75 lines
2.3 KiB
Bash
75 lines
2.3 KiB
Bash
# Since the same derivation can be depend on in multiple ways, we need to
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# accumulate *each* role (i.e. host and target platforms relative the depending
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# derivation) in which the derivation is used.
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#
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# The role is intened to be use as part of other variables names like
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# - $NIX_${role_pre}_SOMETHING
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# - $NIX_SOMETHING_${role_post}
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function getRole() {
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case $1 in
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-1)
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role_pre='BUILD_'
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role_post='_FOR_BUILD'
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;;
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0)
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role_pre=''
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role_post=''
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;;
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1)
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role_pre='TARGET_'
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role_post='_FOR_TARGET'
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;;
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*)
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echo "@name@: used as improper sort of dependency" >2
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return 1
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;;
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esac
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}
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# `hostOffset` describes how the host platform of the package is slid relative
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# to the depending package. `targetOffset` likewise describes the target
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# platform of the package. Both are brought into scope of the setup hook defined
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# for dependency whose setup hook is being processed relative to the package
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# being built.
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function getHostRole() {
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getRole "$hostOffset"
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}
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function getTargetRole() {
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getRole "$targetOffset"
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}
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# `depHostOffset` describes how the host platform of the dependencies are slid
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# relative to the depending package. `depTargetOffset` likewise describes the
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# target platform of dependenices. Both are brought into scope of the
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# environment hook defined for the dependency being applied relative to the
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# package being built.
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function getHostRoleEnvHook() {
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getRole "$depHostOffset"
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}
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function getTargetRoleEnvHook() {
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getRole "$depTargetOffset"
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}
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# This variant is inteneded specifically for code-prodocing tool wrapper scripts
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# `NIX_@wrapperName@_@infixSalt@_TARGET_*` tracks this (needs to be an exported
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# env var so can't use fancier data structures).
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function getTargetRoleWrapper() {
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case $targetOffset in
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-1)
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export NIX_@wrapperName@_@infixSalt@_TARGET_BUILD=1
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;;
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0)
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export NIX_@wrapperName@_@infixSalt@_TARGET_HOST=1
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;;
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1)
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export NIX_@wrapperName@_@infixSalt@_TARGET_TARGET=1
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;;
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*)
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echo "@name@: used as improper sort of dependency" >2
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return 1
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;;
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esac
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}
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