mirror of
https://github.com/facebook/sapling.git
synced 2024-10-07 15:27:13 +03:00
8f8cc06067
Currently, there is no way to recover from a missing or corrupt fncache file in place (a clone is required). For certain use cases such as servers and with large repositories, an in-place repair may be desirable. This patch adds functionality for in-place repair of the fncache. The `hg debugrebuildfncache` command is introduced. It ensures the fncache is up to date by reconstructing the fncache from all seen files encountered during a brute force traversal of the repository's entire history. The command will add missing entries and will prune excess ones. Currently, the command no-ops unless the repository has the fncache requirement. The command could later grow the ability to "upgrade" an existing repository to be fncache enabled, if desired. When testing this patch on a local clone of the Firefox repository, it removed a bunch of entries. Investigation revealed that removed entries belonged to empty (0 byte size) .i filelogs. The functionality for pruning fncache of stripped revlogs was introduced in 93ba76bfbe8a, so the presence of these entries likely predates this feature.
398 lines
11 KiB
Perl
398 lines
11 KiB
Perl
Init repo1:
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$ hg init repo1
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$ cd repo1
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$ echo "some text" > a
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$ hg add
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adding a
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$ hg ci -m first
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$ cat .hg/store/fncache | sort
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data/a.i
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Testing a.i/b:
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$ mkdir a.i
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$ echo "some other text" > a.i/b
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$ hg add
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adding a.i/b (glob)
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$ hg ci -m second
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$ cat .hg/store/fncache | sort
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data/a.i
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data/a.i.hg/b.i
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Testing a.i.hg/c:
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$ mkdir a.i.hg
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$ echo "yet another text" > a.i.hg/c
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$ hg add
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adding a.i.hg/c (glob)
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$ hg ci -m third
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$ cat .hg/store/fncache | sort
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data/a.i
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data/a.i.hg.hg/c.i
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data/a.i.hg/b.i
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Testing verify:
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$ hg verify
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checking changesets
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checking manifests
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crosschecking files in changesets and manifests
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checking files
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3 files, 3 changesets, 3 total revisions
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$ rm .hg/store/fncache
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$ hg verify
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checking changesets
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checking manifests
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crosschecking files in changesets and manifests
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checking files
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warning: revlog 'data/a.i' not in fncache!
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warning: revlog 'data/a.i.hg/c.i' not in fncache!
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warning: revlog 'data/a.i/b.i' not in fncache!
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3 files, 3 changesets, 3 total revisions
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3 warnings encountered!
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hint: run "hg debugrebuildfncache" to recover from corrupt fncache
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Follow the hint to make sure it works
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$ hg debugrebuildfncache
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adding data/a.i
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adding data/a.i.hg/c.i
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adding data/a.i/b.i
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3 items added, 0 removed from fncache
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$ hg verify
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checking changesets
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checking manifests
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crosschecking files in changesets and manifests
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checking files
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3 files, 3 changesets, 3 total revisions
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$ cd ..
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Non store repo:
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$ hg --config format.usestore=False init foo
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$ cd foo
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$ mkdir tst.d
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$ echo foo > tst.d/foo
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$ hg ci -Amfoo
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adding tst.d/foo
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$ find .hg | sort
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.hg
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.hg/00changelog.i
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.hg/00manifest.i
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.hg/cache
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.hg/cache/branch2-served
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.hg/cache/rbc-names-v1
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.hg/cache/rbc-revs-v1
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.hg/data
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.hg/data/tst.d.hg
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.hg/data/tst.d.hg/foo.i
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.hg/dirstate
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.hg/last-message.txt
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.hg/phaseroots
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.hg/requires
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.hg/undo
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.hg/undo.backupfiles
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.hg/undo.bookmarks
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.hg/undo.branch
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.hg/undo.desc
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.hg/undo.dirstate
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.hg/undo.phaseroots
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$ cd ..
