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