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#!/bin/sh
DIR="$1"
COMMIT="$2"
if [ -z "$COMMIT" ]; then
COMMIT=HEAD
fi
# Taken from git-subtree (Copyright (C) 2009 Avery Pennarun <apenwarr@gmail.com>)
find_latest_squash()
{
dir="$1"
sq=
main=
sub=
git log --grep="^git-subtree-dir: $dir/*\$" \
--pretty=format:'START %H%n%s%n%n%b%nEND%n' "$COMMIT" |
while read a b junk; do
case "$a" in
START) sq="$b" ;;
git-subtree-mainline:) main="$b" ;;
git-subtree-split:) sub="$b" ;;
END)
if [ -n "$sub" ]; then
if [ -n "$main" ]; then
# a rejoin commit?
# Pretend its sub was a squash.
sq="$sub"
fi
echo "$sq" "$sub"
break
fi
sq=
main=
sub=
;;
esac
done
}
latest_squash="$(find_latest_squash "$DIR")"
if [ -z "$latest_squash" ]; then
echo "ERROR: $DIR is not a subtree" >&2
exit 2
fi
set $latest_squash
old=$1
rev=$2
if [ "d$(git cat-file -t $rev 2>/dev/null)" != dcommit ]; then
echo "ERROR: subtree commit $rev unavailable. Fetch/update the subtree repository" >&2
exit 2
fi
tree_subtree=$(git show -s --format="%T" $rev)
echo "$DIR in $COMMIT was last updated to upstream commit $rev (tree $tree_subtree)"
tree_actual=$(git ls-tree -d "$COMMIT" "$DIR" | head -n 1)
if [ -z "$tree_actual" ]; then
echo "FAIL: subtree directory $DIR not found in $COMMIT" >&2
exit 1
fi
set $tree_actual
tree_actual_type=$2
tree_actual_tree=$3
echo "$DIR in $COMMIT currently refers to $tree_actual_type $tree_actual_tree"
if [ "d$tree_actual_type" != "dtree" ]; then
echo "FAIL: subtree directory $DIR is not a tree in $COMMIT" >&2
exit 1
fi
if [ "$tree_actual_tree" != "$tree_subtree" ]; then
git diff-tree $tree_actual_tree $tree_subtree >&2
echo "FAIL: subtree directory tree doesn't match subtree commit tree" >&2
exit 1
fi
echo "GOOD"
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