syslogd: Re-write and simplify log rotate script

roles/syslogd/files/syslog-archive.sh

@@ -1,79 +1,30 @@
 #!/bin/sh
 
-LOGDIR="/srv/log"
-ARCHIVE="${LOGDIR}/archive"
-
-DATE="`date +%Y-%m-%d`"
-YEAR="`date +%Y`"
+set -eu
 
 umask 027
 
-myerror()
-{
-    echo "Error: $*" 1>&2
+_date="$(date +%Y-%m-%d)"
+_logfile="/srv/log/all.log"
+
+_archivedir="$(dirname "$_logfile")/archive/$(date +%Y)"
+
+if [ -f "$_logfile" ]; then
+    if [ ! -s "$_logfile" ]; then
+        echo "ERROR: Not rotating empty logfile '${_logfile}'" 1>&2
+        exit 1
+    fi
+else
+    echo "ERROR: Cannot find logfile '${_logfile}'" 1>&2
     exit 1
-}
+fi
 
-archive_log()
-{
-    FILE="${1}"
-    DEST="${2}"
+_dest="${_archivedir}/$(basename "$_logfile").${_date}"
+[ -d "$_archivedir" ] || mkdir "$_archivedir"
 
-    if [ -f "${DEST}" -o -f "${DEST}.gz" ]; then
-        echo "Skipping ${FILE}: Archive already exists" 1>&2
-    else
-        echo "Archiving file ${FILE} to ${DEST}"
-        mv "${FILE}" "${DEST}"
-        touch "${FILE}"
-        LOGS="${LOGS} ${DEST}"
-    fi
-}
+mv "$_logfile" "${_dest}"
+touch "$_logfile"
 
-restart_syslog()
-{
-    for i in syslog.pid rsyslogd.pid syslogd.pid ; do
-        if [ -f "/var/run/$i" ]; then
-            PIDFILE="/var/run/$i"
-            break
-        fi
-    done
-    if [ "blah${PIDFILE}" = "blah" ]; then
-        myerror "Cannot find syslog pid file"
-    fi
-    kill -HUP `cat ${PIDFILE}`
-}
+kill -HUP "$(cat /var/log/syslog.pid)"
 
-[ $# -gt 0 ] || myerror "Usage: `basename $0` <file|dir> [file|dir] ..."
-
-[ -d ${LOGDIR} ] || myerror "Not a directory: ${LOGDIR}"
-
-while [ "$*" ]; do
-    if [ -f "${LOGDIR}/${1}" ]; then
-        dstdir=${ARCHIVE}/${YEAR}
-        dstfile=${dstdir}/`basename ${1}`.${DATE}
-        [ -d "${dstdir}" ] || mkdir -p ${dstdir}
-        archive_log ${LOGDIR}/${1} ${dstfile}
-    elif [ -d "${LOGDIR}/${1}" ]; then
-        for f in ${LOGDIR}/${1}/*.log; do
-            if [ -f "${f}" ]; then
-                dstdir=${ARCHIVE}/${1}/${YEAR}
-                dstfile=${dstdir}/`basename ${f}`.${DATE}
-                [ -d "${dstdir}" ] || mkdir -p ${dstdir}
-                archive_log ${f} ${dstfile}
-            else
-                echo "Skipping ${f}: not a file" 1>&2
-            fi
-        done
-    else
-        echo "Skipping ${1}: not a file or directory" 1>&2
-    fi
-    shift
-done
-
-restart_syslog
-
-for log in ${LOGS}; do
-    gzip -f ${log} || myerror "Error while gzipping ${log}"
-    loggz="`basename ${log}`.gz"
-    ( cd `dirname ${log}` && openssl sha1 -out ${loggz}.sha1 ${loggz} )
-done
+nice gzip -f "$_dest"