view tests/test-lfs-test-server.t @ 42621:99ebde4fec99

commit: improve the files field of changelog for merges

Currently, the files list of merge commits repeats all the deletions
(either actual deletions, or files that got renamed) that happened
between base and p2 of the merge. If p2 is the main branch, the list
can easily be much bigger than the change being merged.

This results in various problems worth improving:
- changelog is bigger than necessary
- `hg log directory` lists many unrelated merge commits, and `hg log
  -v -r commit` frequently fills multiple screens worth of files
- it possibly slows down adjustlinkrev, by forcing it to read more
  manifests, and that function can certainly be a bottleneck
- the server side of pulls can waste a lot of time simply opening the
  filelogs for pointless files (the constant factors for opening even
  a tiny filelog is apparently pretty bad)

So stop listing such files as described in the code.  Impacted merge
commits and their descendants get a different hash than they would
have without this. This doesn't seem problematic, except for
convert. The previous commit helped with that in the hg->hg case (but
if you do svn->hg twice from scratch, hashes can still change).

The rest of the description is numbers. I don't have much to report,
because recreating the files list of existing repositories is not
easy:
- debugupgradeformat and bundle/unbundle don't recreate the list
- export/import tends to choke quickly applying patches or on
  description that contain diffs,
- merge commits from the convert extension don't have the right files
  list for reasons orthogonal to the current commit
- replaying the merge with hg update/hg merge/hg revert --all/hg
  commit can end up failing in hg revert
- I wasn't sure that using debugsetparents + debugrebuilddirstate
  would really build the right thing

I measured commit time before and after this change, in a case with no
files filtered out, several files filtered out (no difference) and 5k
files filtered out (+1% time).

Recreating the 100 more recent merges in a private repo, the
concatenated uncompressed files lists goes from 1.12MB to
0.52MB. Excluding 3 merges that are not representative, then the size
goes from 570k to 15k.
I converted part of mozilla-central, and observed file list shrinking
quite a bit too, starting at the very first merge, 733641d9feaf, going
from 550 files to 10 files (although they have relatively few merges,
so they probably wouldn't care).

Differential Revision: https://phab.mercurial-scm.org/D6613

#require no-reposimplestore no-chg
#testcases git-server hg-server

#if git-server
#require lfs-test-server
#else
#require serve
#endif

#if git-server
  $ LFS_LISTEN="tcp://:$HGPORT"
  $ LFS_HOST="localhost:$HGPORT"
  $ LFS_PUBLIC=1
  $ export LFS_LISTEN LFS_HOST LFS_PUBLIC
#else
  $ LFS_HOST="localhost:$HGPORT/.git/info/lfs"
#endif

#if no-windows git-server
  $ lfs-test-server &> lfs-server.log &
  $ echo $! >> $DAEMON_PIDS
#endif

#if windows git-server
  $ cat >> $TESTTMP/spawn.py <<EOF
  > import os
  > import subprocess
  > import sys
  > 
  > for path in os.environ["PATH"].split(os.pathsep):
  >     exe = os.path.join(path, 'lfs-test-server.exe')
  >     if os.path.exists(exe):
  >         with open('lfs-server.log', 'wb') as out:
  >             p = subprocess.Popen(exe, stdout=out, stderr=out)
  >             sys.stdout.write('%s\n' % p.pid)
  >             sys.exit(0)
  > sys.exit(1)
  > EOF
  $ "$PYTHON" $TESTTMP/spawn.py >> $DAEMON_PIDS
#endif

  $ cat >> $HGRCPATH <<EOF
  > [extensions]
  > lfs=
  > [lfs]
  > url=http://foo:bar@$LFS_HOST
  > track=all()
  > [web]
  > push_ssl = False
  > allow-push = *
  > EOF

Use a separate usercache, otherwise the server sees what the client commits, and
never requests a transfer.

#if hg-server
  $ hg init server
  $ hg --config "lfs.usercache=$TESTTMP/servercache" -R server serve -d \
  >    -p $HGPORT --pid-file=hg.pid -A $TESTTMP/access.log -E $TESTTMP/errors.log
  $ cat hg.pid >> $DAEMON_PIDS
#endif

  $ hg init repo1
  $ cd repo1
  $ echo THIS-IS-LFS > a
  $ hg commit -m a -A a

A push can be serviced directly from the usercache if it isn't in the local
store.

