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1 | 1 | # streamclone.py - streaming clone server support for mercurial |
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2 | 2 | # |
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3 | 3 | # Copyright 2006 Vadim Gelfer <vadim.gelfer@gmail.com> |
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4 | 4 | # |
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5 | 5 | # This software may be used and distributed according to the terms |
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6 | 6 | # of the GNU General Public License, incorporated herein by reference. |
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7 | 7 | |
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8 | 8 | from i18n import _ |
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9 | 9 | import os, osutil, stat, util, lock |
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10 | 10 | |
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11 | 11 | # if server supports streaming clone, it advertises "stream" |
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12 | 12 | # capability with value that is version+flags of repo it is serving. |
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13 | 13 | # client only streams if it can read that repo format. |
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14 | 14 | |
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15 | 15 | def walkrepo(root): |
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16 | 16 | '''iterate over metadata files in repository. |
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17 | 17 | walk in natural (sorted) order. |
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18 | 18 | yields 2-tuples: name of .d or .i file, size of file.''' |
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19 | 19 | |
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20 | 20 | strip_count = len(root) + len(os.sep) |
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21 | 21 | def walk(path, recurse): |
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22 | 22 | for e, kind, st in osutil.listdir(path, stat=True): |
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23 | 23 | pe = os.path.join(path, e) |
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24 | 24 | if kind == stat.S_IFDIR: |
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25 | 25 | if recurse: |
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26 | 26 | for x in walk(pe, True): |
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27 | 27 | yield x |
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28 | 28 | else: |
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29 | 29 | if kind != stat.S_IFREG or len(e) < 2: |
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30 | 30 | continue |
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31 | 31 | sfx = e[-2:] |
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32 | 32 | if sfx in ('.d', '.i'): |
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33 | 33 | yield pe[strip_count:], st.st_size |
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34 | 34 | # write file data first |
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35 | 35 | for x in walk(os.path.join(root, 'data'), True): |
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36 | 36 | yield x |
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37 | 37 | # write manifest before changelog |
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38 | 38 | meta = list(walk(root, False)) |
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39 | 39 | meta.sort() |
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40 | 40 | meta.reverse() |
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41 | 41 | for x in meta: |
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42 | 42 | yield x |
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43 | 43 | |
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44 | 44 | # stream file format is simple. |
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45 | 45 | # |
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46 | 46 | # server writes out line that says how many files, how many total |
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47 | 47 | # bytes. separator is ascii space, byte counts are strings. |
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48 | 48 | # |
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49 | 49 | # then for each file: |
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50 | 50 | # |
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51 | 51 | # server writes out line that says file name, how many bytes in |
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52 | 52 | # file. separator is ascii nul, byte count is string. |
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53 | 53 | # |
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54 | 54 | # server writes out raw file data. |
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55 | 55 | |
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56 | 56 | def stream_out(repo, fileobj, untrusted=False): |
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57 | 57 | '''stream out all metadata files in repository. |
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58 | 58 | writes to file-like object, must support write() and optional flush().''' |
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59 | 59 | |
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60 | 60 | if not repo.ui.configbool('server', 'uncompressed', untrusted=untrusted): |
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61 | 61 | fileobj.write('1\n') |
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62 | 62 | return |
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63 | 63 | |
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64 | 64 | # get consistent snapshot of repo. lock during scan so lock not |
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65 | 65 | # needed while we stream, and commits can happen. |
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66 | lock = None | |
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66 | repolock = None | |
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67 | 67 | try: |
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68 | 68 | try: |
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69 | 69 | repolock = repo.lock() |
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70 | 70 | except (lock.LockHeld, lock.LockUnavailable), inst: |
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71 | 71 | repo.ui.warn('locking the repository failed: %s\n' % (inst,)) |
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72 | 72 | fileobj.write('2\n') |
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73 | 73 | return |
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74 | 74 | |
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75 | 75 | fileobj.write('0\n') |
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76 | 76 | repo.ui.debug('scanning\n') |
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77 | 77 | entries = [] |
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78 | 78 | total_bytes = 0 |
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79 | 79 | for name, size in walkrepo(repo.spath): |
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80 | 80 | name = repo.decodefn(util.pconvert(name)) |
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81 | 81 | entries.append((name, size)) |
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82 | 82 | total_bytes += size |
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83 | 83 | finally: |
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84 | 84 | del repolock |
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85 | 85 | |
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86 | 86 | repo.ui.debug('%d files, %d bytes to transfer\n' % |
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87 | 87 | (len(entries), total_bytes)) |
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88 | 88 | fileobj.write('%d %d\n' % (len(entries), total_bytes)) |
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89 | 89 | for name, size in entries: |
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90 | 90 | repo.ui.debug('sending %s (%d bytes)\n' % (name, size)) |
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91 | 91 | fileobj.write('%s\0%d\n' % (name, size)) |
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92 | 92 | for chunk in util.filechunkiter(repo.sopener(name), limit=size): |
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93 | 93 | fileobj.write(chunk) |
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94 | 94 | flush = getattr(fileobj, 'flush', None) |
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95 | 95 | if flush: flush() |
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