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Test transaction safety
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=======================
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#testcases revlogv1 revlogv2 changelogv2
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#if revlogv1
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$ cat << EOF >> $HGRCPATH
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> [experimental]
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> revlogv2=no
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> EOF
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#endif
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#if revlogv2
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$ cat << EOF >> $HGRCPATH
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> [experimental]
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> revlogv2=enable-unstable-format-and-corrupt-my-data
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> EOF
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#endif
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#if changelogv2
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$ cat << EOF >> $HGRCPATH
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> [format]
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> exp-use-changelog-v2=enable-unstable-format-and-corrupt-my-data
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> EOF
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#endif
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This test basic case to make sure external process do not see transaction
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content until it is committed.
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# TODO: also add an external reader accessing revlog files while they are written
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# (instead of during transaction finalisation)
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# TODO: also add stream clone and hardlink clone happening during these transaction.
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setup
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-----
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synchronisation+output script using the following schedule:
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[A1] "external" is started
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[A2] "external" waits on EXT_UNLOCK
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[A2] "external" + creates EXT_WAITING → unlocks [C1]
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[B1] "hg commit/pull" is started
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[B2] "hg commit/pull" is ready to be committed
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[B3] "hg commit/pull" spawn "internal" using a pretxnclose hook (need [C4])
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[C1] "internal" waits on EXT_WAITING (need [A2])
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[C2] "internal" creates EXT_UNLOCK → unlocks [A2]
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[C3] "internal" show the tipmost revision (inside of the transaction)
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[C4] "internal" waits on EXT_DONE (need [A4])
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[A3] "external" show the tipmost revision (outside of the transaction)
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[A4] "external" creates EXT_DONE → unlocks [C4]
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[C5] "internal" end of execution -> unlock [B3]
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[B4] "hg commit/pull" transaction is committed on disk
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$ mkdir sync
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$ mkdir output
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$ mkdir script
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$ HG_TEST_FILE_EXT_WAITING=$TESTTMP/sync/ext_waiting
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$ export HG_TEST_FILE_EXT_WAITING
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$ HG_TEST_FILE_EXT_UNLOCK=$TESTTMP/sync/ext_unlock
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$ export HG_TEST_FILE_EXT_UNLOCK
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$ HG_TEST_FILE_EXT_DONE=$TESTTMP/sync/ext_done
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$ export HG_TEST_FILE_EXT_DONE
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$ cat << EOF > script/external.sh
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> #!/bin/sh
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> "$RUNTESTDIR/testlib/wait-on-file" 5 "$HG_TEST_FILE_EXT_UNLOCK" "$HG_TEST_FILE_EXT_WAITING"
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> hg log --rev 'tip' -T 'external: {rev} {desc}\n' > "$TESTTMP/output/external.out"
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> touch "$HG_TEST_FILE_EXT_DONE"
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> EOF
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$ cat << EOF > script/internal.sh
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> #!/bin/sh
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> "$RUNTESTDIR/testlib/wait-on-file" 5 "$HG_TEST_FILE_EXT_WAITING"
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> touch "$HG_TEST_FILE_EXT_UNLOCK"
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> hg log --rev 'tip' -T 'internal: {rev} {desc}\n' > "$TESTTMP/output/internal.out"
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> "$RUNTESTDIR/testlib/wait-on-file" 5 "$HG_TEST_FILE_EXT_DONE"
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> EOF
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Automated commands:
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$ make_one_commit() {
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> rm -f $TESTTMP/sync/*
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> rm -f $TESTTMP/output/*
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> hg log --rev 'tip' -T 'pre-commit: {rev} {desc}\n'
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> echo x >> a
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> sh $TESTTMP/script/external.sh & hg commit -m "$1"
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> cat $TESTTMP/output/external.out
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> cat $TESTTMP/output/internal.out
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> hg log --rev 'tip' -T 'post-tr: {rev} {desc}\n'
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> }
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$ make_one_pull() {
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> rm -f $TESTTMP/sync/*
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> rm -f $TESTTMP/output/*
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> hg log --rev 'tip' -T 'pre-commit: {rev} {desc}\n'
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> echo x >> a
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> sh $TESTTMP/script/external.sh & hg pull ../other-repo/ --rev "$1" --force --quiet
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> cat $TESTTMP/output/external.out
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> cat $TESTTMP/output/internal.out
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> hg log --rev 'tip' -T 'post-tr: {rev} {desc}\n'
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> }
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prepare a large source to which to pull from:
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The source is large to unsure we don't use inline more after the pull
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$ hg init other-repo
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$ hg -R other-repo debugbuilddag .+500
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prepare an empty repository where to make test:
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$ hg init repo
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$ cd repo
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$ touch a
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$ hg add a
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prepare a small extension to controll inline size
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$ mkdir $TESTTMP/ext
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$ cat << EOF > $TESTTMP/ext/small_inline.py
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> from mercurial import revlog
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> revlog._maxinline = 64 * 100
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> EOF
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$ cat << EOF >> $HGRCPATH
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> [extensions]
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> small_inline=$TESTTMP/ext/small_inline.py
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> [hooks]
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> pretxnclose = sh $TESTTMP/script/internal.sh
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> EOF
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check this is true for the initial commit (inline → inline)
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-----------------------------------------------------------
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the repository should still be inline (for relevant format)
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$ make_one_commit first
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pre-commit: -1
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external: -1
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internal: 0 first
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post-tr: 0 first
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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check this is true for extra commit (inline → inline)
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-----------------------------------------------------
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the repository should still be inline (for relevant format)
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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$ make_one_commit second
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pre-commit: 0 first
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external: 0 first
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internal: 1 second
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post-tr: 1 second
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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check this is true for a small pull (inline → inline)
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-----------------------------------------------------
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the repository should still be inline (for relevant format)
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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$ make_one_pull 3
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pre-commit: 1 second
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warning: repository is unrelated
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external: 1 second
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internal: 5 r3
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post-tr: 5 r3
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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Make a large pull (inline → no-inline)
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---------------------------------------
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the repository should no longer be inline (for relevant format)
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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flags : inline
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#endif
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$ make_one_pull 400
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pre-commit: 5 r3
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external: 5 r3
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internal: 402 r400
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post-tr: 402 r400
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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[1]
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#endif
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check this is true for extra commit (no-inline → no-inline)
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-----------------------------------------------------------
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the repository should no longer be inline (for relevant format)
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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[1]
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#endif
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$ make_one_commit third
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pre-commit: 402 r400
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external: 402 r400
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internal: 403 third
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post-tr: 403 third
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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[1]
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#endif
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Make a pull (not-inline → no-inline)
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-------------------------------------
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the repository should no longer be inline (for relevant format)
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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[1]
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#endif
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$ make_one_pull tip
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pre-commit: 403 third
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external: 403 third
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internal: 503 r500
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post-tr: 503 r500
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#if revlogv1
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$ hg debugrevlog -c | grep inline
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[1]
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#endif
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