view tests/test-largefiles-small-disk.t @ 51815:460e80488cf0

typing: lock in correct changes from pytype 2023.04.11 -> 2023.06.16

There were a handful of other changes to the pyi files generated when updating
pytype locally (and jumping from python 3.8.0 to python 3.10.11), but they were
not as clear (e.g. the embedded type in a list changing from `nothing` to `Any`
or similar).  These looked obviously correct, and agreed with PyCharm's thoughts
on the signatures.

Oddly, even though pytype starting inferring `obsutil._getfilteredreason()` as
returning bytes, it (correctly) complained about the None path when it was typed
that way.  Instead, raise a ProgrammingError if an unhandled fate is calculated.
(Currently, all possibilities are handled, so this isn't reachable unless
another fate is added in the future.)

Test how largefiles abort in case the disk runs full

  $ cat > criple.py <<EOF
  > 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 or b'backup.' 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