patch(ctx, patches, patch_cmds, patch_cmds_win, patch_tool, patch_args, auth, patch_directory)Implementation of patching an already extracted repository. This rule is intended to be used in the implementation function of a repository rule. If the parameters `patches`, `patch_tool`, `patch_args`, `patch_cmds` and `patch_cmds_win` are not specified then they are taken from `ctx.attr`. **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | ctx | The repository context of the repository rule calling this utility function. | none | | patches | The patch files to apply. List of strings, Labels, or paths. |
None |
| patch_cmds | Bash commands to run for patching, passed one at a time to bash -c. List of strings | None |
| patch_cmds_win | Powershell commands to run for patching, passed one at a time to powershell /c. List of strings. If the boolean value of this parameter is false, patch_cmds will be used and this parameter will be ignored. | None |
| patch_tool | Path of the patch tool to execute for applying patches. String. | None |
| patch_args | Arguments to pass to the patch tool. List of strings. | None |
| auth | An optional dict specifying authentication information for some of the URLs. | None |
| patch_directory | Directory to apply the patches in | None |
## repo_utils.is_darwin
repo_utils.is_darwin(rctx)Returns true if the host operating system is Darwin **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx |
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| none | ## repo_utils.is_linuxrepo_utils.is_linux(rctx)Returns true if the host operating system is Linux **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx |
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| none | ## repo_utils.is_windowsrepo_utils.is_windows(rctx)Returns true if the host operating system is Windows **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx |
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| none | ## repo_utils.get_env_varrepo_utils.get_env_var(rctx, name, default)Find an environment variable in system. Doesn't %-escape the value! **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx | rctx | none | | name | environment variable name | none | | default | default value to return if env var is not set in system | none | **RETURNS** The environment variable value or the default if it is not set ## repo_utils.os
repo_utils.os(rctx)Returns the name of the host operating system **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx | rctx | none | **RETURNS** The string "windows", "linux", "freebsd" or "darwin" that describes the host os ## repo_utils.platform
repo_utils.platform(rctx)Returns a normalized name of the host os and CPU architecture. Alias archictures names are normalized: x86_64 => amd64 aarch64 => arm64 The result can be used to generate repository names for host toolchain repositories for toolchains that use these normalized names. Common os & architecture pairs that are returned are, - darwin_amd64 - darwin_arm64 - linux_amd64 - linux_arm64 - linux_s390x - linux_ppc64le - windows_amd64 **PARAMETERS** | Name | Description | Default Value | | :------------- | :------------- | :------------- | | rctx | rctx | none | **RETURNS** The normalized "