  $ hg init ../repo2
  $ mv .hg/store/lfs .hg/store/lfs_
  $ hg push ../repo2 --debug
  http auth: user foo, password ***
  pushing to ../repo2
  http auth: user foo, password ***
  http auth: user foo, password ***
  query 1; heads
  searching for changes
  1 total queries in *s (glob)
  listing keys for "phases"
  checking for updated bookmarks
  listing keys for "bookmarks"
  lfs: computing set of blobs to upload
  Status: 200
  Content-Length: 309 (git-server !)
  Content-Length: 350 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "upload": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (git-server !)
            "href": "http://localhost:$HGPORT/.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (hg-server !)
          }
        }
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: uploading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
  Status: 200 (git-server !)
  Status: 201 (hg-server !)
  Content-Length: 0
  Content-Type: text/plain; charset=utf-8
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
  lfs: uploaded 1 files (12 bytes)
  1 changesets found
  list of changesets:
  99a7098854a3984a5c9eab0fc7a2906697b7cb5c
  bundle2-output-bundle: "HG20", 4 parts total
  bundle2-output-part: "replycaps" * bytes payload (glob)
  bundle2-output-part: "check:heads" streamed payload
  bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
  bundle2-output-part: "phase-heads" 24 bytes payload
  bundle2-input-bundle: with-transaction
  bundle2-input-part: "replycaps" supported
  bundle2-input-part: total payload size * (glob)
  bundle2-input-part: "check:heads" supported
  bundle2-input-part: total payload size 20
  bundle2-input-part: "changegroup" (params: 1 mandatory) supported
  adding changesets
  add changeset 99a7098854a3
  adding manifests
  adding file changes
  adding a revisions
  added 1 changesets with 1 changes to 1 files
  calling hook pretxnchangegroup.lfs: hgext.lfs.checkrequireslfs
  bundle2-input-part: total payload size 617
  bundle2-input-part: "phase-heads" supported
  bundle2-input-part: total payload size 24
  bundle2-input-bundle: 3 parts total
  updating the branch cache
  bundle2-output-bundle: "HG20", 1 parts total
  bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
  bundle2-input-bundle: no-transaction
  bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
  bundle2-input-bundle: 0 parts total
  listing keys for "phases"
  $ mv .hg/store/lfs_ .hg/store/lfs

Clear the cache to force a download
  $ rm -rf `hg config lfs.usercache`
  $ cd ../repo2
  $ hg update tip --debug
  http auth: user foo, password ***
  resolving manifests
   branchmerge: False, force: False, partial: False
   ancestor: 000000000000, local: 000000000000+, remote: 99a7098854a3
  http auth: user foo, password ***
  Status: 200
  Content-Length: 311 (git-server !)
  Content-Length: 352 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (glob)
          }
        }
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: downloading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
  Status: 200
  Content-Length: 12
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b to the usercache
  lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
  lfs: downloaded 1 files (12 bytes)
   a: remote created -> g
  getting a
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  1 files updated, 0 files merged, 0 files removed, 0 files unresolved

When the server has some blobs already.  `hg serve` doesn't offer to upload
blobs that it already knows about.  Note that lfs-test-server is simply
toggling the action to 'download'.  The Batch API spec says it should omit the
actions property completely.

