db8c40249f
pkgtasks is a shell script library to ease writing POSIX-compliant
shell scripts to handle common tasks during installation or removal
of a package, e.g.,
* creating groups and users needed by the package
* creating and removing directories with special permissions and
ownership,
* copying example config files to their final locations during
package installation, and removing them during package removal
if they don't differ from the example ones,
* reminding the user of files that may be customized after
package installation.
148 lines
3.8 KiB
Text
148 lines
3.8 KiB
Text
# Copyright (c) 2017 The NetBSD Foundation, Inc.
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# All rights reserved.
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#
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# This code is derived from software contributed to The NetBSD Foundation
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# by Johnny C. Lam.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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# 1. Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# 2. Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in the
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# documentation and/or other materials provided with the distribution.
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#
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# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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#
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# NAME
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# dirwalk.subr -- walk a directory tree using depth-first traversal
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#
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# SYNOPSIS
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# task_dirwalk [-d | -f] path
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#
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# DESCRIPTION
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# The task_dirwalk function walks the filesystem starting at the given
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# path and outputs the contents using depth-first traversal.
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#
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# The options are as follows:
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#
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# -d Only output the directory entries.
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#
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# -f Only output non-directory entries (files, symlinks, etc).
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#
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# RETURN VALUES
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# Returns 0 on success, and >0 if an error occurs.
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#
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# ENVIRONMENT
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# The following variables are used if they are set:
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#
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# FIND The name or path to the find(1) utility.
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#
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__task_dirwalk__="yes"
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task_load quote
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task_dirwalk()
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{
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: ${FIND:=find}
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local output="all"
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local arg
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local OPTIND=1
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while getopts ":df" arg "$@"; do
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case $arg in
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d) case $output in
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all) output="dirs" ;;
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*) return 127 ;;
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esac ;;
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f) case $output in
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all) output="files" ;;
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*) return 127 ;;
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esac ;;
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*) return 127 ;;
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esac
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done
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shift $(( ${OPTIND} - 1 ))
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[ $# -gt 0 ] || return 127
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[ -e "$1" ] || return 0
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if [ ! -d "$1" ]; then
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case $output in
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files) echo "$1" ;;
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esac
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return 0
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fi
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# Use find(1) if it is present.
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case $output in
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all) { ${FIND} "$1" -print; } 2>/dev/null ;;
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dirs) { ${FIND} "$1" -type d -print; } 2>/dev/null ;;
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files) { ${FIND} "$1" \! -type d -print; } 2>/dev/null ;;
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esac
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[ $? -gt 0 ] || return 0
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( cwd=
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set -- "$1"
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while [ $# -gt 0 ]; do
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# Pop the top entry off the front of the stack and print it.
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top=$1; shift
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if [ "$top" = "__EOD__" ]; then
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cd ..
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case $cwd in
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*/*) cwd=${cwd%/*} ;;
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*) cwd= ;;
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esac
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continue
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fi
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case $cwd in
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"") path=$top ;;
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*) path="$cwd/$top" ;;
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esac
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case $output in
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all) echo "$path" ;;
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dirs) if [ ! -h "$top" -a -d "$top" ]; then
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echo "$path"
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fi ;;
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files) if [ ! -h "$top" -a -d "$top" ]; then
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: "directory"
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else
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echo "$path"
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fi ;;
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esac
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# Push all entries in the directory onto the stack.
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if [ ! -h "$top" -a -d "$top" ]; then
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cd "$top" 2>/dev/null || continue
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cwd=$path
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stack=
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# XXX This expansion could break with too many files.
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for entry in .* *; do
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case $entry in
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.|..) continue ;;
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".*"|"*")
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break ;;
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esac
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task_quote "$entry"
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stack="$stack $quoted"
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done
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case $stack in
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"") stack="__EOD__" ;;
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*) stack="$stack __EOD__" ;;
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esac
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task_quote "$@"
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eval set -- $stack $quoted
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fi
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done )
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}
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