Mercurial > hg
annotate tests/test-rollback.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outdated and unsupported repo format.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 | 3ed26ba54685 |
children | 2debf1e3cfa4 |
rev | line source |
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1 setup repo |
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2 $ hg init t |
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3 $ cd t |
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4 $ echo a > a |
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5 $ hg commit -Am'add a' |
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6 adding a |
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7 $ hg verify |
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8 checking changesets |
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9 checking manifests |
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10 crosschecking files in changesets and manifests |
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11 checking files |
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12 1 files, 1 changesets, 1 total revisions |
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13 $ hg parents |
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14 changeset: 0:1f0dee641bb7 |
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15 tag: tip |
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16 user: test |
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17 date: Thu Jan 01 00:00:00 1970 +0000 |
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18 summary: add a |
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19 |
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20 |
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21 rollback to null revision |
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22 $ hg status |
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23 $ hg rollback |
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24 repository tip rolled back to revision -1 (undo commit) |
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25 working directory now based on revision -1 |
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26 $ hg verify |
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27 checking changesets |
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28 checking manifests |
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29 crosschecking files in changesets and manifests |
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30 checking files |
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31 0 files, 0 changesets, 0 total revisions |
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32 $ hg parents |
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33 $ hg status |
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34 A a |
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35 |
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36 Two changesets this time so we rollback to a real changeset |
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37 $ hg commit -m'add a again' |
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38 $ echo a >> a |
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39 $ hg commit -m'modify a' |
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40 |
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41 Test issue 902 (current branch is preserved) |
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42 $ hg branch test |
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43 marked working directory as branch test |
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45 $ hg rollback |
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46 repository tip rolled back to revision 0 (undo commit) |
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47 working directory now based on revision 0 |
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48 $ hg branch |
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49 default |
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50 |
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51 Test issue 1635 (commit message saved) |
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52 $ cat .hg/last-message.txt ; echo |
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53 modify a |
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54 |
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55 Test rollback of hg before issue 902 was fixed |
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56 |
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57 $ hg commit -m "test3" |
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58 $ hg branch test |
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59 marked working directory as branch test |
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61 $ rm .hg/undo.branch |
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62 $ hg rollback |
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63 repository tip rolled back to revision 0 (undo commit) |
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64 named branch could not be reset: current branch is still 'test' |
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65 working directory now based on revision 0 |
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66 $ hg branch |
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67 test |
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68 |
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69 working dir unaffected by rollback: do not restore dirstate et. al. |
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70 $ hg log --template '{rev} {branch} {desc|firstline}\n' |
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71 0 default add a again |
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72 $ hg status |
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73 M a |
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74 $ hg bookmark foo |
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75 $ hg commit -m'modify a again' |
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76 $ echo b > b |
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77 $ hg bookmark bar -r default #making bar active, before the transaction |
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78 $ hg commit -Am'add b' |
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79 adding b |
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80 $ hg log --template '{rev} {branch} {desc|firstline}\n' |
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81 2 test add b |
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82 1 test modify a again |
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83 0 default add a again |
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84 $ hg update bar |
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85 1 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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86 (activating bookmark bar) |
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87 $ cat .hg/undo.branch ; echo |
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88 test |
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89 $ hg rollback -f |
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90 repository tip rolled back to revision 1 (undo commit) |
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91 $ hg id -n |
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92 0 |
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93 $ hg branch |
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94 default |
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95 $ cat .hg/bookmarks.current ; echo |
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96 bar |
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97 $ hg bookmark --delete foo bar |
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98 |
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99 rollback by pretxncommit saves commit message (issue1635) |
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100 |
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101 $ echo a >> a |
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102 $ hg --config hooks.pretxncommit=false commit -m"precious commit message" |
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103 transaction abort! |
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104 rollback completed |
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105 abort: pretxncommit hook exited with status * (glob) |
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106 [255] |
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107 $ cat .hg/last-message.txt ; echo |
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108 precious commit message |