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Non fncache repo:
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$ hg --config format.usefncache=False init bar
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$ cd bar
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$ mkdir tst.d
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$ echo foo > tst.d/Foo
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$ hg ci -Amfoo
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adding tst.d/Foo
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$ find .hg | sort
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.hg
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.hg/00changelog.i
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.hg/cache
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.hg/cache/branch2-served
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.hg/cache/rbc-names-v1
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.hg/cache/rbc-revs-v1
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.hg/dirstate
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.hg/last-message.txt
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.hg/requires
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.hg/store
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.hg/store/00changelog.i
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.hg/store/00manifest.i
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.hg/store/data
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.hg/store/data/tst.d.hg
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.hg/store/data/tst.d.hg/_foo.i
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.hg/store/phaseroots
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.hg/store/undo
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.hg/store/undo.backupfiles
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.hg/store/undo.phaseroots
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.hg/undo.bookmarks
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.hg/undo.branch
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.hg/undo.desc
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.hg/undo.dirstate
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$ cd ..
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Encoding of reserved / long paths in the store
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$ hg init r2
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$ cd r2
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$ cat <<EOF > .hg/hgrc
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> [ui]
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> portablefilenames = ignore
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> EOF
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$ hg import -q --bypass - <<EOF
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> # HG changeset patch
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> # User test
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> # Date 0 0
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> # Node ID 1c7a2f7cb77be1a0def34e4c7cabc562ad98fbd7
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> # Parent 0000000000000000000000000000000000000000
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> 1
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>
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> diff --git a/12345678/12345678/12345678/12345678/12345678/12345678/12345678/12345/xxxxxxxxx-xxxxxxxxx-xxxxxxxxx-123456789-12.3456789-12345-ABCDEFGHIJKLMNOPRSTUVWXYZ-abcdefghjiklmnopqrstuvwxyz b/12345678/12345678/12345678/12345678/12345678/12345678/12345678/12345/xxxxxxxxx-xxxxxxxxx-xxxxxxxxx-123456789-12.3456789-12345-ABCDEFGHIJKLMNOPRSTUVWXYZ-abcdefghjiklmnopqrstuvwxyz
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> new file mode 100644
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> --- /dev/null
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> +++ b/12345678/12345678/12345678/12345678/12345678/12345678/12345678/12345/xxxxxxxxx-xxxxxxxxx-xxxxxxxxx-123456789-12.3456789-12345-ABCDEFGHIJKLMNOPRSTUVWXYZ-abcdefghjiklmnopqrstuvwxyz
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> @@ -0,0 +1,1 @@
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> +foo
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> diff --git a/AUX/SECOND/X.PRN/FOURTH/FI:FTH/SIXTH/SEVENTH/EIGHTH/NINETH/TENTH/ELEVENTH/LOREMIPSUM.TXT b/AUX/SECOND/X.PRN/FOURTH/FI:FTH/SIXTH/SEVENTH/EIGHTH/NINETH/TENTH/ELEVENTH/LOREMIPSUM.TXT
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> new file mode 100644
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> --- /dev/null
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> +++ b/AUX/SECOND/X.PRN/FOURTH/FI:FTH/SIXTH/SEVENTH/EIGHTH/NINETH/TENTH/ELEVENTH/LOREMIPSUM.TXT
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> @@ -0,0 +1,1 @@
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> +foo
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> diff --git a/Project Planning/Resources/AnotherLongDirectoryName/Followedbyanother/AndAnother/AndThenAnExtremelyLongFileName.txt b/Project Planning/Resources/AnotherLongDirectoryName/Followedbyanother/AndAnother/AndThenAnExtremelyLongFileName.txt
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> new file mode 100644
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> --- /dev/null
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> +++ b/Project Planning/Resources/AnotherLongDirectoryName/Followedbyanother/AndAnother/AndThenAnExtremelyLongFileName.txt
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> @@ -0,0 +1,1 @@
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> +foo
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> diff --git a/bla.aux/prn/PRN/lpt/com3/nul/coma/foo.NUL/normal.c b/bla.aux/prn/PRN/lpt/com3/nul/coma/foo.NUL/normal.c
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> new file mode 100644
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> --- /dev/null
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> +++ b/bla.aux/prn/PRN/lpt/com3/nul/coma/foo.NUL/normal.c
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> @@ -0,0 +1,1 @@
