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@ -13,7 +13,69 @@
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# current arthas script version
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ARTHAS_SCRIPT_VERSION=3.1.1
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DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
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# SYNOPSIS
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# rreadlink <fileOrDirPath>
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# DESCRIPTION
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# Resolves <fileOrDirPath> to its ultimate target, if it is a symlink, and
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# prints its canonical path. If it is not a symlink, its own canonical path
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# is printed.
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# A broken symlink causes an error that reports the non-existent target.
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# LIMITATIONS
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# - Won't work with filenames with embedded newlines or filenames containing
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# the string ' -> '.
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# COMPATIBILITY
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# This is a fully POSIX-compliant implementation of what GNU readlink's
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# -e option does.
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# EXAMPLE
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# In a shell script, use the following to get that script's true directory of origin:
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# trueScriptDir=$(dirname -- "$(rreadlink "$0")")
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rreadlink() ( # Execute the function in a *subshell* to localize variables and the effect of `cd`.
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target=$1 fname= targetDir= CDPATH=
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# Try to make the execution environment as predictable as possible:
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# All commands below are invoked via `command`, so we must make sure that
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# `command` itself is not redefined as an alias or shell function.
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# (Note that command is too inconsistent across shells, so we don't use it.)
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# `command` is a *builtin* in bash, dash, ksh, zsh, and some platforms do not
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# even have an external utility version of it (e.g, Ubuntu).
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# `command` bypasses aliases and shell functions and also finds builtins
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# in bash, dash, and ksh. In zsh, option POSIX_BUILTINS must be turned on for
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# that to happen.
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{ \unalias command; \unset -f command; } >/dev/null 2>&1
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[ -n "$ZSH_VERSION" ] && options[POSIX_BUILTINS]=on # make zsh find *builtins* with `command` too.
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while :; do # Resolve potential symlinks until the ultimate target is found.
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[ -L "$target" ] || [ -e "$target" ] || { command printf '%s\n' "ERROR: '$target' does not exist." >&2; return 1; }
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command cd "$(command dirname -- "$target")" # Change to target dir; necessary for correct resolution of target path.
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fname=$(command basename -- "$target") # Extract filename.
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[ "$fname" = '/' ] && fname='' # !! curiously, `basename /` returns '/'
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if [ -L "$fname" ]; then
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# Extract [next] target path, which may be defined
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# *relative* to the symlink's own directory.
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# Note: We parse `ls -l` output to find the symlink target
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# which is the only POSIX-compliant, albeit somewhat fragile, way.
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target=$(command ls -l "$fname")
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target=${target#* -> }
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continue # Resolve [next] symlink target.
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fi
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break # Ultimate target reached.
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done
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targetDir=$(command pwd -P) # Get canonical dir. path
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# Output the ultimate target's canonical path.
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# Note that we manually resolve paths ending in /. and /.. to make sure we have a normalized path.
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if [ "$fname" = '.' ]; then
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command printf '%s\n' "${targetDir%/}"
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elif [ "$fname" = '..' ]; then
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# Caveat: something like /var/.. will resolve to /private (assuming /var@ -> /private/var), i.e. the '..' is applied
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# AFTER canonicalization.
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command printf '%s\n' "$(command dirname -- "${targetDir}")"
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else
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command printf '%s\n' "${targetDir%/}/$fname"
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fi
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)
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DIR=$(dirname -- "$(rreadlink "${BASH_SOURCE[0]}")")
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############ Command Arguments ############
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@ -150,68 +212,6 @@ check_permission()
