TapTap
6f974eff19
--dry-run now handshakes with a remote/daemon receiver and reports what WOULD transfer/skip based on receiver state, mutating nothing on either side. - Serialize Config.dry_run into the wire config frame and append STATUS_DRY_RUN_TRANSFER to the status enum (no renumbering); bump PROTOCOL_VERSION/CMake VERSION/CHANGELOG/golden wire to 2.21.0. - Receiver: receive_incremental_check_ex runs the normal read-only decision and answers STATUS_OK (skip) or STATUS_DRY_RUN_TRANSFER (would transfer) with no basis materialization/append/delta/full transfer. All mutation sites are guarded by !dry_run: file store, manifest deletes, --mkpath root creation, --delay-updates staging, publication, directory-time application, and outcome acks. - Client: send_dry_run_remote connects, sends the config, checks each regular file and prints the would-transfer set + trailer; no file data or delete manifest is sent. Plain local destinations keep the client-side manifest.
122 lines
6.9 KiB
C
122 lines
6.9 KiB
C
#ifndef FILE_RECEIVE_H
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#define FILE_RECEIVE_H
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#include "config.h"
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#include "file_types.h"
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#include <stdbool.h>
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/* Server-side file receive/save path. */
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/* Cumulative caps for the deferred directory-time accumulator. The sender may
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* legitimately split a large tree across repeated STATUS_DIR_TIMES frames, so a
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* per-frame bound is not enough: the receiver must bound the TOTAL it retains
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* against a hostile sender. Mirror the delete-manifest limits
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* (MAX_MANIFEST_ENTRIES / MAX_MANIFEST_BYTES): the entry count bounds the
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* metadata array and the byte budget bounds the concatenated path strings. */
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#define MAX_DIR_TIME_ENTRIES (1024 * 1024)
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#define MAX_DIR_TIME_BYTES (16ULL * 1024 * 1024)
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File* file_receive(const Config* config, int file_descriptor);
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File* file_receive_directory(int file_descriptor, const Config* config);
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File* file_receive_dir_time(int file_descriptor, const Config* config);
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File* file_receive_hardlink(int file_descriptor);
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File* file_receive_symlink(int file_descriptor, const Config* config);
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File* file_receive_special(int file_descriptor);
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bool file_special_rdev_valid(int32_t major, int32_t minor, mode_t mode);
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File* receive_incremental_check(int fd, const Config* config, bool* skipped);
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/* Extended variant used by the receiver. `would_transfer` (may be NULL) is set
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* true only on the server-contacting --dry-run path when the file is not up to
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* date: the receiver has already sent STATUS_DRY_RUN_TRANSFER and returns NULL
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* without storing anything. On that path `*skipped` is true for an up-to-date
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* (STATUS_OK) file and both flags are false for a genuine error. */
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File* receive_incremental_check_ex(int fd, const Config* config, bool* skipped,
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bool* would_transfer);
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/* P7 Wave D directory-time accumulator. The receiver collects the metadata of
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* every directory it creates/receives (STATUS_MKDIR with metadata and/or the
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* trailing STATUS_DIR_TIMES frame(s)) and applies the times only at the END of the
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* transfer, after all children have been written and after the delete /
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* --delay-updates phases have committed (writing or removing a child bumps the
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* parent's mtime). -O/--omit-dir-times skips the application entirely. The
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* list owns deep copies of the paths and metadata; freed on every path. */
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typedef struct {
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char** paths; /* owned, destination-relative wire paths */
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FileMetadata* entries; /* owned, parallel to paths */
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size_t count;
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size_t capacity;
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size_t bytes; /* cumulative strlen of every retained path */
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} DirTimeList;
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/* Capture gate shared by the sender-side and receiver-side sinks: directory
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* metadata is accumulated only when --times/--metadata is in effect and
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* -O/--omit-dir-times does not suppress it. Kept here, next to the accumulator
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* it guards, so both call sites express the same condition. */
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bool dir_times_should_capture(const Config* config);
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void dir_time_list_init(DirTimeList* list);
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void dir_time_list_free(DirTimeList* list);
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/* Deep-copy one directory's path + metadata into the list. Returns false on
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* allocation failure OR when the cumulative entry/byte caps would be exceeded