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> +foo
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> diff --git a/enterprise/openesbaddons/contrib-imola/corba-bc/netbeansplugin/wsdlExtension/src/main/java/META-INF/services/org.netbeans.modules.xml.wsdl.bindingsupport.spi.ExtensibilityElementTemplateProvider b/enterprise/openesbaddons/contrib-imola/corba-bc/netbeansplugin/wsdlExtension/src/main/java/META-INF/services/org.netbeans.modules.xml.wsdl.bindingsupport.spi.ExtensibilityElementTemplateProvider
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> new file mode 100644
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> --- /dev/null
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> +++ b/enterprise/openesbaddons/contrib-imola/corba-bc/netbeansplugin/wsdlExtension/src/main/java/META-INF/services/org.netbeans.modules.xml.wsdl.bindingsupport.spi.ExtensibilityElementTemplateProvider
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> @@ -0,0 +1,1 @@
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> +foo
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> EOF
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$ find .hg/store -name *.i | sort
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.hg/store/00changelog.i
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.hg/store/00manifest.i
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.hg/store/data/bla.aux/pr~6e/_p_r_n/lpt/co~6d3/nu~6c/coma/foo._n_u_l/normal.c.i
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.hg/store/dh/12345678/12345678/12345678/12345678/12345678/12345678/12345678/12345/xxxxxx168e07b38e65eff86ab579afaaa8e30bfbe0f35f.i
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.hg/store/dh/au~78/second/x.prn/fourth/fi~3afth/sixth/seventh/eighth/nineth/tenth/loremia20419e358ddff1bf8751e38288aff1d7c32ec05.i
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.hg/store/dh/enterpri/openesba/contrib-/corba-bc/netbeans/wsdlexte/src/main/java/org.net7018f27961fdf338a598a40c4683429e7ffb9743.i
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.hg/store/dh/project_/resource/anotherl/followed/andanoth/andthenanextremelylongfilename0d8e1f4187c650e2f1fdca9fd90f786bc0976b6b.i
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$ cd ..
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Aborting lock does not prevent fncache writes
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$ cat > exceptionext.py <<EOF
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> import os
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> from mercurial import commands, util
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> from mercurial.extensions import wrapfunction
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>
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> def lockexception(orig, vfs, lockname, wait, releasefn, acquirefn, desc):
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> def releasewrap():
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> raise util.Abort("forced lock failure")
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> return orig(vfs, lockname, wait, releasewrap, acquirefn, desc)
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>
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> def reposetup(ui, repo):
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> wrapfunction(repo, '_lock', lockexception)
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>
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> cmdtable = {}
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>
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> EOF
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$ extpath=`pwd`/exceptionext.py
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$ hg init fncachetxn
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$ cd fncachetxn
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$ printf "[extensions]\nexceptionext=$extpath\n" >> .hg/hgrc
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$ touch y
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$ hg ci -qAm y
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abort: forced lock failure
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[255]
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$ cat .hg/store/fncache
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data/y.i
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Aborting transaction prevents fncache change
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$ cat > ../exceptionext.py <<EOF
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> import os
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> from mercurial import commands, util, localrepo
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> from mercurial.extensions import wrapfunction
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>
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> def wrapper(orig, self, *args, **kwargs):
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> tr = orig(self, *args, **kwargs)
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> def fail(tr):
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> raise util.Abort("forced transaction failure")
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> # zzz prefix to ensure it sorted after store.write
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> tr.addfinalize('zzz-forcefails', fail)
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> return tr
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>
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> def uisetup(ui):
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> wrapfunction(localrepo.localrepository, 'transaction', wrapper)
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>
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> cmdtable = {}
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>
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> EOF
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$ rm -f "${extpath}c"
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$ touch z
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$ hg ci -qAm z
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transaction abort!
