Started implementing backing managment
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63
src/backing.c
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63
src/backing.c
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@ -0,0 +1,63 @@
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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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#include <errno.h>
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#include <unistd.h>
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#include <sys/stat.h>
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bool is_valid_backing_id(const char* backing_id) {
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if (backing_id == NULL)
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return false;
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size_t length = strlen(backing_id);
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// Check that the length is valid
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if (length == 0 || length > MAX_BACKING_LENGTH)
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return false;
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// Check that the backing id does not contain any slashes
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for (size_t i = 0; i < length; i++)
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if (backing_id[i] == '/')
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return false;
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// Check that the backing id is not a reserved name
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if (strcmp(backing_id, ".") == 0 || strcmp(backing_id, "..") == 0)
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return false;
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return true;
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}
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Result get_backing_path(const char* backing_id, char** out_path) {
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*out_path = NULL;
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// Check that the backing id is valid
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if (!is_valid_backing_id(backing_id)) {
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log_message(LOG_LEVEL_ERROR, "Invalid backing id '%s'.", backing_id);
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return FAILURE;
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}
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return format(out_path, "%s/%s", BACKING_POOL_DIR, backing_id);
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}
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Result backing_exists(const char* backing_id, bool* out_exists) {
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*out_exists = false;
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// Get the path of the backing
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char* path;
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Result result = get_entry_path(backing_id, &path);
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if (result != SUCCESS)
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return result;
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// Check if the backing exists and is a file
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struct stat st;
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bool exists = stat(path, &st) == 0 && S_ISREG(st.st_mode);
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// Free the path
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free(path);
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// Output the result
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*out_exists = exists;
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return SUCCESS;
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}
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27
src/backing.h
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27
src/backing.h
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@ -0,0 +1,27 @@
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#pragma once
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#include "utils.h"
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#include "disk.h"
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#include <stdbool.h>
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#include <stdint.h>
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#define BACKING_POOL_DIR "/var/lib/sandbox/backings"
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#define MAX_BACKING_LENGTH 256
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/// @brief Checks whether the given backing id is valid.
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/// @param backing_id The backing id to check.
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/// @return True if the backing id is valid, false otherwise.
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bool is_valid_backing_id(const char* backing_id);
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/// @brief Gets the path of the given backing.
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/// @param backing_id The backing id.
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/// @param out_path The pointer to the output path string. The caller is responsible for freeing the memory.
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/// @return The result of the operation.
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Result get_backing_path(const char* backing_id, char** out_path);
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/// @brief Checks whether the given backing exists in the pool.
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/// @param backing_id The backing id.
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/// @param out_exists The pointer to the output boolean.
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/// @return The result of the operation.
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Result backing_exists(const char* backing_id, bool* out_exists);
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21
src/entry.c
21
src/entry.c
@ -304,6 +304,27 @@ Result list_entries(char*** out_entries) {
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return SUCCESS;
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}
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Result clear_entries(void) {
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char** entries;
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Result result = list_entries(&entries);
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if (result != SUCCESS)
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return result;
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// Remove each entry
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for (int i = 0; entries[i] != NULL; i++) {
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result = remove_entry(entries[i]);
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if (result != SUCCESS)
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log_message(LOG_LEVEL_WARNING, "Failed to remove the entry '%s'.", entries[i]);
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}
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// Free the entries
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for (int i = 0; entries[i] != NULL; i++)
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free(entries[i]);
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free(entries);
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return SUCCESS;
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}
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Result reset_entry(const char* entry_id) {
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// Check that it exists
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bool exists;
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@ -9,6 +9,10 @@
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#define ENTRY_POOL_DIR "/var/lib/sandbox/entries"
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#define MAX_ENTRY_LENGTH 256
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#define ENTRY_TYPE_ROOT_STRING "ROOT"
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#define ENTRY_TYPE_BACKED_STRING "BACKED"
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#define ENTRY_TYPE_AUTOMATIC_STRING "AUTOMATIC"
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typedef enum {
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ENTRY_TYPE_UNKNOWN,
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ENTRY_TYPE_ROOT,
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@ -16,10 +20,6 @@ typedef enum {
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ENTRY_TYPE_AUTOMATIC
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} EntryType;
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#define ENTRY_TYPE_ROOT_STRING "ROOT"
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#define ENTRY_TYPE_BACKED_STRING "BACKED"
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#define ENTRY_TYPE_AUTOMATIC_STRING "AUTOMATIC"
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typedef struct {
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EntryType type;
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char* backing_id;
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