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Tykayn
tykayn
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find_largest_commit.sh
Executable file
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find_largest_commit.sh
Executable file
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#!/bin/bash
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# Script to find which commit made the biggest change in repository size
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#
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# This script analyzes git commit history to determine which commit caused
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# the largest change in the repository's size. It checks out each commit,
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# measures the repository size, and identifies the commit with the biggest
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# size difference.
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#
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# Usage: ./find_largest_commit.sh [number_of_commits_to_check]
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#
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# Arguments:
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# number_of_commits_to_check: Optional. Number of recent commits to analyze.
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# Defaults to 100 if not specified.
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#
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# Output:
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# - Detailed information about the commit with the largest size change
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# - A CSV file with data for all analyzed commits
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#
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# Requirements:
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# - git
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# - bc (for floating-point calculations)
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# - du (for measuring directory sizes)
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#
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# Author: Junie (JetBrains AI)
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# Date: 2025-08-31
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# Exit on error
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set -e
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# Trap for cleanup in case of unexpected exit
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trap cleanup EXIT
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cleanup() {
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# Make sure we return to the original branch
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if [ -n "$CURRENT_BRANCH" ]; then
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git checkout -q "$CURRENT_BRANCH" 2>/dev/null || true
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# Restore stashed changes if needed
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if [ "$STASH_NEEDED" = true ]; then
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echo "Restoring stashed changes..."
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git stash pop -q 2>/dev/null || true
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fi
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fi
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}
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# Default to checking the last 100 commits if not specified
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NUM_COMMITS=${1:-100}
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# Validate input
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if ! [[ "$NUM_COMMITS" =~ ^[0-9]+$ ]]; then
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echo "Error: Number of commits must be a positive integer."
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echo "Usage: $0 [number_of_commits_to_check]"
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exit 1
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fi
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if [ "$NUM_COMMITS" -lt 1 ]; then
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echo "Error: Number of commits must be at least 1."
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echo "Usage: $0 [number_of_commits_to_check]"
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exit 1
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fi
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echo "Analyzing the last $NUM_COMMITS commits to find the largest size change..."
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echo "This may take some time depending on repository size and history."
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echo
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# Get the list of commit hashes
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COMMITS=$(git log --pretty=format:"%H" -n "$NUM_COMMITS")
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# Initialize variables to track the largest change
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LARGEST_CHANGE=0
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LARGEST_COMMIT=""
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LARGEST_SIZE_BEFORE=0
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LARGEST_SIZE_AFTER=0
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# Function to get repository size at a specific commit
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get_repo_size() {
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local commit=$1
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# Checkout the commit
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git checkout -q "$commit"
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# Calculate size in bytes (excluding .git directory)
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local size=$(du -sb --exclude=.git . | cut -f1)
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echo "$size"
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}
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# Store current branch to return to it later
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CURRENT_BRANCH=$(git rev-parse --abbrev-ref HEAD)
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# Check if there are uncommitted changes
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if [[ -n $(git status -s) ]]; then
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echo "Stashing uncommitted changes before proceeding..."
