Finding the fastest mirror

After you install Alpine, you may be wondering how do I figure out the fastest mirror again?

Contents of /home/user/fastestmirror

data=""
for s in $(wget -qO- http://rsync.alpinelinux.org/alpine/MIRRORS.txt); do
        t=$(time -f "%E" wget -q $s/MIRRORS.txt -O /dev/null 2>&1)
        echo "$s was $t"
        data="$data$t $s\n"
done

echo "===RESULTS==="

echo -e $data | sort

This is more advanced implementation.

Contents of /etc/apk/fastest-mirror

#!/bin/sh
get_hostname_url() {
  local n=${1#*://}
  echo ${n%%/*}
}

time_cmd() {
  local proc=$(cut -d ' ' -f1 /proc/uptime)
  local start="$(echo $proc | cut -d . -f1)$(echo $proc | cut -d . -f2)"
  $@ >/dev/null 2>&1 || return
  proc=$(cut -d ' ' -f1 /proc/uptime)
  local end="$(echo $proc | cut -d . -f1)$(echo $proc | cut -d . -f2)" 
  echo $(( $end - $start  ))
}

DATA=""
MIRRORS=$(wget -qO- "http://rsync.alpinelinux.org/alpine/MIRRORS.txt")
DST=/etc/apk/mirrors.txt

#find best
for URL in $MIRRORS; do
	TIME=$(time_cmd wget -T 1 -q ${URL%/} -O /dev/null)
	if [ -n "$TIME" ]; then	
		echo "$(get_hostname_url $URL) was $TIME"
		DATA="$DATA$TIME $URL\n"
	fi
done


echo -e $DATA | sort -n | tail -n +2 > $DST
[ $? = 0 ] && echo file $DST created

BEST=$(head -n1 $DST | cut -d ' ' -f2)
echo "Best mirror is: $BEST"

sed -i -r 's#^http.+/(.+/main)#'${BEST%/}'/\1#' /etc/apk/repositories
sed -i -r 's#^http.+/(.+/community)#'${BEST%/}'/\1#' /etc/apk/repositories
sed -i -r 's#^http.+/(.+/testing)#'${BEST%/}'/\1#' /etc/apk/repositories