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63 lines
2.2 KiB
Markdown
63 lines
2.2 KiB
Markdown
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# vcpkg_download_distfile
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The latest version of this document lives in the [vcpkg repo](https://github.com/Microsoft/vcpkg/blob/master/docs/maintainers/vcpkg_download_distfile.md).
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Download and cache a file needed for this port.
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This helper should always be used instead of CMake's built-in `file(DOWNLOAD)` command.
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## Usage
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```cmake
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vcpkg_download_distfile(
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<OUT_VARIABLE>
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URLS <http://mainUrl> <http://mirror1>...
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FILENAME <output.zip>
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SHA512 <5981de...>
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[ALWAYS_REDOWNLOAD]
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)
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```
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## Parameters
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### OUT_VARIABLE
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This variable will be set to the full path to the downloaded file. This can then immediately be passed in to [`vcpkg_extract_source_archive`](vcpkg_extract_source_archive.md) for sources.
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### URLS
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A list of URLs to be consulted. They will be tried in order until one of the downloaded files successfully matches the SHA512 given.
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### FILENAME
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The local name for the file. Files are shared between ports, so the file may need to be renamed to make it clearly attributed to this port and avoid conflicts.
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### SHA512
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The expected hash for the file.
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If this doesn't match the downloaded version, the build will be terminated with a message describing the mismatch.
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### QUIET
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Suppress output on cache hit
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### SKIP_SHA512
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Skip SHA512 hash check for file.
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This switch is only valid when building with the `--head` command line flag.
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### ALWAYS_REDOWNLOAD
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Avoid caching; this is a REST call or otherwise unstable.
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Requires `SKIP_SHA512`.
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### HEADERS
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A list of headers to append to the download request. This can be used for authentication during a download.
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Headers should be specified as "<header-name>: <header-value>".
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## Notes
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The helper [`vcpkg_from_github`](vcpkg_from_github.md) should be used for downloading from GitHub projects.
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## Examples
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* [apr](https://github.com/Microsoft/vcpkg/blob/master/ports/apr/portfile.cmake)
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* [fontconfig](https://github.com/Microsoft/vcpkg/blob/master/ports/fontconfig/portfile.cmake)
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* [freetype](https://github.com/Microsoft/vcpkg/blob/master/ports/freetype/portfile.cmake)
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## Source
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[scripts/cmake/vcpkg\_download\_distfile.cmake](https://github.com/Microsoft/vcpkg/blob/master/scripts/cmake/vcpkg_download_distfile.cmake)
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