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==============================================================================
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Check potential race conditions between a dirstate's read and other operations
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==============================================================================
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#testcases dirstate-v1 dirstate-v2-append dirstate-v2-rewrite
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#testcases pre-all-read pre-some-read
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Some commands, like `hg status`, do not need to take the wlock but need to
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access dirstate data.
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Other commands might update the dirstate data while this happens.
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This can create issues if repository data is read in the wrong order, or for
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the dirstate-v2 format where the data is contained in multiple files.
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This test file is meant to test various cases where such parallel operations
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happen and make sure the reading process behaves fine. We do so with a `hg
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status` command since it is probably the most advanced of such read-only
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command.
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It bears simililarity with `tests/test-dirstate-status-race.t ` but tests a
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different type of race.
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Setup
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=====
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$ cat >> $HGRCPATH << EOF
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> [storage]
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> dirstate-v2.slow-path=allow
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> EOF
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#if no-dirstate-v1
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$ cat >> $HGRCPATH << EOF
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> [format]
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> use-dirstate-v2=yes
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> EOF
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#else
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$ cat >> $HGRCPATH << EOF
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> [format]
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> use-dirstate-v2=no
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> EOF
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#endif
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#if dirstate-v2-rewrite
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$ d2args="--config devel.dirstate.v2.data_update_mode=force-new"
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#endif
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#if dirstate-v2-append
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$ d2args="--config devel.dirstate.v2.data_update_mode=force-append"
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#endif
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#if dirstate-v1
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$ cfg="devel.sync.dirstate.pre-read-file"
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#else
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#if pre-all-read
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$ cfg="devel.sync.dirstate.pre-read-file"
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#else
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$ cfg="devel.sync.dirstate.post-docket-read-file"
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#endif
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#endif
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$ directories="dir dir/nested dir2"
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$ first_files="dir/nested/a dir/b dir/c dir/d dir2/e f"
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$ second_files="g dir/nested/h dir/i dir/j dir2/k dir2/l dir/nested/m"
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$ extra_files="dir/n dir/o p q"
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$ hg init reference-repo
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$ cd reference-repo
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$ mkdir -p dir/nested dir2
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$ touch -t 200001010000 $first_files $directories
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$ hg commit -Aqm "recreate a bunch of files to facilitate dirstate-v2 append"
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$ touch -t 200001010010 $second_files $directories
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$ hg commit -Aqm "more files to have two commit"
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$ hg log -G -v
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@ changeset: 1:9a86dcbfb938
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| tag: tip
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| user: test
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| date: Thu Jan 01 00:00:00 1970 +0000
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| files: dir/i dir/j dir/nested/h dir/nested/m dir2/k dir2/l g
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| description:
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| more files to have two commit
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o changeset: 0:4f23db756b09
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user: test
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date: Thu Jan 01 00:00:00 1970 +0000
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files: dir/b dir/c dir/d dir/nested/a dir2/e f
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description:
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recreate a bunch of files to facilitate dirstate-v2 append
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$ hg manifest
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dir/b
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dir/c
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dir/d
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dir/i
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dir/j
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dir/nested/a
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dir/nested/h
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dir/nested/m
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dir2/e
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dir2/k
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dir2/l
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f
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g
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Add some unknown files and refresh the dirstate
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$ touch -t 200001010020 $extra_files
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$ hg add dir/o
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$ hg remove dir/nested/m
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$ hg st --config devel.dirstate.v2.data_update_mode=force-new
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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$ hg debugstate
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n 644 0 2000-01-01 00:00:00 dir/b
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n 644 0 2000-01-01 00:00:00 dir/c
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n 644 0 2000-01-01 00:00:00 dir/d
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n 644 0 2000-01-01 00:10:00 dir/i
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n 644 0 2000-01-01 00:10:00 dir/j
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n 644 0 2000-01-01 00:00:00 dir/nested/a
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n 644 0 2000-01-01 00:10:00 dir/nested/h
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r ?????????????????????????????????? dir/nested/m (glob)
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a ?????????????????????????????????? dir/o (glob)
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n 644 0 2000-01-01 00:00:00 dir2/e
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n 644 0 2000-01-01 00:10:00 dir2/k
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n 644 0 2000-01-01 00:10:00 dir2/l
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n 644 0 2000-01-01 00:00:00 f
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n 644 0 2000-01-01 00:10:00 g
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$ hg debugstate > ../reference
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$ cd ..
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Actual Testing
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==============
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Race with a `hg add`
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-------------------
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$ cp -a reference-repo race-with-add
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$ cd race-with-add
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spin a `hg status` with some caches to update
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$ hg st >$TESTTMP/status-race-lock.out 2>$TESTTMP/status-race-lock.log \
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> --config rhg.on-unsupported=abort \
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> --config ${cfg}=$TESTTMP/status-race-lock \
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> &
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$ $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/status-race-lock.waiting
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Add a file
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$ hg $d2args add dir/n
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$ touch $TESTTMP/status-race-lock
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$ wait
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The file should in a "added" state
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$ hg status
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A dir/n
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A dir/o
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R dir/nested/m
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? p
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? q
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The status process should return a consistent result and not crash.
