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# Create a temporary directory, much like mktemp -d does.
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# Copyright (C) 2007-2012 Free Software Foundation, Inc.
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Written by Jim Meyering.
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# Usage: mktempd /tmp phoey.XXXXXXXXXX
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# First, try to use the mktemp program.
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# Failing that, we'll roll our own mktemp-like function:
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# - try to get random bytes from /dev/urandom
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# - failing that, generate output from a combination of quickly-varying
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# sources and gzip. Ignore non-varying gzip header, and extract
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# "random" bits from there.
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# - given those bits, map to file-name bytes using tr, and try to create
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# the desired directory.
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# - make only $MAX_TRIES attempts
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die() { echo >&2 "$ME: $@"; exit 1; }
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chars=abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789
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if test -r "$dev_rand"; then
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# Note: 256-length($chars) == 194; 3 copies of $chars is 186 + 8 = 194.
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dd ibs=$n count=1 if="$dev_rand" 2>/dev/null \
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| tr -c $chars 01234567$chars$chars$chars
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cmds='date; date +%N; free; who -a; w; ps auxww; ps ef; netstat -n'
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data=` (eval "$cmds") 2>&1 | gzip `
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n_plus_50=`expr $n + 50`
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# Ensure that $data has length at least 50+$n
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len=`echo "$data"|wc -c`
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test $n_plus_50 -le $len && break;
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data=` (echo "$data"; eval "$cmds") 2>&1 | gzip `
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| dd bs=1 skip=50 count=$n 2>/dev/null \
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| tr -c $chars 01234567$chars$chars$chars
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*) die "Usage: $ME DIR TEMPLATE";;
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# Disallow any trailing slash on specified destdir:
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# it would subvert the post-mktemp "case"-based destdir test.
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*/) die "invalid destination dir: remove trailing slash(es)";;
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*) die "invalid template: $template (must have a suffix of at least 4 X's)";;
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# First, try to use mktemp.
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d=`env -u TMPDIR mktemp -d -t -p "$destdir" "$template" 2>/dev/null` \
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# The resulting name must be in the specified directory.
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case $d in "$destdir"*);; *) fail=1;; esac
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# It must have created the directory.
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test -d "$d" || fail=1
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# It must have 0700 permissions. Handle sticky "S" bits.
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perms=`ls -dgo "$d" 2>/dev/null|tr S -` || fail=1
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case $perms in drwx------*) ;; *) fail=1;; esac
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# If we reach this point, we'll have to create a directory manually.
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# Get a copy of the template without its suffix of X's.
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base_template=`echo "$template"|sed 's/XX*$//'`
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# Calculate how many X's we've just removed.
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template_length=`echo "$template" | wc -c`
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nx=`echo "$base_template" | wc -c`
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nx=`expr $template_length - $nx`
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candidate_dir="$destdir/$base_template$X"
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err=`mkdir -m 0700 "$candidate_dir" 2>&1` \
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&& { echo "$candidate_dir"; return; }
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test $MAX_TRIES -le $i && break;
added
removed
build-aux/mktempd
