Mercurial > hg
annotate tests/test-debugcommands.t @ 32697:19b9fc40cc51
revlog: skeleton support for version 2 revlogs
There are a number of improvements we want to make to revlogs
that will require a new version - version 2. It is unclear what the
full set of improvements will be or when we'll be done with them.
What I do know is that the process will likely take longer than a
single release, will require input from various stakeholders to
evaluate changes, and will have many contentious debates and
bikeshedding.
It is unrealistic to develop revlog version 2 up front: there
are just too many uncertainties that we won't know until things
are implemented and experiments are run. Some changes will also
be invasive and prone to bit rot, so sitting on dozens of patches
is not practical.
This commit introduces skeleton support for version 2 revlogs in
a way that is flexible and not bound by backwards compatibility
concerns.
An experimental repo requirement for denoting revlog v2 has been
added. The requirement string has a sub-version component to it.
This will allow us to declare multiple requirements in the course
of developing revlog v2. Whenever we change the in-development
revlog v2 format, we can tweak the string, creating a new
requirement and locking out old clients. This will allow us to
make as many backwards incompatible changes and experiments to
revlog v2 as we want. In other words, we can land code and make
meaningful progress towards revlog v2 while still maintaining
extreme format flexibility up until the point we freeze the
format and remove the experimental labels.
To enable the new repo requirement, you must supply an experimental
and undocumented config option. But not just any boolean flag
will do: you need to explicitly use a value that no sane person
should ever type. This is an additional guard against enabling
revlog v2 on an installation it shouldn't be enabled on. The
specific scenario I'm trying to prevent is say a user with a
4.4 client with a frozen format enabling the option but then
downgrading to 4.3 and accidentally creating repos with an
outdated and unsupported repo format. Requiring a "challenge"
string should prevent this.
Because the format is not yet finalized and I don't want to take
any chances, revlog v2's version is currently 0xDEAD. I figure
squatting on a value we're likely never to use as an actual revlog
version to mean "internal testing only" is acceptable. And
"dead" is easily recognized as something meaningful.
There is a bunch of cleanup that is needed before work on revlog
v2 begins in earnest. I plan on doing that work once this patch
is accepted and we're comfortable with the idea of starting down
this path.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Fri, 19 May 2017 20:29:11 -0700 |
parents | 7b17f9de6d3e |
children | 75be14993fda |
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1 $ cat << EOF >> $HGRCPATH |
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2 > [format] |
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3 > usegeneraldelta=yes |
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4 > EOF |
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5 |
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6 $ hg init debugrevlog |
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7 $ cd debugrevlog |
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8 $ echo a > a |
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9 $ hg ci -Am adda |
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10 adding a |
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11 $ hg debugrevlog -m |
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12 format : 1 |
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13 flags : inline, generaldelta |
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14 |
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15 revisions : 1 |
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16 merges : 0 ( 0.00%) |
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17 normal : 1 (100.00%) |
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18 revisions : 1 |
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19 full : 1 (100.00%) |
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20 deltas : 0 ( 0.00%) |
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21 revision size : 44 |
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22 full : 44 (100.00%) |
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23 deltas : 0 ( 0.00%) |
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24 |
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25 chunks : 1 |
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26 0x75 (u) : 1 (100.00%) |
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27 chunks size : 44 |
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28 0x75 (u) : 44 (100.00%) |
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29 |
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30 avg chain length : 0 |
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31 max chain length : 0 |
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32 compression ratio : 0 |
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33 |
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34 uncompressed data size (min/max/avg) : 43 / 43 / 43 |
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35 full revision size (min/max/avg) : 44 / 44 / 44 |
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36 delta size (min/max/avg) : 0 / 0 / 0 |
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38 Test debugindex, with and without the --debug flag |
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39 $ hg debugindex a |
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40 rev offset length ..... linkrev nodeid p1 p2 (re) |
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41 0 0 3 .... 0 b789fdd96dc2 000000000000 000000000000 (re) |
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42 $ hg --debug debugindex a |
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43 rev offset length ..... linkrev nodeid p1 p2 (re) |
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44 0 0 3 .... 0 b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 0000000000000000000000000000000000000000 0000000000000000000000000000000000000000 (re) |
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45 $ hg debugindex -f 1 a |
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46 rev flag offset length size ..... link p1 p2 nodeid (re) |
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47 0 0000 0 3 2 .... 0 -1 -1 b789fdd96dc2 (re) |
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48 $ hg --debug debugindex -f 1 a |
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49 rev flag offset length size ..... link p1 p2 nodeid (re) |
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50 0 0000 0 3 2 .... 0 -1 -1 b789fdd96dc2f3bd229c1dd8eedf0fc60e2b68e3 (re) |
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51 |
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52 debugdelta chain basic output |
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53 |
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54 $ hg debugdeltachain -m |
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55 rev chain# chainlen prev delta size rawsize chainsize ratio lindist extradist extraratio |
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56 0 1 1 -1 base 44 43 44 1.02326 44 0 0.00000 |
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57 |
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58 $ hg debugdeltachain -m -T '{rev} {chainid} {chainlen}\n' |
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59 0 1 1 |
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60 |
