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Implement argp support for walk-inodes

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This has some fancy parsing going on, and I decided to just leave it
in the main function instead of going to the effort to move it all
to the parsing function.

Signed-off-by: Andy Grover <agrover@versity.com>
This commit is contained in:
Andy Grover
2021-01-12 16:29:42 -08:00
parent 97c6cc559e
commit f2cd1003f6
1 changed files with 77 additions and 21 deletions
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utils/src/walk_inodes.c
+77 -21
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@@ -8,8 +8,10 @@
#include <errno.h>
#include <string.h>
#include <limits.h>
#include <argp.h>
#include "sparse.h"
#include "parse.h"
#include "util.h"
#include "format.h"
#include "ioctl.h"
@@ -66,7 +68,14 @@ static int parse_walk_entry(struct scoutfs_ioctl_walk_inodes_entry *ent,
return 0;
}
static int walk_inodes_cmd(int argc, char **argv)
struct walk_inodes_args {
char *path;
char *index;
char *first_entry;
char *last_entry;
};
static int do_walk_inodes(struct walk_inodes_args *args)
{
struct scoutfs_ioctl_walk_inodes_entry ents[128];
struct scoutfs_ioctl_walk_inodes walk;
@@ -75,44 +84,35 @@ static int walk_inodes_cmd(int argc, char **argv)
int fd;
int i;
if (argc != 5) {
fprintf(stderr, "must specify seq and path\n");
return -EINVAL;
}
if (!strcasecmp(argv[1], "meta_seq"))
if (!strcasecmp(args->index, "meta_seq"))
walk.index = SCOUTFS_IOC_WALK_INODES_META_SEQ;
else if (!strcasecmp(argv[1], "data_seq"))
else if (!strcasecmp(args->index, "data_seq"))
walk.index = SCOUTFS_IOC_WALK_INODES_DATA_SEQ;
else {
fprintf(stderr, "unknown index '%s', try 'meta_seq' or "
"'data_seq'\n", argv[1]);
"'data_seq'\n", args->index);
return -EINVAL;
}
ret = parse_walk_entry(&walk.first, argv[2]);
ret = parse_walk_entry(&walk.first, args->first_entry);
if (ret) {
fprintf(stderr, "invalid first position '%s', try '1.2.3' or "
"'-1'\n", argv[2]);
"'-1'\n", args->first_entry);
return -EINVAL;
}
ret = parse_walk_entry(&walk.last, argv[3]);
ret = parse_walk_entry(&walk.last, args->last_entry);
if (ret) {
fprintf(stderr, "invalid last position '%s', try '1.2.3' or "
"'-1'\n", argv[3]);
"'-1'\n", args->last_entry);
return -EINVAL;
}
fd = open(argv[4], O_RDONLY);
if (fd < 0) {
ret = -errno;
fprintf(stderr, "failed to open '%s': %s (%d)\n",
argv[4], strerror(errno), errno);
return ret;
}
fd = get_path(args->path, O_RDONLY);
if (fd < 0)
return fd;
walk.entries_ptr = (unsigned long)ents;
walk.nr_entries = array_size(ents);
@@ -149,8 +149,64 @@ static int walk_inodes_cmd(int argc, char **argv)
return ret;
};
static int walk_inodes_parse_opt(int key, char *arg, struct argp_state *state)
{
struct walk_inodes_args *args = state->input;
switch (key) {
case 'p':
args->path = strdup_or_error(state, arg);
break;
case ARGP_KEY_ARG:
if (!args->index)
args->index = strdup_or_error(state, arg);
else if (!args->first_entry)
args->first_entry = strdup_or_error(state, arg);
else if (!args->last_entry)
args->last_entry = strdup_or_error(state, arg);
else
argp_error(state, "more than three arguments given");
break;
case ARGP_KEY_FINI:
if (!args->index)
argp_error(state, "no index given");
if (!args->first_entry)
argp_error(state, "no first entry given");
if (!args->last_entry)
argp_error(state, "no last entry given");
break;
default:
break;
}
return 0;
}
static struct argp_option options[] = {
{ "path", 'p', "PATH", 0, "Path to ScoutFS filesystem"},
{ NULL }
};
static int walk_inodes_cmd(int argc, char **argv)
{
struct argp argp = {
options,
walk_inodes_parse_opt,
"<meta_seq|data_seq> FIRST-ENTRY LAST-ENTRY"
};
struct walk_inodes_args walk_inodes_args = {NULL};
int ret;
ret = argp_parse(&argp, argc, argv, 0, NULL, &walk_inodes_args);
if (ret)
return ret;
return do_walk_inodes(&walk_inodes_args);
}
static void __attribute__((constructor)) walk_inodes_ctor(void)
{
cmd_register("walk-inodes", "<index> <first> <last> <path>",
cmd_register("walk-inodes", "<index> <first> <last>",
"print range of indexed inodes", walk_inodes_cmd);
}