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lxc-wait: Add timeout option

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Allow to specify a timeout for waiting on state changes via lxc-wait.
Helpful for scripts that need to handle errors or excessive delays in
state changing procedures.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Jan Kiszka 2012-08-09 17:54:48 -05:00 committed by Stéphane Graber
parent 4aa7ac3569
commit b486346aa2
3 changed files with 27 additions and 1 deletions
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11
doc/lxc-wait.sgml.in
View File

@ -79,6 +79,17 @@ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
</listitem>
</varlistentry>
<varlistentry>
<term>
<option>-t <replaceable>timeout</replaceable></option>
</term>
<listitem>
<para>
Wait timeout seconds for desired state to be reached.
</para>
</listitem>
</varlistentry>
</variablelist>
</refsect1>

1
src/lxc/arguments.h
View File

@ -57,6 +57,7 @@ struct lxc_arguments {
/* for lxc-wait */
char *states;
long timeout;
/* close fds from parent? */
int close_all_fds;

16
src/lxc/lxc_wait.c
View File

@ -24,6 +24,8 @@
#include <string.h>
#include <libgen.h>
#include <unistd.h>
#include <stdlib.h>
#include <signal.h>
#include <sys/types.h>
#include <lxc/lxc.h>
@ -46,12 +48,14 @@ static int my_parser(struct lxc_arguments* args, int c, char* arg)
{
switch (c) {
case 's': args->states = optarg; break;
case 't': args->timeout = atol(optarg); break;
}
return 0;
}
static const struct option my_longopts[] = {
{"state", required_argument, 0, 's'},
{"timeout", required_argument, 0, 't'},
LXC_COMMON_OPTIONS
};
@ -66,7 +70,8 @@ Options :\n\
-n, --name=NAME NAME for name of the container\n\
-s, --state=STATE ORed states to wait for\n\
STOPPED, STARTING, RUNNING, STOPPING,\n\
ABORTING, FREEZING, FROZEN\n",
ABORTING, FREEZING, FROZEN\n\
-t, --timeout=TMO Seconds to wait for state changes\n",
.options = my_longopts,
.parser = my_parser,
.checker = my_checker,
@ -91,6 +96,11 @@ static int fillwaitedstates(char *strstates, int *states)
return 0;
}
static void timeout_handler(int signal)
{
exit(-1);
}
int main(int argc, char *argv[])
{
struct lxc_msg msg;
@ -124,6 +134,9 @@ int main(int argc, char *argv[])
goto out_close;
}
signal(SIGALRM, timeout_handler);
alarm(my_args.timeout);
for (;;) {
if (lxc_monitor_read(fd, &msg) < 0)
goto out_close;
@ -140,6 +153,7 @@ int main(int argc, char *argv[])
}
if (s[msg.value]) {
alarm(0);
ret = 0;
goto out_close;
}