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117
LICENSE
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117
LICENSE
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|
|
@ -0,0 +1,117 @@
|
|||
CC0 1.0 Universal
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Statement of Purpose
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The laws of most jurisdictions throughout the world automatically confer
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38
README.md
Normal file
38
README.md
Normal file
|
|
@ -0,0 +1,38 @@
|
|||
This is an implementation of `realpath -m` (also known as `realpath
|
||||
--canonicalize-missing`) for systems without coreutils. The differences to
|
||||
`realpath -m` are:
|
||||
|
||||
- different return value when a symlink loop is detected
|
||||
- also works if $PWD doesn't exist
|
||||
|
||||
The implementation is not POSIX compatible. Namely, POSIX does not specify the
|
||||
`readlink` utility used by this script. Instead, the script takes the pragmatic
|
||||
approach and just requires:
|
||||
|
||||
- a POSIX compliant shell (does not require bash), busybox sh will work
|
||||
- dirname and basename
|
||||
- sed
|
||||
- grep -E
|
||||
- readlink (without options)
|
||||
|
||||
As a result, the script works well under busybox.
|
||||
|
||||
The script is a port of [a bash script](https://github.com/bashup/realpaths)
|
||||
written by PJ Eby and released in the public domain. Likewise, the author of
|
||||
this script has waived all copyright on it as well. Differences of this
|
||||
implementation to the one in bash:
|
||||
|
||||
- much slower due to excessive forking
|
||||
- tests are pure shell without cram and without .devkit
|
||||
- functions are named realpath_foo instead of realpath.foo because a dot is
|
||||
not allowed in POSIX shell
|
||||
|
||||
To run the tests:
|
||||
|
||||
$ ./test.sh
|
||||
|
||||
To verify that the script works with busybox:
