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在嵌入式设备上运行脚本时未绑定变量？

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在嵌入式设备上运行脚本时未绑定变量？

我有一个脚本在我的桌面上触发时，工作正常curl -sL https://sentry.io/get-cli/ | bash。

当我curl从嵌入式设备调用上面相同的命令时，我得到：

bash: line 22: !DOWNLOAD_URL_LOOKUP: unbound variable

为什么这种情况只发生在较旧的嵌入式设备上？（Ubuntu 14.04、GNU bash、版本 4.3.11(1)-release (arm-unknown-linux-gnueabihf)）

相关脚本：

#!/bin/bash
set -eu

SENTRY_DOWNLOAD_Darwin_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Darwin-x86_64"
SENTRY_DOWNLOAD_Linux_i686="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Linux-i686"
SENTRY_DOWNLOAD_Linux_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Linux-x86_64"
SENTRY_DOWNLOAD_Windows_i686="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Windows-i686.exe"
SENTRY_DOWNLOAD_Windows_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Windows-x86_64.exe"
VERSION="1.26.0"
PLATFORM=`uname -s`
ARCH=`uname -m`

# If the install directory is not set, set it to a default
if [ -z ${INSTALL_DIR+x} ]; then
  INSTALL_DIR=/usr/local/bin
fi
if [ -z ${INSTALL_PATH+x} ]; then
  INSTALL_PATH="${INSTALL_DIR}/sentry-cli"
fi

DOWNLOAD_URL_LOOKUP="SENTRY_DOWNLOAD_${PLATFORM}_${ARCH}"
DOWNLOAD_URL="${!DOWNLOAD_URL_LOOKUP}"

echo "This script will automatically install sentry-cli ${VERSION} for you."
echo "Installation path: ${INSTALL_PATH}"
if [ "x$(id -u)" == "x0" ]; then
  echo "Warning: this script is currently running as root. This is dangerous. "
  echo "         Instead run it as normal user. We will sudo as needed."
fi

if [ -f "$INSTALL_PATH" ]; then
  echo "error: sentry-cli is already installed."
  exit 1
fi

if [ x$DOWNLOAD_URL == x ]; then
  echo "error: your platform and architecture (${PLATFORM}-${ARCH}) is unsupported."
  exit 1
fi

if ! hash curl 2> /dev/null; then
  echo "error: you do not have 'curl' installed which is required for this script."
  exit 1
fi

TEMP_FILE=`mktemp "${TMPDIR:-/tmp}/.sentrycli.XXXXXXXX"`

cleanup() {
  rm -f "$TEMP_FILE"
}

trap cleanup EXIT
curl -SL --progress-bar "$DOWNLOAD_URL" > "$TEMP_FILE"
chmod 0755 "$TEMP_FILE"
if ! mv "$TEMP_FILE" "$INSTALL_PATH" 2> /dev/null; then
  sudo -k mv "$TEMP_FILE" "$INSTALL_PATH"
fi

echo 'Done!'

答案1

这里没有太多信息，但是您是否获取了变量？如果是这样，则尝试通过在set +u源文件之前调用来禁用源文件的变量严格性，然后立即启用它set -u

答案2

我想我明白发生了什么。DOWNLOAD_URL_LOOKUP被设置为SENTRY_DOWNLOAD_Linux_armv7l.

然后是行：

 DOWNLOAD_URL="${!DOWNLOAD_URL_LOOKUP}"

尝试DOWNLOAD_URL根据开始时设置的变量来映射：

SENTRY_DOWNLOAD_Darwin_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Darwin-x86_64"
SENTRY_DOWNLOAD_Linux_i686="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Linux-i686"
SENTRY_DOWNLOAD_Linux_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Linux-x86_64"
SENTRY_DOWNLOAD_Windows_i686="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Windows-i686.exe"
SENTRY_DOWNLOAD_Windows_x86_64="https://github.com/getsentry/sentry-cli/releases/download/1.26.0/sentry-cli-Windows-x86_64.exe"

由于这些不包括SENTRY_DOWNLOAD_Linux_armv7l返回错误。如果我为我的版本添加 url，脚本将运行：

SENTRY_DOWNLOAD_Linux_arm7l="https://google.com"

此外，似乎脚本对于这种情况有一条错误消息，但它set -u导致程序在引用未设置的变量时退出。

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