linuxinstall/src/entry.c

#include "entry.h"

#include "utils.h"
#include "disk.h"

#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/stat.h>

bool is_entry_id_valid(const char* entry_id) {
	if (entry_id == NULL)
		return false;

	size_t length = strlen(entry_id);

	// Check that the length is valid
	if (length == 0 || length > MAX_ENTRY_LENGTH)
		return false;

	// Check that the entry id does not contain any slashes
	for (size_t i = 0; i < length; i++)
		if (entry_id[i] == '/')
			return false;

	// Check that the entry id is not a reserved name
	if (strcmp(entry_id, ".") == 0 || strcmp(entry_id, "..") == 0)
		return false;

	return true;
}

Result get_entry_path(const char* entry_id, char** out_path) {
	*out_path = NULL;

	// Check that the entry id is valid
	if (!is_entry_id_valid(entry_id)) {
		log_message(LOG_LEVEL_ERROR, "Invalid entry id '%s'.", entry_id);
		return FAILURE;
	}

	return format(out_path, "%s/%s", ENTRY_POOL_DIR, entry_id);
}

Result entry_exists(const char* entry_id, bool* out_exists) {
	*out_exists = false;

	// Get the path of the entry
	char* path;
	Result result = get_entry_path(entry_id, &path);
	if (result != SUCCESS)
		return result;

	// Check if the entry exists and is a directory
	struct stat st;
	bool exists = stat(path, &st) == 0 && S_ISDIR(st.st_mode);

	// Free the path
	free(path);

	// Output the result
	*out_exists = exists;

	return SUCCESS;
}