[systemd-devel] How to interact with `systemd --user`?

[Ciprian Dorin Craciun]

On Thu, Jun 14, 2012 at 11:27 PM, Kok, Auke-jan H
<auke-jan.h.kok at intel.com> wrote:
> On Thu, Jun 14, 2012 at 1:00 PM, Ciprian Dorin Craciun
> <ciprian.craciun at gmail.com> wrote:
>> On Thu, Jun 14, 2012 at 10:43 PM, Kok, Auke-jan H
>> <auke-jan.h.kok at intel.com> wrote:
>>> On Thu, Jun 14, 2012 at 12:29 PM, Ciprian Dorin Craciun
>>> <ciprian.craciun at gmail.com> wrote:
>>>>    Hello all!
>>>>
>>>>    I want to play a little with systemd, but first I want to use it
>>>> in a "sandbox" user, thus I start it (as non-root) from a console with
>>>>      systemd --log-level=info --default-standard-output=inherit
>>>> --default-standard-error=inherit
>>>
>>> no need for any of those arguments, but, you forgot to add --user:
>>>
>>> $ /usr/lib/systemd/systemd --user
>>
>>    I've tried with `--user` also, but as the documentation says it's
>> able to detect this automatically. Either way still no effect.
>
> perhaps. You can check if it's running with the right DBUS_SESSION_BUS_ADDRESS
> and XDG_RUNTIME_DIR by inspecting `strings /proc/<pid>/environ

    So:
~~~~
dbus-daemon --session --print-address=1 --print-pid=1
systemd --user --log-level=debug --default-standard-output=inherit
--default-standard-error=inherit --unit sleep.service
# (the standard-output and standard-error are required in my case it
seems, and sleep.service contains a simple `/usr/bin/sleep 12s` for
exec, and it works.)
systemctl --user
~~~~
# for systemd process
strings /proc/20590/environ | grep XDG
XDG_DATA_HOME=/home/systemd-tests/.local/share
XDG_CONFIG_DIRS=/etc/xdg
XDG_CONFIG_HOME=/home/systemd-tests/.config
XDG_CACHE_HOME=/home/systemd-tests/.cache
XDG_DATA_DIRS=/usr/local/share/:/usr/share/
XDG_RUNTIME_DIR=/tmp/systemd-tests-run

strings /proc/20590/environ | grep DBUS
DBUS_SESSION_BUS_PID=20555
DBUS_SESSION_BUS_ADDRESS=unix:abstract=/tmp/dbus-xcSICndjkx,guid=e28e135122b7479666f6bdda000032b0

lsof -p 20590
COMMAND   PID          USER   FD      TYPE     DEVICE    SIZE       NODE NAME
...
systemd 20590 systemd-tests    4u     0000        0,8       0
6 anon_inode
systemd 20590 systemd-tests    5u     unix 0xf3fa6f40
132772 @/org/freedesktop/systemd1/notify/2186741763098302303
systemd 20590 systemd-tests    6u     unix 0xf3fa73c0             132773 socket
systemd 20590 systemd-tests    7u     unix 0xf3fa73c0             132773 socket
systemd 20590 systemd-tests    9u     unix 0xf3fa6d00             132774 socket
systemd 20590 systemd-tests   10u     unix 0xf3fa6d00             132774 socket
systemd 20590 systemd-tests   12u     unix 0xf3fa6ac0
132776 /tmp/systemd-tests-run/systemd/private
...
~~~~

    And also:
~~~~
strace -f -v -e process -- systemctl --user
execve("/usr/bin/systemctl", ["systemctl", "--user"],
["XDG_DATA_HOME=/home/systemd-test"..., "SHELL=/bin/bash",
"TERM=screen.rxvt", "DERBY_HOME=/opt/java/db",
"DBUS_SESSION_BUS_PID=20555", "ANT_HOME=/usr/share/apache-ant",
"USER=systemd-tests", "MOZ_PLUGIN_PATH=/usr/lib/mozilla"...,
"MAVEN_OPTS=-Xmx512m", "XDG_CONFIG_DIRS=/etc/xdg",
"PATH=/usr/local/bin:/usr/bin:/bi"..., "HG=/usr/bin/hg",
"LC_COLLATE=C", "PWD=/home/systemd-tests", "JAVA_HOME=/opt/java",
"LANG=en_US.utf8", "SHLVL=1", "HOME=/home/systemd-tests",
"XDG_CONFIG_HOME=/home/systemd-te"...,
"XDG_CACHE_HOME=/home/systemd-tes"..., "LOGNAME=systemd-tests",
"DBUS_SESSION_BUS_ADDRESS=unix:ab"...,
"XDG_DATA_DIRS=/usr/local/share/:"..., "J2SDKDIR=/opt/java",
"GOPATH=/usr/lib/go/site", "XDG_RUNTIME_DIR=/tmp/systemd-tes"...,
"DISPLAY=:0", "J2REDIR=/usr/lib/jvm/java-7-open"...,
"G_BROKEN_FILENAMES=1", "_=/usr/bin/strace"]) = 0
Failed to get D-Bus connection: No connection to service manager.
exit_group(1)                           = ?
+++ exited with 1 +++
~~~~

    As such I don't see what I'm doing wrong...