  $ hg mv a b
  $ echo ANOTHER-LARGE-FILE > c
  $ echo ANOTHER-LARGE-FILE2 > d
  $ hg commit -m b-and-c -A b c d
  $ hg push ../repo1 --debug
  http auth: user foo, password ***
  pushing to ../repo1
  http auth: user foo, password ***
  http auth: user foo, password ***
  query 1; heads
  searching for changes
  all remote heads known locally
  listing keys for "phases"
  checking for updated bookmarks
  listing keys for "bookmarks"
  listing keys for "bookmarks"
  lfs: computing set of blobs to upload
  Status: 200
  Content-Length: 901 (git-server !)
  Content-Length: 755 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": { (git-server !)
          "download": { (git-server !)
            "expires_at": "$ISO_8601_DATE_TIME$" (git-server !)
            "header": { (git-server !)
              "Accept": "application/vnd.git-lfs" (git-server !)
            } (git-server !)
            "href": "http://localhost:$HGPORT/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (git-server !)
          } (git-server !)
        } (git-server !)
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
      {
        "actions": {
          "upload": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19" (glob)
          }
        }
        "oid": "37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19"
        "size": 20
      }
      {
        "actions": {
          "upload": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (glob)
          }
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: need to transfer 2 objects (39 bytes)
  lfs: uploading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
  Status: 200 (git-server !)
  Status: 201 (hg-server !)
  Content-Length: 0
  Content-Type: text/plain; charset=utf-8
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
  lfs: uploading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
  Status: 200 (git-server !)
  Status: 201 (hg-server !)
  Content-Length: 0
  Content-Type: text/plain; charset=utf-8
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  lfs: uploaded 2 files (39 bytes)
  1 changesets found
  list of changesets:
  dfca2c9e2ef24996aa61ba2abd99277d884b3d63
  bundle2-output-bundle: "HG20", 5 parts total
  bundle2-output-part: "replycaps" * bytes payload (glob)
  bundle2-output-part: "check:phases" 24 bytes payload
  bundle2-output-part: "check:heads" streamed payload
  bundle2-output-part: "changegroup" (params: 1 mandatory) streamed payload
  bundle2-output-part: "phase-heads" 24 bytes payload
  bundle2-input-bundle: with-transaction
  bundle2-input-part: "replycaps" supported
  bundle2-input-part: total payload size * (glob)
  bundle2-input-part: "check:phases" supported
  bundle2-input-part: total payload size 24
  bundle2-input-part: "check:heads" supported
  bundle2-input-part: total payload size 20
  bundle2-input-part: "changegroup" (params: 1 mandatory) supported
  adding changesets
  add changeset dfca2c9e2ef2
  adding manifests
  adding file changes
  adding b revisions
  adding c revisions
  adding d revisions
  added 1 changesets with 3 changes to 3 files
  bundle2-input-part: total payload size 1315
  bundle2-input-part: "phase-heads" supported
  bundle2-input-part: total payload size 24
  bundle2-input-bundle: 4 parts total
  updating the branch cache
  bundle2-output-bundle: "HG20", 1 parts total
  bundle2-output-part: "reply:changegroup" (advisory) (params: 0 advisory) empty payload
  bundle2-input-bundle: no-transaction
  bundle2-input-part: "reply:changegroup" (advisory) (params: 0 advisory) supported
  bundle2-input-bundle: 0 parts total
  listing keys for "phases"

Clear the cache to force a download
  $ rm -rf `hg config lfs.usercache`
  $ hg --repo ../repo1 update tip --debug
  http auth: user foo, password ***
  resolving manifests
   branchmerge: False, force: False, partial: False
   ancestor: 99a7098854a3, local: 99a7098854a3+, remote: dfca2c9e2ef2
  http auth: user foo, password ***
  Status: 200
  Content-Length: 608 (git-server !)
  Content-Length: 670 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19" (glob)
          }
        }
        "oid": "37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19"
        "size": 20
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (glob)
          }
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: need to transfer 2 objects (39 bytes)
  lfs: downloading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
  Status: 200
  Content-Length: 20
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 to the usercache
  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
  lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
  Status: 200
  Content-Length: 19
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 to the usercache
  lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  lfs: downloaded 2 files (39 bytes)
   b: remote created -> g
  getting b
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
   c: remote created -> g
  getting c
  lfs: found d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 in the local lfs store
   d: remote created -> g
  getting d
  lfs: found 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 in the local lfs store
  3 files updated, 0 files merged, 0 files removed, 0 files unresolved

Test a corrupt file download, but clear the cache first to force a download.
`hg serve` indicates a corrupt file without transferring it, unlike
lfs-test-server.

