Download Hatch 1.18.0

Changed:
- Upgrade default CPython distributions to 20260807
Added:
- Add the sources environment option, which redirects dependencies to a local path, Git repository, URL, alternate index, or workspace member at install time without altering published metadata. The top-level [tool.hatch.sources] table is an alias for the default environment, environments inherit sources entry by entry, the HATCH_NO_SOURCES environment variable disables them, and hatch dep show sources reports what each source redirects
- Add the --all/-a flag to the build command to build the workspace root and every workspace member defined by the selected environment, consolidating artifacts in the workspace root's dist directory by default. A root that does not define a project table is skipped so that a top-level pyproject.toml may only contain workspace configuration
- Add the tool.hatch.requires-hatch field, a version specifier set that commands reading the project's metadata enforce against the running version of Hatch
- Add first-class support for free-threaded distribution names such as 3.13t and 3.14t to the python commands and environment python option, rather than requiring the HATCH_PYTHON_VARIANT_GIL environment variable
- The version command can now bump versions that are statically defined by the project.version field, updating pyproject.toml in place. Pass --force to allow an explicit downgrade
- Support managing Python 3.15 distributions, currently 3.15.0rc1
Fixed:
- Erase stale coverage data before running hatch test --cover.
- Fix environment creation crashing when a metadata hook exists that doesn’t happen to be installed in the hatch CLI’s environment.
- Fix commands run by hatch run no longer being interruptible with Ctrl-C, which happened because the ignored SIGINT of the parent process was inherited by the child process.
- Fix the generated Pyrefly config being invalid on Windows, since backslashes in the absolute paths were interpreted as TOML escape sequences.
- Fix the hardcoded reliance on pip when installing dependencies internally by using uv instead.
- Fix environment creation silently installing a GIL-enabled Python distribution when Hatch itself runs on a free-threaded build. The distribution matching the running interpreter, such as 3.14t, is now selected.
- Fix free-threaded selectors such as 3.14t being rejected by an environment's python option, even though hatch python install 3.14t already accepted them.
- Never automatically select a prerelease Python distribution, such as 3.15.0rc1, when falling back to the latest compatible version. A prerelease is still installed when requested explicitly.