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|
# Copyright (c) 2017 The NetBSD Foundation, Inc.
# All rights reserved.
#
# This code is derived from software contributed to The NetBSD Foundation
# by Johnny C. Lam.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
#
# NAME
# maketemp.subr -- make unique, temporary files
#
# SYNOPSIS
# task_maketemp [-dq] [-p tmpdir] [-t prefix] [template ...]
#
# DESCRIPTION
# The task_maketemp function creates temporary files or directories using
# unique names, and prints the names.
#
# OPTIONS
# The available options are as follows:
#
# -d Make a directory instead of a file.
#
# -p tmpdir
# Specifies the directory in which temporary files are created.
# If the "-p tmpdir" option is not specified, then the
# directory defaults to ${TMPDIR}, or to /tmp if ${TMPDIR} is
# empty.
#
# -q Fail silently if an error occurs.
#
# -t prefix
# Generate a template using an appropriate directory name,
# followed by the supplied prefix, followed by ".XXXXXXXX".
# Any "X" characters in the supplied prefix are taken
# literally, but the trailing "X" characters in the appended
# ".XXXXXXXX" are replaced by unique values.
#
# EXIT STATUS
# Returns 0 on success, and >0 if an error occurs.
#
# ENVIRONMENT
# The following variables are used if they are set:
#
# AWK The name or path to the awk(1) utility.
#
# CHMOD The name or path to the chmod(1) utility.
#
# MKTEMP The name or path to the mktemp(1) utility. task_maketemp
# attempts to use this utility first to create the requested
# temporary files.
#
# TMPDIR The default location in which temporary files are created.
#
__task_maketemp__="yes"
__task_maketemp_init__="_task_maketemp_init"
task_load cleanup
task_load createfile
task_load makedir
task_load random
task_maketemp()
{
: ${AWK:=awk}
: ${CHMOD:=chmod}
: ${MKTEMP:=mktemp}
# Default location in which temporary files and directories are
# are created.
#
local tmpdir="/tmp"
[ -z "${TMPDIR}" ] || tmpdir=${TMPDIR}
local output
output=$( { export TMPDIR=$tmpdir && ${MKTEMP} "$@"; } 2>/dev/null )
if [ $? -eq 0 ]; then
echo "$output"
return 0
fi
local result=0
local filetype="file"
local prefix="temp"
local quiet=
local arg
local OPTIND=1
while getopts ":dp:qt:" arg "$@"; do
case $arg in
d) filetype="dir" ;;
p) tmpdir=${OPTARG} ;;
q) quiet="yes" ;;
t) prefix=${OPTARG} ;;
*) return 127 ;;
esac
done
shift $(( ${OPTIND} - 1 ))
case $filetype in
dir|file)
: "valid temporary file type" ;;
*) return 1 ;;
esac
# Explicitly set the creation umask to 077, only allowing r/w/x for
# the owner.
#
__task_maketemp_save_umask__=$( umask ) || return 1
umask 077
[ $# -gt 0 ] || set -- "$tmpdir/$prefix.XXXXXXXX"
task_random
local template; for template; do echo "$template"; done |
${AWK} -v SEED=$RANDOM '
BEGIN {
chars = "abcdefghijklmnopqrstuvwxyz"
chars = chars "ABCDEFGHIJKLMNOPQRSTUVWXZZY"
chars = chars "0123456789"
n = split( chars, array, "" )
srand(SEED)
}
{
if ( match( $0, "X+$" ) > 0 ) {
s = substr( $0, 1, RSTART - 1 )
for ( i = 0; i < RLENGTH; i++ )
s = s array[ int( n * rand() ) + 1 ]
print s
} else
print
}' |
( while IFS= read name; do
case $filetype in
dir) if task_makedir -m 0700 "$name" 2>/dev/null &&
[ ! -h "$name" -a -d "$name" -a \
-r "$name" -a -w "$name" -a -x "$name" -a \
-O "$name" ]; then
: "success"
elif [ -z "$quiet" ]; then
return 1
else
echo 1>&2 "task_maketemp: error creating directory \`\`$name''"
return 1
fi ;;
file) if [ ! -e "$name" ] &&
task_createfile -m 0600 "$name" 2>/dev/null &&
[ ! -h "$name" -a -f "$name" -a \
-r "$name" -a -w "$name" -a \
-O "$name" ]; then
: "success"
elif [ -z "$quiet" ]; then
return 1
else
echo 1>&2 "task_maketemp: error creating file \`\`$name''"
return 1
fi ;;
esac
echo "$name"
done
return 0 )
result=$?
_task_maketemp_cleanup
return $result
}
_task_maketemp_cleanup()
{
if [ -n "$__task_maketemp_save_umask__" ]; then
umask $__task_maketemp_save_umask__
__task_maketemp_save_umask__=
fi
}
_task_maketemp_init()
{
task_cleanup_add_hook _task_maketemp_cleanup
}
# Static variable for the current umask before executing task_maketemp.
__task_maketemp_save_umask__=
|
