annotate tests/test-largefiles-small-disk.t @ 44185:a19331456d48

rust-nodemap: mutable NodeTree data structure Thanks to the previously indexing abstraction, the only difference in the lookup algorithm is that we don't need the special case for an empty NodeTree any more. We've considered making the mutable root an `Option<Block>`, but that leads to unpleasant checks and `unwrap()` unless we abstract it as typestate patterns (`NodeTree<Immutable>` and `NodeTree<Mutated>`) which seem exaggerated in that case. The initial copy of the root block is a very minor performance penalty, given that it typically occurs just once per transaction. Differential Revision: https://phab.mercurial-scm.org/D7793
author Georges Racinet <georges.racinet@octobus.net>
date Fri, 27 Dec 2019 15:11:43 +0100
parents c70bdd222dcd
children 42d2b31cee0b
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1 Test how largefiles abort in case the disk runs full
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2
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3 $ cat > criple.py <<EOF
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4 > from __future__ import absolute_import
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5 > import errno
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6 > import os
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7 > import shutil
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8 > from mercurial import util
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9 > #
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10 > # this makes the original largefiles code abort:
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11 > _origcopyfileobj = shutil.copyfileobj
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12 > def copyfileobj(fsrc, fdst, length=16 * 1024):
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13 > # allow journal files (used by transaction) to be written
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14 > if b'journal.' in fdst.name:
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15 > return _origcopyfileobj(fsrc, fdst, length)
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16 > fdst.write(fsrc.read(4))
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17 > raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
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18 > shutil.copyfileobj = copyfileobj
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19 > #
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20 > # this makes the rewritten code abort:
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21 > def filechunkiter(f, size=131072, limit=None):
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22 > yield f.read(4)
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23 > raise IOError(errno.ENOSPC, os.strerror(errno.ENOSPC))
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24 > util.filechunkiter = filechunkiter
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25 > #
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26 > def oslink(src, dest):
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27 > raise OSError("no hardlinks, try copying instead")
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28 > util.oslink = oslink
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29 > EOF
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30
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31 $ echo "[extensions]" >> $HGRCPATH
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32 $ echo "largefiles =" >> $HGRCPATH
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33
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34 $ hg init alice
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35 $ cd alice
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36 $ echo "this is a very big file" > big
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37 $ hg add --large big
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38 $ hg commit --config extensions.criple=$TESTTMP/criple.py -m big
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39 abort: No space left on device
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40 [255]
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42 The largefile is not created in .hg/largefiles:
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43
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44 $ ls .hg/largefiles
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45 dirstate
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47 The user cache is not even created:
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48
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49 >>> import os; os.path.exists("$HOME/.cache/largefiles/")
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50 False
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51
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52 Make the commit with space on the device:
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53
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54 $ hg commit -m big
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55
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56 Now make a clone with a full disk, and make sure lfutil.link function
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57 makes copies instead of hardlinks:
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58
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59 $ cd ..
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60 $ hg --config extensions.criple=$TESTTMP/criple.py clone --pull alice bob
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61 requesting all changes
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62 adding changesets
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63 adding manifests
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64 adding file changes
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65 added 1 changesets with 1 changes to 1 files
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66 new changesets 390cf214e9ac
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67 updating to branch default
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68 getting changed largefiles
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69 abort: No space left on device
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70 [255]
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71
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72 The largefile is not created in .hg/largefiles:
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73
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74 $ ls bob/.hg/largefiles
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75 dirstate