view tests/test-clonebundles.t @ 40326:fed697fa1734

sqlitestore: file storage backend using SQLite

This commit provides an extension which uses SQLite to store file
data (as opposed to revlogs).

As the inline documentation describes, there are still several
aspects to the extension that are incomplete. But it's a start.
The extension does support basic clone, checkout, and commit
workflows, which makes it suitable for simple use cases.

One notable missing feature is support for "bundlerepos." This is
probably responsible for the most test failures when the extension
is activated as part of the test suite.

All revision data is stored in SQLite. Data is stored as zstd
compressed chunks (default if zstd is available), zlib compressed
chunks (default if zstd is not available), or raw chunks (if
configured or if a compressed delta is not smaller than the raw
delta). This makes things very similar to revlogs.

Unlike revlogs, the extension doesn't yet enforce a limit on delta
chain length. This is an obvious limitation and should be addressed.
This is somewhat mitigated by the use of zstd, which is much faster
than zlib to decompress.

There is a dedicated table for storing deltas. Deltas are stored
by the SHA-1 hash of their uncompressed content. The "fileindex" table
has columns that reference the delta for each revision and the base
delta that delta should be applied against. A recursive SQL query
is used to resolve the delta chain along with the delta data.

By storing deltas by hash, we are able to de-duplicate delta storage!
With revlogs, the same deltas in different revlogs would result in
duplicate storage of that delta. In this scheme, inserting the
duplicate delta is a no-op and delta chains simply reference the
existing delta.

When initially implementing this extension, I did not have
content-indexed deltas and deltas could be duplicated across files
(just like revlogs). When I implemented content-indexed deltas, the
size of the SQLite database for a full clone of mozilla-unified
dropped:

before: 2,554,261,504 bytes
after:  2,488,754,176 bytes

Surprisingly, this is still larger than the bytes size of revlog
files:

revlog files: 2,104,861,230 bytes
du -b:        2,254,381,614

I would have expected storage to be smaller since we're not limiting
delta chain length and since we're using zstd instead of zlib. I
suspect the SQLite indexes and per-column overhead account for the
bulk of the differences. (Keep in mind that revlog uses a 64-byte
packed struct for revision index data and deltas are stored without
padding. Aside from the 12 unused bytes in the 32 byte node field,
revlogs are pretty efficient.) Another source of overhead is file
name storage. With revlogs, file names are stored in the filesystem.
But with SQLite, we need to store file names in the database. This is
roughly equivalent to the size of the fncache file, which for the
mozilla-unified repository is ~34MB.

Since the SQLite database isn't append-only and since delta chains
can reference any delta, this opens some interesting possibilities.
For example, we could store deltas in reverse, such that fulltexts
are stored for newer revisions and deltas are applied to reconstruct
older revisions. This is likely a more optimal storage strategy for
version control, as new data tends to be more frequently accessed
than old data. We would obviously need wire protocol support for
transferring revision data from newest to oldest. And we would
probably need some kind of mechanism for "re-encoding" stores. But
it should be doable.

This extension is very much experimental quality. There are a handful
of features that don't work. It probably isn't suitable for day-to-day
use. But it could be used in limited cases (e.g. read-only checkouts
like in CI). And it is also a good proving ground for alternate
storage backends. As we continue to define interfaces for all things
storage, it will be useful to have a viable alternate storage backend
to see how things shake out in practice.

test-storage.py passes on Python 2 and introduces no new test failures on
Python 3. Having the storage-level unit tests has proved to be insanely
useful when developing this extension. Those tests caught numerous bugs
during development and I'm convinced this style of testing is the way
forward for ensuring alternate storage backends work as intended. Of
course, test coverage isn't close to what it needs to be. But it is
a start. And what coverage we have gives me confidence that basic store
functionality is implemented properly.

Differential Revision: https://phab.mercurial-scm.org/D4928

#require no-reposimplestore no-chg

Set up a server

  $ hg init server
  $ cd server
  $ cat >> .hg/hgrc << EOF
  > [extensions]
  > clonebundles =
  > EOF

  $ touch foo
  $ hg -q commit -A -m 'add foo'
  $ touch bar
  $ hg -q commit -A -m 'add bar'

  $ hg serve -d -p $HGPORT --pid-file hg.pid --accesslog access.log
  $ cat hg.pid >> $DAEMON_PIDS
  $ cd ..

