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README.md
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| 1 | +++ a/README.md |
fat.nim
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| 1 | +++ a/fat.nim | ||
| 1 | +import md5, os, osproc, parseopt2, strutils, parsecfg, streams | ||
| 2 | + | ||
| 3 | +# This is a little utility program for handling large files | ||
| 4 | +# in git repositories. Its inspired by git-fat and s3annex | ||
| 5 | +# but doesn't rely on S3 for storage. | ||
| 6 | +# | ||
| 7 | +# Use "fat d mybigfile" to deflate it before commit. | ||
| 8 | +# Use "fat i mybigfile" to inflate it back to original size. | ||
| 9 | +# | ||
| 10 | +# When deflated the file only has an md5sum string inside it. | ||
| 11 | +# | ||
| 12 | +# The file is copied over into: | ||
| 13 | +# <homedir>/fatstore/<originalfilename>-<md5sum> | ||
| 14 | + | ||
| 15 | +var fatstore, remoteFatstore: string | ||
| 16 | + | ||
| 17 | + | ||
| 18 | +# Load fatstore.conf file, overkill for now but... | ||
| 19 | +proc parseConfFile(filename: string) = | ||
| 20 | + echo filename | ||
| 21 | + var f = newFileStream(filename, fmRead) | ||
| 22 | + if f != nil: | ||
| 23 | + var p: CfgParser | ||
| 24 | + open(p, f, filename) | ||
| 25 | + while true: | ||
| 26 | + var e = next(p) | ||
| 27 | + case e.kind | ||
| 28 | + of cfgEof: | ||
| 29 | + break | ||
| 30 | + of cfgSectionStart: | ||
| 31 | + continue # Ignore | ||
| 32 | + of cfgKeyValuePair: | ||
| 33 | + if e.key == "remote": | ||
| 34 | + remoteFatstore = e.value | ||
| 35 | + else: | ||
| 36 | + quit("Unknown configuration: " & e.key) | ||
| 37 | + of cfgOption: | ||
| 38 | + quit("Unknown configuration: " & e.key) | ||
| 39 | + of cfgError: | ||
| 40 | + quit("Parsing " & filename & ": " & e.msg) | ||
| 41 | + close(p) | ||
| 42 | + | ||
| 43 | + | ||
| 44 | +# Upload a file to the remote master fatstore | ||
| 45 | +proc uploadFile(fatfilename: string) = | ||
| 46 | + if remoteFatstore.isNil: | ||
| 47 | + echo("Remote fatstore not set in configuration file, not uploading content:\n\t" & fatfilename) | ||
| 48 | + return | ||
| 49 | + let errorCode = execCmd("rsync -a " & fatstore / fatfilename & " " & remoteFatstore) | ||
| 50 | + if errorCode != 0: quit("Something went wrong uploading content to " & remoteFatstore, 2) | ||
| 51 | + | ||
| 52 | +# Download a file to the remote master fatstore | ||
| 53 | +proc downloadFile(fatfilename: string) = | ||
| 54 | + if remoteFatstore.isNil: | ||
| 55 | + quit("Remote fatstore not set in configuration file, can not download content:\n\t" & fatfilename) | ||
| 56 | + let errorCode = execCmd("rsync -a " & remoteFatstore / fatfilename & " " & fatstore / "") | ||
| 57 | + if errorCode != 0: quit("Something went wrong downloading " & fatfilename & " from " & remoteFatstore, 3) | ||
| 58 | + | ||
| 59 | + | ||
| 60 | +# Copy content to fatstore, no upload yet. | ||
| 61 | +proc copyToFatstore(filename, fatfilename: string) = | ||
| 62 | + if not existsFile(fatstore / fatfilename): | ||
| 63 | + copyFile(filename, fatstore / fatfilename) | ||
| 64 | + uploadFile(fatfilename) | ||
| 65 | + | ||
| 66 | +# Copy content from fatstore, and downloading first if needed | ||
| 67 | +proc copyFromFatstore(fatfilename, filename: string) = | ||
| 68 | + if not existsFile(fatstore / fatfilename): | ||
| 69 | + downloadFile(fatfilename) | ||
| 70 | + copyFile(fatstore / fatfilename, filename) | ||
| 71 | + | ||
| 72 | + | ||
| 73 | +# Copy original file to fatstore and replace with hash stub in git. | ||
| 74 | +proc deflate(filename: string) = | ||
| 75 | + let content = readFile(filename) | ||
| 76 | + if content[0..4] == "hash:": | ||
| 77 | + quit("File is already deflated, ignored.", 5) | ||
| 78 | + let hash = getMD5(content) | ||
| 79 | + let fatfilename = filename & "-" & hash | ||
| 80 | + copyToFatstore(filename, fatfilename) | ||
| 81 | + writeFile(filename, "hash:" & fatfilename) | ||
| 82 | + | ||
| 83 | +# Parse out hash from hash stub and copy back original content from fatstore. | ||
| 84 | +proc inflate(filename: string) = | ||
| 85 | + var hashfile: File | ||
| 86 | + if not open(hashfile, filename): | ||
| 87 | + quit("Could not open file: " & filename, 4) | ||
| 88 | + let hashline = split(string(readLine(hashfile)), {':'}) | ||
| 89 | + if hashline[0] == "hash": | ||
| 90 | + let fatfilename = hashline[1] | ||
| 91 | + #removeFile(filename) | ||
| 92 | + copyFromFatstore(fatfilename, filename) | ||
| 93 | + else: | ||
| 94 | + quit("File is not a fat file.", 5) | ||
| 95 | + | ||
| 96 | + | ||
| 97 | +################################ main ##################################### | ||
| 98 | + | ||
| 99 | +# Hardwired to "fatstore" directory in home dir. | ||
| 100 | +fatstore = getHomeDir() / "fatstore" | ||
| 101 | + | ||
| 102 | +# Make sure we have the dir, or create it. | ||
| 103 | +try: | ||
| 104 | + if not existsDir(fatstore): createDir(fatstore) | ||
| 105 | +except: | ||
| 106 | + quit("Could not create " & fatstore & " directory.", 1) | ||
| 107 | + | ||
| 108 | + | ||
| 109 | +# Parse configuration if it exists | ||
| 110 | +parseConfFile(fatstore / "fatstore.conf") | ||
| 111 | + | ||
| 112 | +# Only a command and a path as argument | ||
| 113 | +let argv = commandLineParams() | ||
| 114 | +let command = argv[0] | ||
| 115 | +let filename = argv[1] | ||
| 116 | + | ||
| 117 | + | ||
| 118 | +# Do the deed | ||
| 119 | +if command == "d" or command == "deflate": | ||
| 120 | + deflate(filename) | ||
| 121 | +elif command == "i" or command == "inflate": | ||
| 122 | + inflate(filename) | ||
| 123 | +else: | ||
| 124 | + quit("Unknown command, only (d)eflate or (i)inflate are valid.", 6) | ||
| 125 | + | ||
| 126 | +# All good | ||
| 127 | +quit(0) |