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STASH_NEEDED=true
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git stash push -m "Temporary stash by find_largest_commit.sh script"
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else
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STASH_NEEDED=false
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fi
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# Temporary file to store results
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TEMP_FILE=$(mktemp)
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echo "Commit Hash,Author,Date,Size Before (bytes),Size After (bytes),Change (bytes),Change (%),Message" > "$TEMP_FILE"
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# Counter for progress display
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COUNTER=0
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TOTAL_COMMITS=$(echo "$COMMITS" | wc -l)
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# Process each commit
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PREV_SIZE=""
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for COMMIT in $COMMITS; do
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COUNTER=$((COUNTER + 1))
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echo -ne "Processing commit $COUNTER/$TOTAL_COMMITS...\r"
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# Get commit details
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AUTHOR=$(git show -s --format="%an" "$COMMIT")
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DATE=$(git show -s --format="%cd" --date=format:"%Y-%m-%d %H:%M:%S" "$COMMIT")
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MESSAGE=$(git show -s --format="%s" "$COMMIT" | sed 's/,/;/g') # Replace commas with semicolons
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# Get size after this commit
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SIZE_AFTER=$(get_repo_size "$COMMIT")
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# If this is the first commit we're checking, we don't have a previous size
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if [ -z "$PREV_SIZE" ]; then
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PREV_SIZE="$SIZE_AFTER"
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continue
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fi
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# Calculate size before (which is the size after the previous commit)
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SIZE_BEFORE="$PREV_SIZE"
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PREV_SIZE="$SIZE_AFTER"
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# Calculate change
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CHANGE=$((SIZE_AFTER - SIZE_BEFORE))
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ABS_CHANGE=${CHANGE#-} # Absolute value
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# Calculate percentage change
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if [ "$SIZE_BEFORE" -ne 0 ]; then
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PERCENT_CHANGE=$(echo "scale=2; 100 * $CHANGE / $SIZE_BEFORE" | bc)
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else
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PERCENT_CHANGE="N/A"
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fi
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# Record the data
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echo "$COMMIT,$AUTHOR,$DATE,$SIZE_BEFORE,$SIZE_AFTER,$CHANGE,$PERCENT_CHANGE%,$MESSAGE" >> "$TEMP_FILE"
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# Check if this is the largest change so far
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if [ "$ABS_CHANGE" -gt "$LARGEST_CHANGE" ]; then
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LARGEST_CHANGE="$ABS_CHANGE"
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LARGEST_COMMIT="$COMMIT"
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LARGEST_SIZE_BEFORE="$SIZE_BEFORE"
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LARGEST_SIZE_AFTER="$SIZE_AFTER"
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fi
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done
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# Return to the original branch
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# (Cleanup function will handle restoring stashed changes)
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git checkout -q "$CURRENT_BRANCH"
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echo -e "\nAnalysis complete!"
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# Function to format size in human-readable format
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format_size() {
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local size=$1
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if [ "$size" -ge 1073741824 ]; then
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echo "$(echo "scale=2; $size / 1073741824" | bc) GB"
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elif [ "$size" -ge 1048576 ]; then
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echo "$(echo "scale=2; $size / 1048576" | bc) MB"
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elif [ "$size" -ge 1024 ]; then
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echo "$(echo "scale=2; $size / 1024" | bc) KB"
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else
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echo "$size bytes"
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fi
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}
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# Display the result
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if [ -n "$LARGEST_COMMIT" ]; then
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echo
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echo "Commit with the largest size change:"
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echo "-----------------------------------"
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echo "Commit: $LARGEST_COMMIT"
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echo "Author: $(git show -s --format="%an" "$LARGEST_COMMIT")"
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echo "Date: $(git show -s --format="%cd" --date=format:"%Y-%m-%d %H:%M:%S" "$LARGEST_COMMIT")"
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echo "Message: $(git show -s --format="%s" "$LARGEST_COMMIT")"
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echo
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echo "Size before: $(format_size "$LARGEST_SIZE_BEFORE")"
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echo "Size after: $(format_size "$LARGEST_SIZE_AFTER")"
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CHANGE=$((LARGEST_SIZE_AFTER - LARGEST_SIZE_BEFORE))
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if [ "$CHANGE" -ge 0 ]; then
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echo "Change: +$(format_size "${CHANGE#-}") (increased)"
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else
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echo "Change: -$(format_size "${CHANGE#-}") (decreased)"
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fi
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if [ "$LARGEST_SIZE_BEFORE" -ne 0 ]; then
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PERCENT_CHANGE=$(echo "scale=2; 100 * $CHANGE / $LARGEST_SIZE_BEFORE" | bc)
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echo "Percentage change: $PERCENT_CHANGE%"
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fi
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echo
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echo "Files changed in this commit:"
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# Get the list of changed files
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CHANGED_FILES=$(git show --stat "$LARGEST_COMMIT" | grep '|' | sort -rn -k3)
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TOTAL_FILES=$(echo "$CHANGED_FILES" | wc -l)
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# If there are too many files, show only the top 10 with the most changes
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if [ "$TOTAL_FILES" -gt 10 ]; then
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echo "$CHANGED_FILES" | head -n 10
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echo "... and $(($TOTAL_FILES - 10)) more files (total: $TOTAL_FILES files changed)"
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else
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echo "$CHANGED_FILES"
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fi
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else
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echo "No commits analyzed."
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fi
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echo
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echo "Full results saved to: $TEMP_FILE"
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echo "You can import this CSV file into a spreadsheet for further analysis."
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# Make the script executable
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chmod +x "$0"
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