Missing manifest should not result in server lookup

  $ hg --verbose clone -U http://localhost:$HGPORT no-manifest
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 53245c60e682:aaff8d2ffbbf
  (sent 3 HTTP requests and * bytes; received * bytes in responses) (glob)

  $ cat server/access.log
  * - - [*] "GET /?cmd=capabilities HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /?cmd=batch HTTP/1.1" 200 - x-hgarg-1:cmds=heads+%3Bknown+nodes%3D x-hgproto-1:0.1 0.2 comp=$USUAL_COMPRESSIONS$ partial-pull (glob)
  $LOCALIP - - [$LOGDATE$] "GET /?cmd=getbundle HTTP/1.1" 200 - x-hgarg-1:bookmarks=1&$USUAL_BUNDLE_CAPS$&cg=1&common=0000000000000000000000000000000000000000&heads=aaff8d2ffbbf07a46dd1f05d8ae7877e3f56e2a2&listkeys=bookmarks&phases=1 x-hgproto-1:0.1 0.2 comp=$USUAL_COMPRESSIONS$ partial-pull (glob)

Empty manifest file results in retrieval
(the extension only checks if the manifest file exists)

  $ touch server/.hg/clonebundles.manifest
  $ hg --verbose clone -U http://localhost:$HGPORT empty-manifest
  no clone bundles available on remote; falling back to regular clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 53245c60e682:aaff8d2ffbbf
  (sent 4 HTTP requests and * bytes; received * bytes in responses) (glob)

Manifest file with invalid URL aborts

  $ echo 'http://does.not.exist/bundle.hg' > server/.hg/clonebundles.manifest
  $ hg clone http://localhost:$HGPORT 404-url
  applying clone bundle from http://does.not.exist/bundle.hg
  error fetching bundle: (.* not known|(\[Errno -?\d+])? No address associated with hostname) (re) (no-windows !)
  error fetching bundle: [Errno 11004] getaddrinfo failed (windows !)
  abort: error applying bundle
  (if this error persists, consider contacting the server operator or disable clone bundles via "--config ui.clonebundles=false")
  [255]

Server is not running aborts

  $ echo "http://localhost:$HGPORT1/bundle.hg" > server/.hg/clonebundles.manifest
  $ hg clone http://localhost:$HGPORT server-not-runner
  applying clone bundle from http://localhost:$HGPORT1/bundle.hg
  error fetching bundle: (.* refused.*|Protocol not supported|(.* )?Cannot assign requested address) (re)
  abort: error applying bundle
  (if this error persists, consider contacting the server operator or disable clone bundles via "--config ui.clonebundles=false")
  [255]

Server returns 404

  $ "$PYTHON" $TESTDIR/dumbhttp.py -p $HGPORT1 --pid http.pid
  $ cat http.pid >> $DAEMON_PIDS
  $ hg clone http://localhost:$HGPORT running-404
  applying clone bundle from http://localhost:$HGPORT1/bundle.hg
  HTTP error fetching bundle: HTTP Error 404: File not found
  abort: error applying bundle
  (if this error persists, consider contacting the server operator or disable clone bundles via "--config ui.clonebundles=false")
  [255]

We can override failure to fall back to regular clone

  $ hg --config ui.clonebundlefallback=true clone -U http://localhost:$HGPORT 404-fallback
  applying clone bundle from http://localhost:$HGPORT1/bundle.hg
  HTTP error fetching bundle: HTTP Error 404: File not found
  falling back to normal clone
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 53245c60e682:aaff8d2ffbbf

Bundle with partial content works

  $ hg -R server bundle --type gzip-v1 --base null -r 53245c60e682 partial.hg
  1 changesets found

We verify exact bundle content as an extra check against accidental future
changes. If this output changes, we could break old clients.

