Further development into CIS (core infrastructure system)

prepareThisHostBeforeCloning.sh

@@ -0,0 +1,73 @@
+#!/bin/bash
+
+[ "$(id -u)" != "0" ] \
+    && echo "This script prepares the user 'root' of this host and the host itself," \
+    && echo "so this script is allowed to be executed if you are root only." \
+    && exit 1
+
+function setNeededHostnameOrExit() {
+    _FQDN="${1:?"Missing unique long hostname (fqdn, eg.: host1.example.net) for this host as first parameter."}"
+
+    echo "${_FQDN}" | grep -F '.' &> /dev/null \
+        && hostnamectl set-hostname "${_FQDN}" \
+        && return 0
+
+    echo "FAILED: setting full qualified domain name does not contain a domain,"
+    echo "        given value was: ${_FQDN}"
+    exit 1
+}
+
+function prepareThisHost() {
+    git --version > /dev/null || (apt update; apt upgrade -y; apt install git)
+
+    echo
+    echo "Public SSH-Key for root@$(hostname -b):"
+    cat "/root/.ssh/id_ed25519.pub" \
+        && return 0
+
+    # -t    type of the key pair
+    # -f    defines the filenames (we use the standard for the selected type here)
+    # -q    quiet, no output or interaction
+    # -N "" means the private key will not be secured by a passphrase
+    # -C    defines a comment
+    ssh-keygen \
+        -t ed25519 \
+        -f "/root/.ssh/id_ed25519" -q -N "" \
+        -C "$(date +%Y%m%d)-root@$(hostname -b)"
+
+    cat "/root/.ssh/id_ed25519.pub" \
+        && return 0
+
+    echo
+    echo "FAILED: somthing went wrong during the generation the ssh keys."
+    echo "        These keys are mandantory. You can try to restart this script."
+    echo
+}
+
+function showFurtherSteps() {}
+    echo
+    echo "IMPORTANT: It is assumed that repositories for definitions and states already exist"
+    echo "           and comply with the naming convention."
+    echo "  Otherwise, these repositories must be created first!"
+    echo
+    echo "To grant the correct access rights, you have to register the above-mentioned ssh key,"
+    echo "as deploy key in these repositories of the Git server:"
+    echo "  - scripts repository     (allow readonly access only),"
+    echo "  - definitions repository (allow readonly access only),"
+    echo "  - states repository      (allow writable access)."
+    echo
+    echo "After all access rights are granted you can clone the Core Infrastructure System:"
+    echo "  e.g.: git clone ssh://git@git.example.dev:22448/cis.git /cis"
+    echo
+    echo "Finally call 'setupCoreOntoThisHost.sh' from the root directory:"
+    echo "  e.g.: /cis/setupCoreOntoThisHost.sh"
+    echo
+}
+
+# sanitizes all parameters
+setNeededHostnameOrExit "$(echo ${1} | sed -E 's|[^a-zA-Z0-9/:@._-]*||g')" \
+    && prepareThisHost \
+    && showFurtherSteps \
+    && exit 0
+
+exit 1