|
||||
|
||||
$ mkdir busybox
|
||||
$ busybox --install -s busybox
|
||||
$ PATH=$(pwd)/busybox ./test.sh
|
||||
143
realpath.sh
Executable file
143
realpath.sh
Executable file
|
|
@ -0,0 +1,143 @@
|
|||
#!/usr/bin/env sh
|
||||
|
||||
# Sets REPLY to the absolute, well-formed path of a physical directory that
|
||||
# contains (or would contain) the supplied path. (Equivalent to the dirname of
|
||||
# realpath.resolved "$1".) Always succeeds.
|
||||
realpath_location(){ realpath_follow "$1"; realpath_absolute "$REPLY" ".."; }
|
||||
|
||||
# Sets REPLY to the absolute, well-formed path of $1, with symlinks in the
|
||||
# final path portion resolved. (Equivalent to the realpath.absolute of
|
||||
# realpath.follow "$1".) Always succeeds. The result is not a symlink unless it
|
||||
# is inaccessible or part of a symlink cycle.
|
||||
realpath_resolved(){ realpath_follow "$1"; realpath_absolute "$REPLY"; }
|
||||
|
||||
realpath_dirname() { REPLY=$(dirname "$1"); }
|
||||
realpath_basename() { REPLY=$(basename "$1"); }
|
||||
|
||||
# Sets REPLY to the first non-symlink (or last accessible, non-looping symlink)
|
||||
# in the symlink chain beginning at $1. Replies with the unchanged $1 if it is
|
||||
# not a symlink. Always succeeds. The result is not a symlink unless it is
|
||||
# inaccessible or part of a symlink cycle. (Note: the result can be a relative
|
||||
# path, if both $1 and all the symlinks in the chain are relative. Use
|
||||
# realpath.resolved instead if you want a guaranteed-absolute path.)
|
||||
realpath_follow() {
|
||||
while [ -L "$1" ] && target=$(readlink -- "$1"); do
|
||||
realpath_dirname "$1"
|
||||
# Resolve relative to symlink's directory
|
||||
if [ "$REPLY" = "." ]; then
|
||||
REPLY=$target
|
||||
else
|
||||
case "$target" in
|
||||
/*)
|
||||
REPLY=$target;;
|
||||
*)
|
||||
REPLY=$REPLY/$target;;
|
||||
esac
|
||||
fi
|
||||
# Break out if we found a symlink loop
|
||||
for target; do [ "$REPLY" = "$target" ] && break 2; done
|
||||
# Add to the loop-detect list and tail-recurse
|
||||
set -- "$REPLY" "$@"
|
||||
done
|
||||
REPLY="$1"
|
||||
}
|
||||
|
||||
# Sets REPLY to the absolute, well-formed combination of the supplied path(s).
|
||||
# Always succeeds.
|
||||
#
|
||||
# Each path may be absolute or relative. The resulting path is the combination
|
||||
# of the last absolute path in the list supplied, combined with any relative
|
||||
# paths that follow it. If no absolute paths are given, the relative paths are
|
||||
# processed relative to $PWD -- so passing zero arguments simply returns $PWD.
|
||||
#
|
||||
# Relative path parts are resolved logically rather than physically. That is to
|
||||
# say, .. is processed by removing elements from the path string, rather than
|
||||
# by inspecting the filesystem. (So symlinks are not processed in any way, and
|
||||
# the existence or accessibility of the files and directories is irrelevant:
|
||||
# with the exception of defaulting to $PWD, the result is obtained solely via
|
||||
# string manipulation of the supplied paths.)
|
||||
#
|
||||
# As per POSIX, bash, Python, and other path handling libraries, absolute paths
|
||||
# beginning with exactly two slashes are treated specially. The string returned
|
||||
# by realpath.absolute will begin with two slashes if the last absolute path
|
||||
# argument began with exactly two slashes; otherwise the result will begin with
|
||||
# only one slash, no matter how many slashes the last absolute path argument
|
||||
# began with.
|
||||
realpath_absolute() {
|
||||
REPLY=$PWD
|
||||
while [ $# -gt 0 ]; do
|
||||
if echo "$1" | grep -E '^(//[^/]*)$' >/dev/null 2>&1; then
|
||||
REPLY=//
|
||||
first=$(echo "$1" | cut -c3-)
|
||||
shift
|
||||
set -- "$first" "$@"
|
||||
continue
|
||||
fi
|
||||
case $1 in
|
||||
/*)
|
||||
REPLY=/
|
||||
first=$(echo "$1" | sed -e 's/^\/\+//')
|
||||
shift
|
||||
set -- "$first" "$@"
|
||||
;;
|
||||
*/*)
|
||||
front=${1%%/*}
|
||||
back=$(echo "$1" | sed -e "s/^$front\\/\\+//")
|
||||
shift
|
||||
set -- "$front" "$back" "$@"
|
||||
;;
|
||||
''|.)
|
||||
shift
|
||||
;;
|
||||
..)
|
||||
realpath_dirname "$REPLY"
|
||||
shift
|
||||
;;
|
||||
*) REPLY="${REPLY%/}/$1"; shift ;;