  $ f --size --hexdump partial.hg
  partial.hg: size=207
  0000: 48 47 31 30 47 5a 78 9c 63 60 60 98 17 ac 12 93 |HG10GZx.c``.....|
  0010: f0 ac a9 23 45 70 cb bf 0d 5f 59 4e 4a 7f 79 21 |...#Ep..._YNJ.y!|
  0020: 9b cc 40 24 20 a0 d7 ce 2c d1 38 25 cd 24 25 d5 |..@$ ...,.8%.$%.|
  0030: d8 c2 22 cd 38 d9 24 cd 22 d5 c8 22 cd 24 cd 32 |..".8.$."..".$.2|
  0040: d1 c2 d0 c4 c8 d2 32 d1 38 39 29 c9 34 cd d4 80 |......2.89).4...|
  0050: ab 24 b5 b8 84 cb 40 c1 80 2b 2d 3f 9f 8b 2b 31 |.$....@..+-?..+1|
  0060: 25 45 01 c8 80 9a d2 9b 65 fb e5 9e 45 bf 8d 7f |%E......e...E...|
  0070: 9f c6 97 9f 2b 44 34 67 d9 ec 8e 0f a0 92 0b 75 |....+D4g.......u|
  0080: 41 d6 24 59 18 a4 a4 9a a6 18 1a 5b 98 9b 5a 98 |A.$Y.......[..Z.|
  0090: 9a 18 26 9b a6 19 98 1a 99 99 26 a6 18 9a 98 24 |..&.......&....$|
  00a0: 26 59 a6 25 5a 98 a5 18 a6 24 71 41 35 b1 43 dc |&Y.%Z....$qA5.C.|
  00b0: 16 b2 83 f7 e9 45 8b d2 56 c7 a3 1f 82 52 d7 8a |.....E..V....R..|
  00c0: 78 ed fc d5 76 f1 36 35 dc 05 00 36 ed 5e c7    |x...v.65...6.^.|

  $ echo "http://localhost:$HGPORT1/partial.hg" > server/.hg/clonebundles.manifest
  $ hg clone -U http://localhost:$HGPORT partial-bundle
  applying clone bundle from http://localhost:$HGPORT1/partial.hg
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  finished applying clone bundle
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets aaff8d2ffbbf
  1 local changesets published

Incremental pull doesn't fetch bundle

  $ hg clone -r 53245c60e682 -U http://localhost:$HGPORT partial-clone
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets 53245c60e682

  $ cd partial-clone
  $ hg pull
  pulling from http://localhost:$HGPORT/
  searching for changes
  adding changesets
  adding manifests
  adding file changes
  added 1 changesets with 1 changes to 1 files
  new changesets aaff8d2ffbbf
  (run 'hg update' to get a working copy)
  $ cd ..

Bundle with full content works

  $ hg -R server bundle --type gzip-v2 --base null -r tip full.hg
  2 changesets found

Again, we perform an extra check against bundle content changes. If this content
changes, clone bundles produced by new Mercurial versions may not be readable
by old clients.

