mirror of
git://git.musl-libc.org/musl
synced 2024-11-27 12:04:14 +08:00
7cbb6f70c8
install.sh was wrongly waiting until after atomically replacing the old file to set the correct permissions on the new file. in the case of the dynamic linker, this would cause a dynamic-linked chmod command not to run (due to missing executable permissions on the dynamic linker) and thus leave the system in an unusable state. even if chmod is static-linked, the old behavior had a race window where dynamic-linked programs could fail to run.
65 lines
924 B
Bash
Executable File
65 lines
924 B
Bash
Executable File
#!/bin/sh
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#
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# This is an actually-safe install command which installs the new
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# file atomically in the new location, rather than overwriting
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# existing files.
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#
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usage() {
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printf "usage: %s [-D] [-l] [-m mode] src dest\n" "$0" 1>&2
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exit 1
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}
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mkdirp=
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symlink=
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mode=755
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while getopts Dlm: name ; do
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case "$name" in
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D) mkdirp=yes ;;
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l) symlink=yes ;;
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m) mode=$OPTARG ;;
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?) usage ;;
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esac
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done
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shift $(($OPTIND - 1))
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test "$#" -eq 2 || usage
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src=$1
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dst=$2
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tmp="$dst.tmp.$$"
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case "$dst" in
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*/) printf "%s: %s ends in /\n", "$0" "$dst" 1>&2 ; exit 1 ;;
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esac
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set -C
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set -e
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if test "$mkdirp" ; then
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umask 022
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case "$2" in
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*/*) mkdir -p "${dst%/*}" ;;
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esac
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fi
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trap 'rm -f "$tmp"' EXIT INT QUIT TERM HUP
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umask 077
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if test "$symlink" ; then
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ln -s "$1" "$tmp"
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else
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cat < "$1" > "$tmp"
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chmod "$mode" "$tmp"
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fi
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mv -f "$tmp" "$2"
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test -d "$2" && {
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rm -f "$2/$tmp"
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printf "%s: %s is a directory\n" "$0" "$dst" 1>&2
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exit 1
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}
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exit 0
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