From 26e2a15bc99ae049324df5b61beb9e9ae17300d0 Mon Sep 17 00:00:00 2001
From: "Fred T. Hamster" <fred@gruntose.com>
Date: Sat, 26 Jan 2013 22:21:01 -0500
Subject: [PATCH] seeking out problem file.

---
 nucleus/library/filesystem/directory.cpp      |  4 ++--
 nucleus/library/filesystem/file_info.cpp      |  6 +++++-
 nucleus/library/filesystem/filename.cpp       |  3 +--
 nucleus/library/filesystem/heavy_file_ops.cpp |  1 +
 nucleus/library/filesystem/huge_file.cpp      | 20 +++++++++++++++++++
 nucleus/library/filesystem/huge_file.h        |  3 +++
 scripts/schedule/junkempty                    |  0
 7 files changed, 32 insertions(+), 5 deletions(-)
 create mode 100644 scripts/schedule/junkempty

diff --git a/nucleus/library/filesystem/directory.cpp b/nucleus/library/filesystem/directory.cpp
index 5a056f7a..052c10bf 100644
--- a/nucleus/library/filesystem/directory.cpp
+++ b/nucleus/library/filesystem/directory.cpp
@@ -209,9 +209,9 @@ bool directory::rescan()
     if (add_it && !fnmatch(_pattern->s(), file, 0)) {
       filename temp_name(*_path, file);
       if (!temp_name.is_normal()) {
-#ifdef DEBUG_DIRECTORY
+//#ifdef DEBUG_DIRECTORY
         LOG(astring("skipping abnormal file:  ") + temp_name);
-#endif
+//#endif
         entry = readdir(dir);
         continue;  // cannot be adding goofy named pipes etc; cannot manage those.
       }
diff --git a/nucleus/library/filesystem/file_info.cpp b/nucleus/library/filesystem/file_info.cpp
index ed66d7b4..13e503f4 100644
--- a/nucleus/library/filesystem/file_info.cpp
+++ b/nucleus/library/filesystem/file_info.cpp
@@ -134,7 +134,10 @@ bool file_info::calculate(const astring &prefix, bool just_size, int checksum_ed
   bool skip_tail = false;  // true if we don't need the tail piece.
   double head_start = 0, head_end = 0, tail_start = 0,
       tail_end = _file_size - 1;
-  if (_file_size <= double(2 * checksum_edge)) {
+  if (_file_size == 0) {
+    head_end = 0;
+    skip_tail = true;
+  } else if (_file_size <= double(2 * checksum_edge)) {
     // we're applying a rule for when the file is too small compared to
     // the chunk factor doubled; we'll just read the whole file.
     head_end = _file_size - 1;
@@ -188,6 +191,7 @@ int file_info::packed_size() const
 
 void file_info::pack(byte_array &packed_form) const
 {
+  FUNCDEF("pack");
   filename::pack(packed_form);
   attach(packed_form, _file_size);
   _time.pack(packed_form);
diff --git a/nucleus/library/filesystem/filename.cpp b/nucleus/library/filesystem/filename.cpp
index 4ea4269a..81ca6f02 100644
--- a/nucleus/library/filesystem/filename.cpp
+++ b/nucleus/library/filesystem/filename.cpp
@@ -383,11 +383,10 @@ bool filename::exists() const
 {
   if (is_directory())
     return true;
+  // if the file name is empty, that cannot exist.
   if (!length())
     return false;
   return is_readable();
-///  byte_filer opened(observe(), "rb");
-///  return opened.good();
 }
 
 bool filename::legal_character(char to_check)
diff --git a/nucleus/library/filesystem/heavy_file_ops.cpp b/nucleus/library/filesystem/heavy_file_ops.cpp
index 9a5451b7..695746c8 100644
--- a/nucleus/library/filesystem/heavy_file_ops.cpp
+++ b/nucleus/library/filesystem/heavy_file_ops.cpp
@@ -189,6 +189,7 @@ outcome heavy_file_operations::write_file_chunk(const astring &target,
     // open the file for updating (either read or write).
   if (!target_file.good()) return TARGET_ACCESS_ERROR;
   double curr_len = target_file.length();
+  target_file.touch();
 
   if (curr_len < byte_start) {
     byte_array new_chunk;
diff --git a/nucleus/library/filesystem/huge_file.cpp b/nucleus/library/filesystem/huge_file.cpp
index 33b4672a..bdc15228 100644
--- a/nucleus/library/filesystem/huge_file.cpp
+++ b/nucleus/library/filesystem/huge_file.cpp
@@ -20,6 +20,7 @@
 #include <basis/guards.h>
 
 #include <stdio.h>
+#include <sys/time.h>
 
 #undef LOG
 #define LOG(to_print) printf("%s::%s: %s\n", static_class_name(), func, astring(to_print).s())
@@ -276,5 +277,24 @@ outcome huge_file::write(const byte_array &to_write, int &size_written)
   return OKAY;
 }
 
+basis::outcome huge_file::touch()
+{
+  if (filename(_real_file->name()).exists()) {
+    // file exists, so just update time.
+    int ret = utimes(_real_file->name().observe(), NIL);
+    if (ret != 0)
+      return FAILURE;
+  } else {
+    // file doesn't exist yet.
+    byte_array junk(1);
+    int written;
+    outcome ret = write(junk, written);
+    if (ret != OKAY) ret;
+    if (!truncate())
+      return FAILURE;
+  }
+  return OKAY;
+}
+
 } //namespace.
 
diff --git a/nucleus/library/filesystem/huge_file.h b/nucleus/library/filesystem/huge_file.h
index 69a10347..28fd1d61 100644
--- a/nucleus/library/filesystem/huge_file.h
+++ b/nucleus/library/filesystem/huge_file.h
@@ -83,6 +83,9 @@ public:
   bool truncate();
     //!< truncates the file after the current position.
 
+  basis::outcome touch();
+    //<! creates the file if it doesn't exist, or updates the time on the file.
+
   void flush();
     //!< forces any pending writes to actually be saved to the file.
 
diff --git a/scripts/schedule/junkempty b/scripts/schedule/junkempty
new file mode 100644
index 00000000..e69de29b
-- 
2.34.1