Assignment 1: Pushy
主要是用shell实现git的功能，难度较高
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部分代码：
root@c0e23c71e7d3:~# cat pigs-rm
#!/bin/dash
# check if the repository directory exists, and create the index directory and deleted files list if they do not exist
check_init() {
if [ ! -d .pig ]; then
echo "pigs-add: error: pigs repository directory .pig not found"
exit 0
fi
if [ ! -d .pig/index ]; then
mkdir .pig/index/
fi
if [ ! -f .pig/index/.deleted ]; then
touch .pig/index/.deleted
fi
}
check_init
force=0
cached=0
filenames=""
# parse command-line arguments
for arg in "$@"; do
case $arg in
--force)
force=1
;;
--cached)
cached=1
;;
*)
filenames="${filenames} ${arg}"
;;
esac
done
# get the commit ID of the latest commit
commit_id=$(find .pig/commit/ -mindepth 1 -maxdepth 1 -type d 2>/dev/null | wc -l)
commit_id=$((commit_id - 1))
for filename in $filenames; do
if [ $force -eq 0 ] && [ $cached -eq 1 ];then
if [ -f .pig/index/"$filename" ] ; then
if ! cmp -s .pig/index/"$filename" .pig/commit/$commit_id/"$filename"; then
if ! cmp -s .pig/index/"$filename" "$filename"; then
echo "pigs-rm: error: '$filename' in index is different to both the working file and the repository"
exit 1
fi
fi
if ! cmp -s .pig/index/"$filename" "$filename"; then
echo "pigs-rm: error: '$filename' has staged changes in the index"
exit 1
fi
fi
else
# compare the file with the version in the latest commit
if [ $force -eq 0 ] && ! cmp -s "$filename" .pig/commit/$commit_id/"$filename" && cmp -s "$filename" .pig/index/"$filename"; then
echo "pigs-rm: error: '$filename' has staged changes in the index"
exit 1
fi
# deleted in index
if [ $force -eq 0 ] && [ -f "$filename" ] && [ -f .pig/index/"$filename" ] && grep -q -x "$filename" .pig/commit/"$commit_id"/.deleted 2>/dev/null ; then
echo "pigs-rm: error: '$filename' has staged changes in the index"
exit 1
fi
# compare the file with the version in the latest commit
if [ $force -eq 0 ] && [ -f "$filename" ] && [ -f .pig/commit/$commit_id/"$filename" ] && ! cmp -s "$filename" .pig/commit/$commit_id/"$filename"; then
if [ -f .pig/index/"$filename" ] && ! cmp -s .pig/index/"$filename" "$filename"; then
echo "pigs-rm: error: '$filename' in index is different to both the working file and the repository"
exit 1
fi
echo "pigs-rm: error: '$filename' in the repository is different to the working file"
exit 1
fi
# compare the file with the version in the index
if [ $force -eq 0 ] && [ -f "$filename" ] && [ -f .pig/index/"$filename" ] && ! cmp -s "$filename" .pig/index/"$filename" ; then
echo "pigs-rm: error: '$filename' has staged changes in the index"
exit 1
fi
fi
if [ ! -f .pig/index/"$filename" ] && grep -q -x "$filename" .pig/commit/"$commit_id"/.deleted 2>/dev/null; then
echo "pigs-rm: error: '$filename' is not in the pigs repository"
exit 1
fi
if [ ! -f .pig/index/"$filename" ] && grep -q -x "$filename" .pig/index/.deleted 2>/dev/null; then
echo "pigs-rm: error: '$filename' is not in the pigs repository"
exit 1
fi
# file has not been indexed, output error message and skip
if [ ! -f "$filename" ] && [ ! -f .pig/commit/$commit_id/"$filename" ]; then
echo "pigs-rm: error: '$filename' is not in the pigs repository"
exit 1
fi
if [ ! -f .pig/index/"$filename" ] && [ ! -f .pig/commit/"$commit_id"/"$filename" ]; then
echo "pigs-rm: error: '$filename' is not in the pigs repository"
exit 1
fi
# file has been indexed, but has already been deleted in the working directory
if [ $force -eq 0 ] && [ ! -f "$filename" ]; then
echo "pigs-rm: error: '$filename' has staged changes in the index"
exit 1
fi
# remove the file from the index
if [ -f .pig/index/"$filename" ]; then
rm .pig/index/"$filename"
fi
# add the file name to the deleted files list in the index
echo "$filename" >> .pig/index/.deleted
# if --cached option is not used, remove the file from the working directory
if [ $cached -eq 0 ]; then
rm "$filename"
fi
done