[systemd-devel] UMask attribute in service file

[Oliver Graute]

Hello list,

I'am using the UMask attribute in my service file to define my umask
setting to 0027. In this service file I start a little c program which uses
fopen() to open a file.

the file permissions are

rw-rw-rw (0666)

instead of

rw-r--- (0640)

Is this a expected behavior?

some further background:

In my system there are different services started by systemd 225 (all
with UMask=027). Sometimes files are created with 666 sometimes with
640 as I wish.

ls -la
-rw-r-----    1 oliver     oliver            75 Jan 11 17:30 log_20170111_163024_2.log
-rw-rw-rw-    1 oliver     oliver            75 Jan 11 17:30 log_20170111_163024_3.log
-rw-rw-rw-    1 oliver     oliver            75 Jan 11 17:36 log_20170111_163610_1.log
-rw-r-----    1 oliver     oliver            75 Jan 31 13:38 log_20170131_123842_1.log
-rw-r-----    1 oliver     oliver            75 Jan 31 13:57 log_20170131_125738_2.log

some clue whats going one here?

here my stub service definition:

[Unit]
Description=Start umask_test

[Service]
Type=simple
PIDFile=/var/run/umasktest.pid
WorkingDirectory=/home/oliver
User=oliver
Group=oliver
UMask=0027
Environment=
ExecStart=/home/oliver/umask_test

Best Regards,

Oliver