  $ rm -rf `hg config lfs.usercache`
#if git-server
  $ cp $TESTTMP/lfs-content/d1/1e/1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 blob
  $ echo 'damage' > $TESTTMP/lfs-content/d1/1e/1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
#else
  $ cp $TESTTMP/server/.hg/store/lfs/objects/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 blob
  $ echo 'damage' > $TESTTMP/server/.hg/store/lfs/objects/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
#endif
  $ rm ../repo1/.hg/store/lfs/objects/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  $ rm ../repo1/*

TODO: give the proper error indication from `hg serve`

  $ hg --repo ../repo1 update -C tip --debug
  http auth: user foo, password ***
  resolving manifests
   branchmerge: False, force: True, partial: False
   ancestor: dfca2c9e2ef2+, local: dfca2c9e2ef2+, remote: dfca2c9e2ef2
  http auth: user foo, password ***
  Status: 200
  Content-Length: 311 (git-server !)
  Content-Length: 183 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": { (git-server !)
          "download": { (git-server !)
            "expires_at": "$ISO_8601_DATE_TIME$" (git-server !)
            "header": { (git-server !)
              "Accept": "application/vnd.git-lfs" (git-server !)
            } (git-server !)
            "href": "http://localhost:$HGPORT/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (git-server !)
          } (git-server !)
        "error": { (hg-server !)
          "code": 422 (hg-server !)
          "message": "The object is corrupt" (hg-server !)
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes) (git-server !)
  Status: 200 (git-server !)
  Content-Length: 7 (git-server !)
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Date: $HTTP_DATE$ (git-server !)
  abort: corrupt remote lfs object: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (git-server !)
  abort: LFS server error for "c": Validation error! (hg-server !)
  [255]

The corrupted blob is not added to the usercache or local store

  $ test -f ../repo1/.hg/store/lfs/objects/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  [1]
  $ test -f `hg config lfs.usercache`/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  [1]
#if git-server
  $ cp blob $TESTTMP/lfs-content/d1/1e/1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
#else
  $ cp blob $TESTTMP/server/.hg/store/lfs/objects/d1/1e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
#endif

Test a corrupted file upload

  $ echo 'another lfs blob' > b
  $ hg ci -m 'another blob'
  $ echo 'damage' > .hg/store/lfs/objects/e6/59058e26b07b39d2a9c7145b3f99b41f797b6621c8076600e9cb7ee88291f0
  $ hg push --debug ../repo1
  http auth: user foo, password ***
  pushing to ../repo1
  http auth: user foo, password ***
  http auth: user foo, password ***
  query 1; heads
  searching for changes
  all remote heads known locally
  listing keys for "phases"
  checking for updated bookmarks
  listing keys for "bookmarks"
  listing keys for "bookmarks"
  lfs: computing set of blobs to upload
  Status: 200
  Content-Length: 309 (git-server !)
  Content-Length: 350 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "upload": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/e659058e26b07b39d2a9c7145b3f99b41f797b6621c8076600e9cb7ee88291f0" (glob)
          }
        }
        "oid": "e659058e26b07b39d2a9c7145b3f99b41f797b6621c8076600e9cb7ee88291f0"
        "size": 17
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: uploading e659058e26b07b39d2a9c7145b3f99b41f797b6621c8076600e9cb7ee88291f0 (17 bytes)
  abort: detected corrupt lfs object: e659058e26b07b39d2a9c7145b3f99b41f797b6621c8076600e9cb7ee88291f0
  (run hg verify)
  [255]

Archive will prefetch blobs in a group

  $ rm -rf .hg/store/lfs `hg config lfs.usercache`
  $ hg archive --debug -r 1 ../archive
  http auth: user foo, password ***
  http auth: user foo, password ***
  Status: 200
  Content-Length: 905 (git-server !)
  Content-Length: 988 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (glob)
          }
        }
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19" (glob)
          }
        }
        "oid": "37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19"
        "size": 20
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (glob)
          }
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: need to transfer 3 objects (51 bytes)
  lfs: downloading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
  Status: 200
  Content-Length: 12
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b to the usercache
  lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
  lfs: downloading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
  Status: 200
  Content-Length: 20
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 to the usercache
  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
  lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
  Status: 200
  Content-Length: 19
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 to the usercache
  lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  lfs: downloaded 3 files (51 bytes)
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  lfs: found d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 in the local lfs store
  lfs: found 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 in the local lfs store
  $ find ../archive | sort
  ../archive
  ../archive/.hg_archival.txt
  ../archive/a
  ../archive/b
  ../archive/c
  ../archive/d

