view tests/test-archive-symlinks.t @ 41188:006c9ce486fa

rust-cpython: bindings for MissingAncestors

The exposition is rather straightforward, except for the
remove_ancestors_from() method, which forces us to an inefficient
conversion between Python sets and Rust HashSets.

Two alternatives are proposed in comments:

- changing the inner API to "emit" the revision numbers to discard
  this would be a substantial change, and it would be better only in the
  cases where there are more to retain than to discard
- mutating the Python set directly: this would force us to define an abstract
  `RevisionSet` trait, and implement it both for plain `HashSet` and for
  a struct enclosing a Python set with the GIL marker `Python<'p>`, also a non
  trivial effort.

The main (and seemingly only) caller of this method being
`mercurial.setdiscovery`, which is currently undergoing serious refactoring,
it's not clear whether these improvements would be worth the effort right now,
so we're leaving it as-is.

Also, in `get_bases()` (will also be used by `setdiscovery`), we'd prefer
to build a Python set directly, but we resort to returning a tuple, waiting
to hear back from our PR onto rust-cpython about that

Differential Revision: https://phab.mercurial-scm.org/D5550

#require symlink

  $ origdir=`pwd`

  $ hg init repo
  $ cd repo
  $ ln -s nothing dangling

avoid tar warnings about old timestamp

  $ hg ci -d '2000-01-01 00:00:00 +0000' -qAm 'add symlink'

  $ hg archive -t files ../archive
  $ hg archive -t tar -p tar ../archive.tar
  $ hg archive -t zip -p zip ../archive.zip

files

  $ cd "$origdir"
  $ cd archive
  $ readlink.py dangling
  dangling -> nothing

tar

  $ cd "$origdir"
  $ tar xf archive.tar
  $ cd tar
  $ readlink.py dangling
  dangling -> nothing

#if unziplinks
zip

  $ cd "$origdir"
  $ unzip archive.zip > /dev/null 2>&1
  $ cd zip
  $ readlink.py dangling
  dangling -> nothing
#endif

  $ cd ..