Find Git commit that contains a given file

find_git_commit_of_file.sh

#!/usr/bin/env bash                                                                                                                                                                                          
#                                                                                                                                                                                                            
# Given a file, find the Git commit that contains the file                                                                                                                                                   
#                                                                                                                                                                                                            
# Can be run from inside a git repository,                                                                                                                                                                   
# or the directory to the .git/objects directory accepted.                                                                                                                                                   
#                                                                                                                                                                                                            
# $ ./find_file_in_dir.sh /path/to/file                                                                                                                                                                      

_exit_on_error() {
    if [[ $? -ne 0 ]]; then
        echo -e "\n$(basename ${0}): Error: Couldn't find the file you were looking for"
    fi
}
trap _exit_on_error EXIT

_file=$1
_dir=$2
_git_dir=$(git rev-parse --git-dir 2>/dev/null)
if [[ $? -eq 0 ]]; then
    _dir="${_git_dir}/objects"
fi
if [[ ! -r $_file || ! -d $_dir ]]; then
    echo "Usage: ./$(basename ${0}) FILE_TO_FIND [DIR_TO_SEARCH]" >&2 && exit 1
fi
for i in $(\find "$_dir" -type f); do
    echo -en "\rSearching blob @ [${i}]"
    first=$(echo "${i}" | rev | cut -d'/' -f2 | rev)
    second=$(echo "${i}" | rev | cut -d'/' -f1 | rev)
    \diff -q $_file <(git cat-file blob "${first}${second}" 2>/dev/null) >/dev/null 2>&1
    if [[ $? -eq 0 ]]; then
        _blob="${first}${second}"
        echo -e "\nFound! Exact match of [${_file}] is [$(readlink -f ${i})]"
        git rev-list --all |
            while read commit; do
                if git ls-tree -r $commit | grep -q $_blob; then
                    echo -e "\nFound!!! Commit hash is [$commit]"
                    exit 0
                else
                    echo -en "\rSearching commit [$commit]"
                fi
            done
    fi
done
exit 1