|
||||
esac
|
||||
done
|
||||
}
|
||||
|
||||
# Sets REPLY to the fully canonicalized form of $1, recursively resolving
|
||||
# symlinks in every part of the path where that can be done, roughly equivalent
|
||||
# to realpath -m or readlink -m. Always succeeds, but potentially rather slow,
|
||||
# depending on how many directories are symlinks.
|
||||
#
|
||||
# You don't really need this function unless you are trying to determine
|
||||
# whether divergent paths lead to the "same" file. For use cases that don't
|
||||
# involve comparing paths, realpath.resolved should be sufficient, or perhaps
|
||||
# even realpath.absolute. (Note, too, that using canonical paths can result in
|
||||
# user confusion, since users then have to reconcile their inputs with your
|
||||
# outputs!)
|
||||
realpath_canonical() {
|
||||
realpath_follow "$1"; set -- "$REPLY" # $1 is now resolved
|
||||
realpath_basename "$1"; set -- "$1" "$REPLY" # $2 = basename $1
|
||||
realpath_dirname "$1"
|
||||
[ "$REPLY" != "$1" ] && realpath_canonical "$REPLY"; # recurse unless root
|
||||
realpath_absolute "$REPLY" "$2"; # combine canon parent w/basename
|
||||
}
|
||||
|
||||
# Sets REPLY to the shortest relative path from basedir to path. basedir
|
||||
# defaults to $PWD if not supplied. Always succeeds.
|
||||
#
|
||||
# The path and basedir are preprocessed with realpath.absolute, so they can be
|
||||
# relative paths, or absolute ones containing relative components. (The result
|
||||
# is identical to calling Python's os.path.relpath function with the same
|
||||
# arguments, but is much faster than even the fork to start Python would be.)
|
||||
#
|
||||
# The main use case for this function is portably creating relative symlinks
|
||||
# without needing ln --relative or realpath --relative-to. Specifically, if you
|
||||
# are doing ln -s somepath somedir/link, you can make it relative using
|
||||
# realpath.relative somepath somedir; ln -s "$REPLY" somedir/link.
|
||||
realpath_relative() {
|
||||
target=""
|
||||
realpath_absolute "$1"
|
||||
shift
|
||||
set -- "$REPLY" "$@"
|
||||
realpath_absolute "${2-$PWD}" X
|
||||
while realpath_dirname "$REPLY"; [ "$1" != "$REPLY" ] && [ "$1" = "${1#${REPLY%/}/}" ]; do
|
||||
target=../$target
|
||||
done
|
||||
[ "$1" = "$REPLY" ] && REPLY=${target%/} || REPLY="$target${1#${REPLY%/}/}"
|
||||
REPLY=${REPLY:-.}
|
||||
}
|
||||
257
test.sh
Executable file
257
test.sh
Executable file
|
|
@ -0,0 +1,257 @@
|
|||
#!/bin/sh
|
||||
|
||||
set -e
|
||||
|
||||
# we use the full path to realpath so that the coreutils version of realpath is
|
||||
# used even when run with busybox in $PATH
|
||||
realpath_m() {
|
||||
REPLY=$(/usr/bin/realpath -m "$1")
|
||||
}
|
||||
|
||||
assert() {
|
||||
expected=$1
|
||||
shift
|
||||
if "$@" && [ "$REPLY" = "$expected" ]; then
|
||||
numok=$((numok+1))
|
||||
else
|
||||
numfail=$((numfail+1))
|
||||
echo "$@: expected '$expected', got '$REPLY'"
|
||||
fi
|
||||
}
|
||||
|
||||
compare() {
|
||||
cmd=$1
|
||||
shift
|
||||
assert "$("$cmd" "$@")" realpath_"$cmd" "$@"
|
||||
}
|
||||
|
||||
numokay=0
|
||||
numfail=0
|
||||
|
||||
# realpath_dirname and realpath_basename should produce the same results as their operating system counterparts.
|
||||
|
||||
. "./realpath.sh"
|
||||
|
||||
for p1 in '' / // . ..; do
|
||||
for p2 in '' /; do
|
||||
for p3 in foo . ..; do
|
||||
for p4 in '' /bar /. /..; do
|
||||
for p5 in '' / // /// /. /..; do
|
||||
compare basename "$p1$p2$p3$p4$p5"
|
||||
compare dirname "$p1$p2$p3$p4$p5"
|
||||
done
|
||||
done
|
||||
done
|
||||
done
|
||||
done
|
||||
|
||||
## realpath_absolute
|
||||
|
||||
# Outputs PWD with no args, joins relative args to PWD, removes empty parts, and
|
||||
# canonicalizes ./..:
|
||||
|
||||
assert "$PWD" realpath_absolute
|
||||
assert "$PWD" realpath_absolute .
|
||||
assert "$PWD/x" realpath_absolute x
|
||||
assert "$PWD/x/y" realpath_absolute x y
|
||||
assert "$PWD/x/y" realpath_absolute x/z ../y
|
||||
assert "$PWD/x/y/z" realpath_absolute x y//z
|
||||
assert "$PWD/x/y/z" realpath_absolute x y '' z
|
||||
assert "$PWD/x/y/z" realpath_absolute x y '' z/.
