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Stage every successfully written file under a private 0700 .fastsync-stage directory inside the receive root and atomically publish all staged files only after the whole protocol stream (manifest/delete handling included) has completed, immediately before the success/outcome frame. On any abort/error before publication nothing is installed and staging is removed; a publish failure aborts the transfer with best-effort cleanup of the remainder (already-published files are not rolled back). Crash leftovers are wiped when the next delayed transfer starts. Wire: new delay_updates config flag (selection-options block), protocol version bumped to 2.6.0, client/server validation rejects --inplace. CLI/usage/validation updated. Works in single-threaded and -m modes (exactly one write_thread stages files; the staged-file registry is mutex-protected; publication runs once after both threads join). --existing/--ignore-existing/--update decide against the final destination at stage time; --backup is deferred to publication. remove_source_files outcomes are only sent after publication so skipped/unpublished sources are never deleted. Default (no flag) behavior is unchanged. Tests: config wire round-trip, CLI parse, --inplace rejection, new test_delay_updates unit suite (27 suites total), and integration TestDelayUpdates covering single/-m parity, incremental reruns, remove source files, receiver-skip ordering, and a deterministic publish-failure abort path.
67 lines
3.6 KiB
C
67 lines
3.6 KiB
C
#ifndef FILE_H
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#define FILE_H
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#include "file_send.h"
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#include "file_receive.h"
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#include "file_types.h"
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#include <stdbool.h>
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#include <stdint.h>
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#include <sys/stat.h>
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/* File/FileMetadata lifecycle, local disk helpers, and secure filesystem
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primitives shared by the send/receive pipelines. */
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File* file_create(const char* path);
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void file_destroy(void* item);
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bool file_load_data(File* file);
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bool file_checksum(File* file, uint64_t* checksum);
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size_t file_content_to_buffer(File* file);
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FileMetadata* file_metadata_create(const struct stat* stats);
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void file_metadata_destroy(void* metadata);
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bool file_write_to_disk(const char* path, const void* data, unsigned long long data_size,
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bool inplace, bool sparse);
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/* A configured fd without a canonical identity deliberately rejects paths. */
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bool file_set_authorized_root(int fd, const char* canonical_path);
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/* Secure path/filesystem primitives (symlink-safe, O_NOFOLLOW, root-confined). */
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bool file_path_exists_secure(const char* path);
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bool file_stat_secure(const char* path, struct stat* st);
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bool file_destination_is_newer_secure(const char* path, const FileMetadata* metadata);
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int file_open_secure_parent(const char* path, char** leaf_out, bool create_dirs);
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bool file_ensure_directory_secure(const char* path);
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bool file_rename_secure(const char* old_path, const char* new_path);
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/* Open a private 0700 directory (creating it on demand) that must live below
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the authorized root. Used for the --temp-dir scratch directory and the
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--delay-updates staging directory. */
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int file_open_private_dir(const char* dir_path);
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/* The file_to_disk_secure* variants write a temporary copy in the destination
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directory and atomically rename it over `path`. temp_dir is an absolute,
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root-confined scratch directory (already validated by the caller): when it
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is non-NULL the temporary copy is instead created there (with a name unique
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across the whole scratch directory) and atomically renamed into the
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destination directory once fully written and fsynced. A rename across
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filesystems (EXDEV) fails the write with an error; the file is never
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silently copied into place. Pass NULL for the historical same-directory
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behavior. --inplace writes never use temp_dir. */
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bool file_to_disk_secure(const char* path, const void* data, unsigned long long data_size,
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bool inplace, bool sparse, const FileMetadata* metadata,
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bool preserve_executability, const char* temp_dir);
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bool file_to_disk_secure_with_fsync(const char* path, const void* data,
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unsigned long long data_size, bool inplace, bool sparse,
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const FileMetadata* metadata, bool preserve_executability,
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bool use_fsync, const char* temp_dir);
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/* With update enabled, an existing newer destination is left untouched. The
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check is descriptor-based for inplace writes; atomic replacement still has
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an unavoidable final rename race without filesystem locking. */
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bool file_to_disk_secure_update(const char* path, const void* data, unsigned long long data_size,
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bool inplace, bool sparse, const FileMetadata* metadata,
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bool preserve_executability, const char* temp_dir);
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bool file_to_disk_secure_no_replace(const char* path, const void* data,
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unsigned long long data_size, bool sparse,
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const FileMetadata* metadata, bool preserve_executability,
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const char* temp_dir);
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#endif
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