Mercurial > hg > mercurial-crew-with-dirclash
annotate mercurial/manifest.py @ 2320:dbdce3b99988
fix parsing of tags. make parse errors useful. add new tag tests.
old code read every head of .hgtags. delete and recreate of .hgtags gave
new head, but if error in deleted rev, .hgtags had error messages every
time it was parsed. this was very hard to fix, because deleted revs hard
to get back and update, needed merges too.
new code reads .hgtags on every head. advantage is if parse error
happens with new code, is possible to fix them by editing .hgtags on a
head and committing.
NOTE: new code uses binary search of manifest of each head to be fast,
but still much slower than old code. best thing would be to have delete
record stored in filelog so we never touch manifest. could find live
heads directly from filelog. this is more work than i want now.
new tests check for parse of tags on different heads, and inaccessible
heads created by delete and recreate of .hgtags.
author | Vadim Gelfer <vadim.gelfer@gmail.com> |
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date | Thu, 18 May 2006 23:31:12 -0700 |
parents | 8a1e2a9c7013 |
children | fe1689273f84 |
rev | line source |
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1089 | 1 # manifest.py - manifest revision class for mercurial |
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2 # |
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3 # Copyright 2005 Matt Mackall <mpm@selenic.com> |
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4 # |
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5 # This software may be used and distributed according to the terms |
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6 # of the GNU General Public License, incorporated herein by reference. |
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7 |
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8 import struct |
262 | 9 from revlog import * |
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10 from i18n import gettext as _ |
262 | 11 from demandload import * |
1534 | 12 demandload(globals(), "bisect array") |
79 | 13 |
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14 class manifest(revlog): |
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15 def __init__(self, opener, defversion=REVLOGV0): |
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16 self.mapcache = None |
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17 self.listcache = None |
2072 | 18 revlog.__init__(self, opener, "00manifest.i", "00manifest.d", |
19 defversion) | |
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20 |
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21 def read(self, node): |
313 | 22 if node == nullid: return {} # don't upset local cache |
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23 if self.mapcache and self.mapcache[0] == node: |
561 | 24 return self.mapcache[1] |
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25 text = self.revision(node) |
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26 map = {} |
276 | 27 flag = {} |
1534 | 28 self.listcache = array.array('c', text) |
29 lines = text.splitlines(1) | |
30 for l in lines: | |
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31 (f, n) = l.split('\0') |
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32 map[f] = bin(n[:40]) |
276 | 33 flag[f] = (n[40:-1] == "x") |
34 self.mapcache = (node, map, flag) | |
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35 return map |
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36 |
276 | 37 def readflags(self, node): |
313 | 38 if node == nullid: return {} # don't upset local cache |
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39 if not self.mapcache or self.mapcache[0] != node: |
276 | 40 self.read(node) |
41 return self.mapcache[2] | |
42 | |
1534 | 43 def diff(self, a, b): |
44 return mdiff.textdiff(str(a), str(b)) | |
45 | |
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46 def _search(self, m, s, lo=0, hi=None): |
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47 '''return a tuple (start, end) that says where to find s within m. |
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48 |
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49 If the string is found m[start:end] are the line containing |
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50 that string. If start == end the string was not found and |
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51 they indicate the proper sorted insertion point. This was |
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52 taken from bisect_left, and modified to find line start/end as |
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53 it goes along. |
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54 |
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55 m should be a buffer or a string |
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56 s is a string''' |
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57 def advance(i, c): |
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58 while i < lenm and m[i] != c: |
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59 i += 1 |
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60 return i |
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61 lenm = len(m) |
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62 if not hi: |
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63 hi = lenm |
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64 while lo < hi: |
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65 mid = (lo + hi) // 2 |
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66 start = mid |
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67 while start > 0 and m[start-1] != '\n': |
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68 start -= 1 |
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69 end = advance(start, '\0') |
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70 if m[start:end] < s: |
