Quoting Dwight Engen (dwight.en...@oracle.com):
> On Thu, 11 Jul 2013 14:48:21 -0500
> Serge Hallyn <serge.hal...@ubuntu.com> wrote:
>
> > lxc-create ... -o -
> >
> > will send template output to standard output (the old default).
> >
> > lxc-create ... without any -o will hide template output.
> >
> > lxc-create -o /tmp/xxx will send template output to the file
> > /tmp/xxx.
>
> I like having a -o for lxc-create, but I'm not sure we should change the
Sorry, that was wrong in my commit msg.
only '--outfile' works (because 'o' is used by the common options for
logfile output)
> default of lxc-create to not show the template output. For interactive
We could swap the meanings so that '--outfile -' means on output, and
not listing '--outfile' shows the output on stdout.
> use it can be quite useful, whereas I think silent certainly makes sense
> for the API (which is what I think Çağlars original concern was).
Oh, hm, yeah. So my approach actually doesn't suffice. I was
thinking callers could do the same thing, but that's somewhat
silly.
> Maybe the API should take fds which we can dup2() onto 0,1,2 of the
> forked create process to handle both cases? (and would allow the API to
> capture the output if so desired)
pass in an int* which is either NULL or contains 3 ints (i.e.
-1, 10, 10 if 10 is an output file)?
> On a related note, I guess we should make sure that all of the
> templates are non-interactive, especially if we're going to give
> them /dev/zero for stdin. Just thought I'd mention it given that the
> ssh one for example was asking for a passphrase until just recently ;)
>
> > Reported-by: "S.Çağlar Onur" <cag...@10ur.org>
> > Signed-off-by: Serge Hallyn <serge.hal...@ubuntu.com>
> > ---
> > src/lxc/arguments.h | 2 +-
> > src/lxc/lxc_create.c | 22 ++++++++++++++++++++++
> > 2 files changed, 23 insertions(+), 1 deletion(-)
> >
> > diff --git a/src/lxc/arguments.h b/src/lxc/arguments.h
> > index 3d1df70..6ab88fc 100644
> > --- a/src/lxc/arguments.h
> > +++ b/src/lxc/arguments.h
> > @@ -81,7 +81,7 @@ struct lxc_arguments {
> > char *fstype;
> > unsigned long fssize;
> > char *lvname, *vgname;
> > - char *zfsroot, *lowerdir, *dir;
> > + char *zfsroot, *lowerdir, *dir, *outfile;
> >
> > /* remaining arguments */
> > char *const *argv;
> > diff --git a/src/lxc/lxc_create.c b/src/lxc/lxc_create.c
> > index 6d8ca01..32805f4 100644
> > --- a/src/lxc/lxc_create.c
> > +++ b/src/lxc/lxc_create.c
> > @@ -68,6 +68,7 @@ static int my_parser(struct lxc_arguments* args,
> > int c, char* arg) case '3': args->fssize = get_fssize(arg); break;
> > case '4': args->zfsroot = arg; break;
> > case '5': args->dir = arg; break;
> > + case '6': args->outfile = arg; break;
> > }
> > return 0;
> > }
> > @@ -82,6 +83,7 @@ static const struct option my_longopts[] = {
> > {"fssize", required_argument, 0, '3'},
> > {"zfsroot", required_argument, 0, '4'},
> > {"dir", required_argument, 0, '5'},
> > + {"outfile", required_argument, 0, '6'},
> > LXC_COMMON_OPTIONS
> > };
> >
> > @@ -134,6 +136,9 @@ Options :\n\
> > --fssize=SIZE Create filesystem of size SIZE\n\
> > (Default: 1G))\n\
> > --dir=DIR Place rootfs directory under DIR\n\
> > + --outfile=FILE Print template output to FILE\n\
> > + Use '-' to indicate stdout\n\
> > + If unspecified, output is hidden\n\
> > --zfsroot=PATH Create zfs under given zfsroot\n\
> > (Default: tank/lxc))\n",
> > .options = my_longopts,
> > @@ -228,6 +233,23 @@ int main(int argc, char *argv[])
> >
> > if (strcmp(my_args.bdevtype, "_unset") == 0)
> > my_args.bdevtype = NULL;
> > +
> > + /* redirect output if requested */
> > + if (!my_args.outfile) {
> > + close(0); close(1); close(2);
> > + open("/dev/zero", O_RDONLY);
> > + open("/dev/null", O_RDWR);
> > + open("/dev/null", O_RDWR);
> > + } else if (strcmp(my_args.outfile, "-") != 0) {
> > + mode_t mode = S_IRUSR | S_IWUSR | S_IRGRP;
> > + close(0); close(1); close(2);
> > + open("/dev/zero", O_RDONLY);
> > + if (open(my_args.outfile, O_RDWR | O_CREAT, mode) <
> > 0 ||
> > + open(my_args.outfile, O_RDWR) < 0) {
> > + SYSERROR("Error opening %s\n",
> > my_args.outfile);
> > + exit(1);
> > + }
> > + }
> > if (!c->create(c, my_args.template, my_args.bdevtype, &spec,
> > &argv[optind])) { ERROR("Error creating container %s", c->name);
> > lxc_container_put(c);
>
------------------------------------------------------------------------------
See everything from the browser to the database with AppDynamics
Get end-to-end visibility with application monitoring from AppDynamics
Isolate bottlenecks and diagnose root cause in seconds.
Start your free trial of AppDynamics Pro today!
http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk
_______________________________________________
Lxc-devel mailing list
Lxc-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/lxc-devel