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* (the caller fails the transfer). */
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bool dir_time_list_add(DirTimeList* list, const char* wire_path, const FileMetadata* metadata);
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/* Apply every accumulated directory's mtime (and atime when captured) beneath
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* `root_directory`, confined fd-relative. Best-effort per entry: an absent
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* directory (an empty/pruned source dir that was deliberately not created) or a
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* non-directory at the path is skipped QUIETLY, an unreachable one with a
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* warning, and never fatal. */
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void dir_time_list_apply(const DirTimeList* list, const char* root_directory);
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/* A received delete-manifest frame: the keep-set (`keeps`, destination-relative
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paths the sender transferred/keeps) plus `protected`, destination-relative
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prefixes the sender asks the receiver never to delete (paths excluded on the
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source, protected at any depth). When --delete-excluded is given the sender
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transmits an empty protected list so excluded destination mirrors are treated
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as ordinary extras. With --delete-missing-args a third section (`missing`)
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carries the destination mirrors of explicitly-listed source entries that do
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not exist: each is an exact deletion request, independent of the ordinary
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extras walk (never blocked by the protected prefixes) and processed when the
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manifest is committed. */
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typedef struct DeleteManifest {
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ArrayList* keeps;
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ArrayList* protected;
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ArrayList* missing;
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} DeleteManifest;
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void delete_manifest_free(DeleteManifest* manifest);
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/* Read a delete-manifest frame: keep count + keeps, then protected count +
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protected prefixes, then missing count + missing paths (self-delimiting; the
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leading STATUS_MANIFEST code has been consumed). Returns an owned
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DeleteManifest, or NULL after signalling STATUS_ERROR on a malformed frame. */
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DeleteManifest* receive_manifest_entries(int fd);
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/* Remove destination entries under config->receive_root_directory that are not
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in `manifest` (bounded, all-or-nothing walk; staging-dir, basis-dir and
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protected-prefix skips). `--max-delete` and `--force` are honored here. The
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caller decides WHEN to run it based on the negotiated delete timing. Returns
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false (and the transfer fails) when the deletion cannot be committed. */
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bool manifest_delete_extras(const Config* config, DeleteManifest* manifest);
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/* --delete-missing-args exact-path deletions: remove each destination mirror
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in `manifest->missing` (never blocked by the protected prefixes, staging dir
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and basis dirs excluded). A regular file/symlink is unlinked; an empty
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directory is removed; a NON-empty directory is removed recursively only when
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--delete or --force is in effect, otherwise it is left with a warning (rsync
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parity). A missing path is a no-op. Returns false only on a genuine
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confinement or I/O error (the run then fails); tolerated per-path cases are
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reported and skipped. */
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bool manifest_delete_missing_args(const Config* config, DeleteManifest* manifest);
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/* Run every deletion family the manifest carries: the --delete-missing-args
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exact-path deletions first (user requests are not blocked by exclusion
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protection), then the ordinary extras walk when --delete is active. Returns
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true when nothing to do or everything committed. */
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bool manifest_delete_all(const Config* config, DeleteManifest* manifest);
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/* Outcome of a single file_save_to_disk operation. The receiver needs to
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distinguish "written" from "skipped" so --remove-source-files can be told
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which sources were actually stored. */
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typedef enum { FILE_SAVE_ERROR = 0, FILE_SAVE_WRITTEN = 1, FILE_SAVE_SKIPPED = 2 } FileSaveResult;
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FileSaveResult file_save_to_disk_full(const char* root_directory, const File* file,
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const Config* config);
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bool file_save_to_disk(const char* root_directory, const File* file, const Config* config);
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#endif
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