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docker-mailserver/target/bin/sedfile
2022-01-08 00:25:09 +01:00

47 lines
1.1 KiB
Bash
Executable File

#!/bin/bash
# Wrapper for 'sed -i': fail if file was not modified by sed and container was not restarted.
# Error output is surpressed, when container is restarted to avoid harmless error messages.
# Use "--strict" as first parameter, to fail regardless of the container state (fresh or restarted).
# When to use sedfile?
# Is a file change optional? --> use regular 'sed -i'
# Is a file change expected? --> use 'sedfile --strict -i'
# Is a file change only on the first container run expected? --> use 'sedfile -i'
set -ueo pipefail
HASHTOOL="sha1sum"
SKIP_ERROR=0
if [[ $# -lt 3 ]]
then
echo "Error: At least, three parameters must be given."
echo "Syntax: sedfile -i <replace/delete operation> <file>"
echo
exit 1
fi >&2
[[ -f /CONTAINER_START ]] && SKIP_ERROR=1 # Hide error, if container was restarted.
if [[ "${1}" == "--strict" ]] # Show error every time.
then
SKIP_ERROR=0
shift
fi
# get last argument
FILE=${*: -1}
OLD=$(${HASHTOOL} "${FILE}")
sed "$@"
NEW=$(${HASHTOOL} "${FILE}")
# fail if file was not modified
if [[ ${OLD} == "${NEW}" ]] && [[ ${SKIP_ERROR} -eq 0 ]]
then
echo "Error: sed $*"
exit 1
fi >&2
exit 0