latest

README.md

@@ -0,0 +1,23 @@
+# ubuntu geoip mirror selector
+
+Add to `Dockerfile`:
+
+```
+RUN apt-get update && apt-get install -y curl jq bash
+RUN curl -fsSL https://git.eeqj.de/sneak/ubuntulocal/raw/branch/main/updatemirror.sh | bash
+```
+
+Alternately, paste in:
+
+```
+apt-get update && apt-get install -y curl jq bash
+curl -fsSL https://git.eeqj.de/sneak/ubuntulocal/raw/branch/main/updatemirror.sh | bash
+```
+
+# License
+
+WTFPL
+
+# Author
+
+sneak `[sneak@sneak.berlin](mailto:sneak@sneak.berlin)`

updatemirror.sh

@@ -2,6 +2,14 @@
 
 set -euo pipefail
 
+function apt_update_if_stale () {
+    if ! find /var/lib/apt/lists -type f -mmin -30 | grep -q .; then
+        apt-get update
+    else
+        echo "Skipping apt update, metadata is fresh." > /dev/stderr
+    fi
+}
+
 function main () {
     # check for ubuntu only
     if ! grep -qi '^ID=ubuntu' /etc/os-release; then
@@ -16,33 +24,43 @@ function main () {
     fi
 
     if ! grep -qE 'http(s)?://archive\.ubuntu\.com/' /etc/apt/sources.list.d/*; then
-        echo "Not using default ubuntu repo, script will not function" > /dev/stderr
+        echo "Not using default ubuntu repo, nothing for us to change. Exiting." > /dev/stderr
         exit 1
     fi
 
+    apt_update_if_stale
+    if ! which jq > /dev/null; then
+        apt-get install -y jq
+    fi
+
+    if ! which curl > /dev/null; then
+        apt-get install -y curl
+    fi
+
     echo "Changing mirror country to US as a first approximation..." > /dev/stderr
-
     find /etc/apt/sources.list.d/ -type f -exec \
-      sed -i "s|archive\.ubuntu\.com|us.ubuntu.com|g" {} +
+      sed -i "s|archive\.ubuntu\.com|us.archive.ubuntu.com|g" {} +
 
     echo "Detecting actual country..." > /dev/stderr
 
-    apt update && apt install -y curl jq
     IPINFO="$(curl -s ipinfo.io)"
+
     if [ -z "$IPINFO" ]; then
-        echo "Failed to get IP info" > /dev/stderr
+        echo "Failed to geolocate (fetch).  Exiting." > /dev/stderr
         exit 1
     fi
+
     COUNTRYCODE="$(jq .country -r <<< "$IPINFO")"
+
+    if [[ -z "$COUNTRYCODE" ]]; then
+        echo "Failed to geolocate (parse).  Exiting." > /dev/stderr
+        exit 1
+    fi
+
     echo "IP geolocated as country: $COUNTRYCODE" > /dev/stderr
 
-    if ! grep -qE 'http(s)?://us\.archive\.ubuntu\.com/' /etc/apt/sources.list.d/*; then
-        echo "Not using default ubuntu repo, script will not function" > /dev/stderr
-        exit 1
-    fi
-
     if [[ "$COUNTRYCODE" == "US" ]]; then
-        echo "Mirror already set to  US, nothing to do" > /dev/stderr
+        echo "Mirror was already set to US, nothing to do.  Exiting." > /dev/stderr
         exit 0
     fi
 
@@ -52,6 +70,12 @@ function main () {
 
     find /etc/apt/sources.list.d/ -type f -exec \
       sed -i "s|us\.archive\.ubuntu\.com|$MIRRORHOST|g" {} +
+
+    # update is actually mandatory after changing the mirror:
+    apt-get update
+
+    echo "Finished." > /dev/stderr
+
     exit 0
 }