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