upstream/mercurial-mirror Files · tests/test-largefiles-small-disk.t

wireprotov2: define and implement "manifestdata" command...

wireprotov2: define and implement "manifestdata" command The added command can be used for obtaining manifest data. Given a manifest path and set of manifest nodes, data about manifests can be retrieved. Unlike changeset data, we wish to emit deltas to describe manifest revisions. So the command uses the relatively new API for building delta requests and emitting them. The code calls into deltaparent(), which I'm not very keen of. There's still work to be done in delta generation land so implementation details of storage (e.g. exactly one delta is stored/available) don't creep into higher levels. But we can worry about this later (there is already a TODO on imanifestorage tracking this). On the subject of parent deltas, the server assumes parent revisions exist on the receiving end. This is obviously wrong for shallow clone. I've added TODOs to add a mechanism to the command to allow clients to specify desired behavior. This shouldn't be too difficult to implement. Another big change is that the client must explicitly request manifest nodes to retrieve. This is a major departure from "getbundle," where the server derives relevant manifests as it iterates changesets and sends them automatically. As implemented, the client must transmit each requested node to the server. At 20 bytes per node, we're looking at 2 MB per 100,000 nodes. Plus wire encoding overhead. This isn't ideal for clients with limited upload bandwidth. I plan to address this in the future by allowing alternate mechanisms for defining the revisions to retrieve. One idea is to define a range of changeset revisions whose manifest revisions to retrieve (similar to how "changesetdata" works). We almost certainly want an API to look up an individual manifest by node. And that's where I've chosen to start with the implementation. Again, a theme of this early exchangev2 work is I want to start by building primitives for accessing raw repository data first and see how far we can get with those before we need more complexity. Differential Revision: https://phab.mercurial-scm.org/D4488

Gregory Szorc - - Load All Authors

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      Test how largefiles abort in case the disk runs full

        $ cat > criple.py <<EOF

        > from __future__ import absolute_import

        > import errno

        > import os

        > import shutil

        > from mercurial import util

        > #

        > # this makes the original largefiles code abort:

        > _origcopyfileobj = shutil.copyfileobj

        > def copyfileobj(fsrc, fdst, length=16*1024):

        >     # allow journal files (used by transaction) to be written

        >     if b'journal.' in fdst.name:

        >         return _origcopyfileobj(fsrc, fdst, length)

        >     fdst.write(fsrc.read(4))

        >     raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))

        > shutil.copyfileobj = copyfileobj

        > #

        > # this makes the rewritten code abort:

        > def filechunkiter(f, size=131072, limit=None):

        >     yield f.read(4)

        >     raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))

        > util.filechunkiter = filechunkiter

        > #

        > def oslink(src, dest):

        >     raise OSError("no hardlinks, try copying instead")

        > util.oslink = oslink

        > EOF

        $ echo "[extensions]" >> $HGRCPATH

        $ echo "largefiles =" >> $HGRCPATH

        $ hg init alice

        $ cd alice

        $ echo "this is a very big file" > big

        $ hg add --large big

        $ hg commit --config extensions.criple=$TESTTMP/criple.py -m big

        abort: No space left on device

        [255]

      The largefile is not created in .hg/largefiles:

        $ ls .hg/largefiles

        dirstate

      The user cache is not even created:

        >>> import os; os.path.exists("$HOME/.cache/largefiles/")

        False

      Make the commit with space on the device:

        $ hg commit -m big

      Now make a clone with a full disk, and make sure lfutil.link function

      makes copies instead of hardlinks:

        $ cd ..

        $ hg --config extensions.criple=$TESTTMP/criple.py clone --pull alice bob

        requesting all changes

        adding changesets

        adding manifests

        adding file changes

        added 1 changesets with 1 changes to 1 files

        new changesets 390cf214e9ac

        updating to branch default

        getting changed largefiles

        abort: No space left on device

        [255]

      The largefile is not created in .hg/largefiles:

        $ ls bob/.hg/largefiles

        dirstate

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				Test how largefiles abort in case the disk runs full

				$ cat > criple.py <<EOF
				> from __future__ import absolute_import
				> import errno
				> import os
				> import shutil
				> from mercurial import util
				> #
				> # this makes the original largefiles code abort:
				> _origcopyfileobj = shutil.copyfileobj
				> def copyfileobj(fsrc, fdst, length=16*1024):
				> # allow journal files (used by transaction) to be written
				> if b'journal.' in fdst.name:
				> return _origcopyfileobj(fsrc, fdst, length)
				> fdst.write(fsrc.read(4))
				> raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
				> shutil.copyfileobj = copyfileobj
				> #
				> # this makes the rewritten code abort:
				> def filechunkiter(f, size=131072, limit=None):
				> yield f.read(4)
				> raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
				> util.filechunkiter = filechunkiter
				> #
				> def oslink(src, dest):
				> raise OSError("no hardlinks, try copying instead")
				> util.oslink = oslink
				> EOF

				$ echo "[extensions]" >> $HGRCPATH
				$ echo "largefiles =" >> $HGRCPATH

				$ hg init alice
				$ cd alice
				$ echo "this is a very big file" > big
				$ hg add --large big
				$ hg commit --config extensions.criple=$TESTTMP/criple.py -m big
				abort: No space left on device
				[255]

				The largefile is not created in .hg/largefiles:

				$ ls .hg/largefiles
				dirstate

				The user cache is not even created:

				>>> import os; os.path.exists("$HOME/.cache/largefiles/")
				False

				Make the commit with space on the device:

				$ hg commit -m big

				Now make a clone with a full disk, and make sure lfutil.link function
				makes copies instead of hardlinks:

				$ cd ..
				$ hg --config extensions.criple=$TESTTMP/criple.py clone --pull alice bob
				requesting all changes
				adding changesets
				adding manifests
				adding file changes
				added 1 changesets with 1 changes to 1 files
				new changesets 390cf214e9ac
				updating to branch default
				getting changed largefiles
				abort: No space left on device
				[255]

				The largefile is not created in .hg/largefiles:

				$ ls bob/.hg/largefiles
				dirstate