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rollback completed
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abort: forced transaction failure
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[255]
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$ cat .hg/store/fncache
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data/y.i
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Aborted transactions can be recovered later
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$ cat > ../exceptionext.py <<EOF
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> import os
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> from mercurial import commands, util, transaction, localrepo
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> from mercurial.extensions import wrapfunction
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>
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> def trwrapper(orig, self, *args, **kwargs):
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> tr = orig(self, *args, **kwargs)
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> def fail(tr):
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> raise util.Abort("forced transaction failure")
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> # zzz prefix to ensure it sorted after store.write
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> tr.addfinalize('zzz-forcefails', fail)
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> return tr
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>
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> def abortwrapper(orig, self, *args, **kwargs):
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> raise util.Abort("forced transaction failure")
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>
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> def uisetup(ui):
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> wrapfunction(localrepo.localrepository, 'transaction', trwrapper)
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> wrapfunction(transaction.transaction, '_abort', abortwrapper)
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>
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> cmdtable = {}
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>
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> EOF
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$ rm -f "${extpath}c"
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$ hg up -q 1
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$ touch z
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$ hg ci -qAm z 2>/dev/null
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[255]
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$ cat .hg/store/fncache | sort
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data/y.i
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data/z.i
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$ hg recover
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rolling back interrupted transaction
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checking changesets
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checking manifests
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crosschecking files in changesets and manifests
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checking files
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1 files, 1 changesets, 1 total revisions
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$ cat .hg/store/fncache
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data/y.i
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$ cd ..
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debugrebuildfncache does nothing unless repo has fncache requirement
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$ hg --config format.usefncache=false init nofncache
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$ cd nofncache
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$ hg debugrebuildfncache
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(not rebuilding fncache because repository does not support fncache
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$ cd ..
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debugrebuildfncache works on empty repository
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$ hg init empty
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$ cd empty
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$ hg debugrebuildfncache
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fncache already up to date
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$ cd ..
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debugrebuildfncache on an up to date repository no-ops
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$ hg init repo
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$ cd repo
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$ echo initial > foo
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$ echo initial > .bar
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$ hg commit -A -m initial
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adding .bar
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adding foo
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$ cat .hg/store/fncache | sort
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data/.bar.i
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data/foo.i
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$ hg debugrebuildfncache
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fncache already up to date
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debugrebuildfncache restores deleted fncache file
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$ rm -f .hg/store/fncache
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$ hg debugrebuildfncache
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adding data/.bar.i
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adding data/foo.i
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2 items added, 0 removed from fncache
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$ cat .hg/store/fncache | sort
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data/.bar.i
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data/foo.i
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Rebuild after rebuild should no-op
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$ hg debugrebuildfncache
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fncache already up to date
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A single missing file should get restored, an extra file should be removed
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$ cat > .hg/store/fncache << EOF
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> data/foo.i
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> data/bad-entry.i
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> EOF
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$ hg debugrebuildfncache
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removing data/bad-entry.i
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adding data/.bar.i
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1 items added, 1 removed from fncache
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$ cat .hg/store/fncache | sort
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data/.bar.i
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data/foo.i
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$ cd ..
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Try a simple variation without dotencode to ensure fncache is ignorant of encoding
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$ hg --config format.dotencode=false init nodotencode
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$ cd nodotencode
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$ echo initial > foo
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$ echo initial > .bar
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$ hg commit -A -m initial
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adding .bar
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adding foo
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$ cat .hg/store/fncache | sort
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data/.bar.i
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data/foo.i
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$ rm .hg/store/fncache
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$ hg debugrebuildfncache
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adding data/.bar.i
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adding data/foo.i
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2 items added, 0 removed from fncache
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$ cat .hg/store/fncache | sort
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data/.bar.i
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data/foo.i
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