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Incremental sync: --incremental flag to skip unchanged files

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- New STATUS_CHECK protocol status (value 6)
- Client sends path + size + mtime; server replies OK (skip) or NEXT (send)
- config.h/c: use_incremental field sent/received over wire
- file.c/h: file_send_single_calls_no_path helper for incremental path
- client_cli.c: --incremental flag
- client_send.c: per-file check before send in both single and chunk paths
- server.c: STATUS_CHECK handling in receive_files()
- multiprocessing.c: STATUS_CHECK handling in receive_thread()
- test.py: incremental sync test case
This commit is contained in:
TapTap
2026-07-16 15:38:48 +02:00
parent a3acf4b8b6
commit 1905369c9f
11 changed files with 406 additions and 247 deletions
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src/server/server.c
+58 -2
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@@ -16,12 +16,68 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
int receive_files(Config *config, int file_descriptor) {
Status status;
if (!receive_status(file_descriptor, &status)) return -1;
while (status == STATUS_NEXT || status == STATUS_CHUNK) {
if (status == STATUS_CHUNK) {
while (status == STATUS_NEXT || status == STATUS_CHUNK || status == STATUS_CHECK) {
if (status == STATUS_CHECK) {
char *check_path = receive_str(file_descriptor);
if (check_path == NULL) { send_status(file_descriptor, STATUS_ERROR); return -1; }
unsigned long long check_size;
long long check_mtime;
if (!receive_n_data(file_descriptor, &check_size, sizeof(check_size)) ||
!receive_n_data(file_descriptor, &check_mtime, sizeof(check_mtime))) {
free(check_path);
send_status(file_descriptor, STATUS_ERROR);
return -1;
}
char *full_path = path_cat(config->receive_root_directory, check_path);
struct stat st;
bool match = false;
if (full_path && stat(full_path, &st) == 0 &&
(unsigned long long)st.st_size == check_size &&
(long long)st.st_mtime == check_mtime) {
match = true;
}
free(full_path);
if (match) {
if (!send_status(file_descriptor, STATUS_OK)) { free(check_path); return -1; }
free(check_path);
} else {
if (!send_status(file_descriptor, STATUS_NEXT)) { free(check_path); return -1; }
File *file = file_create(check_path);
free(check_path);
if (file == NULL) { send_status(file_descriptor, STATUS_ERROR); return -1; }
if (config->use_metadata) {
file->metadata = metadata_receive(file_descriptor);
}
Data *file_data = receive_data(file_descriptor);
if (file_data == NULL) {
file_destroy(file);
send_status(file_descriptor, STATUS_ERROR);
return -1;
}
if (config->use_compression) {
Data *uncompressed = data_decompress(file_data);
data_destroy(file_data);
if (uncompressed == NULL) { file_destroy(file); send_status(file_descriptor, STATUS_ERROR); return -1; }
file_data = uncompressed;
}
data_destroy(file->data);
file->data = file_data;
if (config->save_to_disk) {
char *disk_path = path_cat(config->receive_root_directory, file->path);
if (disk_path) {
to_disk(disk_path, file->data->data, file->data->size);
file_restore_metadata(disk_path, file->metadata);
free(disk_path);
}
}
file_destroy(file);
}
} else if (status == STATUS_CHUNK) {
Data *chunk_data = receive_data(file_descriptor);
if (chunk_data == NULL) {
log_message(LOG_LEVEL_ERROR, "Failed to receive chunk data");