nwjsmith · August 21, 2025 21:19 · Aug 21, 2025
diff --git a/colima-start.sh b/colima-start.sh
@@ -0,0 +1,89 @@
+#!/bin/bash
+
+usage() {
+    echo "Usage: $0 [PERCENT]"
+    echo "Start Colima with dynamically allocated memory and CPU"
+    echo ""
+    echo "Arguments:"
+    echo "  PERCENT    Percentage of system memory and CPU to allocate (default: 75)"
+    echo ""
+    echo "Examples:"
+    echo "  $0         # Use 75% of memory and CPU"
+    echo "  $0 50      # Use 50% of memory and CPU"
+    echo "  $0 90      # Use 90% of memory and CPU"
+    exit 1
+}
+
+validate_percent() {
+    local percent=$1
+    if ! [[ "${percent}" =~ ^[0-9]+$ ]] || [[ "${percent}" -lt 1 ]] || [[ "${percent}" -gt 100 ]]; then
+        echo "Error: Percent must be a number between 1 and 100" >&2
+        exit 1
+    fi
+}
+
+
+calculate_cpus() {
+    local percent=$1
+    local performance_cores
+    performance_cores=$(sysctl -n hw.perflevel0.physicalcpu 2>/dev/null || sysctl -n hw.ncpu)
+    local allocated_cpus=$((performance_cores * percent / 100))
+
+    if [[ "${allocated_cpus}" -lt 1 ]]; then
+        echo 1
+    else
+        echo "${allocated_cpus}"
+    fi
+}
+
+calculate_memory() {
+    local percent=$1
+    local memory_bytes
+    memory_bytes=$(sysctl -n hw.memsize)
+    local memory_gb=$((memory_bytes / 1024 / 1024 / 1024))
+    local allocated_memory=$((memory_gb * percent / 100))
+
+    if [[ "${allocated_memory}" -lt 4 ]]; then
+        echo 4
+    else
+        echo "${allocated_memory}"
+    fi
+}
+
+start_colima() {
+    local cpus=$1
+    local memory=$2
+
+    exec colima start \
+        --vm-type=vz \
+        --mount-type=virtiofs \
+        --cpu "${cpus}" \
+        --memory "${memory}"
+}
+
+main() {
+    local percent=75
+
+    if [[ $# -gt 1 ]]; then
+        echo "Error: Too many arguments" >&2
+        usage
+    fi
+
+    if [[ $# -eq 1 ]]; then
+        if [[ "$1" == "-h" ]] || [[ "$1" == "--help" ]]; then
+            usage
+        fi
+        percent="$1"
+    fi
+
+    validate_percent "${percent}"
+
+    local cpus
+    cpus=$(calculate_cpus "${percent}")
+    local memory
+    memory=$(calculate_memory "${percent}")
+
+    start_colima "${cpus}" "${memory}"
+}
+
+main "$@"