Useful script for showing status of data submodule

tools/git-submodule-status.sh

@@ -0,0 +1,90 @@
+#!/bin/bash
+
+# Tool for showing submodule history vs. associated and currently checked-out commits
+
+module="data"
+tail_count=5
+
+branch_name="$(git symbolic-ref HEAD 2>/dev/null)"
+
+if [ -z "$branch_name" ]; then
+    display_branch_name="(detached head)"
+else
+    display_branch_name="$branch_name"
+fi
+
+module_branch_name="$(cd $module && git symbolic-ref HEAD 2>/dev/null)"
+module_working_commit="$(cd $module && git rev-parse HEAD)"
+module_assoc_commit="$(git ls-tree $branch_name $module | awk '{print $3}' -)"
+
+if [ -z "$module_branch_name" ]; then
+    module_assoc_branches=($(cd $module && git branch --contains $module_assoc_commit | awk 'NR > 1 { print $1 }'))
+    if [ ${#module_assoc_branches[@]} -ne 1 ]; then
+        echo "$module module is in detached head, but referenced commit is in multiple branches"
+        echo "Sorry, can't help you"
+        exit 1
+    else
+        module_branch_name="${module_assoc_branches[0]}"
+        display_module_branch_name="(detached head, detected: $module_branch_name)"
+    fi
+else
+    display_module_branch_name="$module_branch_name"
+fi
+
+echo -e "Repository branch: \033[32m$display_branch_name\033[0m"
+echo -e "$module module branch: \033[32m$display_module_branch_name\033[0m"
+
+if [ -z "$(cd $module && git rev-list HEAD | grep $module_assoc_commit)" ]; then
+    echo -e "$module module associated commit: \033[33m$module_assoc_commit\033[0m is not in module history!"
+    echo "You probably have checked out different branch!"
+    exit 1
+fi
+
+echo ""
+
+i=0
+c=0
+h=1
+(cd $module && git log --format='%H%x01%h%x01%s%x00' $module_branch_name) | while read -d $'\0' info; do
+    commit=$(echo "$info" | cut -d$'\1' -f1)
+    short_commit=$(echo "$info" | cut -d$'\1' -f2)
+    message=$(echo "$info" | cut -d$'\1' -f3)
+
+    if [ $h -eq 1 ]; then
+        echo -n -e "\033[34m H \033[0m"
+    else
+        echo -n "   "
+    fi
+
+    h=0
+
+    if [ "$commit" == "$module_working_commit" ]; then
+        echo -n -e "\033[31m * \033[0m"
+        c=$(($c+1))
+    else
+        echo -n "   "
+    fi
+
+    if [ "$commit" == "$module_assoc_commit" ]; then
+        echo -n -e "\033[32m x \033[0m"
+        c=$(($c+1))
+    else
+        echo -n "   "
+    fi
+
+    echo -e "\033[33m$short_commit\033[0m $message"
+
+    if [ $c -eq 2 ]; then
+        i=$(($i+1))
+        if [ $i -gt $tail_count ]; then
+            echo "         ..."
+            break
+        fi
+    fi
+done
+
+echo ""
+echo -e "\033[34m H \033[0m -- $module_branch_name HEAD"
+echo -e "\033[31m * \033[0m -- checked-out commit"
+echo -e "\033[32m x \033[0m -- associated commit"
+