add azbyka_update_fallback.sh (eterbug #11957)

web/azbyka_update_fallback.sh

+#!/bin/sh
+
+TEMPL=/etc/nginx/include/static-fallback.conf.TEMPLATE
+TARG=/etc/nginx/include/static-fallback-
+
+fatal()
+{
+    echo "Fatal: $@"
+    exit 1
+}
+
+# new file -> old file
+rewrite_if_changed()
+{
+        local NEWFILE="$1" OLDFILE="$2"
+        if [ -r $OLDFILE ] ; then
+                if diff -u $OLDFILE $NEWFILE ; then
+                        echo "$OLDFILE is not changed"
+                        rm -f $NEWFILE
+                else
+                        mv -f $NEWFILE $OLDFILE
+                fi
+        else
+                mv -f $NEWFILE $OLDFILE
+        fi
+}
+
+
+gen_static_fallback()
+{
+    local f="$1"
+    local of=$TARG$f.conf
+    local otf=$TARG$f.conf.tmp
+    echo
+    echo "generate $otf"
+    cat $TEMPL | sed -e "s|@fallback|@fallback-$f|g" >$otf
+    # TODO: merge with rewrite_if_changed
+    [ -r "$of" ] || { echo "there is no target $of file" ; return 1; }
+    [ -s "$otf" ] || { echo "empty generated file $otf" ; return 1; }
+    rewrite_if_changed "$otf" "$of"
+}
+
+if [ -n "$1" ] ; then
+    gen_static_fallback "${1/-manual/}"
+    exit
+fi
+
+grep "include/static-fallback-.*\.conf" /etc/nginx/sites-enabled.d/azbyka.d/*.conf | sed -e "s|:.*||g" | xargs -n1 -I"{}" basename "{}" .conf | sort -u | while read f ; do
+    gen_static_fallback "${f/-manual/}"
+    #exit
+done