Mercurial > hg
annotate mercurial/help/revsets.txt @ 26755:bb0b955d050d
streamclone: support for producing and consuming stream clone bundles
Up to this point, stream clones only existed as a dynamically generated
data format produced and consumed during streaming clones. In order to
support this efficient cloning format with the clone bundles feature, we
need a more formal, on disk representation of the streaming clone data.
This patch introduces a new "bundle" type for streaming clones. Unlike
existing bundles, it does not contain changegroup data. It does,
however, share the same concepts like the 4 byte header which identifies
the type of data that follows and the 2 byte abbreviation for
compression types (of which only "UN" is currently supported).
The new bundle format is essentially the existing stream clone version 1
data format with some headers at the beginning.
Content negotiation at stream clone request time checked for repository
format/requirements compatibility before initiating a stream clone. We
can't do active content negotiation when using clone bundles. So, we put
this set of requirements inside the payload so consumers have a built-in
mechanism for checking compatibility before reading and applying lots of
data. Of course, we will also advertise this requirements set in clone
bundles. But that's for another patch.
We currently don't have a mechanism to produce and consume this new
bundle format. This will be implemented in upcoming patches.
It's worth noting that if a legacy client attempts to `hg unbundle` a
stream clone bundle (with the "HGS1" header), it will abort with:
"unknown bundle version S1," which seems appropriate.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Sat, 17 Oct 2015 11:14:52 -0700 |
parents | 3a4d8a6ce432 |
children | 97811ff79647 |
rev | line source |
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11382 | 1 Mercurial supports a functional language for selecting a set of |
2 revisions. | |
3 | |
4 The language supports a number of predicates which are joined by infix | |
5 operators. Parenthesis can be used for grouping. | |
6 | |
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7 Identifiers such as branch names may need quoting with single or |
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8 double quotes if they contain characters like ``-`` or if they match |
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9 one of the predefined predicates. |
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10 |
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11 Special characters can be used in quoted identifiers by escaping them, |
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12 e.g., ``\n`` is interpreted as a newline. To prevent them from being |
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13 interpreted, strings can be prefixed with ``r``, e.g. ``r'...'``. |
11382 | 14 |
15 There is a single prefix operator: | |
16 | |
17 ``not x`` | |
18 Changesets not in x. Short form is ``! x``. | |
19 | |
20 These are the supported infix operators: | |
21 | |
22 ``x::y`` | |
23 A DAG range, meaning all changesets that are descendants of x and | |
24 ancestors of y, including x and y themselves. If the first endpoint | |
25 is left out, this is equivalent to ``ancestors(y)``, if the second | |
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26 is left out it is equivalent to ``descendants(x)``. |
11382 | 27 |
28 An alternative syntax is ``x..y``. | |
29 | |
30 ``x:y`` | |
31 All changesets with revision numbers between x and y, both | |
32 inclusive. Either endpoint can be left out, they default to 0 and | |
33 tip. | |
34 | |
35 ``x and y`` | |
36 The intersection of changesets in x and y. Short form is ``x & y``. | |
37 | |
38 ``x or y`` | |
39 The union of changesets in x and y. There are two alternative short | |
40 forms: ``x | y`` and ``x + y``. | |
41 | |
42 ``x - y`` | |
43 Changesets in x but not in y. | |
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44 |
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45 ``x^n`` |
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46 The nth parent of x, n == 0, 1, or 2. |
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47 For n == 0, x; for n == 1, the first parent of each changeset in x; |
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48 for n == 2, the second parent of changeset in x. |
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49 |
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50 ``x~n`` |
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51 The nth first ancestor of x; ``x~0`` is x; ``x~3`` is ``x^^^``. |
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52 |
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53 There is a single postfix operator: |
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54 |
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55 ``x^`` |
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56 Equivalent to ``x^1``, the first parent of each changeset in x. |
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57 |
11382 | 58 |
59 The following predicates are supported: | |
60 | |
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61 .. predicatesmarker |
11382 | 62 |
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63 New predicates (known as "aliases") can be defined, using any combination of |
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64 existing predicates or other aliases. An alias definition looks like:: |
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65 |
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66 <alias> = <definition> |
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67 |
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68 in the ``revsetalias`` section of a Mercurial configuration file. Arguments |
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69 of the form `$1`, `$2`, etc. are substituted from the alias into the |
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70 definition. |
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71 |
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72 For example, |
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73 |
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74 :: |
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75 |
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76 [revsetalias] |
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77 h = heads() |
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78 d($1) = sort($1, date) |
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79 rs($1, $2) = reverse(sort($1, $2)) |
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80 |
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81 defines three aliases, ``h``, ``d``, and ``rs``. ``rs(0:tip, author)`` is |
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82 exactly equivalent to ``reverse(sort(0:tip, author))``. |
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83 |
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84 An infix operator ``##`` can concatenate strings and identifiers into |
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85 one string. For example:: |
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86 |
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87 [revsetalias] |
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88 issue($1) = grep(r'\bissue[ :]?' ## $1 ## r'\b|\bbug\(' ## $1 ## r'\)') |
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89 |
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90 ``issue(1234)`` is equivalent to ``grep(r'\bissue[ :]?1234\b|\bbug\(1234\)')`` |
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91 in this case. This matches against all of "issue 1234", "issue:1234", |
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92 "issue1234" and "bug(1234)". |
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93 |
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94 All other prefix, infix and postfix operators have lower priority than |
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95 ``##``. For example, ``$1 ## $2~2`` is equivalent to ``($1 ## $2)~2``. |
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96 |
11382 | 97 Command line equivalents for :hg:`log`:: |
98 | |
99 -f -> ::. | |
100 -d x -> date(x) | |
101 -k x -> keyword(x) | |
102 -m -> merge() | |
103 -u x -> user(x) | |
104 -b x -> branch(x) | |
105 -P x -> !::x | |
106 -l x -> limit(expr, x) | |
107 | |
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108 Some sample queries: |
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109 |
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110 - Changesets on the default branch:: |
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111 |
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112 hg log -r "branch(default)" |
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113 |
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114 - Changesets on the default branch since tag 1.5 (excluding merges):: |
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115 |
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116 hg log -r "branch(default) and 1.5:: and not merge()" |
11382 | 117 |
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118 - Open branch heads:: |
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119 |
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120 hg log -r "head() and not closed()" |
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121 |
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122 - Changesets between tags 1.3 and 1.5 mentioning "bug" that affect |
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123 ``hgext/*``:: |
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124 |
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125 hg log -r "1.3::1.5 and keyword(bug) and file('hgext/*')" |
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126 |
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127 - Changesets committed in May 2008, sorted by user:: |
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128 |
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129 hg log -r "sort(date('May 2008'), user)" |
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130 |
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131 - Changesets mentioning "bug" or "issue" that are not in a tagged |
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132 release:: |
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133 |
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134 hg log -r "(keyword(bug) or keyword(issue)) and not ancestors(tag())" |