1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
|
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
<meta http-equiv="Content-Language" content="en" />
<title>s6-rc: the s6-rc-set-change program</title>
<meta name="Description" content="s6-rc: the s6-rc-set-change program" />
<meta name="Keywords" content="s6-rc s6-rc-set-change repo set sub change services" />
<!-- <link rel="stylesheet" type="text/css" href="//skarnet.org/default.css" /> -->
</head>
<body>
<p>
<a href="index.html">s6-rc</a><br />
<a href="//skarnet.org/software/">Software</a><br />
<a href="//skarnet.org/">skarnet.org</a>
</p>
<h1> The s6-rc-set-change program </h1>
<p>
s6-rc-set-change modifies a <a href="repodefs.html#set">set</a> by changing
the <a href="repodefs.html#sub">sub</a> of some services.
</p>
<h2> Interface </h2>
<pre>
s6-rc-set-change [ -v <em>verbosity</em> ] [ -r <em>repo</em> ] [ -E ] [ -f | -I fail|pull|warn ] [ -n ] <em>set</em> <em>newsub</em> <em>services...</em>
</pre>
<ul>
<li> s6-rc-set-change operates on <a href="repodefs.html#set">set</a> <em>set</em> in <a href="repodefs.html#repository">repository</a> <em>repo</em>. </li>
<li> It attempts to move all the services listed in <em>services...</em> into <a href="repodefs.html#sub">sub</a> <em>newsub</em>. </li>
<li> It exits 0. </li>
</ul>
<h2> Options </h2>
<dl>
<dt> -v <em>verbosity</em>, --verbosity=<em>verbosity</em> </dt>
<dd> Be more or less verbose. The default is <strong>1</strong>, which means
that error messages and warnings will be written to stderr. 0 means that only
error messages will be written, and 2 or more adds informational messages. </dd>
<dt> -r <em>repo</em>, --repository=<em>repo</em> </dt>
<dd> Use the repository in <em>repo</em>, which must exist. Default is
<strong>/var/lib/s6-rc/repository</strong>.
</dd>
<dt> -E, --force-essential </dt>
<dd> This option is necessary in order if <em>newsub</em> is <tt>always</tt>.
Without that option, s6-rc-set-change refuses to set services to <tt>always</tt>. </dd>
<dt> -f, --ignore-dependencies </dt>
<dd> Change <em>services...</em> to <em>newsub</em>, but do not change any other
services, even if the dependency graph would normally mandate it. This may result
in an inconsistent set that you cannot commit. </dd>
</dl>
<dt> -I <em>action</em>, --if-dependencies-found=<em>action</em> </dt>
<dd> Determine what to do if a dependency would make the set inconsistent.
For instance, if service <tt>A</tt> depends on service <tt>B</tt>, they are both
in the <tt>latent</tt> sub, and you are trying to change <tt>A</tt> to <tt>active</tt>
without mentioning <tt>B</tt>, this would not work: in order to be brought up at
boot time, <tt>A</tt> would first need <tt>B</tt> to also be brought up at boot time,
so <tt>A</tt> can only be <tt>active</tt> if <tt>B</tt> also is. In that situation,
what s6-rc-set-change does depends on the value of <em>action</em>:
<ul>
<li> <tt>fail</tt>: print an error message and exit 1. </li>
<li> <tt>warn</tt>: print a warning message and proceed. This is the default. </li>
<li> <tt>pull</tt>: print a warning message and pull the dependencies of
<em>services...</em> into <em>newsub</em>. (Or the reverse dependencies, if
you're trying to disable or mask services. </li>
</ul>
The warning messages are not printed if <em>verbosity</em> is 0. </dd>
<dt> -n, --dry-run </dt>
<dd> Check whether the command would succeed, print warning or error messages if
appropriate, but do not perform the actual modifications. </dd>
<h2> Exit codes </h2>
<dl>
<dt> 0 </dt> <dd> Success. </dd>
<dt> 1 </dt> <dd> <tt>-I fail</tt> was given and dependencies prevented <em>services...</em>
from being changed to <em>newsub</em>. </dd>
<dt> 3 </dt> <dd> A service in <em>services...</em> was not found in the reference database. </dt>
<dt> 4 </dt> <dd> Invalid or corrupted reference database. </dd>
<dt> 100 </dt> <dd> Incorrect usage. </dd>
<dt> 102 </dt> <dd> Inconsistent repository. </dd>
<dt> 111 </dt> <dd> System call failed. </dd>
</dl>
<h2> Notes </h2>
<ul>
<li> s6-rc-set-change is the bread and butter of <em>repo</em> operations. It is how users
can tailor the set of services they want to be enabled at boot time. </li>
<li> Once a change has been effected, and the command says that the set is consistent,
it needs to be <a href="s6-rc-set-commit">committed</a>. </li>
</ul>
</body>
</html>
|
