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#include <string.h>
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <sys/statvfs.h>
#include <sys/stat.h>
#include "../block.h"
#include "../format.h"
#include "../any_log.h"
typedef struct {
block_text_t block;
format_t format;
char *path;
} block_fs_t;
typedef enum {
FS_STRING = 0,
FS_TOTAL,
FS_FREE,
FS_USED,
FS_FREE_PERC,
FS_USED_PERC,
} block_fs_mark_t;
static const format_option_t block_fs_options[] = {
{ { "total", FS_TOTAL } },
{ { "free", FS_FREE } },
{ { "used", FS_USED } },
{ { "free-percentage", FS_FREE_PERC } },
{ { "used-percentage", FS_USED_PERC } },
{ { NULL } },
};
static const struct timespec block_fs_interval = {
.tv_sec = 20,
.tv_nsec = 0,
};
static void block_fs_update(block_t *block)
{
block_fs_t *fs = (block_fs_t *)block;
struct statvfs sbuf;
if (statvfs(fs->path, &sbuf) < 0) {
log_value_debug("Failed to read filesystem",
"s:label", block->label,
"s:path", fs->path,
"i:errno", errno);
return;
}
char buffer[256] = { 0 };
size_t start = 0, size = sizeof(buffer);
for (size_t i = 0; i < fs->format.length; i++) {
size_t rest = start >= size ? 0 : size - start;
if (rest == 0) break;
switch (fs->format.parts[i].mark) {
case FS_STRING:
start += snprintf(buffer + start, rest, "%s", fs->format.parts[i].string);
break;
case FS_TOTAL:
start += snprintf(buffer + start, rest, "%ld", sbuf.f_bsize * (uint64_t)sbuf.f_blocks);
break;
case FS_FREE:
start += snprintf(buffer + start, rest, "%ld", sbuf.f_bsize * (uint64_t)sbuf.f_bavail);
break;
case FS_USED:
start += snprintf(buffer + start, rest, "%ld", sbuf.f_bsize * (sbuf.f_blocks - sbuf.f_bavail));
break;
case FS_FREE_PERC:
start += snprintf(buffer + start, rest, "%ld", (100 * sbuf.f_bavail) / sbuf.f_blocks);
break;
case FS_USED_PERC:
start += snprintf(buffer + start, rest, "%ld", (100 * (sbuf.f_blocks - sbuf.f_bavail)) / sbuf.f_blocks);
break;
default:
unreachable();
}
}
free(fs->block.text);
fs->block.text = strcopy(buffer);
assert(fs->block.text != NULL);
}
static block_t *block_fs_alloc(const block_scheme_t *scheme)
{
block_t *block = calloc(1, sizeof(block_fs_t));
block->type = BLOCK_TEXT;
block->update_interval = block_fs_interval;
block->update_fn = block_fs_update;
return block;
}
static void block_fs_clean(block_t *block)
{
block_fs_t *fs = (block_fs_t *)block;
format_free(&fs->format);
free(fs->path);
free(fs->block.text);
}
static bool block_fs_validate(block_t *block, const block_scheme_t *scheme)
{
block_fs_t *fs = (block_fs_t *)block;
if (fs->block.text == NULL) {
log_error("Block '%s' requires key '%s'", block->label, "text");
return false;
}
if (!format_init(&fs->format, fs->block.text, '%')) {
log_error("Block '%s' has an invalid format", block->label);
return false;
}
int marked = format_remark(&fs->format, block->label, block_fs_options);
if (marked < 0)
return false;
if (marked == 0) {
log_warn("Block '%s' does not use any fs option", block->label);
block->update_fn = NULL;
log_debug("Disabled updates for block '%s'", block->label);
return true;
}
struct stat sbuf;
if (fs->path == NULL || stat(fs->path, &sbuf) < 0) {
log_trace("Failed to read file '%s': %s", fs->path, strerror(errno));
log_error("Block '%s' was given an invalid path '%s'", block->label, fs->path);
return false;
}
return true;
}
static const config_entry_t block_fs_entries[] = {
{ "path", CONFIG_STRING, NULL, offsetof(block_fs_t, path) },
{ 0 },
};
const block_scheme_t block_fs_scheme = {
.name = "fs",
.entries = block_fs_entries,
.alloc_fn = block_fs_alloc,
.clean_fn = block_fs_clean,
.validate_fn = block_fs_validate,
.resolve_fn = NULL,
};
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