Find file in git based on md5 checksum.

find_git_rev_by_md5.sh

#!/bin/bash

CHECKSUM=$1
FILE=$2

if [[ -z "$CHECKSUM" ]]; then
	echo "Usage: $0 md5 file"
	exit 1
fi
if [[ -z "$FILE" ]]; then
	echo "Usage: $0 md5 file"
	exit 1
fi

# Check if valid git repo
ROOT=$(git rev-parse --show-toplevel)
if [[ $? -ne 0 ]]; then
	echo "Not a valid git repo."
	exit 1
fi

# Get git revisions for file
REVS=$(git --no-pager log --pretty=%H $FILE)

# Get file path in git repo
FILE_REPO_PATH=$(git ls-files --full-name $FILE)

# Check each revision for checksum
TEMP_FILE="$(mktemp)"
for rev in $REVS; do
	git show $rev:$FILE_REPO_PATH > $TEMP_FILE
	if [[ -n `md5sum $TEMP_FILE | grep $CHECKSUM` ]]; then
		echo $rev
		break
	fi
done
rm -f $TEMP_FILE