Date: Wed, 19 Dec 2012 17:21:40 -0600 From: Brooks Davis <brooks@FreeBSD.org> To: Mark Johnston <markjdb@gmail.com> Cc: Ian Lepore <freebsd@damnhippie.dyndns.org>, "src-committers@freebsd.org" <src-committers@FreeBSD.org>, d@delphij.net, Jilles Tjoelker <jilles@stack.nl>, Garrett Cooper <yanegomi@gmail.com>, "svn-src-all@freebsd.org" <svn-src-all@FreeBSD.org>, Alfred Perlstein <bright@mu.org>, Xin LI <delphij@FreeBSD.org>, "svn-src-head@freebsd.org" <svn-src-head@FreeBSD.org>, Andrey Zonov <zont@FreeBSD.org> Subject: Re: svn commit: r244198 - in head: etc/rc.d sbin/sysctl Message-ID: <20121219232140.GA40927@lor.one-eyed-alien.net> In-Reply-To: <20121219225854.GA8399@oddish> References: <1355931456.1198.203.camel@revolution.hippie.lan> <05CC5BAD-B968-4A7A-8097-A3344D970D63@mu.org> <1355932607.1198.206.camel@revolution.hippie.lan> <F158CD10-B65B-4BBA-BCAD-6A52BC5C8FDF@mu.org> <50D2128A.7030205@delphij.net> <20121219210418.GA83983@stack.nl> <CAGH67wRTdBCZLq1R8-yqD6EBZ%2B=F228-0o_8TvU3b0KZD6vUfg@mail.gmail.com> <CAGH67wT1L_9ia7-hdHST6q8iCdtmFifZcHixCQhBTiZEH8YAcw@mail.gmail.com> <50D23961.7090803@delphij.net> <20121219225854.GA8399@oddish>
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On Wed, Dec 19, 2012 at 05:58:54PM -0500, Mark Johnston wrote:
> On Wed, Dec 19, 2012 at 02:02:09PM -0800, Xin Li wrote:
> > -----BEGIN PGP SIGNED MESSAGE-----
> > Hash: SHA256
> >=20
> > On 12/19/12 13:12, Garrett Cooper wrote:
> > > On Wed, Dec 19, 2012 at 1:10 PM, Garrett Cooper
> > > <yanegomi@gmail.com> wrote:
> > >=20
> > > ...
> > >=20
> > >> find -exec / echo | xargs ? Seems like there's a better way to
> > >> solve this.
> > >=20
> > > Of course we also might be overengineering the problem (my=20
> > > suggestion definitely was overengineered). Why not pass in the=20
> > > appropriate arguments via sysctl_args in /etc/rc.conf ? Thanks,
> >=20
> > Irrelevant. Consider this (extreme) situation: someone distributes
> > several sets of sysctl values tuned for certain situations, like
> > tcp.conf, supermicro.conf, ... and wants to put them together in a
> > directory, it's useful to source from the directory without having to
> > do a generation of command line on boot, so when something goes wrong,
> > they just remove the pack rather than changing /etc/rc.conf.
>=20
> At work I've changed the -f flag of syslogd and newsyslog to accept a
> directory which gets non-recursively searched for input files. This way
> we can have a directory, say /etc/syslog.d, into which package install
> scripts can easily drop config files.
>=20
> For something like sysctl this might be a bit much, but it's just a
> thought. The example diff below is what I have in mind.
I don't have a strong opinion about the usefulness of this feature. It
seems useful particularly in conjunction with supporting multiple -f's.
I do have a few comments on the implementation below.
> -Mark
>=20
> diff --git a/sbin/sysctl/sysctl.c b/sbin/sysctl/sysctl.c
> index 8fad089..c880b45 100644
> --- a/sbin/sysctl/sysctl.c
> +++ b/sbin/sysctl/sysctl.c
> @@ -42,6 +42,7 @@ static const char rcsid[] =3D
> #endif /* not lint */
> =20
> #include <sys/param.h>
> +#include <sys/types.h>
> #include <sys/time.h>
> #include <sys/resource.h>
> #include <sys/stat.h>
> @@ -49,6 +50,7 @@ static const char rcsid[] =3D
> #include <sys/vmmeter.h>
> =20
> #include <ctype.h>
> +#include <dirent.h>
> #include <err.h>
> #include <errno.h>
> #include <inttypes.h>
> @@ -64,6 +66,7 @@ static const char *conffile;
> static int aflag, bflag, dflag, eflag, hflag, iflag;
> static int Nflag, nflag, oflag, qflag, Tflag, Wflag, xflag;
> =20
> +static int handlefile(const char *);
> static int oidfmt(int *, int, char *, u_int *);
> static int parsefile(const char *);
> static int parse(const char *, int);
> @@ -165,7 +168,7 @@ main(int argc, char **argv)
> =20
> warncount =3D 0;
> if (conffile !=3D NULL)
> - warncount +=3D parsefile(conffile);
> + warncount +=3D handlefile(conffile);
> =20
> while (argc-- > 0)
> warncount +=3D parse(*argv++, 0);
> @@ -402,6 +405,48 @@ parse(const char *string, int lineno)
> }
> =20
> static int
> +handlefile(const char *filename)
> +{
> + DIR *dir;
> + struct dirent *de;
> + struct stat sb;
> + char path[MAXPATHLEN], *fname;
> + size_t off;
> + int warncount =3D 0;
> +
> + if (stat(filename, &sb))
> + err(EX_NOINPUT, "%s", filename);
I'd open the file and then use fstat here. You will need to open it one
way or another and there's no point it checking it's type if you can't.
> + if (S_ISREG(sb.st_mode)) {
> + return (parsefile(filename));
> + } else if (!S_ISDIR(sb.st_mode))
> + errx(EX_USAGE, "invalid input file '%s'", filename);
> +
> + dir =3D opendir(filename);
With the above suggestion, this would become just use fdopendir() here.
> + if (dir =3D=3D NULL)
> + err(EX_NOINPUT, "%s", filename);
> + off =3D strlcpy(path, filename, sizeof(path) - 1);
> + if (off >=3D sizeof(path) - 1)
> + errx(EX_NOINPUT, "input path '%s' too long", filename);
> +
> + fname =3D path + off;
> + *fname++ =3D '/';
> + off++;
> + while ((de =3D readdir(dir)) !=3D NULL) {
Per other's suggestions I would probably only read .conf files. A
simple fnmatch() will let you do that.
> + strlcpy(fname, de->d_name, sizeof(path) - off);
Rather than doing string manipulation, use openat() here to open the
files in the directory.
> + if (stat(path, &sb)) {
> + warn("%s", path);
> + continue;
> + } else if (!S_ISREG(sb.st_mode))
> + continue;
> +
> + warncount +=3D parsefile(path);
> + }
> + closedir(dir);
> +
> + return (warncount);
> +}
> +
> +static int
> parsefile(const char *filename)
Alter to take a file descriptor instead of a path.
-- Brooks
> {
> FILE *file;
>=20
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