|
||||
assert "$PWD/x/y/z" realpath_absolute x y '' z/. q .. r .. .. z
|
||||
|
||||
# Ignores arguments to the left of an absolute path:
|
||||
|
||||
assert /etc realpath_absolute /etc
|
||||
assert /etc/z/xq realpath_absolute x y z /etc/z q/../xq
|
||||
|
||||
# Preserves double (but not triple+) slashes at the beginning of an absolute
|
||||
# path:
|
||||
|
||||
assert //server/share/blah realpath_absolute //server share blah/
|
||||
assert /server/share/blah realpath_absolute ///server/share blah
|
||||
assert /server/share/blah realpath_absolute ////server/share blah
|
||||
|
||||
## realpath_relative path dir
|
||||
|
||||
# Outputs the relative path from dir to path:
|
||||
|
||||
assert y realpath_relative y .
|
||||
assert y realpath_relative x/y x
|
||||
assert ../y realpath_relative y x
|
||||
assert ../y/z realpath_relative a/y/z a/x
|
||||
assert ../../y realpath_relative y a/x
|
||||
assert ../../../y realpath_relative y a/b/x
|
||||
|
||||
# Avoids redundancy for common path elements:
|
||||
|
||||
assert . realpath_relative y y
|
||||
assert .. realpath_relative y y/x
|
||||
assert ../.. realpath_relative y y/z/x
|
||||
assert ../../.. realpath_relative /y /y/z/x/a
|
||||
|
||||
# Produces the same outputs as python's os.path.relpath:
|
||||
|
||||
relative() { /usr/bin/python3 -c 'import sys,os.path; sys.stdout.write(os.path.relpath(*sys.argv[1:3]))' "$@"; }
|
||||
compare relative /q /q/r/s
|
||||
compare relative /q/r /q/r/s
|
||||
compare relative /q/r/s /q/r/s
|
||||
compare relative /q/r/s/t /q/r/s
|
||||
compare relative /q/r/s/t/u /q/r/s
|
||||
compare relative /q/r/t /q/r/s
|
||||
compare relative /q/r/t/u /q/r/s
|
||||
compare relative /q/t /q/r/s
|
||||
compare relative /q/t/u /q/r/s
|
||||
compare relative /t/u/v /q/r/s
|
||||
|
||||
## realpath_follow
|
||||
|
||||
# Returns first non-symlink:
|
||||
|
||||
assert "x" realpath_follow x
|
||||
ln -s y x
|
||||
assert "y" realpath_follow x
|
||||
ln -s z y
|
||||
assert "z" realpath_follow x
|
||||
|
||||
# or last symlink before recursion sets in:
|
||||
|
||||
ln -s x z
|
||||
assert "z" realpath_follow x
|
||||
assert "y" realpath_follow z
|
||||
assert "x" realpath_follow y
|
||||
|
||||
# and relative-pathed symlinks are normalized to the symlink directory
|
||||
|
||||
mkdir q
|
||||
assert "q/../z" realpath_follow q/../x
|
||||
rm x y z; rmdir q
|
||||
|
||||
## realpath_canonical
|
||||
|
||||
# Current directory:
|
||||
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD" "$cmd" .
