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Document mirror structure and download cache

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Ivan Pozdeev 2024-06-10 23:20:20 +03:00
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plugins/python-build/README.md
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@ -227,14 +227,30 @@ definition. (All bundled definitions include checksums.)
### Package download mirrors
python-build will first attempt to download package files from a mirror hosted on
GitHub Pages. If a package is not available on the mirror, if the mirror
is down, or if the download is corrupt, python-build will fall back to the
GitHub Pages. If this fails, it will fall back to the
official URL specified in the definition file.
You can point python-build to another mirror by specifying the
`PYTHON_BUILD_MIRROR_URL` environment variable--useful if you'd like to run your
own local mirror, for example. Package mirror URLs are constructed by joining
this variable with the SHA2 checksum of the package file.
`PYTHON_BUILD_MIRROR_URL` environment variable.
Package mirror URLs are constructed by joining
`$PYTHON_BUILD_MIRROR_URL` with the SHA2 checksum of the package file as specified in the URL
in the installation script (the part after the hash sign). E.g.:
```
https://mycache.example.com/0419e9085bf51b7a672009b3f50dbf1859acdf18ba725d0ec19aa5c8503f0ea3
```
If you have replicated the directory structure of an official site, the easiest way to adapt
would be to make symlinks at the mirror's root:
```
0419e9085bf51b7a672009b3f50dbf1859acdf18ba725d0ec19aa5c8503f0ea3 -> 3.10.10/Python-3.10.10.tar.xz
```
The rationale is to abstract away difference between directory structures of sites
of various Python flavors and their occasional changes as well as to accomodate
people who only wish to cache some select downloads. This also allows to mirror multiple sites at once.
If the mirror being used does not have the same checksum (*e.g.* with a
pull-through cache like Artifactory), you can set the
@ -247,15 +263,15 @@ mirror by setting the `PYTHON_BUILD_SKIP_MIRROR` environment variable.
The official python-build download mirror is provided by
[GitHub Pages](http://yyuu.github.io/pythons/).
### Package download caching
### Package download cache
You can instruct python-build to keep a local cache of downloaded package files
by setting the `PYTHON_BUILD_CACHE_PATH` environment variable. When set, package
files will be kept in this directory after the first successful download and
reused by subsequent invocations of `python-build` and `pyenv install`.
Python-build will keep a cache of downloaded package files
at the location specified by the `PYTHON_BUILD_CACHE_PATH` environment variable
if it exists. The default is `~/.pyenv/cache`, so you can
enable caching by just creating that directory.
The `pyenv install` command defaults this path to `~/.pyenv/cache`, so in most
cases you can enable download caching simply by creating that directory.
The name of the would-be cached file is reported by Pyenv in the "Downloading <filename>..." message.
It's possible to warm up the cache by manually putting the file there under an appropriate name.
### Keeping the build directory after installation