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}
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# SYNOPSIS
|
|
|
|
|
# rreadlink <fileOrDirPath>
|
|
|
|
|
# DESCRIPTION
|
|
|
|
|
# Resolves <fileOrDirPath> to its ultimate target, if it is a symlink, and
|
|
|
|
|
# prints its canonical path. If it is not a symlink, its own canonical path
|
|
|
|
|
# is printed.
|
|
|
|
|
# A broken symlink causes an error that reports the non-existent target.
|
|
|
|
|
# LIMITATIONS
|
|
|
|
|
# - Won't work with filenames with embedded newlines or filenames containing
|
|
|
|
|
# the string ' -> '.
|
|
|
|
|
# COMPATIBILITY
|
|
|
|
|
# This is a fully POSIX-compliant implementation of what GNU readlink's
|
|
|
|
|
# -e option does.
|
|
|
|
|
# EXAMPLE
|
|
|
|
|
# In a shell script, use the following to get that script's true directory of origin:
|
|
|
|
|
# trueScriptDir=$(dirname -- "$(rreadlink "$0")")
|
|
|
|
|
rreadlink() ( # Execute the function in a *subshell* to localize variables and the effect of `cd`.
|
|
|
|
|
|
|
|
|
|
target=$1 fname= targetDir= CDPATH=
|
|
|
|
|
|
|
|
|
|
# Try to make the execution environment as predictable as possible:
|
|
|
|
|
# All commands below are invoked via `command`, so we must make sure that
|
|
|
|
|
# `command` itself is not redefined as an alias or shell function.
|
|
|
|
|
# (Note that command is too inconsistent across shells, so we don't use it.)
|
|
|
|
|
# `command` is a *builtin* in bash, dash, ksh, zsh, and some platforms do not
|
|
|
|
|
# even have an external utility version of it (e.g, Ubuntu).
|
|
|
|
|
# `command` bypasses aliases and shell functions and also finds builtins
|
|
|
|
|
# in bash, dash, and ksh. In zsh, option POSIX_BUILTINS must be turned on for
|
|
|
|
|
# that to happen.
|
|
|
|
|
{ \unalias command; \unset -f command; } >/dev/null 2>&1
|
|
|
|
|
[ -n "$ZSH_VERSION" ] && options[POSIX_BUILTINS]=on # make zsh find *builtins* with `command` too.
|
|
|
|
|
|
|
|
|
|
while :; do # Resolve potential symlinks until the ultimate target is found.
|
|
|
|
|
[ -L "$target" ] || [ -e "$target" ] || { command printf '%s\n' "ERROR: '$target' does not exist." >&2; return 1; }
|
|
|
|
|
command cd "$(command dirname -- "$target")" # Change to target dir; necessary for correct resolution of target path.
|
|
|
|
|
fname=$(command basename -- "$target") # Extract filename.
|
|
|
|
|
[ "$fname" = '/' ] && fname='' # !! curiously, `basename /` returns '/'
|
|
|
|
|
if [ -L "$fname" ]; then
|
|
|
|
|
# Extract [next] target path, which may be defined
|
|
|
|
|
# *relative* to the symlink's own directory.
|
|
|
|
|
# Note: We parse `ls -l` output to find the symlink target
|
|
|
|
|
# which is the only POSIX-compliant, albeit somewhat fragile, way.
|
|
|
|
|
target=$(command ls -l "$fname")
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|
|
|
|
target=${target#* -> }
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continue # Resolve [next] symlink target.
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|
|
|
fi
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|
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break # Ultimate target reached.
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|
|
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done
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|
|
|
|
targetDir=$(command pwd -P) # Get canonical dir. path
|
|
|
|
|
# Output the ultimate target's canonical path.
|
|
|
|
|
# Note that we manually resolve paths ending in /. and /.. to make sure we have a normalized path.
|
|
|
|
|
if [ "$fname" = '.' ]; then
|
|
|
|
|
command printf '%s\n' "${targetDir%/}"
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|
|
|
|
elif [ "$fname" = '..' ]; then
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|
|
|
|
# Caveat: something like /var/.. will resolve to /private (assuming /var@ -> /private/var), i.e. the '..' is applied
|
|
|
|
|
# AFTER canonicalization.
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|
|
|
|
command printf '%s\n' "$(command dirname -- "${targetDir}")"
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else
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command printf '%s\n' "${targetDir%/}/$fname"
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fi
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)
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# reset arthas work environment
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# reset some options for env
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reset_for_env()
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hengyunabc
6 years ago