Started implementing the backing system
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62
src/backing.c
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62
src/backing.c
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#include "backing.h"
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#include <stdlib.h>
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#include <string.h>
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bool IsBackingIdentifierValid(const char* backing_identifier) {
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if (backing_identifier == NULL)
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return false;
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// Check that the identifier is not empty or too long
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size_t length = strlen(backing_identifier);
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if (length == 0 || length > 64)
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return false;
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// Check that the identifier does not contain any slashes
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for (size_t i = 0; i < length; i++)
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if (backing_identifier[i] == '/')
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return false;
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// Check that the identifier is not "." or ".."
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if (strcmp(backing_identifier, ".") == 0 || strcmp(backing_identifier, "..") == 0)
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return false;
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// Check that the identifier starts with a number
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if (backing_identifier[0] >= '0' && backing_identifier[0] <= '9')
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return false;
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return true;
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}
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int GetBackingIndex(const char* backing_identifier) {
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// Check that the identifier is valid
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if (!IsBackingIdentifierValid(backing_identifier))
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return -1;
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// Get the index
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return atoi(backing_identifier);
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}
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Status GetBackingPoolPath(char** _backing_pool_path) {
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return Format(_backing_pool_path, "/var/lib/sandbox/backings");
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}
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Status GetBackingDiskPath(const char* backing_identifier, char** _backing_path) {
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// Check that the identifier is valid, as it will be used in a path
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if (!IsBackingIdentifierValid(backing_identifier)) {
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Log(LOG_LEVEL_ERROR, "Invalid backing identifier '%s'.", backing_identifier);
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return FAILURE;
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}
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// Get the backing pool path
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char* backing_pool_path = NULL;
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Status status = GetBackingPoolPath(&backing_pool_path);
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if (status != SUCCESS)
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return status;
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// Format the backing path
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status = Format(_backing_path, "%s/%s", backing_pool_path, backing_identifier);
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free(backing_pool_path);
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return status;
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}
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9
src/backing.h
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9
src/backing.h
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#pragma once
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#include "utils.h"
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bool IsBackingIdentifierValid(const char* backing_identifier);
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int GetBackingIndex(const char* backing_identifier);
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Status GetBackingPoolPath(char** _backing_pool_path);
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Status GetBackingDiskPath(const char* backing_identifier, char** _backing_path);
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