关于 linux：如何在提交时限制文件大小？

list_new_or_modified_files()
{
    git diff --staged --name-status|sed -e '/^D/ d; /^D/! s/.\s\+//'
}

unmunge()
{
    local result="${1#"}"
    result="${result%"}"
    env echo -e"$result"
}

check_file_size()
{
    n=0
    while read -r munged_filename
    do
        f="$(unmunge"$munged_filename")"
        h=$(git ls-files -s"$f"|cut -d' ' -f 2)
        s=$(git cat-file -s"$h")
        if ["$s" -gt $hard_limit ]
        then
            env echo -E 1>&2"ERROR: hard size limit ($hard_limit) exceeded: $munged_filename ($s)"
            n=$((n+1))
        elif ["$s" -gt $soft_limit ]
        then
            env echo -E 1>&2"WARNING: soft size limit ($soft_limit) exceeded: $munged_filename ($s)"
        fi
    done

    [ $n -eq 0 ]
}

list_new_or_modified_files | check_file_size

status=0

bytesToHuman() {
  b=${1:-0}; d=''; s=0; S=({,K,M,G,T,P,E,Z,Y}B)
  while ((b > 1000)); do
    d="$(printf".%01d" $((b % 1000 * 10 / 1000)))"
    b=$((b / 1000))
    let s++
  done
  echo"$b$d${S[$s]}"
}

# Iterate over the zero-delimited list of staged files.
while IFS= read -r -d '' file ; do
  hash=$(git ls-files -s"$file" | cut -d ' ' -f 2)
  size=$(git cat-file -s"$hash")

  if (( $size > $hard_limit )); then
    echo"Error: Cannot commit '$file' because it is $(bytesToHuman $size), which exceeds the hard size limit of $(bytesToHuman $hard_limit)."
    status=1
  elif (( $size > $soft_limit )); then
    echo"Warning: '$file' is $(bytesToHuman $size), which exceeds the soft size limit of $(bytesToHuman $soft_limit). Please double check that you intended to commit this file."
  fi
done < <(git diff -z --staged --name-only --diff-filter=d)
exit $status

# If we haven't configured a file size limit, use default value of about 10M
if [ -z"$filesizelimit" ]; then
        filesizelimit=10000000
fi

# You specify a warning limit
filesizewarning=500000

# With this command, we can find information about the file coming in that has biggest size
# We also normalize the line for excess whitespace
biggest_checkin_normalized=$(git ls-tree --full-tree -r -l HEAD | sort -k 4 -n -r | head -1 | sed 's/^ *//;s/ *$//;s/\s\{1,\}/ /g' )

# Based on that, we can find what we are interested about
filesize=`echo $biggest_checkin_normalized | cut -d ' ' -f4,4`

# Actual comparison
# To cancel a push, we exit with status code 1
# It is also a good idea to print out some info about the cause of rejection
if [ $filesize -gt $filesizelimit ]; then

        # To be more user-friendly, we also look up the name of the offending file
        filename=`echo $biggest_checkin_normalized | cut -d ' ' -f5,5`

        echo"Error: Too large push attempted.">&2
        echo  >&2
        echo"File size limit is $filesizelimit, and you tried to push file named $filename of size $filesize.">&2
        echo"Contact configuration team if you really need to do this.">&2
        exit 1
elif [ $filesize -gt $filesizewarning ]; then
        echo"WARNING ! A file size is bigger that $filesizewarning"
fi
exit 0