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72 lines
2.3 KiB
Markdown
72 lines
2.3 KiB
Markdown
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## Patching sources of dependency crates
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Sometimes it is useful to patch the sources of dependency crates without needing
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to wait for an upstream release to include a necessary change, or without
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needing to use a custom git fork.
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The `vendorCargoDeps`, `vendorCargoRegistries`, `vendorGitDeps`, and
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`vendorMultipleCargoDeps` APIs support arbitrary overrides (i.e. patching) at
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the individual crate/repo level when vendoring sources. Checkout their
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respective API documentation for more details, but below is a short quick start
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example:
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```nix
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let
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baseArgs = {
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src = craneLib.cleanCargoSource ./.;
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};
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isNumCpusRepo = p: lib.hasPrefix
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"git+https://github.com/seanmonstar/num_cpus.git"
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p.source;
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isTag1_13_1 = p: lib.hasInfix
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"tag=v1.13.1"
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p.source;
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cargoVendorDir = craneLib.vendorCargoDeps (baseArgs // {
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# Use this function to override crates coming from git dependencies
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overrideVendorGitCheckout = ps: drv:
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# For example, patch a specific repository and tag, in this case num_cpus-1.13.1
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if lib.any (p: (isNumCpusRepo p) && (isTag1_13_1 p)) ps then
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drv.overrideAttrs (_old: {
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# Specifying an arbitrary patch to apply
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patches = [
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./0001-patch-num-cpus.patch
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];
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# Similarly we can also run additional hooks to make changes
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postPatch = ''
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echo running some arbitrary command to make modifications
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'';
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})
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else
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# Nothing to change, leave the derivations as is
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drv;
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# Use this function to override crates coming from any registry checkout
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overrideVendorCargoPackage = p: drv:
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# For example, patch a specific crate, in this case byteorder-1.5.0
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if p.name == "byteorder" && p.version == "1.5.0" then
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drv.overrideAttrs (_old: {
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# Specifying an arbitrary patch to apply
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patches = [
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./0001-patch-byteorder.patch
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];
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# Similarly we can also run additional hooks to make changes
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postPatch = ''
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echo running some arbitrary command to make modifications
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'';
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})
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else
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# Nothing to change, leave the derivations as is
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drv;
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});
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commonArgs = baseArgs // {
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inherit cargoVendorDir;
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};
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in
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craneLib.buildPackage commonArgs
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```
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