#!/bin/sh
# Usage: git-ls-object-refs <object>
# Find references to <object> SHA1 in refs, commits, and trees. All of them.
o="$1"

# rawdawgn' it
set +e

# echo "refs:"
# git show-ref |grep "$o"
# echo

git log --all --pretty=oneline --decorate |grep "$o" |
sed 's|^\([0-9a-f]\{40\}\)|commit referenced from at least one ref: \1|'

for ref in $(git for-each-ref --format='%(refname)')
do
    (git rev-list "$ref" | grep "$o") 2>&1 |
    sed "s|^[0-9a-f]\{40\}$|commit referenced from $ref|"
done

for p in $(git rev-list --all)
do
    (git ls-tree -r "$p" |grep "$o") 2>&1 |
    sed "s|^|object referenced from tree of commit $p:\n|"
done
echo