  $ f --size --hexdump full.hg
  full.hg: size=442
  0000: 48 47 32 30 00 00 00 0e 43 6f 6d 70 72 65 73 73 |HG20....Compress|
  0010: 69 6f 6e 3d 47 5a 78 9c 63 60 60 d0 e4 76 f6 70 |ion=GZx.c``..v.p|
  0020: f4 73 77 75 0f f2 0f 0d 60 00 02 46 46 76 26 4e |.swu....`..FFv&N|
  0030: c6 b2 d4 a2 e2 cc fc 3c 03 a3 bc a4 e4 8c c4 bc |.......<........|
  0040: f4 d4 62 23 06 06 e6 19 40 f9 4d c1 2a 31 09 cf |..b#....@.M.*1..|
  0050: 9a 3a 52 04 b7 fc db f0 95 e5 a4 f4 97 17 b2 c9 |.:R.............|
  0060: 0c 14 00 02 e6 d9 99 25 1a a7 a4 99 a4 a4 1a 5b |.......%.......[|
  0070: 58 a4 19 27 9b a4 59 a4 1a 59 a4 99 a4 59 26 5a |X..'..Y..Y...Y&Z|
  0080: 18 9a 18 59 5a 26 1a 27 27 25 99 a6 99 1a 70 95 |...YZ&.''%....p.|
  0090: a4 16 97 70 19 28 18 70 a5 e5 e7 73 71 25 a6 a4 |...p.(.p...sq%..|
  00a0: 28 00 19 20 17 af fa df ab ff 7b 3f fb 92 dc 8b |(.. ......{?....|
  00b0: 1f 62 bb 9e b7 d7 d9 87 3d 5a 44 89 2f b0 99 87 |.b......=ZD./...|
  00c0: ec e2 54 63 43 e3 b4 64 43 73 23 33 43 53 0b 63 |..TcC..dCs#3CS.c|
  00d0: d3 14 23 03 a0 fb 2c 2c 0c d3 80 1e 30 49 49 b1 |..#...,,....0II.|
  00e0: 4c 4a 32 48 33 30 b0 34 42 b8 38 29 b1 08 e2 62 |LJ2H30.4B.8)...b|
  00f0: 20 03 6a ca c2 2c db 2f f7 2c fa 6d fc fb 34 be | .j..,./.,.m..4.|
  0100: fc 5c 21 a2 39 cb 66 77 7c 00 0d c3 59 17 14 58 |.\!.9.fw|...Y..X|
  0110: 49 16 06 29 a9 a6 29 86 c6 16 e6 a6 16 a6 26 86 |I..)..).......&.|
  0120: c9 a6 69 06 a6 46 66 a6 89 29 86 26 26 89 49 96 |..i..Ff..).&&.I.|
  0130: 69 89 16 66 29 86 29 49 5c 20 07 3e 16 fe 23 ae |i..f).)I\ .>..#.|
  0140: 26 da 1c ab 10 1f d1 f8 e3 b3 ef cd dd fc 0c 93 |&...............|
  0150: 88 75 34 36 75 04 82 55 17 14 36 a4 38 10 04 d8 |.u46u..U..6.8...|
  0160: 21 01 9a b1 83 f7 e9 45 8b d2 56 c7 a3 1f 82 52 |!......E..V....R|
  0170: d7 8a 78 ed fc d5 76 f1 36 25 81 89 c7 ad ec 90 |..x...v.6%......|
  0180: 54 47 75 2b 89 48 b1 b2 62 c9 89 c9 19 a9 56 45 |TGu+.H..b.....VE|
  0190: a9 65 ba 49 45 89 79 c9 19 ba 60 01 a0 14 23 58 |.e.IE.y...`...#X|
  01a0: 81 35 c8 7d 40 cc 04 e2 a4 a4 a6 25 96 e6 94 60 |.5.}@......%...`|
  01b0: 33 17 5f 54 00 00 d3 1b 0d 4c                   |3._T.....L|

  $ echo "http://localhost:$HGPORT1/full.hg" > server/.hg/clonebundles.manifest
  $ hg clone -U http://localhost:$HGPORT full-bundle
  applying clone bundle from http://localhost:$HGPORT1/full.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Feature works over SSH

  $ hg clone -U -e "\"$PYTHON\" \"$TESTDIR/dummyssh\"" ssh://user@dummy/server ssh-full-clone
  applying clone bundle from http://localhost:$HGPORT1/full.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Entry with unknown BUNDLESPEC is filtered and not used

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://bad.entry1 BUNDLESPEC=UNKNOWN
  > http://bad.entry2 BUNDLESPEC=xz-v1
  > http://bad.entry3 BUNDLESPEC=none-v100
  > http://localhost:$HGPORT1/full.hg BUNDLESPEC=gzip-v2
  > EOF

  $ hg clone -U http://localhost:$HGPORT filter-unknown-type
  applying clone bundle from http://localhost:$HGPORT1/full.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Automatic fallback when all entries are filtered

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://bad.entry BUNDLESPEC=UNKNOWN
  > EOF

  $ hg clone -U http://localhost:$HGPORT filter-all
  no compatible clone bundles available on server; falling back to regular clone
  (you may want to report this to the server operator)
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 53245c60e682:aaff8d2ffbbf

URLs requiring SNI are filtered in Python <2.7.9

  $ cp full.hg sni.hg
  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/sni.hg REQUIRESNI=true
  > http://localhost:$HGPORT1/full.hg
  > EOF

