k8s-get-dotnet-version-from-deployments.sh

#!/bin/bash

NS=$1; 

if [ -z "$NS" ]
then
    echo "Usage: $0 namespace" >&2
    exit 1;
fi

for APP in $(kubectl -n $NS get deployment \
    -o jsonpath="{range .items[*]}{.metadata.labels.app}{'\n'}{end}" | grep -v 'eph-pr')
do
    POD=$(kubectl -n $NS get pod -l app=$APP \
     -o jsonpath="{range .items[*]}{.metadata.name} {.status.containerStatuses[0].ready}{'\n'}{end}" \
     | egrep ' true$' | sed 's/ true$//' | head -1)
    
    VERSION='deployment has no ready pods'

    [ -z "$POD" ] || VERSION=$(kubectl -n $NS exec $POD -- sh -c '
        dotnet --info 2> /dev/null || dotnet 2> /dev/null
        if [ "$?" -eq 127 ] # command not found
        then
            echo "Version: -1" # dotnet command not found (not a dotnet container)
        fi        
        exit 0
    ' 2> /dev/null | grep -oP "^\s*Version\s*:\s*\K[0-9.-]+" )
    
    [ -z "$POD" ] && POD="n/a"
    [ -z "$VERSION" ] && VERSION="container error (POD: $POD)"

    if [ "$VERSION" != "-1" ] # print only dotnet containers
    then
        printf "%-40s %s\n" "$APP" "$VERSION" 
    fi
done