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Improve shell script robustness and error handling

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- Added `set -euo pipefail` to ensure the script exits on errors, undefined variables, or failed pipelines.
- Enhanced error handling for SSH agent start and key addition, with clear error messages.
- Replaced `echo` with `printf` for more reliable and formatted output.
- Introduced optional legacy RSA hostkey handling based on input parameters.
- Improved overall script readability with clearer variable names and structured conditionals.
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Nils 2024-08-22 20:44:37 +02:00 committed by GitHub
parent 796cf0d5e4
commit 434c50264b
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1 changed files with 27 additions and 11 deletions
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38
entrypoint.sh
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@ -1,25 +1,41 @@
#!/bin/sh
# Exit the script on any error, undefined variable, or in a pipeline.
set -euo pipefail
# Check if the remote path is empty.
if [ -z "$(echo "$INPUT_REMOTE_PATH" | awk '{$1=$1};1')" ]; then
echo "The remote_path can not be empty. see: github.com/Burnett01/rsync-deployments/issues/44"
printf "Error: The remote_path cannot be empty. See: github.com/Burnett01/rsync-deployments/issues/44\n"
exit 1
fi
# Start the SSH agent and load key.
source agent-start "$GITHUB_ACTION"
echo "$INPUT_REMOTE_KEY" | SSH_PASS="$INPUT_REMOTE_KEY_PASS" agent-add
# Start the SSH agent and load the key.
if ! source agent-start "$GITHUB_ACTION"; then
printf "Error: SSH agent could not be started.\n"
exit 1
fi
# Add strict errors.
set -eu
if ! echo "$INPUT_REMOTE_KEY" | SSH_PASS="$INPUT_REMOTE_KEY_PASS" agent-add; then
printf "Error: SSH key could not be added.\n"
exit 1
fi
# Variables.
LEGACY_RSA_HOSTKEYS="-o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedKeyTypes=+ssh-rsa"
LEGACY_RSA_HOSTKEYS=$([ "$INPUT_LEGACY_ALLOW_RSA_HOSTKEYS" = "true" ] && echo "$LEGACY_RSA_HOSTKEYS" || echo "")
# Optionally add Legacy RSA Hostkeys.
LEGACY_RSA_HOSTKEYS=""
if [ "$INPUT_LEGACY_ALLOW_RSA_HOSTKEYS" = "true" ]; then
LEGACY_RSA_HOSTKEYS="-o HostKeyAlgorithms=+ssh-rsa -o PubkeyAcceptedKeyTypes=+ssh-rsa"
fi
# Define variables.
SWITCHES="$INPUT_SWITCHES"
RSH="ssh -o StrictHostKeyChecking=no $LEGACY_RSA_HOSTKEYS -p $INPUT_REMOTE_PORT $INPUT_RSH"
LOCAL_PATH="$GITHUB_WORKSPACE/$INPUT_PATH"
DSN="$INPUT_REMOTE_USER@$INPUT_REMOTE_HOST"
# Deploy.
sh -c "rsync $SWITCHES -e '$RSH' $LOCAL_PATH $DSN:$INPUT_REMOTE_PATH"
# Perform deployment.
if ! sh -c "rsync $SWITCHES -e '$RSH' $LOCAL_PATH $DSN:$INPUT_REMOTE_PATH"; then
printf "Error: Deployment failed.\n"
exit 1
fi
printf "Deployment completed successfully.\n"