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61 $ hg debugdeltachain -m -Tjson |
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62 [ |
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63 { |
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64 "chainid": 1, |
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65 "chainlen": 1, |
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66 "chainratio": 1.02325581395, |
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67 "chainsize": 44, |
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68 "compsize": 44, |
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69 "deltatype": "base", |
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70 "extradist": 0, |
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71 "extraratio": 0.0, |
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72 "lindist": 44, |
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73 "prevrev": -1, |
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74 "rev": 0, |
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75 "uncompsize": 43 |
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76 } |
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77 ] |
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78 |
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79 Test max chain len |
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80 $ cat >> $HGRCPATH << EOF |
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81 > [format] |
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82 > maxchainlen=4 |
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83 > EOF |
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84 |
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85 $ printf "This test checks if maxchainlen config value is respected also it can serve as basic test for debugrevlog -d <file>.\n" >> a |
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86 $ hg ci -m a |
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87 $ printf "b\n" >> a |
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88 $ hg ci -m a |
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89 $ printf "c\n" >> a |
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90 $ hg ci -m a |
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91 $ printf "d\n" >> a |
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92 $ hg ci -m a |
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93 $ printf "e\n" >> a |
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94 $ hg ci -m a |
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95 $ printf "f\n" >> a |
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96 $ hg ci -m a |
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97 $ printf 'g\n' >> a |
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98 $ hg ci -m a |
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99 $ printf 'h\n' >> a |
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100 $ hg ci -m a |
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101 $ hg debugrevlog -d a |
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102 # rev p1rev p2rev start end deltastart base p1 p2 rawsize totalsize compression heads chainlen |
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103 0 -1 -1 0 ??? 0 0 0 0 ??? ???? ? 1 0 (glob) |
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104 1 0 -1 ??? ??? 0 0 0 0 ??? ???? ? 1 1 (glob) |
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105 2 1 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 2 (glob) |
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106 3 2 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 3 (glob) |
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107 4 3 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 4 (glob) |
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108 5 4 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 0 (glob) |
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109 6 5 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 1 (glob) |
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110 7 6 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 2 (glob) |
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111 8 7 -1 ??? ??? ??? ??? ??? 0 ??? ???? ? 1 3 (glob) |
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112 |
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113 Test WdirUnsupported exception |
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114 |
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115 $ hg debugdata -c ffffffffffffffffffffffffffffffffffffffff |
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116 abort: working directory revision cannot be specified |
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117 [255] |
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118 |
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119 Test cache warming command |
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120 |
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121 $ rm -rf .hg/cache/ |
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122 $ hg debugupdatecaches --debug |
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123 updating the branch cache |
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124 $ ls -r .hg/cache/* |
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125 .hg/cache/rbc-revs-v1 |
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126 .hg/cache/rbc-names-v1 |
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127 .hg/cache/branch2-served |
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128 |
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129 $ cd .. |
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130 |
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131 Test internal debugstacktrace command |
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132 |
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133 $ cat > debugstacktrace.py << EOF |
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134 > from mercurial.util import debugstacktrace, dst, sys |
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135 > def f(): |
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136 > debugstacktrace(f=sys.stdout) |
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137 > g() |
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138 > def g(): |
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139 > dst('hello from g\\n', skip=1) |
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140 > h() |
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141 > def h(): |
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142 > dst('hi ...\\nfrom h hidden in g', 1, depth=2) |
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143 > f() |
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144 > EOF |
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145 $ python debugstacktrace.py |
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146 stacktrace at: |
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147 debugstacktrace.py:10 in * (glob) |
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148 debugstacktrace.py:3 in f |
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149 hello from g at: |
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150 debugstacktrace.py:10 in * (glob) |
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151 debugstacktrace.py:4 in f |
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152 hi ... |
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153 from h hidden in g at: |
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154 debugstacktrace.py:4 in f |
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155 debugstacktrace.py:7 in g |