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authorZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-10-20 23:41:21 -0400
committerZbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl>2016-10-26 20:12:51 -0400
commit299a34c11a4241f8c5832ccd5a7bc13263f8488b (patch)
treef67f997d142debec99297a095f4687f65bf7c00e /man/systemd-detect-virt.xml
parent24597ee0e626b61f134e09b4e871449ef86b1343 (diff)
detect-virt: add --private-users switch to check if a userns is active
Various things don't work when we're running in a user namespace, but it's pretty hard to reliably detect if that is true. A function is added which looks at /proc/self/uid_map and returns false if the default "0 0 UINT32_MAX" is found, and true if it finds anything else. This misses the case where an 1:1 mapping with the full range was used, but I don't know how to distinguish this case. 'systemd-detect-virt --private-users' is very similar to 'systemd-detect-virt --chroot', but we check for a user namespace instead.
Diffstat (limited to 'man/systemd-detect-virt.xml')
-rw-r--r--man/systemd-detect-virt.xml16
1 files changed, 14 insertions, 2 deletions
diff --git a/man/systemd-detect-virt.xml b/man/systemd-detect-virt.xml
index 61a5f8937f..996c2fa256 100644
--- a/man/systemd-detect-virt.xml
+++ b/man/systemd-detect-virt.xml
@@ -50,7 +50,8 @@
<refsynopsisdiv>
<cmdsynopsis>
- <command>systemd-detect-virt <arg choice="opt" rep="repeat">OPTIONS</arg></command>
+ <command>systemd-detect-virt</command>
+ <arg choice="opt" rep="repeat">OPTIONS</arg>
</cmdsynopsis>
</refsynopsisdiv>
@@ -218,6 +219,16 @@
</varlistentry>
<varlistentry>
+ <term><option>--private-users</option></term>
+
+ <listitem><para>Detect whether invoked in a user namespace. In this mode, no
+ output is written, but the return value indicates whether the process was invoked
+ inside of a user namespace or not. See
+ <citerefentry project='man-pages'><refentrytitle>user_namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>
+ for more information.</para></listitem>
+ </varlistentry>
+
+ <varlistentry>
<term><option>-q</option></term>
<term><option>--quiet</option></term>
@@ -243,7 +254,8 @@
<para>
<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
<citerefentry><refentrytitle>systemd-nspawn</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>2</manvolnum></citerefentry>
+ <citerefentry><refentrytitle>chroot</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
+ <citerefentry project='man-pages'><refentrytitle>namespaces</refentrytitle><manvolnum>7</manvolnum></citerefentry>
</para>
</refsect1>