blob: d688fa98fce3cac4479a40fe9353dd52c2757016 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
#!/usr/bin/env sh
set -e
usage() {
# shellcheck disable=SC2016
echo 'usage: nextbin [-v] "$0" "$@"' >&2
}
case "$1" in
-v) action="echo"; shift;;
-*|'') usage; exit 1;;
*) action="exec"
esac
orig_exe=$1
shift
die() {
fmt=$1
shift
printf "nextbin %s failed: $fmt\n" "$orig_exe" "$@" >&2
exit 1
}
[ -n "$PATH" ] || die 'PATH is empty'
# shellcheck disable=SC3013
if [ / -ef / ] && ! [ / -ef /dev/null ]; then
same_file() {
# shellcheck disable=SC3013
[ "$1" -ef "$2" ]
}
else
if command -v bash >/dev/null 2>&1; then
exec bash "$0" "$orig_exe" "$@"
fi
ino() {
ls=$(ls -i "$1")
printf '%s\n' "${ls%% *}"
}
dev() {
df -P "$1" | awk 'END{print $1}'
}
same_file() {
[ "$(ino "$1")" = "$(ino "$2")" ] && [ "$(dev "$1")" = "$(dev "$2")" ]
}
fi
case $orig_exe in
/*) ;;
*) die 'non-absolute $0'
esac
exe_name=${orig_exe##*/}
path=$PATH
phase=1
found=
while :; do
exe=${path%%:*}/$exe_name
if [ -f "$exe" ] && [ -x "$exe" ]; then
if [ "$phase" = 1 ]; then
if same_file "$exe" "$orig_exe"; then
phase=2
fi
elif same_file "$exe" "$orig_exe"; then
[ -z "$found" ] || die 'duplicate PATH entries found'
elif [ -z "$found" ]; then
found=$exe
fi
fi
case $path in
*:*) path=${path#*:} ;;
*) break ;;
esac
done
if [ "$phase" = 1 ]; then
found=$(command -v "$exe_name") || die '%s is not in PATH' "$exe_name"
elif [ -z "$found" ]; then
die '%s is last instance' "$orig_exe"
fi
"$action" "$found" "$@"
|
