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use lock file to prevent concurrent access

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Closes #31.
This commit is contained in:
Simon Ruderich
2015-12-08 17:50:46 +01:00
parent 85da9090ef
commit f9126627a8
1 changed files with 19 additions and 0 deletions
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19
letsencrypt.sh
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@@ -306,6 +306,25 @@ sign_domain() {
echo " + Done!" echo " + Done!"
} }
LOCKFILE="${BASEDIR}/lock"
remove_lock() {
if [[ -n "${LOCKFILE}" ]]; then
rm -f "${LOCKFILE}"
fi
}
trap 'remove_lock' EXIT
# Use lock file to prevent concurrent access.
set -o noclobber
if ! { date > "${LOCKFILE}"; } 2>/dev/null; then
echo " + ERROR: Lock file '${LOCKFILE}' present, aborting." >&2
LOCKFILE= # so remove_lock doesn't remove it
exit 1
fi
set +o noclobber
# Get CA URLs # Get CA URLs
CA_DIRECTORY="$(_request get "${CA}")" CA_DIRECTORY="$(_request get "${CA}")"
CA_NEW_CERT="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value new-cert)" CA_NEW_CERT="$(printf "%s" "${CA_DIRECTORY}" | get_json_string_value new-cert)"