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109 |
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110 same thing, but run $EDITOR |
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111 |
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112 $ cat > editor.sh << '__EOF__' |
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113 > echo "another precious commit message" > "$1" |
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114 > __EOF__ |
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115 $ HGEDITOR="\"sh\" \"`pwd`/editor.sh\"" hg --config hooks.pretxncommit=false commit 2>&1 |
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116 note: commit message saved in .hg/last-message.txt |
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117 transaction abort! |
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118 rollback completed |
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119 abort: pretxncommit hook exited with status * (glob) |
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120 [255] |
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121 $ cat .hg/last-message.txt |
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122 another precious commit message |
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123 |
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124 test rollback on served repository |
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125 |
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126 #if serve |
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127 $ hg commit -m "precious commit message" |
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128 $ hg serve -p $HGPORT -d --pid-file=hg.pid -A access.log -E errors.log |
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129 $ cat hg.pid >> $DAEMON_PIDS |
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130 $ cd .. |
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131 $ hg clone http://localhost:$HGPORT u |
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132 requesting all changes |
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133 adding changesets |
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134 adding manifests |
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135 adding file changes |
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136 added 3 changesets with 2 changes to 1 files (+1 heads) |
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137 updating to branch default |
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138 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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139 $ cd u |
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140 $ hg id default |
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141 068774709090 |
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142 |
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143 now rollback and observe that 'hg serve' reloads the repository and |
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144 presents the correct tip changeset: |
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145 |
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146 $ hg -R ../t rollback |
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147 repository tip rolled back to revision 1 (undo commit) |
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148 working directory now based on revision 0 |
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149 $ hg id default |
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150 791dd2169706 |
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151 |
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152 $ killdaemons.py |
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153 #endif |
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154 |
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155 update to older changeset and then refuse rollback, because |
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156 that would lose data (issue2998) |
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157 $ cd ../t |
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158 $ hg -q update |
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159 $ rm `hg status -un` |
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160 $ template='{rev}:{node|short} [{branch}] {desc|firstline}\n' |
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161 $ echo 'valuable new file' > b |
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162 $ echo 'valuable modification' >> a |
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163 $ hg commit -A -m'a valuable change' |
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164 adding b |
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165 $ hg update 0 |
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166 1 files updated, 0 files merged, 1 files removed, 0 files unresolved |
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167 $ hg rollback |
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168 abort: rollback of last commit while not checked out may lose data |
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169 (use -f to force) |
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170 [255] |
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171 $ hg tip -q |
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172 2:4d9cd3795eea |
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173 $ hg rollback -f |
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174 repository tip rolled back to revision 1 (undo commit) |
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175 $ hg status |
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176 $ hg log --removed b # yep, it's gone |
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177 |
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178 same again, but emulate an old client that doesn't write undo.desc |
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179 $ hg -q update |
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180 $ echo 'valuable modification redux' >> a |
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181 $ hg commit -m'a valuable change redux' |
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182 $ rm .hg/undo.desc |
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183 $ hg update 0 |
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184 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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185 $ hg rollback |
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186 rolling back unknown transaction |
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187 $ cat a |
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188 a |
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189 |
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190 corrupt journal test |
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191 $ echo "foo" > .hg/store/journal |
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192 $ hg recover |
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193 rolling back interrupted transaction |
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194 couldn't read journal entry 'foo\n'! |
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195 checking changesets |
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196 checking manifests |
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197 crosschecking files in changesets and manifests |
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198 checking files |
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199 1 files, 2 changesets, 2 total revisions |
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200 |
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201 rollback disabled by config |
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202 $ cat >> $HGRCPATH <<EOF |
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203 > [ui] |
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204 > rollback = false |
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205 > EOF |
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206 $ echo narf >> pinky-sayings.txt |
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207 $ hg add pinky-sayings.txt |
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208 $ hg ci -m 'First one.' |
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209 $ hg rollback |
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210 abort: rollback is disabled because it is unsafe |
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211 (see `hg help -v rollback` for information) |
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212 [255] |