Fix 11 Gitea issues (#29, #30, #31, #35, #38, #41, #42, #43, #44, #45, #46)

#29 - compression_level now used in data_compress()
#30 - chunk_size no longer truncated to 32-bit
#31 - chmod/chown failures now logged
#35 - strtok -> strtok_r for thread safety
#38 - open_next_directory returns -1 on opendir failure
#41 - file_send_sendfile uses compression_level param
#42 - dirname() uses copy to avoid modifying input
#43 - delete_extras_walk checks manifest before rmdir
#44 - server_host/port moved into Config struct
#45 - SSH parse_remote_dest uses dynamic allocation
#46 - send_chunk refactored, reduced nesting/duplication

src/shared/metadata.c

@@ -1,6 +1,8 @@
 #include "metadata.h"
 #include "file.h"
+#include "log.h"
 #include "protocol.h"
+#include <errno.h>
 #include <fcntl.h>
 #include <stdlib.h>
 #include <string.h>
@@ -96,9 +98,10 @@ FileMetadata* metadata_receive(int file_descriptor, int* ok) {
 void file_restore_metadata(const char* path, FileMetadata* metadata) {
   if (metadata == NULL)
     return;
-  chmod(path, metadata->mode & 07777);
-  int chown_ret = chown(path, metadata->uid, metadata->gid);
-  (void)chown_ret;
+  if (chmod(path, metadata->mode & 07777) != 0)
+    log_message(LOG_LEVEL_WARNING, "Failed to chmod %s: %s", path, strerror(errno));
+  if (chown(path, metadata->uid, metadata->gid) != 0)
+    log_message(LOG_LEVEL_WARNING, "Failed to chown %s: %s", path, strerror(errno));
   struct timespec times[2];
   times[0].tv_sec = 0;
   times[0].tv_nsec = UTIME_OMIT;