## Summary
Added `uv` to the list of the preserved packages when building the
installer plan. In that case `uv` is not going to be removed when, for
example, using `python -m uv pip sync requirements.txt` when
requirements.txt does not contain `uv`, but `uv` is installed in that
venv.
Closes#1631
## Test Plan
Got through the example attached to
https://github.com/astral-sh/uv/issues/1631 and did see the uv deletion
in the output
```
$ python -m uv pip sync requirements.txt
Installed 1 package in 20ms
+ ruff==0.2.2
```
## Summary
It turns out that it's not uncommon to end up with repeated packages in
requirements files when running `pip-sync`, e.g., you might have
`anyio==4.0.0` specified multiple times. This PR relaxes our assertions
in the install plan to allow such repeated packages, as long as the
requirement markers are exactly the same (i.e., they are truly
duplicates).
Closes https://github.com/astral-sh/uv/issues/1552.
First, replace all usages in files in-place. I used my editor for this.
If someone wants to add a one-liner that'd be fun.
Then, update directory and file names:
```
# Run twice for nested directories
find . -type d -print0 | xargs -0 rename s/puffin/uv/g
find . -type d -print0 | xargs -0 rename s/puffin/uv/g
# Update files
find . -type f -print0 | xargs -0 rename s/puffin/uv/g
```
Then add all the files again
```
# Add all the files again
git add crates
git add python/uv
# This one needs a force-add
git add -f crates/uv-trampoline
```
Charlie Marsh
Alexander Gherm
Zanie Blue