the environment for services running as root from:

LANG=C.utf8
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
INVOCATION_ID=ffbdec203c69499a9b83199333e31555
JOURNAL_STREAM=8:1614518

to

LANG=C.utf8
PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin
HOME=/root
LOGNAME=root
USER=root
SHELL=/bin/sh
INVOCATION_ID=15a077963d7b4ca0b82c91dc6519f87c
JOURNAL_STREAM=8:1616718

Making the environment special for the root user complicates things
unnecessarily. This change simplifies both our logic (by making the setting
of the variables unconditional), and should also simplify the logic in
services (particularly scripts).

Fixes #5124.
This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2017-02-03 09:41:53 -05:00
parent d201d90838
commit 8b89628a10
2 changed files with 2 additions and 7 deletions
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4
man/systemd.exec.xml
View File

@ -1694,9 +1694,7 @@
<term><varname>$SHELL</varname></term>
<listitem><para>User name (twice), home directory, and the
login shell. The variables are set for the units that have
<varname>User=</varname> set, which includes user
<command>systemd</command> instances. See
login shell. See
<citerefentry project='die-net'><refentrytitle>passwd</refentrytitle><manvolnum>5</manvolnum></citerefentry>.
</para></listitem>
</varlistentry>

5
src/core/execute.c
View File

@ -815,13 +815,10 @@ static int get_fixed_user(const ExecContext *c, const char **user,
assert(c);
if (!c->user)
return 0;
/* Note that we don't set $HOME or $SHELL if they are not particularly enlightening anyway
* (i.e. are "/" or "/bin/nologin"). */
name = c->user;
name = c->user ?: "root";
r = get_user_creds_clean(&name, uid, gid, home, shell);
if (r < 0)
return r;