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#if rust dirstate-v2-append pre-some-read
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$ cat $TESTTMP/status-race-lock.out
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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#else
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$ cat $TESTTMP/status-race-lock.out
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A dir/n
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A dir/o
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R dir/nested/m
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? p
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? q
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#endif
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$ cat $TESTTMP/status-race-lock.log
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final cleanup
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$ rm $TESTTMP/status-race-lock $TESTTMP/status-race-lock.waiting
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$ cd ..
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Race with a `hg commit`
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-----------------------
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$ cp -a reference-repo race-with-commit
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$ cd race-with-commit
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spin a `hg status with some cache to update
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$ hg st >$TESTTMP/status-race-lock.out 2>$TESTTMP/status-race-lock.log \
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> --config rhg.on-unsupported=abort \
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> --config ${cfg}=$TESTTMP/status-race-lock \
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> &
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$ $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/status-race-lock.waiting
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Add a do a commit
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$ hg status
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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$ hg $d2args commit -m 'racing commit'
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$ touch $TESTTMP/status-race-lock
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$ wait
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commit was created, and status is now clean
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$ hg log -GT '{node|short} {desc}\n'
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@ 02a67a77ee9b racing commit
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o 9a86dcbfb938 more files to have two commit
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o 4f23db756b09 recreate a bunch of files to facilitate dirstate-v2 append
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$ hg status
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? dir/n
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? p
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? q
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The status process should return a consistent result and not crash.
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#if dirstate-v1
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$ cat $TESTTMP/status-race-lock.out
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? dir/n
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? p
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? q
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#endif
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#if dirstate-v2
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$ cat $TESTTMP/status-race-lock.out
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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#endif
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final cleanup
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$ rm $TESTTMP/status-race-lock $TESTTMP/status-race-lock.waiting
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$ cd ..
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Race with a `hg update`
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-----------------------
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$ cp -a reference-repo race-with-update
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$ cd race-with-update
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spin a `hg status` with some caches to update
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$ hg st >$TESTTMP/status-race-lock.out 2>$TESTTMP/status-race-lock.log \
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> --config rhg.on-unsupported=abort \
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> --config ${cfg}=$TESTTMP/status-race-lock \
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> &
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$ $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/status-race-lock.waiting
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do an update
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$ hg status
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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$ hg log -GT '{node|short} {desc}\n'
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@ 9a86dcbfb938 more files to have two commit
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o 4f23db756b09 recreate a bunch of files to facilitate dirstate-v2 append
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$ hg $d2args update --merge ".~1"
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0 files updated, 0 files merged, 6 files removed, 0 files unresolved
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$ touch $TESTTMP/status-race-lock
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$ wait
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$ hg log -GT '{node|short} {desc}\n'
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o 9a86dcbfb938 more files to have two commit
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@ 4f23db756b09 recreate a bunch of files to facilitate dirstate-v2 append
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$ hg status
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A dir/o
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? dir/n
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? p
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? q
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The status process should return a consistent result and not crash.
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#if rust dirstate-v2-append pre-some-read
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$ cat $TESTTMP/status-race-lock.out
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A dir/o
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R dir/nested/m
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! dir/i
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! dir/j
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! dir/nested/h
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! dir2/k
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! dir2/l
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! g
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? dir/n
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? p
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? q
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#else
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$ cat $TESTTMP/status-race-lock.out
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A dir/o
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? dir/n
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? p
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? q
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#endif
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$ cat $TESTTMP/status-race-lock.log
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final cleanup
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$ rm $TESTTMP/status-race-lock $TESTTMP/status-race-lock.waiting
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$ cd ..
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Race with a cache updating `hg status`
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--------------------------------------
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It is interesting to race with "read-only" operation (that still update its cache)
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$ cp -a reference-repo race-with-status
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$ cd race-with-status
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spin a `hg status` with some caches to update
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$ hg st >$TESTTMP/status-race-lock.out 2>$TESTTMP/status-race-lock.log \
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> --config rhg.on-unsupported=abort \
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> --config ${cfg}=$TESTTMP/status-race-lock \
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> &
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$ $RUNTESTDIR/testlib/wait-on-file 5 $TESTTMP/status-race-lock.waiting
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do an update
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$ touch -t 200001020006 f
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$ hg $d2args status
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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$ touch $TESTTMP/status-race-lock
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$ wait
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The status process should return a consistent result and not crash.
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$ cat $TESTTMP/status-race-lock.out
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A dir/o
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R dir/nested/m
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? dir/n
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? p
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? q
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$ cat $TESTTMP/status-race-lock.log
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final cleanup
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$ rm $TESTTMP/status-race-lock $TESTTMP/status-race-lock.waiting
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$ cd ..
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