Cat will prefetch blobs in a group

  $ rm -rf .hg/store/lfs `hg config lfs.usercache`
  $ hg cat --debug -r 1 a b c nonexistent
  http auth: user foo, password ***
  http auth: user foo, password ***
  Status: 200
  Content-Length: 608 (git-server !)
  Content-Length: 670 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (glob)
          }
        }
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (glob)
          }
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: need to transfer 2 objects (31 bytes)
  lfs: downloading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
  Status: 200
  Content-Length: 12
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b to the usercache
  lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
  lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
  Status: 200
  Content-Length: 19
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 to the usercache
  lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  lfs: downloaded 2 files (31 bytes)
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  THIS-IS-LFS
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  THIS-IS-LFS
  lfs: found d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 in the local lfs store
  ANOTHER-LARGE-FILE
  nonexistent: no such file in rev dfca2c9e2ef2

Revert will prefetch blobs in a group

  $ rm -rf .hg/store/lfs
  $ rm -rf `hg config lfs.usercache`
  $ rm *
  $ hg revert --all -r 1 --debug
  http auth: user foo, password ***
  http auth: user foo, password ***
  Status: 200
  Content-Length: 905 (git-server !)
  Content-Length: 988 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b" (glob)
          }
        }
        "oid": "31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b"
        "size": 12
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19" (glob)
          }
        }
        "oid": "37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19"
        "size": 20
      }
      {
        "actions": {
          "download": {
            "expires_at": "$ISO_8601_DATE_TIME$"
            "header": {
              "Accept": "application/vnd.git-lfs"
            }
            "href": "http://localhost:$HGPORT/*/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998" (glob)
          }
        }
        "oid": "d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998"
        "size": 19
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  lfs: need to transfer 3 objects (51 bytes)
  lfs: downloading 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b (12 bytes)
  Status: 200
  Content-Length: 12
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b to the usercache
  lfs: processed: 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b
  lfs: downloading 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 (20 bytes)
  Status: 200
  Content-Length: 20
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 to the usercache
  lfs: processed: 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19
  lfs: downloading d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 (19 bytes)
  Status: 200
  Content-Length: 19
  Content-Type: text/plain; charset=utf-8 (git-server !)
  Content-Type: application/octet-stream (hg-server !)
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  lfs: adding d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 to the usercache
  lfs: processed: d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998
  lfs: downloaded 3 files (51 bytes)
  reverting b
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store
  reverting c
  lfs: found d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 in the local lfs store
  reverting d
  lfs: found 37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 in the local lfs store
  adding a
  lfs: found 31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b in the local lfs store

Check error message when the remote missed a blob:

  $ echo FFFFF > b
  $ hg commit -m b -A b
  $ echo FFFFF >> b
  $ hg commit -m b b
  $ rm -rf .hg/store/lfs
  $ rm -rf `hg config lfs.usercache`
  $ hg update -C '.^' --debug
  http auth: user foo, password ***
  resolving manifests
   branchmerge: False, force: True, partial: False
   ancestor: 62fdbaf221c6+, local: 62fdbaf221c6+, remote: ef0564edf47e
  http auth: user foo, password ***
  Status: 200
  Content-Length: 308 (git-server !)
  Content-Length: 186 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": { (git-server !)
          "upload": { (git-server !)
            "expires_at": "$ISO_8601_DATE_TIME$" (git-server !)
            "header": { (git-server !)
              "Accept": "application/vnd.git-lfs" (git-server !)
            } (git-server !)
            "href": "http://localhost:$HGPORT/objects/8e6ea5f6c066b44a0efa43bcce86aea73f17e6e23f0663df0251e7524e140a13" (git-server !)
          } (git-server !)
        "error": { (hg-server !)
          "code": 404 (hg-server !)
          "message": "The object does not exist" (hg-server !)
        }
        "oid": "8e6ea5f6c066b44a0efa43bcce86aea73f17e6e23f0663df0251e7524e140a13"
        "size": 6
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  abort: LFS server error for "b": The object does not exist!
  [255]

