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- update_commit_dates.sh"
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‎update_commit_dates.sh‎

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#!/bin/bash
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# Script to update author and commit dates for Git commits
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# Sets dates to N days ago with random times from two periods: 5:00 AM - 8:00 AM or 10:00 PM - midnight
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# Each commit randomly chooses one of these two time periods
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#
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# Usage: ./update_commit_dates.sh [number_of_commits] [days_ago] [time_period]
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#
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# Examples:
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# ./update_commit_dates.sh # Uses defaults (3 commits, 1 day ago, evening period)
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# ./update_commit_dates.sh 30 # Changes the last 30 commits to 1 day ago, evening period
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# ./update_commit_dates.sh 10 7 # Changes the last 10 commits to 7 days ago, evening period
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# ./update_commit_dates.sh 10 7 morning # Uses morning period (5h-8h)
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# ./update_commit_dates.sh 10 7 evening # Uses evening period (22h-midnight)
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# ./update_commit_dates.sh 10 7 both # Randomly chooses between both periods
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# Default values
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DEFAULT_NUM_COMMITS=3
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DEFAULT_DAYS_AGO=1
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DEFAULT_TIME_PERIOD="evening"
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# Check for unstaged changes
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if [[ -n $(git status --porcelain) ]]; then
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echo "Error: You have unstaged changes in your working directory."
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echo "Please commit or stash your changes before running this script."
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exit 1
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fi
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# Parse command line arguments
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if [ $# -eq 0 ]; then
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NUM_COMMITS=$DEFAULT_NUM_COMMITS
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DAYS_AGO=$DEFAULT_DAYS_AGO
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TIME_PERIOD=$DEFAULT_TIME_PERIOD
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echo "No arguments provided. Using defaults: $NUM_COMMITS commits, $DAYS_AGO day(s) ago, $TIME_PERIOD period."
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elif [ $# -eq 1 ]; then
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# Validate that the argument is a positive integer
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if [[ $1 =~ ^[0-9]+$ ]] && [ $1 -gt 0 ]; then
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NUM_COMMITS=$1
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DAYS_AGO=$DEFAULT_DAYS_AGO
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TIME_PERIOD=$DEFAULT_TIME_PERIOD
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echo "Will modify the last $NUM_COMMITS commits to $DAYS_AGO day(s) ago using $TIME_PERIOD period."
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else
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echo "Error: First argument must be a positive integer."
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echo "Usage: $0 [number_of_commits] [days_ago] [time_period]"
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exit 1
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fi
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elif [ $# -eq 2 ]; then
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# Validate both arguments are positive integers
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if [[ $1 =~ ^[0-9]+$ ]] && [ $1 -gt 0 ] && [[ $2 =~ ^[0-9]+$ ]] && [ $2 -gt 0 ]; then
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NUM_COMMITS=$1
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DAYS_AGO=$2
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TIME_PERIOD=$DEFAULT_TIME_PERIOD
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echo "Will modify the last $NUM_COMMITS commits to $DAYS_AGO day(s) ago using $TIME_PERIOD period."
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else
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echo "Error: Both arguments must be positive integers."
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echo "Usage: $0 [number_of_commits] [days_ago] [time_period]"
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exit 1
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fi
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elif [ $# -eq 3 ]; then
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# Validate first two arguments are positive integers and third is valid time period
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if [[ $1 =~ ^[0-9]+$ ]] && [ $1 -gt 0 ] && [[ $2 =~ ^[0-9]+$ ]] && [ $2 -gt 0 ]; then
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if [[ $3 == "morning" || $3 == "evening" || $3 == "both" ]]; then
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NUM_COMMITS=$1
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DAYS_AGO=$2
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TIME_PERIOD=$3
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echo "Will modify the last $NUM_COMMITS commits to $DAYS_AGO day(s) ago using $TIME_PERIOD period."
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else
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echo "Error: Third argument must be 'morning', 'evening', or 'both'."
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echo "Usage: $0 [number_of_commits] [days_ago] [time_period]"
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exit 1
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fi
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else
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echo "Error: First two arguments must be positive integers."
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echo "Usage: $0 [number_of_commits] [days_ago] [time_period]"
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exit 1
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fi
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else
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echo "Error: Too many arguments."