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71 # we know that after the null there are 40 bytes of sha1 |
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72 # this translates to the bisect lo = mid + 1 |
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73 lo = advance(end + 40, '\n') + 1 |
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74 else: |
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75 # this translates to the bisect hi = mid |
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76 hi = start |
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77 end = advance(lo, '\0') |
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78 found = m[lo:end] |
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79 if cmp(s, found) == 0: |
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80 # we know that after the null there are 40 bytes of sha1 |
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81 end = advance(end + 40, '\n') |
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82 return (lo, end+1) |
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83 else: |
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84 return (lo, lo) |
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85 |
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86 def find(self, node, f): |
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87 '''look up entry for a single file efficiently. |
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88 return (node, flag) pair if found, (None, None) if not.''' |
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89 if self.mapcache and node == self.mapcache[0]: |
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90 return self.mapcache[1].get(f), self.mapcache[2].get(f) |
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91 text = self.revision(node) |
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92 start, end = self._search(text, f) |
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93 if start == end: |
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94 return None, None |
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95 l = text[start:end] |
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96 f, n = l.split('\0') |
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97 return bin(n[:40]), n[40:-1] == 'x' |
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98 |
741 | 99 def add(self, map, flags, transaction, link, p1=None, p2=None, |
100 changed=None): | |
644 | 101 # apply the changes collected during the bisect loop to our addlist |
1534 | 102 # return a delta suitable for addrevision |
103 def addlistdelta(addlist, x): | |
104 # start from the bottom up | |
644 | 105 # so changes to the offsets don't mess things up. |
1534 | 106 i = len(x) |
644 | 107 while i > 0: |
108 i -= 1 | |
1534 | 109 start = x[i][0] |
110 end = x[i][1] | |
111 if x[i][2]: | |
112 addlist[start:end] = array.array('c', x[i][2]) | |
644 | 113 else: |
114 del addlist[start:end] | |
1534 | 115 return "".join([struct.pack(">lll", d[0], d[1], len(d[2])) + d[2] \ |
116 for d in x ]) | |
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117 |
644 | 118 # if we're using the listcache, make sure it is valid and |
119 # parented by the same node we're diffing against | |
741 | 120 if not changed or not self.listcache or not p1 or \ |
121 self.mapcache[0] != p1: | |
644 | 122 files = map.keys() |
123 files.sort() | |
124 | |
1651 | 125 # if this is changed to support newlines in filenames, |
126 # be sure to check the templates/ dir again (especially *-raw.tmpl) | |
1534 | 127 text = ["%s\000%s%s\n" % |
644 | 128 (f, hex(map[f]), flags[f] and "x" or '') |
129 for f in files] | |
1534 | 130 self.listcache = array.array('c', "".join(text)) |
644 | 131 cachedelta = None |
132 else: | |
1534 | 133 addlist = self.listcache |
644 | 134 |
135 # combine the changed lists into one list for sorting | |
136 work = [[x, 0] for x in changed[0]] | |
137 work[len(work):] = [[x, 1] for x in changed[1]] | |
138 work.sort() | |
139 | |
140 delta = [] | |
1534 | 141 dstart = None |
142 dend = None | |
143 dline = [""] | |
144 start = 0 | |
145 # zero copy representation of addlist as a buffer | |
146 addbuf = buffer(addlist) | |
644 | 147 |
1534 | 148 # start with a readonly loop that finds the offset of |
149 # each line and creates the deltas | |
644 | 150 for w in work: |
151 f = w[0] | |
741 | 152 # bs will either be the index of the item or the insert point |
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153 start, end = self._search(addbuf, f, start) |
644 | 154 if w[1] == 0: |
741 | 155 l = "%s\000%s%s\n" % (f, hex(map[f]), |
156 flags[f] and "x" or '') | |
644 | 157 else: |
1534 | 158 l = "" |
159 if start == end and w[1] == 1: | |
160 # item we want to delete was not found, error out | |
161 raise AssertionError( | |
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162 _("failed to remove %s from manifest\n") % f) |
1534 | 163 if dstart != None and dstart <= start and dend >= start: |
164 if dend < end: | |
165 dend = end | |
166 if l: | |
167 dline.append(l) | |
644 | 168 else: |
1534 | 169 if dstart != None: |
170 delta.append([dstart, dend, "".join(dline)]) | |
171 dstart = start | |
172 dend = end | |
173 dline = [l] | |
644 | 174 |
1534 | 175 if dstart != None: |
176 delta.append([dstart, dend, "".join(dline)]) | |
177 # apply the delta to the addlist, and get a delta for addrevision | |
178 cachedelta = addlistdelta(addlist, delta) | |
644 | 179 |
1534 | 180 # the delta is only valid if we've been processing the tip revision |
181 if self.mapcache[0] != self.tip(): | |
182 cachedelta = None | |
183 self.listcache = addlist | |
184 | |
185 n = self.addrevision(buffer(self.listcache), transaction, link, p1, \ | |
186 p2, cachedelta) | |
302 | 187 self.mapcache = (n, map, flags) |
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188 |
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189 return n |