#if sslcontext
Python 2.7.9+ support SNI

  $ hg clone -U http://localhost:$HGPORT sni-supported
  applying clone bundle from http://localhost:$HGPORT1/sni.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published
#else
Python <2.7.9 will filter SNI URLs

  $ hg clone -U http://localhost:$HGPORT sni-unsupported
  applying clone bundle from http://localhost:$HGPORT1/full.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published
#endif

Stream clone bundles are supported

  $ hg -R server debugcreatestreamclonebundle packed.hg
  writing 613 bytes for 4 files
  bundle requirements: generaldelta, revlogv1

No bundle spec should work

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/packed.hg
  > EOF

  $ hg clone -U http://localhost:$HGPORT stream-clone-no-spec
  applying clone bundle from http://localhost:$HGPORT1/packed.hg
  4 files to transfer, 613 bytes of data
  transferred 613 bytes in *.* seconds (*) (glob)
  finished applying clone bundle
  searching for changes
  no changes found

Bundle spec without parameters should work

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1
  > EOF

  $ hg clone -U http://localhost:$HGPORT stream-clone-vanilla-spec
  applying clone bundle from http://localhost:$HGPORT1/packed.hg
  4 files to transfer, 613 bytes of data
  transferred 613 bytes in *.* seconds (*) (glob)
  finished applying clone bundle
  searching for changes
  no changes found

Bundle spec with format requirements should work

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1;requirements%3Drevlogv1
  > EOF

  $ hg clone -U http://localhost:$HGPORT stream-clone-supported-requirements
  applying clone bundle from http://localhost:$HGPORT1/packed.hg
  4 files to transfer, 613 bytes of data
  transferred 613 bytes in *.* seconds (*) (glob)
  finished applying clone bundle
  searching for changes
  no changes found

Stream bundle spec with unknown requirements should be filtered out

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1;requirements%3Drevlogv42
  > EOF

  $ hg clone -U http://localhost:$HGPORT stream-clone-unsupported-requirements
  no compatible clone bundles available on server; falling back to regular clone
  (you may want to report this to the server operator)
  requesting all changes
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  new changesets 53245c60e682:aaff8d2ffbbf

Set up manifest for testing preferences
(Remember, the TYPE does not have to match reality - the URL is
important)

  $ cp full.hg gz-a.hg
  $ cp full.hg gz-b.hg
  $ cp full.hg bz2-a.hg
  $ cp full.hg bz2-b.hg
  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2 extra=a
  > http://localhost:$HGPORT1/bz2-a.hg BUNDLESPEC=bzip2-v2 extra=a
  > http://localhost:$HGPORT1/gz-b.hg BUNDLESPEC=gzip-v2 extra=b
  > http://localhost:$HGPORT1/bz2-b.hg BUNDLESPEC=bzip2-v2 extra=b
  > EOF

Preferring an undefined attribute will take first entry

  $ hg --config ui.clonebundleprefers=foo=bar clone -U http://localhost:$HGPORT prefer-foo
  applying clone bundle from http://localhost:$HGPORT1/gz-a.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Preferring bz2 type will download first entry of that type

  $ hg --config ui.clonebundleprefers=COMPRESSION=bzip2 clone -U http://localhost:$HGPORT prefer-bz
  applying clone bundle from http://localhost:$HGPORT1/bz2-a.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Preferring multiple values of an option works

  $ hg --config ui.clonebundleprefers=COMPRESSION=unknown,COMPRESSION=bzip2 clone -U http://localhost:$HGPORT prefer-multiple-bz
  applying clone bundle from http://localhost:$HGPORT1/bz2-a.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Sorting multiple values should get us back to original first entry

  $ hg --config ui.clonebundleprefers=BUNDLESPEC=unknown,BUNDLESPEC=gzip-v2,BUNDLESPEC=bzip2-v2 clone -U http://localhost:$HGPORT prefer-multiple-gz
  applying clone bundle from http://localhost:$HGPORT1/gz-a.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Preferring multiple attributes has correct order

