improved tag script

Author: htemelski-oss

scripts/tag.sh

@@ -2,14 +2,32 @@
 
 set -e
 
+DRY_RUN=1
+
+while getopts "t" opt; do
+    case $opt in
+        t)
+            DRY_RUN=0
+            ;;
+        \?)
+            echo "Invalid option: -$OPTARG" >&2
+            exit 1
+            ;;
+    esac
+done
+
 help() {
     cat <<- EOF
-Usage: TAG=tag $0
+Usage: TAG=tag $0 [-t]
 
 Creates git tags for public Go packages.
+The default behaviour is a dry-run.
 
 VARIABLES:
   TAG        git tag, for example, v1.0.0
+
+OPTIONS:
+  -t        Tag mode - executes git commands
 EOF
     exit 0
 }
@@ -31,12 +49,21 @@ PACKAGE_DIRS=$(find . -mindepth 2 -type f -name 'go.mod' -exec dirname {} \; \
   | sed 's/^\.\///' \
   | sort)
 
-git tag ${TAG}
-git push origin ${TAG}
+
+execute_git_command() {
+    if [ "$DRY_RUN" -eq 0 ]; then
+        "$@"
+    else
+        echo "DRY-RUN: Would execute: $@"
+    fi
+}
+
+execute_git_command git tag ${TAG}
+execute_git_command git push origin ${TAG}
 
 for dir in $PACKAGE_DIRS
 do
     printf "tagging ${dir}/${TAG}\n"
-    git tag ${dir}/${TAG}
-    git push origin ${dir}/${TAG}
+    execute_git_command git tag ${dir}/${TAG}
+    execute_git_command git push origin ${dir}/${TAG}
 done