Mercurial > hg
annotate tests/test-racy-mutations.t @ 49991:3997c64eff8b
test: use a more direct approach to test racy mutation
The previous test was relying on implementation details and harder to maintain.
The new version is closer to the initial intend : "What happens the file get overwritten from under the current process"
This change is motivated by further changes around the transaction and dirstate
logic that would break the fragile equilibrium that existed before this patch.
Making this change early make it easier to review on its own and remove noise
in future larger changes.
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Tue, 07 Feb 2023 13:14:59 +0100 |
parents | c827bb7b5806 |
children | 28dfb2df4ab9 |
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1 #testcases skip-detection fail-if-detected |
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2 |
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3 Test situations that "should" only be reproducible: |
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4 - on networked filesystems, or |
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5 - user using `hg debuglocks` to eliminate the lock file, or |
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6 - something (that doesn't respect the lock file) writing to the .hg directory |
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7 while we're running |
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8 |
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9 |
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10 Initial setup |
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11 ------------- |
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12 |
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13 $ hg init base-repo |
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14 $ cd base-repo |
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15 |
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16 $ cat > "$TESTTMP_FORWARD_SLASH/waitlock_editor.sh" <<EOF |
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17 > [ -n "\${WAITLOCK_ANNOUNCE:-}" ] && touch "\${WAITLOCK_ANNOUNCE}" |
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18 > f="\${WAITLOCK_FILE}" |
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19 > start=\`date +%s\` |
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20 > timeout=5 |
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21 > "$RUNTESTDIR_FORWARD_SLASH/testlib/wait-on-file" "\$timeout" "\$f" |
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22 > if [ \$# -gt 1 ]; then |
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23 > cat "\$@" |
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24 > fi |
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25 > EOF |
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26 |
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27 Things behave differently if we don't already have a 00changelog.i file when |
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28 this all starts, so let's make one. |
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29 |
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30 $ echo r0 > r0 |
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31 $ hg commit -qAm 'r0' |
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32 |
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33 $ cd .. |
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34 $ cp -R base-repo main-client |
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35 $ cp -R base-repo racing-client |
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36 |
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37 $ mkdir sync |
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38 $ EDITOR_STARTED="$TESTTMP_FORWARD_SLASH/sync/.editor_started" |
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39 $ MISCHIEF_MANAGED="$TESTTMP_FORWARD_SLASH/sync/.mischief_managed" |
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40 $ JOBS_FINISHED="$TESTTMP_FORWARD_SLASH/sync/.jobs_finished" |
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41 |
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42 Actual test |
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43 ----------- |
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44 |
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45 Start an hg commit that will take a while |
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46 |
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47 $ cd main-client |
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48 |
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49 #if fail-if-detected |
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50 $ cat >> $HGRCPATH << EOF |
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51 > [debug] |
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52 > revlog.verifyposition.changelog = fail |
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53 > EOF |
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54 #endif |
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55 |
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56 $ echo foo > foo |
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57 $ ( |
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58 > unset HGEDITOR; |
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59 > WAITLOCK_ANNOUNCE="${EDITOR_STARTED}" \ |
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60 > WAITLOCK_FILE="${MISCHIEF_MANAGED}" \ |
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61 > hg commit -qAm 'r1 (foo)' --edit foo \ |
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62 > --config ui.editor="sh $TESTTMP_FORWARD_SLASH/waitlock_editor.sh" \ |
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63 > > .foo_commit_out 2>&1 ;\ |
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64 > touch "${JOBS_FINISHED}" |
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65 > ) & |
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66 |
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67 Wait for the "editor" to actually start |
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68 $ sh "$RUNTESTDIR_FORWARD_SLASH/testlib/wait-on-file" 5 "${EDITOR_STARTED}" |
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69 |
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70 |
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71 Do a concurrent edition |
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72 $ cd ../racing-client |
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73 $ touch ../pre-race |
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74 $ sleep 1 |
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75 $ echo bar > bar |
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76 $ hg --repository ../racing-client commit -qAm 'r2 (bar)' bar |
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77 $ hg --repository ../racing-client debugrevlogindex -c |
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78 rev linkrev nodeid p1 p2 |
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79 0 0 222799e2f90b 000000000000 000000000000 |
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80 1 1 6f124f6007a0 222799e2f90b 000000000000 |
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81 |
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82 We simulate an network FS race by overwriting raced repo content with the new |
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83 content of the files changed in the racing repository |
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84 |
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85 $ for x in `find . -type f -newer ../pre-race`; do |
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86 > cp $x ../main-client/$x |
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87 > done |
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88 $ cd ../main-client |
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89 |
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90 Awaken the editor from that first commit |
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91 $ touch "${MISCHIEF_MANAGED}" |
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92 And wait for it to finish |
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93 $ WAITLOCK_FILE="${JOBS_FINISHED}" sh "$TESTTMP_FORWARD_SLASH/waitlock_editor.sh" |
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94 |
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95 #if skip-detection |
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96 (Ensure there was no output) |
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97 $ cat .foo_commit_out |
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98 And observe a corrupted repository -- rev 2's linkrev is 1, which should never |
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99 happen for the changelog (the linkrev should always refer to itself). |
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100 $ hg debugrevlogindex -c |
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101 rev linkrev nodeid p1 p2 |
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102 0 0 222799e2f90b 000000000000 000000000000 |
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103 1 1 6f124f6007a0 222799e2f90b 000000000000 |
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104 2 1 ac80e6205bb2 222799e2f90b 000000000000 |
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105 #endif |
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106 |
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107 #if fail-if-detected |
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108 $ cat .foo_commit_out |
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109 transaction abort! |
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110 rollback completed |
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111 note: commit message saved in .hg/last-message.txt |
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112 note: use 'hg commit --logfile .hg/last-message.txt --edit' to reuse it |
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113 abort: 00changelog.i: file cursor at position 249, expected 121 |
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114 And no corruption in the changelog. |
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115 $ hg debugrevlogindex -c |
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116 rev linkrev nodeid p1 p2 |
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117 0 0 222799e2f90b 000000000000 000000000000 |
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118 1 1 6f124f6007a0 222799e2f90b 000000000000 (missing-correct-output !) |
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119 And, because of transactions, there's none in the manifestlog either. |
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120 $ hg debugrevlogindex -m |
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121 rev linkrev nodeid p1 p2 |
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122 0 0 7b7020262a56 000000000000 000000000000 |
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123 1 1 ad3fe36d86d9 7b7020262a56 000000000000 |
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124 #endif |
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125 |