Output Git information into JSON

git-info.sh

#!/bin/bash

# Function to escape JSON strings
escape_json() {
    echo "$1" | sed 's/\\/\\\\/g; s/"/\\"/g' | sed ':a;N;$!ba;s/\n/\\n/g'
}

# Get git information
BRANCH=$(git symbolic-ref HEAD 2>/dev/null | sed 's/refs\/heads\///' || echo "unknown")
COMMIT_ID=$(git rev-parse HEAD 2>/dev/null || echo "unknown")
COMMIT_USER_NAME=$(git log -1 --pretty=format:%an 2>/dev/null || echo "unknown")
COMMIT_USER_EMAIL=$(git log -1 --pretty=format:%ae 2>/dev/null || echo "unknown")
COMMIT_MESSAGE_FULL=$(git log -1 --pretty=format:%B 2>/dev/null || echo "unknown")
COMMIT_MESSAGE_SHORT=$(git log -1 --pretty=format:%s 2>/dev/null || echo "unknown")
COMMIT_TIMESTAMP=$(git log -1 --pretty=format:%ct 2>/dev/null || echo "0")

# Convert timestamp to readable format (matching Node.js Date.toString() format)
if [[ "$COMMIT_TIMESTAMP" != "0" ]]; then
    COMMIT_TIME=$(date -d "@$COMMIT_TIMESTAMP" 2>/dev/null || date -r "$COMMIT_TIMESTAMP" 2>/dev/null || echo "unknown")
else
    COMMIT_TIME="unknown"
fi

# Get abbreviated commit ID (first 7 characters)
if [[ "$COMMIT_ID" != "unknown" ]]; then
    ABBREV_ID="${COMMIT_ID:0:7}"
else
    ABBREV_ID="unknown"
fi

# Get build time in UTC format
BUILD_TIME=$(date -u '+%a, %d %b %Y %H:%M:%S GMT')

# Escape all values for JSON
BRANCH_ESC=$(escape_json "$BRANCH")
COMMIT_ID_ESC=$(escape_json "$COMMIT_ID")
ABBREV_ID_ESC=$(escape_json "$ABBREV_ID")
COMMIT_USER_NAME_ESC=$(escape_json "$COMMIT_USER_NAME")
COMMIT_USER_EMAIL_ESC=$(escape_json "$COMMIT_USER_EMAIL")
COMMIT_MESSAGE_FULL_ESC=$(escape_json "$COMMIT_MESSAGE_FULL")
COMMIT_MESSAGE_SHORT_ESC=$(escape_json "$COMMIT_MESSAGE_SHORT")
COMMIT_TIME_ESC=$(escape_json "$COMMIT_TIME")
BUILD_TIME_ESC=$(escape_json "$BUILD_TIME")

# Output JSON
cat << EOF
{
  "buildTime": "$BUILD_TIME_ESC",
  "git": {
    "commit": {
      "message": {
        "full": "$COMMIT_MESSAGE_FULL_ESC",
        "short": "$COMMIT_MESSAGE_SHORT_ESC"
      },
      "time": "$COMMIT_TIME_ESC",
      "id": "$COMMIT_ID_ESC",
      "abbrevId": "$ABBREV_ID_ESC",
      "user": {
        "email": "$COMMIT_USER_EMAIL_ESC",
        "name": "$COMMIT_USER_NAME_ESC"
      }
    },
    "branch": "$BRANCH_ESC"
  }
}
EOF