Yann Autissier
55fae625d6
Two mechanisms, matching what the make engine actually did:
Lazy defaults. A stack setting is a function myos_default_<VAR>, called only
when the variable has no value, and called again at every reference. That is
exactly a recursive ?=: an explicit value wins, and the default follows a
DOMAIN that a .env changes later. The prefix is what makes it safe; the first
version used a bare function named after the variable, and the test suite
caught it running /usr/bin/host for a stack group called host.
Templates. myos env-update fills a .env from the .env.dist files, expanding
${VAR} against the current values and running $(command), forward references
included.
Also fixed: the project .env now wins over /etc/conf.d/myos, which is what the
documentation claimed and the code did not.
share/make/shim.mk lets a project keep make as a front end: every myos command
becomes a target that shells out to bin/myos, and the project keeps its own
targets and its stack .mk files. It sits outside make/ because the legacy
engine globs every .mk in there.
74 lines
2.1 KiB
Bash
74 lines
2.1 KiB
Bash
#shellcheck shell=sh
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Include lib/core.sh
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Include lib/var.sh
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Describe 'lib/var.sh'
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Describe 'myos_var'
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It 'returns the value of a plain variable'
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SOME_VAR=plain
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When call myos_var SOME_VAR
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The output should equal "plain"
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End
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It 'returns empty for an unset variable'
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When call myos_var NEVER_SET
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The output should equal ""
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End
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It 'returns empty for an empty name'
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When call myos_var ""
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The output should equal ""
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End
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It 'never runs a command that happens to share the name'
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# `host` is a real program: a lazy default must never be confused with it
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When call myos_var host
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The output should equal ""
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The status should be success
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The stderr should equal ""
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End
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End
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Describe 'lazy defaults'
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lazy() {
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myos_default_LAZY_ONE() { printf 'from-%s' "$(myos_var LAZY_BASE)"; }
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myos_var LAZY_ONE
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}
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It 'computes the default when the variable has no value'
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LAZY_BASE=a
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When call lazy
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The output should equal "from-a"
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End
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It 'recomputes it against the current values'
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When run source spec/unit/var_lazy_helper.sh
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The line 1 should equal "from-first"
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The line 2 should equal "from-second"
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The line 3 should equal "pinned"
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End
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It 'declares a default from a string too'
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When run source spec/unit/var_default_helper.sh
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The output should equal "built-here"
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End
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It 'refuses a default written in terms of itself'
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When run source spec/unit/var_loop_helper.sh
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The stderr should include "defined in terms of itself"
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The status should equal 1
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End
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End
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Describe 'myos_var_is_lazy'
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It 'is true for a variable that only has a default'
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myos_default_ONLY_LAZY() { echo x; }
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When call myos_var_is_lazy ONLY_LAZY
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The status should be success
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End
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It 'is false once the variable has a value'
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myos_default_BOTH() { echo x; }
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BOTH=explicit
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When call myos_var_is_lazy BOTH
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The status should be failure
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End
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It 'is false for a program on PATH'
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When call myos_var_is_lazy host
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The status should be failure
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End
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End
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End
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