  $ hg --config ui.clonebundleprefers=extra=b,BUNDLESPEC=bzip2-v2 clone -U http://localhost:$HGPORT prefer-separate-attributes
  applying clone bundle from http://localhost:$HGPORT1/bz2-b.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Test where attribute is missing from some entries

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2
  > http://localhost:$HGPORT1/bz2-a.hg BUNDLESPEC=bzip2-v2
  > http://localhost:$HGPORT1/gz-b.hg BUNDLESPEC=gzip-v2 extra=b
  > http://localhost:$HGPORT1/bz2-b.hg BUNDLESPEC=bzip2-v2 extra=b
  > EOF

  $ hg --config ui.clonebundleprefers=extra=b clone -U http://localhost:$HGPORT prefer-partially-defined-attribute
  applying clone bundle from http://localhost:$HGPORT1/gz-b.hg
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published

Test interaction between clone bundles and --stream

A manifest with just a gzip bundle

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2
  > EOF

  $ hg clone -U --stream http://localhost:$HGPORT uncompressed-gzip
  no compatible clone bundles available on server; falling back to regular clone
  (you may want to report this to the server operator)
  streaming all changes
  9 files to transfer, 816 bytes of data
  transferred 816 bytes in * seconds (*) (glob)

A manifest with a stream clone but no BUNDLESPEC

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/packed.hg
  > EOF

  $ hg clone -U --stream http://localhost:$HGPORT uncompressed-no-bundlespec
  no compatible clone bundles available on server; falling back to regular clone
  (you may want to report this to the server operator)
  streaming all changes
  9 files to transfer, 816 bytes of data
  transferred 816 bytes in * seconds (*) (glob)

A manifest with a gzip bundle and a stream clone

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1
  > EOF

  $ hg clone -U --stream http://localhost:$HGPORT uncompressed-gzip-packed
  applying clone bundle from http://localhost:$HGPORT1/packed.hg
  4 files to transfer, 613 bytes of data
  transferred 613 bytes in * seconds (*) (glob)
  finished applying clone bundle
  searching for changes
  no changes found

A manifest with a gzip bundle and stream clone with supported requirements

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1;requirements%3Drevlogv1
  > EOF

  $ hg clone -U --stream http://localhost:$HGPORT uncompressed-gzip-packed-requirements
  applying clone bundle from http://localhost:$HGPORT1/packed.hg
  4 files to transfer, 613 bytes of data
  transferred 613 bytes in * seconds (*) (glob)
  finished applying clone bundle
  searching for changes
  no changes found

A manifest with a gzip bundle and a stream clone with unsupported requirements

  $ cat > server/.hg/clonebundles.manifest << EOF
  > http://localhost:$HGPORT1/gz-a.hg BUNDLESPEC=gzip-v2
  > http://localhost:$HGPORT1/packed.hg BUNDLESPEC=none-packed1;requirements%3Drevlogv42
  > EOF

  $ hg clone -U --stream http://localhost:$HGPORT uncompressed-gzip-packed-unsupported-requirements
  no compatible clone bundles available on server; falling back to regular clone
  (you may want to report this to the server operator)
  streaming all changes
  9 files to transfer, 816 bytes of data
  transferred 816 bytes in * seconds (*) (glob)

Test clone bundle retrieved through bundle2

  $ cat << EOF >> $HGRCPATH
  > [extensions]
  > largefiles=
  > EOF
  $ killdaemons.py
  $ hg -R server serve -d -p $HGPORT --pid-file hg.pid --accesslog access.log
  $ cat hg.pid >> $DAEMON_PIDS

  $ hg -R server debuglfput gz-a.hg
  1f74b3d08286b9b3a16fb3fa185dd29219cbc6ae

  $ cat > server/.hg/clonebundles.manifest << EOF
  > largefile://1f74b3d08286b9b3a16fb3fa185dd29219cbc6ae BUNDLESPEC=gzip-v2
  > EOF

  $ hg clone -U http://localhost:$HGPORT largefile-provided --traceback
  applying clone bundle from largefile://1f74b3d08286b9b3a16fb3fa185dd29219cbc6ae
  adding changesets
  adding manifests
  adding file changes
  added 2 changesets with 2 changes to 2 files
  finished applying clone bundle
  searching for changes
  no changes found
  2 local changesets published