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echo "Usage: $0 [number_of_commits] [days_ago] [time_period]"
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exit 1
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fi
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# Get the target date in YYYY-MM-DD format
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# Check if we're on macOS or Linux
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if [[ "$(uname)" == "Darwin" ]]; then
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# macOS date command
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TARGET_DATE=$(date -v-${DAYS_AGO}d "+%Y-%m-%d")
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else
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# Linux date command
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TARGET_DATE=$(date -d "${DAYS_AGO} days ago" "+%Y-%m-%d")
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fi
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# Get current branch name
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CURRENT_BRANCH=$(git symbolic-ref --short HEAD)
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BACKUP_BRANCH="${CURRENT_BRANCH}_backup_$(date +%Y%m%d%H%M%S)"
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echo "Setting commit dates to $DAYS_AGO day(s) ago ($TARGET_DATE) with random times:"
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if [ "$TIME_PERIOD" == "morning" ]; then
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echo " - Between 5:00 AM and 8:00 AM"
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elif [ "$TIME_PERIOD" == "evening" ]; then
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echo " - Between 10:00 PM and midnight"
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else
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echo " - Between 5:00 AM and 8:00 AM"
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echo " - Between 10:00 PM and midnight"
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echo "Each commit will randomly choose one of these two time periods"
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fi
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echo "This will modify the last $NUM_COMMITS commits."
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echo "WARNING: This operation rewrites Git history and is destructive."
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echo "If you've already pushed these commits, you'll need to force push after this operation."
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echo "This may cause problems for other collaborators who have pulled these commits."
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echo "A backup branch named '$BACKUP_BRANCH' will be created."
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echo "Press Ctrl+C to cancel or Enter to continue..."
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read
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# Create backup branch
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echo "Creating backup branch '$BACKUP_BRANCH'..."
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git branch $BACKUP_BRANCH
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# Get the SHA of the commit before our target range
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LAST_COMMIT=$(git rev-parse HEAD~$NUM_COMMITS)
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# Get the list of commits to modify in reverse order (oldest first)
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COMMITS=$(git rev-list --reverse $LAST_COMMIT..HEAD)
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# Create a temporary file to store the filter script
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FILTER_SCRIPT=$(mktemp)
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# Start building the filter script
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echo '#!/bin/bash' > $FILTER_SCRIPT
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echo '' >> $FILTER_SCRIPT
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# Process each commit
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for COMMIT in $COMMITS; do
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# Generate random time based on selected time period
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if [ "$TIME_PERIOD" == "morning" ]; then
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# Morning period: 5:00 AM - 8:00 AM (hours 5-7)
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RANDOM_HOUR=$((RANDOM % 3 + 5)) # Hours 5, 6, 7
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elif [ "$TIME_PERIOD" == "evening" ]; then
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# Evening period: 10:00 PM - midnight (hours 22-23)
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RANDOM_HOUR=$((RANDOM % 2 + 22)) # Hours 22, 23
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else
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# Both periods: randomly choose between morning and evening
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if [ $((RANDOM % 2)) -eq 0 ]; then
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# Morning period: 5:00 AM - 8:00 AM
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RANDOM_HOUR=$((RANDOM % 3 + 5)) # Hours 5, 6, 7
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else
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# Evening period: 10:00 PM - midnight
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RANDOM_HOUR=$((RANDOM % 2 + 22)) # Hours 22, 23
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fi
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fi
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# Generate random minutes and seconds
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RANDOM_MINUTE=$((RANDOM % 60))
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RANDOM_SECOND=$((RANDOM % 60))
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# Format the random time as HH:MM:SS
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RANDOM_TIME=$(printf "%02d:%02d:%02d" $RANDOM_HOUR $RANDOM_MINUTE $RANDOM_SECOND)
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COMMIT_DATE="${TARGET_DATE}T${RANDOM_TIME}"
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# Add this commit to the filter script
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echo "if [ \$GIT_COMMIT = '$COMMIT' ]; then" >> $FILTER_SCRIPT
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echo " export GIT_AUTHOR_DATE=\"$COMMIT_DATE\"" >> $FILTER_SCRIPT
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echo " export GIT_COMMITTER_DATE=\"$COMMIT_DATE\"" >> $FILTER_SCRIPT
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echo "fi" >> $FILTER_SCRIPT
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echo "" >> $FILTER_SCRIPT
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echo "Will set commit $COMMIT to $COMMIT_DATE"
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done
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# Make the filter script executable
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chmod +x $FILTER_SCRIPT
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# Run git filter-branch with the filter script
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echo "Rewriting commit dates..."
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git filter-branch -f --env-filter "source $FILTER_SCRIPT" $LAST_COMMIT..HEAD
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# Remove the temporary filter script
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rm $FILTER_SCRIPT
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echo -n "Done! The last $NUM_COMMITS commits now have their dates set to $DAYS_AGO day(s) ago with random times "
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if [ "$TIME_PERIOD" == "morning" ]; then
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echo "between 5:00 AM - 8:00 AM."
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elif [ "$TIME_PERIOD" == "evening" ]; then
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echo "between 10:00 PM - midnight."
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else
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echo "from two periods: 5:00 AM - 8:00 AM or 10:00 PM - midnight."
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fi
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echo "A backup of the original state was created in branch: $BACKUP_BRANCH"
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echo ""
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echo "To push these changes to the remote repository, use: git push --force"
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echo "To restore the original state, use: git reset --hard $BACKUP_BRANCH"

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