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<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW - Instance variable %i not available for (Inaccessible|Read(Only|Write)Directories)"
href="https://bugs.freedesktop.org/show_bug.cgi?id=89875">89875</a>
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<th>Summary</th>
<td>Instance variable %i not available for (Inaccessible|Read(Only|Write)Directories)
</td>
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<th>Product</th>
<td>systemd
</td>
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<th>Version</th>
<td>unspecified
</td>
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<th>Hardware</th>
<td>All
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<th>OS</th>
<td>All
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<th>Status</th>
<td>NEW
</td>
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<th>Severity</th>
<td>enhancement
</td>
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<th>Priority</th>
<td>medium
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<th>Component</th>
<td>general
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<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
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<th>Reporter</th>
<td>berni@birkenwald.de
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<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
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<p>
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<pre>We're trying to run multiple DHCP processes on one system. They have
their data in a instance-specific configuration directory and we'd like
to limit (r/w for now) filesystem access to that directory for security
reasons.
==> dhcpd@.service <==
[Unit]
Description=DHCP Instance %i
After=syslog.target
After=network.target
[Service]
ExecStart=/usr/sbin/dhcpd -cf /var/lib/dhcp/%i/etc/dhcpd.conf -lf
/var/lib/dhcp/%i/db/dhcpd.leases -pf /var/lib/dhcp/%i/dhcpd.pid -f
Type=simple
Restart=on-failure
CapabilityBoundingSet=CAP_NET_RAW CAP_NET_BIND_SERVICE
NoNewPrivileges=true
ReadOnlyDirectories=/
ReadWriteDirectories=/var/lib/dhcp/%i
This does not work
Apr 02 11:02:38 dns-w-neu systemd[1]: Started DHCP Instance b1peer2.
Apr 02 11:02:38 dns-w-neu systemd[1]: Starting DHCP Instance b1peer2...
Apr 02 11:02:38 dns-w-neu systemd[7760]: Failed at step NAMESPACE
spawning /usr/sbin/dhcpd: No such file or directory
Apr 02 11:02:38 dns-w-neu systemd[1]: <a href="mailto:dhcpd@b1peer2.service">dhcpd@b1peer2.service</a>: main
process exited, code=exited, status=226/NAMESPACE
Apr 02 11:02:38 dns-w-neu systemd[1]: Unit <a href="mailto:dhcpd@b1peer2.service">dhcpd@b1peer2.service</a> entered
failed state.
Apr 02 11:02:38 dns-w-neu systemd[1]: <a href="mailto:dhcpd@b1peer2.service">dhcpd@b1peer2.service</a> failed.
Apr 02 11:02:38 dns-w-neu systemd[1]: <a href="mailto:dhcpd@b1peer2.service">dhcpd@b1peer2.service</a> holdoff time
over, scheduling restart.
The directory exists
root@dns-w-neu:/var/lib/dhcp# ls -lad b1peer2
drwxr-xr-x 4 root root 4096 Apr 1 16:40 b1peer2
it works fine with either
ReadWriteDirectories=/var/lib/dhcp
and
ReadWriteDirectories=/var/lib/dhcp/b1peer2
(which obviously won't work with other instances, but that's not the
point here).
So it seems that %i is not evaluated in ReadWriteDirectories (at least).</pre>
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