From 74272cdbacfafba0ff73372af3eb1568da46571e Mon Sep 17 00:00:00 2001
From: Göran Krampe <goran@3dicc.com>
Date: Wed, 12 Nov 2014 01:05:13 +0100
Subject: [PATCH] First commit

---
 README.md |   0
 fat.nim   | 127 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 127 insertions(+), 0 deletions(-)
 create mode 100644 README.md
 create mode 100644 fat.nim

diff --git a/README.md b/README.md
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/README.md
diff --git a/fat.nim b/fat.nim
new file mode 100644
index 0000000..03d9099
--- /dev/null
+++ b/fat.nim
@@ -0,0 +1,127 @@
+import md5, os, osproc, parseopt2, strutils, parsecfg, streams
+
+# This is a little utility program for handling large files
+# in git repositories. Its inspired by git-fat and s3annex
+# but doesn't rely on S3 for storage.
+#
+# Use "fat d mybigfile" to deflate it before commit.
+# Use "fat i mybigfile" to inflate it back to original size.
+#
+# When deflated the file only has an md5sum string inside it.
+#
+# The file is copied over into:
+#  <homedir>/fatstore/<originalfilename>-<md5sum>
+
+var fatstore, remoteFatstore: string
+
+
+# Load fatstore.conf file, overkill for now but...
+proc parseConfFile(filename: string) =
+  echo filename
+  var f = newFileStream(filename, fmRead)
+  if f != nil:
+    var p: CfgParser
+    open(p, f, filename)
+    while true:
+      var e = next(p)
+      case e.kind
+      of cfgEof: 
+        break
+      of cfgSectionStart:
+        continue # Ignore
+      of cfgKeyValuePair:
+        if e.key == "remote":
+          remoteFatstore = e.value
+        else:
+          quit("Unknown configuration: " & e.key)
+      of cfgOption:
+        quit("Unknown configuration: " & e.key)
+      of cfgError:
+        quit("Parsing " & filename & ": " & e.msg)
+    close(p)
+
+
+# Upload a file to the remote master fatstore
+proc uploadFile(fatfilename: string) =
+  if remoteFatstore.isNil:
+    echo("Remote fatstore not set in configuration file, not uploading content:\n\t" & fatfilename)
+    return
+  let errorCode = execCmd("rsync -a " & fatstore / fatfilename & " " & remoteFatstore)
+  if errorCode != 0: quit("Something went wrong uploading content to " & remoteFatstore, 2)
+  
+# Download a file to the remote master fatstore
+proc downloadFile(fatfilename: string) =
+  if remoteFatstore.isNil:
+    quit("Remote fatstore not set in configuration file, can not download content:\n\t" & fatfilename)
+  let errorCode = execCmd("rsync -a " & remoteFatstore / fatfilename & " " & fatstore / "")
+  if errorCode != 0: quit("Something went wrong downloading " & fatfilename & " from " & remoteFatstore, 3)
+
+
+# Copy content to fatstore, no upload yet.
+proc copyToFatstore(filename, fatfilename: string) =
+  if not existsFile(fatstore / fatfilename):
+    copyFile(filename, fatstore / fatfilename)
+    uploadFile(fatfilename)
+
+# Copy content from fatstore, and downloading first if needed
+proc copyFromFatstore(fatfilename, filename: string) =
+  if not existsFile(fatstore / fatfilename):
+    downloadFile(fatfilename)
+  copyFile(fatstore / fatfilename, filename)
+
+    
+# Copy original file to fatstore and replace with hash stub in git.
+proc deflate(filename: string) =
+  let content = readFile(filename)
+  if content[0..4] == "hash:":
+    quit("File is already deflated, ignored.", 5)
+  let hash = getMD5(content)
+  let fatfilename = filename & "-" & hash
+  copyToFatstore(filename, fatfilename)
+  writeFile(filename, "hash:" & fatfilename)
+
+# Parse out hash from hash stub and copy back original content from fatstore.
+proc inflate(filename: string) =
+  var hashfile: File
+  if not open(hashfile, filename):
+    quit("Could not open file: " & filename, 4)
+  let hashline = split(string(readLine(hashfile)), {':'})
+  if hashline[0] == "hash":
+    let fatfilename = hashline[1]
+    #removeFile(filename)
+    copyFromFatstore(fatfilename, filename)
+  else:
+    quit("File is not a fat file.", 5)
+
+
+################################ main #####################################
+
+# Hardwired to "fatstore" directory in home dir.
+fatstore = getHomeDir() / "fatstore"
+
+# Make sure we have the dir, or create it.
+try:
+  if not existsDir(fatstore): createDir(fatstore)
+except:
+  quit("Could not create " & fatstore & " directory.", 1)
+
+
+# Parse configuration if it exists
+parseConfFile(fatstore / "fatstore.conf")
+
+# Only a command and a path as argument
+let argv = commandLineParams()
+let command = argv[0]
+let filename = argv[1]
+
+
+# Do the deed
+if command == "d" or command == "deflate":
+  deflate(filename)
+elif command == "i" or command == "inflate":
+  inflate(filename)
+else:
+  quit("Unknown command, only (d)eflate or (i)inflate are valid.", 6)
+
+# All good
+quit(0)
--
libgit2 0.22.2