如何在yocto.bb配方中有条件地指定变量

我想这样做：

if [ "${BB_NO_NETWORK}" == "1" ]; then
    SRCREV ?= "a2d1f0225692c7c054014ec4dfc4dd13a35245ee"
else
    SRCREV ?= "${AUTOREV}"
fi

bb.data_smart.ExpansionError: Failure expanding variable SRCREV_v16, expression was ${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') } which triggered exception TypeError: getVar() missing 1 required positional argument: 'expand'

但我有一个未分析的错误

这是我的工作成果

SRCREV_FORMAT = "${@bb.utils.contains('BB_NO_NETWORK', '1', "v16_pcmx", "${AUTOREV}", d)}"
SRCREV_d3v16 = "${@bb.utils.contains('BB_NO_NETWORK', '1', "a2d1f0225692c7c054014ec4dfc4dd13a35245ee", "${AUTOREV}", d)}"
SRCREV_v16 = "${@bb.utils.contains('BB_NO_NETWORK', '1', "a2d1f0225692c7c054014ec4dfc4dd13a35245ee", "${AUTOREV}", d)}"
SRCREV_pcmx-native = "${@bb.utils.contains('BB_NO_NETWORK', '1', "d09e0b91ae34d807d3df27908f045e58a52e0c4c", "${AUTOREV}", d)}"
SRCREV_pcmx-pn-pcmx = "${@bb.utils.contains('BB_NO_NETWORK', '1', "d09e0b91ae34d807d3df27908f045e58a52e0c4c", "${AUTOREV}", d)}"
SRCREV_pcmx = "${@bb.utils.contains('BB_NO_NETWORK', '1', "d09e0b91ae34d807d3df27908f045e58a52e0c4c", "${AUTOREV}", d)}"
SRCREV_pn-pcmx = "${@bb.utils.contains('BB_NO_NETWORK', '1', "d09e0b91ae34d807d3df27908f045e58a52e0c4c", "${AUTOREV}", d)}"
SRCREV = "${@bb.utils.contains('BB_NO_NETWORK', '1', "", "${AUTOREV}", d)}"

此尝试失败：

SRCREV_FORMAT = "${@ "v16_pcmx" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_d3v16 = "${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_v16 = "${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_pcmx-native = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_pcmx-pn-pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV_pn-pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"
SRCREV = "${@ "" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK',TRUE)) else d.getVar('AUTOREV') }"

这也失败了

SRCREV_FORMAT = "${@ "v16_pcmx" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_d3v16 = "${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_v16 = "${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_pcmx-native = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_pcmx-pn-pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV_pn-pcmx = "${@ "d09e0b91ae34d807d3df27908f045e58a52e0c4c" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"
SRCREV = "${@ "" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') }"

此错误如下所示：

if [ "${BB_NO_NETWORK}" == "1" ]; then
    SRCREV ?= "a2d1f0225692c7c054014ec4dfc4dd13a35245ee"
else
    SRCREV ?= "${AUTOREV}"
fi

bb.data_smart.ExpansionError: Failure expanding variable SRCREV_v16, expression was ${@ "a2d1f0225692c7c054014ec4dfc4dd13a35245ee" if bb.utils.to_boolean(d.getVar('BB_NO_NETWORK')) else d.getVar('AUTOREV') } which triggered exception TypeError: getVar() missing 1 required positional argument: 'expand'

最后，这也是失败的：

SRCREV_FORMAT = "${@'v16_pcmx' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_d3v16 = "${@'a2d1f0225692c7c054014ec4dfc4dd13a35245ee' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_v16 = "${@'a2d1f0225692c7c054014ec4dfc4dd13a35245ee' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_pcmx-native = "${@'d09e0b91ae34d807d3df27908f045e58a52e0c4c' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_pcmx-pn-pcmx = "${@'d09e0b91ae34d807d3df27908f045e58a52e0c4c' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_pcmx = "${@'d09e0b91ae34d807d3df27908f045e58a52e0c4c' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV_pn-pcmx = "${@'d09e0b91ae34d807d3df27908f045e58a52e0c4c' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"
SRCREV = "${@'' if d.getVar('BB_NO_NETWORK') == '1' else '${AUTOREV}'}"

---

我猜在现代OE上会是这样（未经测试）：

---

使用。在较旧的OE上，您可能需要为

d.getVar

指定第二个参数，例如

d.getVar（'BB\u NO\u NETWORK'，True）

您还可以从

utils.bbclass

使用基本条件：

SRCREV = "${@base_conditional('BB_NO_NETWORK', '1', 'a2d1f0225692c7c054014ec4dfc4dd13a35245ee', '${AUTOREV}', d)}"

---

你建议的两种方法我都试过了。它们给出了不同的错误。我已经发布了到目前为止我所做的工作和我尝试过的失败的东西。啊，它确实有效。您需要提供的替代方法。不过我犯了个错误。我用的是TRUE而不是TRUE。它就像一个冠军。非常感谢。

base\u conditional

已替换为

oe.utils.conditional

，但语法相同。