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escape: add --instance option 

Suggested by @keszybz in #4522.
This commit is contained in:
Lucas Werkmeister 2016-10-30 23:49:15 +01:00
parent e563e2534c
commit d936cddcb5
2 changed files with 38 additions and 3 deletions
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20
man/systemd-escape.xml
View File

@ -80,7 +80,8 @@
<option>--unescape</option>, expects instantiated unit names
for this template and extracts and unescapes just the instance
part. May not be used in conjunction with
<option>--suffix=</option> or
<option>--suffix=</option>,
<option>--instance</option> or
<option>--mangle</option>.</para></listitem>
</varlistentry>
@ -118,6 +119,19 @@
<option>--unescape</option>.</para></listitem>
</varlistentry>
<varlistentry>
<term><option>--instance</option></term>
<listitem><para>With <option>--unescape</option>, unescape
and print only the instance part of an instantiated unit name
template. Results in an error for an uninstantiated template
like <filename>ssh@.service</filename> or a non-template name
like <filename>ssh.service</filename>.
Must be used in conjunction with <option>--unescape</option>
and may not be used in conjunction with
<option>--template</option>.</para></listitem>
</varlistentry>
<xi:include href="standard-options.xml" xpointer="help" />
<xi:include href="standard-options.xml" xpointer="version" />
</variablelist>
@ -144,6 +158,10 @@ tmp-waldi-foobar.mount</programlisting>
systemd-nspawn@My\x20Container\x201.service systemd-nspawn@containerb.service systemd-nspawn@container-III.service</programlisting>
<para>To extract the instance part of an instantiated unit:</para>
<programlisting>$ systemd-escape -u --instance 'systemd-nspawn@My\x20Container\x201.service'
My Container 1</programlisting>
<para>To extract the instance part of an instance of a particular template:</para>
<programlisting>$ systemd-escape -u --template=systemd-nspawn@.service 'systemd-nspawn@My\x20Container\x201.service'
My Container 1</programlisting>
</refsect1>

21
src/escape/escape.c
View File

@ -21,6 +21,7 @@ static enum {
static const char *arg_suffix = NULL;
static const char *arg_template = NULL;
static bool arg_path = false;
static bool arg_instance = false;
static void help(void) {
printf("%s [OPTIONS...] [NAME...]\n\n"
@ -29,6 +30,7 @@ static void help(void) {
" --version Show package version\n"
" --suffix=SUFFIX Unit suffix to append to escaped strings\n"
" --template=TEMPLATE Insert strings as instance into template\n"
" --instance With --unescape, show just the instance part\n"
" -u --unescape Unescape strings\n"
" -m --mangle Mangle strings\n"
" -p --path When escaping/unescaping assume the string is a path\n"
@ -51,6 +53,7 @@ static int parse_argv(int argc, char *argv[]) {
{ "unescape", no_argument, NULL, 'u' },
{ "mangle", no_argument, NULL, 'm' },
{ "path", no_argument, NULL, 'p' },
{ "instance", no_argument, NULL, 'i' },
{}
};
@ -102,6 +105,10 @@ static int parse_argv(int argc, char *argv[]) {
arg_path = true;
break;
case 'i':
arg_instance = true;
break;
case '?':
return -EINVAL;
@ -134,6 +141,16 @@ static int parse_argv(int argc, char *argv[]) {
return -EINVAL;
}
if (arg_instance && arg_action != ACTION_UNESCAPE) {
log_error("--instance must be used in conjunction with --unescape.");
return -EINVAL;
}
if (arg_instance && arg_template) {
log_error("--instance may not be combined with --template.");
return -EINVAL;
}
return 1;
}
@ -197,7 +214,7 @@ int main(int argc, char *argv[]) {
case ACTION_UNESCAPE: {
_cleanup_free_ char *name = NULL;
if (arg_template) {
if (arg_template || arg_instance) {
_cleanup_free_ char *template = NULL;
r = unit_name_to_instance(*i, &name);
@ -215,7 +232,7 @@ int main(int argc, char *argv[]) {
log_error_errno(r, "Failed to extract template: %m");
goto finish;
}
if (!streq(arg_template, template)) {
if (arg_template && !streq(arg_template, template)) {
log_error("Unit %s template %s does not match specified template %s.", *i, template, arg_template);
r = -EINVAL;
goto finish;