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unit-printf: add specifiers for the host name, machine id, boot id

This commit is contained in:
Lennart Poettering 2012-09-18 11:53:47 +02:00
parent 3ef63c3174
commit 6569cae18e
3 changed files with 64 additions and 2 deletions
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2
TODO
View File

@ -62,8 +62,6 @@ Features:
* journald: add kernel cmdline option to disable ratelimiting for debug purposes
* Add a way to reference the machine/boot ID from ExecStart= and similar command lines
* move PID 1 segfaults to /var/lib/systemd/coredump?
* Document word splitting syntax for ExecStart= and friends

15
man/systemd.unit.xml
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@ -273,6 +273,21 @@
<entry>User shell</entry>
<entry>This is the shell of the configured user of the unit, or (if none is set) the user running the systemd instance.</entry>
</row>
<row>
<entry><literal>%m</literal></entry>
<entry>Machine ID</entry>
<entry>The machine ID of the running system, formatted as string. See <citerefentry><refentrytitle>machine-id</refentrytitle><manvolnum>5</manvolnum></citerefentry> for more information.</entry>
</row>
<row>
<entry><literal>%b</literal></entry>
<entry>Boot ID</entry>
<entry>The boot ID of the running system, formatted as string. See <citerefentry><refentrytitle>random</refentrytitle><manvolnum>4</manvolnum></citerefentry> for more information.</entry>
</row>
<row>
<entry><literal>%H</literal></entry>
<entry>Host name</entry>
<entry>The host name of the running system.</entry>
</row>
</tbody>
</tgroup>
</table>

49
src/core/unit-printf.c
View File

@ -124,6 +124,8 @@ static char *specifier_user_name(char specifier, void *data, void *userdata) {
int r;
const char *username;
assert(u);
c = unit_get_exec_context(u);
if (!c)
return NULL;
@ -147,6 +149,8 @@ static char *specifier_user_home(char specifier, void *data, void *userdata) {
int r;
const char *username, *home;
assert(u);
c = unit_get_exec_context(u);
if (!c)
return NULL;
@ -176,6 +180,8 @@ static char *specifier_user_shell(char specifier, void *data, void *userdata) {
int r;
const char *username, *shell;
assert(u);
c = unit_get_exec_context(u);
if (!c)
return NULL;
@ -199,6 +205,42 @@ static char *specifier_user_shell(char specifier, void *data, void *userdata) {
return strdup(shell);
}
static char *specifier_machine_id(char specifier, void *data, void *userdata) {
sd_id128_t id;
char *buf;
int r;
r = sd_id128_get_machine(&id);
if (r < 0)
return NULL;
buf = new(char, 33);
if (!buf)
return NULL;
return sd_id128_to_string(id, buf);
}
static char *specifier_boot_id(char specifier, void *data, void *userdata) {
sd_id128_t id;
char *buf;
int r;
r = sd_id128_get_boot(&id);
if (r < 0)
return NULL;
buf = new(char, 33);
if (!buf)
return NULL;
return sd_id128_to_string(id, buf);
}
static char *specifier_host_name(char specifier, void *data, void *userdata) {
return gethostname_malloc();
}
char *unit_name_printf(Unit *u, const char* format) {
/*
@ -238,6 +280,9 @@ char *unit_full_printf(Unit *u, const char *format) {
* %u the username of the configured user or running user
* %h the homedir of the configured user or running user
* %s the shell of the configured user or running user
* %m the machine ID of the running system
* %b the boot ID of the running system
* %H the host name of the running system
*/
const Specifier table[] = {
@ -256,6 +301,10 @@ char *unit_full_printf(Unit *u, const char *format) {
{ 'u', specifier_user_name, NULL },
{ 'h', specifier_user_home, NULL },
{ 's', specifier_user_shell, NULL },
{ 'm', specifier_machine_id, NULL },
{ 'H', specifier_host_name, NULL },
{ 'b', specifier_boot_id, NULL },
{ 0, NULL, NULL }
};