mjhjmtu

I have a script that works fine normally, when triggered on my desktop curl -sL https://sentry.io/get-cli/ | bash.

When I call the same curl command above but from an embedded device I get:

bash: line 22: !DOWNLOAD_URL_LOOKUP: unbound variable

Why does this only happen on the older embedded device? (Ubuntu 14.04, GNU bash, version 4.3.11(1)-release (arm-unknown-linux-gnueabihf))

Related script:

#!/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!'

Not much info to go on here, but did you source the variables? If so, then try to disable variable strictness for the sourced file by calling set +u just before you source the file, then enable it immediately afterwords with set -u

I think I see what is happening. DOWNLOAD_URL_LOOKUP gets set to SENTRY_DOWNLOAD_Linux_armv7l.

Then the line:

 DOWNLOAD_URL="$!DOWNLOAD_URL_LOOKUP"

Tries to map the DOWNLOAD_URL based on the variables set at the start:

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"

As these don't include SENTRY_DOWNLOAD_Linux_armv7l the error is returned. If I add a url for my version the script runs:

SENTRY_DOWNLOAD_Linux_arm7l="https://google.com"

Also it seems the script had an error message for this situation but it set -u causing the program to exit when an unset variable was referenced.