109 lines
2.1 KiB
Perl
109 lines
2.1 KiB
Perl
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Depending on a promoted file works.
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$ cat > dune-project <<EOF
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> (lang dune 2.0)
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> EOF
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$ cat > dune <<EOF
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> (rule
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> (mode promote)
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> (deps original)
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> (target promoted)
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> (action (copy %{deps} %{target})))
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> (rule
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> (deps promoted)
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> (target result)
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> (action (bash "cat promoted promoted > result")))
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> EOF
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$ echo hi > original
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$ dune build result
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$ cat promoted
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hi
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$ cat _build/default/result
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hi
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hi
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Now change the [original] and rebuild.
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$ echo bye > original
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$ dune build result
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$ cat promoted
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bye
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$ cat _build/default/result
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bye
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bye
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Now switch the mode to standard. Dune reports an error about multiple rules for
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[_build/default/promoted], as expected.
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$ cat > dune <<EOF
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> (rule
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> (mode standard)
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> (deps original)
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> (target promoted)
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> (action (copy %{deps} %{target})))
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> (rule
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> (deps promoted)
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> (target result)
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> (action (bash "cat promoted promoted > result")))
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> EOF
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$ dune build result
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Error: Multiple rules generated for _build/default/promoted:
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- dune:1
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- file present in source tree
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Hint: rm -f promoted
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[1]
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We use the hint and it starts to work.
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$ rm -f promoted
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$ dune build result
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$ cat promoted
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cat: promoted: No such file or directory
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[1]
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$ cat _build/default/promoted
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bye
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$ cat _build/default/result
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bye
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bye
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Now use [fallback] to override the rule that generates [promoted].
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$ cat > dune <<EOF
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> (rule
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> (mode fallback)
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> (deps original)
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> (target promoted)
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> (action (copy %{deps} %{target})))
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> (rule
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> (deps promoted)
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> (target result)
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> (action (bash "cat promoted promoted > result")))
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> EOF
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At first, we don't have the source, so the rule is used.
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$ dune build result
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$ cat promoted
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cat: promoted: No such file or directory
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[1]
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$ cat _build/default/promoted
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bye
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$ cat _build/default/result
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bye
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bye
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Now we create the source file and it overrides the rule.
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$ echo hi > promoted
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$ dune build result
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$ cat promoted
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hi
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$ cat _build/default/promoted
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hi
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$ cat _build/default/result
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hi
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hi
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