Added disk operation signatures
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32
src/disk.h
Normal file
32
src/disk.h
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@ -0,0 +1,32 @@
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#pragma once
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#include "utils.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/types.h>
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/// @brief Creates an empty disk at the given path, with the given size and with the given permissions.
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/// @param path The path to the disk to create.
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/// @param size The size of the disk to create.
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/// @param permissions The permissions to set on the disk.
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/// @return The result of the operation.
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Result create_empty_disk(const char* path, uint64_t size, mode_t permissions);
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/// @brief Creates a backed disk at the given path, with the given backing disk and with the given permissions.
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/// @param path The path to the disk to create.
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/// @param backing_disk The disk to back the new disk with.
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/// @param permissions The permissions to set on the disk.
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/// @return The result of the operation.
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Result create_backed_disk(const char* path, const char* backing_disk, mode_t permissions);
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/// @brief Trims a disk to remove any unused space.
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/// @param path The path to the disk to trim.
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/// @return The result of the operation.
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Result trim_disk(const char* path);
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/// @brief Moves a disk's backing file to the given path.
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/// @param path The path to the disk to move.
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/// @param backing_disk The new path to the backing disk.
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/// @return The result of the operation.
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Result rebase_disk(const char* path, const char* backing_disk);
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47
src/entry.c
47
src/entry.c
@ -4,6 +4,7 @@
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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 <sys/stat.h>
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bool is_entry_id_valid(const char* entry_id) {
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@ -12,21 +13,30 @@ bool is_entry_id_valid(const char* entry_id) {
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size_t length = strlen(entry_id);
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// Check that the length is valid
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if (length == 0 || length > MAX_ENTRY_LENGTH)
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return false;
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// Check that the entry id does not contain any slashes
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for (size_t i = 0; i < length; i++)
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if (entry_id[i] == '/')
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return false;
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// Check that the entry id is not a reserved name
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if (strcmp(entry_id, ".") == 0 || strcmp(entry_id, "..") == 0)
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return false;
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return true;
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}
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Result get_entry_path(const char* entry_id, char** out_path) {
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*out_path = NULL;
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if (!is_entry_id_valid(entry_id))
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// Check that the entry id is valid
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if (!is_entry_id_valid(entry_id)) {
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log_message(LOG_LEVEL_ERROR, "Invalid entry id '%s'.", entry_id);
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return FAILURE;
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}
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return format(out_path, "%s/%s", ENTRY_POOL_DIR, entry_id);
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}
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@ -34,17 +44,52 @@ Result get_entry_path(const char* entry_id, char** out_path) {
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Result entry_exists(const char* entry_id, bool* out_exists) {
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*out_exists = false;
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// Get the path of the entry
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char* path;
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Result result = get_entry_path(entry_id, &path);
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if (result != SUCCESS)
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return result;
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// Check if the entry exists and is a directory
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struct stat st;
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bool exists = stat(path, &st) == 0 && S_ISDIR(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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Result add_entry(const char* entry_id) {
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// Check if the entry already exists
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bool exists;
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Result result = entry_exists(entry_id, &exists);
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if (result != SUCCESS)
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return result;
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if (exists) {
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log_message(LOG_LEVEL_ERROR, "Entry '%s' already exists.", entry_id);
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return FAILURE;
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}
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// Create the entry directory
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char* path;
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result = get_entry_path(entry_id, &path);
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if (result != SUCCESS)
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return result;
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int result_code = mkdir(path, 0755);
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free(path);
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// Check if the operation failed
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if (result_code != 0) {
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log_message(LOG_LEVEL_ERROR, "Failed to create entry '%s' (%s).", entry_id, strerror(errno));
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return FAILURE;
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}
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return SUCCESS;
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}
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@ -25,3 +25,7 @@ Result get_entry_path(const char* entry_id, char** out_path);
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/// @return The result of the operation.
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Result entry_exists(const char* entry_id, bool* out_exists);
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/// @brief Adds an entry to the entry pool.
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/// @param entry_id The entry id.
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/// @return The result of the operation.
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Result add_entry(const char* entry_id);
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@ -112,24 +112,10 @@ int command_add_entry(int argc, char* argv[]) {
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// Extract the entry id
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const char* entry_id = argv[0];
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// Check if the entry id is valid
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if (!is_entry_id_valid(entry_id)) {
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log_message(LOG_LEVEL_ERROR, "Invalid entry id '%s'.", entry_id);
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return EXIT_FAILURE;
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}
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// Check if the entry already exists
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bool exists;
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if (entry_exists(entry_id, &exists) != SUCCESS)
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return EXIT_FAILURE;
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if (exists) {
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log_message(LOG_LEVEL_ERROR, "Entry '%s' already exists.", entry_id);
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return EXIT_FAILURE;
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}
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// Create the entry
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// TODO
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Result result = add_entry(entry_id);
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if (result != SUCCESS)
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return result;
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// Add the disk to the entry
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// TODO
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