tidying

[exim.git] / src / util / renew-opendmarc-tlds.sh

diff --git a/src/util/renew-opendmarc-tlds.sh b/src/util/renew-opendmarc-tlds.sh
index c276fcd5fa970a084ad4fe35cd3b7b9a280dac70..d626aac37efcaa5758cc24439d3fc1237568cf9d 100755 (executable)
--- a/src/util/renew-opendmarc-tlds.sh
+++ b/src/util/renew-opendmarc-tlds.sh
@@ -1,4 +1,6 @@
 #!/bin/sh -eu
+# Copyright (c) The Exim Maintainers 2022
+# SPDX-License-Identifier: GPL-2.0-or-later
 #
 # Short version of this script:
 #   curl -f -o /var/cache/exim/opendmarc.tlds https://publicsuffix.org/list/public_suffix_list.dat
@@ -13,7 +15,7 @@
 # Create a cron-job as the Exim run-time user to invoke this daily, with a
 # single parameter, 'cron'.  Eg:
 #
-#    3 4 * * *    /usr/local/sbin/renew-opendmarc-tlds.sh cron
+#    3 4 * * *   /usr/local/sbin/renew-opendmarc-tlds.sh cron
 #
 # That will, at 3 minutes past the 4th hour (in whatever timezone cron is
 # running it) invoke this script with 'cron'; we will then sleep between 10 and
@@ -24,7 +26,8 @@
 # This should be "pretty portable"; the only things it depends upon are:
 #  * a POSIX shell which additionally implements 'local' (dash works)
 #  * the 'curl' command; change the fetch_candidate() function to replace that
-#  * the 'stat' command, to get the size of a file; change size_of() if need be
+#  * the 'stat' command, to get the size of a file; else Perl
+#    + change size_of() if need be; it's defined per-OS
 #  * the 'hexdump' command and /dev/urandom existing
 #    + used when invoked with 'cron', to avoid retrieving on a minute boundary
 #      and contending with many other automated systems.
@@ -77,9 +80,19 @@ fetch_candidate() {
        curl --user-agent "$CurlUserAgent" -fSs -o "${WorkingFile}" "${URL}"
 }
 
-size_of() {
-       stat -c %s "$1"
-}
+case $(uname -s) in
+*BSD|Darwin)
+       size_of() { stat -f %z "$1"; }
+       ;;
+Linux)
+       size_of() { stat -c %s "$1"; }
+       ;;
+*)
+       # why do we live in a world where Perl is the safe portable solution
+       # to getting the size of a file?
+       size_of() { perl -le 'print((stat($ARGV[0]))[7])' -- "$1"; }
+       ;;
+esac
 
 sanity_check_candidate() {
        local new_size prev_size re