Check error message when object does not exist:

  $ cd $TESTTMP
  $ hg init test && cd test
  $ echo "[extensions]" >> .hg/hgrc
  $ echo "lfs=" >> .hg/hgrc
  $ echo "[lfs]" >> .hg/hgrc
  $ echo "threshold=1" >> .hg/hgrc
  $ echo a > a
  $ hg add a
  $ hg commit -m 'test'
  $ echo aaaaa > a
  $ hg commit -m 'largefile'
  $ hg debugdata a 1 # verify this is no the file content but includes "oid", the LFS "pointer".
  version https://git-lfs.github.com/spec/v1
  oid sha256:bdc26931acfb734b142a8d675f205becf27560dc461f501822de13274fe6fc8a
  size 6
  x-is-binary 0
  $ cd ..
  $ rm -rf `hg config lfs.usercache`

(Restart the server in a different location so it no longer has the content)

  $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS

#if hg-server
  $ cat $TESTTMP/access.log $TESTTMP/errors.log
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "PUT /.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b HTTP/1.1" 201 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "PUT /.hg/lfs/objects/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 HTTP/1.1" 201 - (glob)
  $LOCALIP - - [$LOGDATE$] "PUT /.hg/lfs/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 HTTP/1.1" 201 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/31cf46fbc4ecd458a0943c5b4881f1f5a6dd36c53d6167d5b69ac45149b38e5b HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/37a65ab78d5ecda767e8622c248b5dbff1e68b1678ab0e730d5eb8601ec8ad19 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "GET /.hg/lfs/objects/d11e1a642b60813aee592094109b406089b8dff4cb157157f753418ec7857998 HTTP/1.1" 200 - (glob)
  $LOCALIP - - [$LOGDATE$] "POST /.git/info/lfs/objects/batch HTTP/1.1" 200 - (glob)
#endif

  $ mkdir $TESTTMP/lfs-server2
  $ cd $TESTTMP/lfs-server2
#if no-windows git-server
  $ lfs-test-server &> lfs-server.log &
  $ echo $! >> $DAEMON_PIDS
#endif

#if windows git-server
  $ "$PYTHON" $TESTTMP/spawn.py >> $DAEMON_PIDS
#endif

#if hg-server
  $ hg init server2
  $ hg --config "lfs.usercache=$TESTTMP/servercache2" -R server2 serve -d \
  >    -p $HGPORT --pid-file=hg.pid -A $TESTTMP/access.log -E $TESTTMP/errors.log
  $ cat hg.pid >> $DAEMON_PIDS
#endif

  $ cd $TESTTMP
  $ hg --debug clone test test2
  http auth: user foo, password ***
  linked 6 files
  http auth: user foo, password ***
  updating to branch default
  resolving manifests
   branchmerge: False, force: False, partial: False
   ancestor: 000000000000, local: 000000000000+, remote: d2a338f184a8
  http auth: user foo, password ***
  Status: 200
  Content-Length: 308 (git-server !)
  Content-Length: 186 (hg-server !)
  Content-Type: application/vnd.git-lfs+json
  Date: $HTTP_DATE$
  Server: testing stub value (hg-server !)
  {
    "objects": [
      {
        "actions": { (git-server !)
          "upload": { (git-server !)
            "expires_at": "$ISO_8601_DATE_TIME$" (git-server !)
            "header": { (git-server !)
              "Accept": "application/vnd.git-lfs" (git-server !)
            } (git-server !)
            "href": "http://localhost:$HGPORT/objects/bdc26931acfb734b142a8d675f205becf27560dc461f501822de13274fe6fc8a" (git-server !)
          } (git-server !)
        "error": { (hg-server !)
          "code": 404 (hg-server !)
          "message": "The object does not exist" (hg-server !)
        }
        "oid": "bdc26931acfb734b142a8d675f205becf27560dc461f501822de13274fe6fc8a"
        "size": 6
      }
    ]
    "transfer": "basic" (hg-server !)
  }
  abort: LFS server error for "a": The object does not exist!
  [255]

  $ "$PYTHON" $RUNTESTDIR/killdaemons.py $DAEMON_PIDS