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Change the size of the short hash representation...
Change the size of the short hash representation -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Change the size of the short hash representation First note that this number doesn't really matter, as we always check for ambiguous short hash ids. Here's the math on collision probability: >>> import math >>> def p(f, n): return 1 - (1 / math.exp(n**2/(2*f))) ... >>> p(2**32, 30000.0) 0.09947179164613551 # with 30000 changesets (BKCVS), we have a 9% chance >>> p(2**32, 65000.0) 0.38850881217977273 # and with a full import from BK, we'd have a 39% chance >>> p(2**40, 1e6) 0.36539171908447321 # we'd like to be "safe" for 1M csets, so 40 isn't enough >>> p(2**48, 1e6) 0.001774780051374103 # But 48 looks good >>> p(2**48, 1e7) 0.16275260939624481 >>> p(2**48, 5e6) 0.043437281083569146 >>> p(2**48, 2e6) 0.0070802434913129764 >>> p(2**48, 3e6) 0.01586009440574343 manifest hash: 24d9f928a463f46708b0e11fb781d5a241851424 -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.0 (GNU/Linux) iD8DBQFCsQoMywK+sNU5EO8RAoBBAJwII9GV6dT9QUOYAk3gZGw9z0JvjACfSI4q IFnTu1F7P5OuLelO1GsM8Bs= =CNWk -----END PGP SIGNATURE-----
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test-copy.out
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+ hg init
+ echo a
+ hg add a
+ hg commit -t 1 -u test -d '0 0'
+ hg status
? .out
+ cp a b
+ hg copy a b
+ hg status
A b
? .out
+ hg -d commit -t 2 -u test -d '0 0'
b
b: copy a:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
+ hg history
changeset: 1:3b5b84850bbed12e8ff8c1b87b32dc93c59ae6d8
user: test
date: Wed Dec 31 16:00:00 1969
summary: 2
changeset: 0:c19d34741b0a4ced8e4ba74bb834597d5193851e
user: test
date: Wed Dec 31 16:00:00 1969
summary: 1
+ hg log a
revision: 0:b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3
changeset: 0:c19d34741b0a4ced8e4ba74bb834597d5193851e
user: test
date: Wed Dec 31 16:00:00 1969
summary: 1
+ hexdump -C .hg/data/b.d
00000000 75 01 0a 63 6f 70 79 72 65 76 3a 20 62 37 38 39 |u..copyrev: b789|
00000010 66 64 64 39 36 64 63 32 66 33 62 64 32 32 39 63 |fdd96dc2f3bd229c|
00000020 31 64 64 38 65 65 64 66 30 66 63 36 30 65 32 62 |1dd8eedf0fc60e2b|
00000030 36 38 65 33 0a 63 6f 70 79 3a 20 61 0a 01 0a 61 |68e3.copy: a...a|
00000040 0a |.|
00000041
+ hg cat b
+ md5sum
60b725f10c9c85c70d97880dfe8191b3 -
+ hg cat a
+ md5sum
60b725f10c9c85c70d97880dfe8191b3 -
+ hg verify
checking changesets
checking manifests
crosschecking files in changesets and manifests
checking files
2 files, 2 changesets, 2 total revisions