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machinectl: extend the "shell" syntax to take user@container names

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In order to make "machinectl shell" more similar to ssh, allow the
following syntax to connect to a container under a specific username:

        machinectl shell lennart@fedora

Also beefs up related man page documentation.
This commit is contained in:
Lennart Poettering 2015-08-24 22:44:54 +02:00
parent 91913f584a
commit ef3100e963
2 changed files with 56 additions and 10 deletions
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40
man/machinectl.xml
View File

@ -403,7 +403,7 @@
</varlistentry>
<varlistentry>
<term><command>shell</command> [<replaceable>NAME</replaceable> [<replaceable>PATH</replaceable> [<replaceable>ARGUMENTS</replaceable>...]]] </term>
<term><command>shell</command> [[<replaceable>NAME</replaceable>@]<replaceable>NAME</replaceable> [<replaceable>PATH</replaceable> [<replaceable>ARGUMENTS</replaceable>...]]] </term>
<listitem><para>Open an interactive shell session in a
container or on the local host. The first argument refers to
@ -415,10 +415,29 @@
immediately invokes a user process. This command runs the
specified executable with the specified arguments, or
<filename>/bin/sh</filename> if none is specified. By default
opens a <literal>root</literal> shell, but using
<option>--uid=</option> a different user may be selected. Use
<option>--setenv=</option> to set environment variables for
the executed process.</para></listitem>
opens a <literal>root</literal> shell, but by using
<option>--uid=</option>, or by prefixing the machine name with
a username and an <literal>@</literal> character, a different
user may be selected. Use <option>--setenv=</option> to set
environment variables for the executed process.</para>
<para>When using the <command>shell</command> command without
arguments (thus invoking the executed shell or command on the
local host) it is similar in many ways to a <citerefentry
project='die-net'><refentrytitle>su</refentrytitle><manvolnum>1</manvolnum></citerefentry>
session, but unlike <command>su</command> completely isolates
the new session from the originating session, so that it
shares no process or session properties, and is in a clean and
well-defined state. It will be tracked in a new utmp, login,
audit and keyring session, and will not inherit an environment
variables or resource limits, among other properties.</para>
<para>Note that the
<citerefentry><refentrytitle>systemd-run</refentrytitle><manvolnum>1</manvolnum></citerefentry>
may be used in place of the <command>shell</command> command,
and allows more detailed, low-level configuration of the
invoked unit. However, it is frequently more privileged than
the <command>shell</command> command.</para></listitem>
</varlistentry>
<varlistentry>
@ -995,6 +1014,17 @@
current directory.</para>
</example>
<example>
<title>Create a new shell session</title>
<programlisting># machinectl shell --uid=lennart</programlisting>
<para>This creates a new shell session on the local host, for
the user ID <literal>lennart</literal>, in a <citerefentry
project='die-net'><refentrytitle>su</refentrytitle><manvolnum>1</manvolnum></citerefentry>-like
fashion.</para>
</example>
</refsect1>
<refsect1>

26
src/machine/machinectl.c
View File

@ -1299,7 +1299,7 @@ static int shell_machine(int argc, char *argv[], void *userdata) {
_cleanup_event_unref_ sd_event *event = NULL;
int master = -1, r;
sd_bus *bus = userdata;
const char *pty, *match, *machine, *path;
const char *pty, *match, *machine, *path, *uid = NULL;
assert(bus);
@ -1319,7 +1319,22 @@ static int shell_machine(int argc, char *argv[], void *userdata) {
if (r < 0)
return log_error_errno(r, "Failed to attach bus to event loop: %m");
machine = argc < 2 || isempty(argv[1]) ? ".host" : argv[1];
machine = argc < 2 || isempty(argv[1]) ? NULL : argv[1];
if (arg_uid)
uid = arg_uid;
else if (machine) {
const char *at;
at = strchr(machine, '@');
if (at) {
uid = strndupa(machine, at - machine);
machine = at + 1;
}
}
if (isempty(machine))
machine = ".host";
match = strjoina("type='signal',"
"sender='org.freedesktop.machine1',"
@ -1344,7 +1359,7 @@ static int shell_machine(int argc, char *argv[], void *userdata) {
path = argc < 3 || isempty(argv[2]) ? NULL : argv[2];
r = sd_bus_message_append(m, "sss", machine, arg_uid, path);
r = sd_bus_message_append(m, "sss", machine, uid, path);
if (r < 0)
return bus_log_create_error(r);
@ -2440,8 +2455,9 @@ static int help(int argc, char *argv[], void *userdata) {
" start NAME... Start container as a service\n"
" login [NAME] Get a login prompt in a container or on the\n"
" local host\n"
" shell [NAME] [COMMAND...] Invoke a shell (or other command) in a container\n"
" or the local host\n"
" shell [[USER@]NAME [COMMAND...]]\n"
" Invoke a shell (or other command) in a container\n"
" or on the local host\n"
" enable NAME... Enable automatic container start at boot\n"
" disable NAME... Disable automatic container start at boot\n"
" poweroff NAME... Power off one or more containers\n"