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Allow GEOM utilities to specify a -v option.

Browse source 
Geom utilities (geli(8), glabel(8), gmirror(8), gpart(8), gmirror(8),
gmountver(8), etc) all use the geom(8) utility as their back end
to process their commands and pass them into the kernel. Creating
a new utility requires no more than filling out a template describing
the commands and arguments that the utility supports. Consider the
specification for the very simple gmountver(8) utility:

struct g_command class_commands[] = {
	{ "create", G_FLAG_VERBOSE | G_FLAG_LOADKLD, NULL,
	    {
		G_OPT_SENTINEL
	    },
	    "[-v] prov ..."
	},
	{ "destroy", G_FLAG_VERBOSE, NULL,
	    {
		{ 'f', "force", NULL, G_TYPE_BOOL },
		G_OPT_SENTINEL
	    },
	    "[-fv] name"
	},
	G_CMD_SENTINEL
};

It has just two commands of its own: "create" and "destroy" along
with the four standard commands "list", "status", "load", and
"unload" provided by the base geom(8) utility. The base geom(8)
utility allows each command to use the G_FLAG_VERBOSE flag to specify
that a command should accept the -v flag and when the -v flag is
given the utility prints "Done." if the command completes successfully.
In the above example, both of the commands set the G_FLAG_VERBOSE,
so have the -v option available. In addition the "destroy" command
accepts the -f boolean flag to force the destruction.

If the "destroy" command wanted to also print out verbose information,
it would need to explicitly declare its intent by adding a line:

		{ 'v', "verbose", NULL, G_TYPE_BOOL },

Before this change, the geom utility would silently ignore the above
line in the configuration file, so it was impossible for the utility
to know that the -v flag had been set on the command. With this
change a geom command can explicitly specify a -v option with a
line as given above and handle it as it would any other option. If
both a -v option and G_FLAG_VERBOSE are specified for a command
then both types of verbose information will be output when that
command is run with -v.

MFC after:    1 week
Sponsored by: Netflix
This commit is contained in:
Kirk McKusick 2021-10-28 22:49:48 -07:00
parent a30e8044aa
commit 68bff4a07e
2 changed files with 25 additions and 7 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
sbin/geom/core/geom.c
View file

@ -314,7 +314,7 @@ parse_arguments(struct g_command *cmd, struct gctl_req *req, int *argc,
struct g_option *opt;
char opts[64];
unsigned i;
int ch;
int ch, vcount;
*opts = '\0';
if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0)
@ -336,17 +336,22 @@ parse_arguments(struct g_command *cmd, struct gctl_req *req, int *argc,
/*
* Add specified arguments.
*/
vcount = 0;
while ((ch = getopt(*argc, *argv, opts)) != -1) {
/* Standard (not passed to kernel) options. */
switch (ch) {
case 'v':
if (ch == 'v' && (cmd->gc_flags & G_FLAG_VERBOSE) != 0)
verbose = 1;
continue;
}
/* Options passed to kernel. */
opt = find_option(cmd, ch);
if (opt == NULL)
if (opt == NULL) {
if (ch == 'v' && (cmd->gc_flags & G_FLAG_VERBOSE) != 0){
if (++vcount < 2)
continue;
else
warnx("Option 'v' specified twice.");
}
usage();
}
if (!G_OPT_ISMULTI(opt) && G_OPT_ISDONE(opt)) {
warnx("Option '%c' specified twice.", opt->go_char);
usage();
@ -440,7 +445,7 @@ set_flags(struct g_command *cmd)
{
unsigned flags = 0;
if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0 && verbose)
if ((cmd->gc_flags & G_FLAG_VERBOSE) != 0)
flags |= G_FLAG_VERBOSE;
return (flags);

13
sbin/geom/core/geom.h
View file

@ -32,6 +32,19 @@
#define _GEOM_H_
#define G_LIB_VERSION 5
/*
* The G_FLAG_VERBOSE flag on a command specification means that the
* comand will accept a -v option and the GEOM framework will print
* out status information after the command when it is run with -v.
* Additionally a GEOM command can explicitly specify a -v option and
* handle it as it would any other option. If both a -v option and
* G_FLAG_VERBOSE are specified for a command then both types of verbose
* information will be output when that command is run with -v.
*
* When the G_FLAG_LOADKLD is specified for a command, the GEOM kernel
* module will be loaded when that command is run if it has not yet been
* loaded. This flag is typically specified for the `create' command.
*/
#define G_FLAG_NONE 0x0000
#define G_FLAG_VERBOSE 0x0001
#define G_FLAG_LOADKLD 0x0002