|
||||
assert "$PWD" "$cmd" "$PWD"
|
||||
done
|
||||
|
||||
# Nonexistent file:
|
||||
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/x" "$cmd" x
|
||||
assert "$PWD/x" "$cmd" "$PWD/x"
|
||||
done
|
||||
|
||||
# Symlink to non-existent target:
|
||||
|
||||
ln -s y x
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/y" "$cmd" x
|
||||
assert "$PWD/y" "$cmd" "$PWD/x"
|
||||
done
|
||||
|
||||
|
||||
# Symlink chain:
|
||||
|
||||
ln -s z y
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/z" "$cmd" x
|
||||
assert "$PWD/z" "$cmd" "$PWD/x"
|
||||
done
|
||||
|
||||
|
||||
# Symlink loop breaks on the looper:
|
||||
|
||||
ln -s y z
|
||||
# difference to realpath -m: returned path is the target
|
||||
assert "$PWD/z" realpath_canonical x
|
||||
assert "$PWD/y" realpath_m x
|
||||
rm x y z
|
||||
|
||||
|
||||
# Absolute links and directories:
|
||||
|
||||
touch y
|
||||
mkdir z
|
||||
ln -s $PWD/y x
|
||||
ln -s $PWD/x z/x
|
||||
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/y" "$cmd" x
|
||||
assert "$PWD/y" "$cmd" z/x
|
||||
done
|
||||
|
||||
ln -sf ../x z/x
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/y" "$cmd" x
|
||||
assert "$PWD/y" "$cmd" z/x
|
||||
done
|
||||
|
||||
ln -s z q
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/z" "$cmd" q
|
||||
assert "$PWD/y" "$cmd" q/../x
|
||||
assert "$PWD/z/a" "$cmd" q/a
|
||||
done
|
||||
|
||||
## realpath_location
|
||||
|
||||
# Returns the absolute (but not canonical) location of the directory physically
|
||||
# containing its target. Is equivalent to `realpath_absolute` if target isn't
|
||||
# a symlink:
|
||||
|
||||
assert "$PWD" realpath_location x
|
||||
assert "$PWD" realpath_location z
|
||||
assert "$PWD/z" realpath_location z/a
|
||||
assert "$PWD" realpath_location q/x # -> ../x
|
||||
assert "$PWD/q" realpath_location q/foo
|
||||
assert "$PWD" realpath_location q/../foo
|
||||
assert "$PWD/q/foo" realpath_location q/foo/bar
|
||||
|
||||
### Missing elements
|
||||
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$PWD/z/foo/bar/baz" "$cmd" q/foo/bar/baz
|
||||
assert "$PWD/z/foo/bar" "$cmd" q/foo/bar
|
||||
assert /non-existent "$cmd" /non-existent
|
||||
assert /etc/non-existent "$cmd" /etc/non-existent
|
||||
done
|
||||
|
||||
### Subdirectories, accessible and inaccessible
|
||||
|
||||
# Works while the directory is accesible:
|
||||
|
||||
mkdir foo
|
||||
cd foo
|
||||
for cmd in realpath_canonical realpath_m; do
|
||||
assert "$OLDPWD/z" "$cmd" "$OLDPWD/q"
|
||||
assert "$OLDPWD/y" "$cmd" "$OLDPWD/q/x"
|
||||
assert "$OLDPWD/y" "$cmd" "../q/x"
|
||||
done
|
||||
|
||||
# realpath -m cannot operate on inaccessible $PWD
|
||||
# We can follow symlinks even if $PWD is inaccessible:
|
||||
|
||||
rmdir ../foo
|
||||
assert "$OLDPWD/z" realpath_canonical "$OLDPWD/q"
|
||||
assert "$OLDPWD/y" realpath_canonical "../q/x"
|
||||
|
||||
# And we can do non-symlink canonicalizing on the base dir of the results:
|
||||
|
||||
assert "$OLDPWD/z" realpath_canonical "../z"
|
||||
assert "$OLDPWD/z/foo" realpath_canonical "../z/foo"
|
||||
assert "$OLDPWD/foo" realpath_canonical "../foo"
|
||||
assert "$OLDPWD/z" realpath_canonical "../q"
|
||||
|
||||
cd ..
|
||||
|
||||
rm x y q z/x
|
||||
rmdir z
|
||||
|
||||
echo "number of successes: $numok"
|
||||
echo "number of failures: $numfail"
|
||||
|
||||
if [ "$numfail" -gt 0 ]; then
|
||||
exit 1
|
||||
fi
|
||||
Loading…
Reference in a new issue