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9dde161b65
$OLDPWD is a standard shell variable that contains the previous working directory as set by the "cd" command. No need to save $PWD to some custom variable. (We could also have used "cd -" but it prints out $OLDPWD too.)
72 lines
2 KiB
Bash
Executable file
72 lines
2 KiB
Bash
Executable file
#!/usr/bin/env bash
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set -e
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[ -n "$RBENV_DEBUG" ] && set -x
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SHIM_PATH="${RBENV_ROOT}/shims"
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PROTOTYPE_SHIM_PATH="${SHIM_PATH}/.rbenv-shim"
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# Create the shims directory if it doesn't already exist.
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mkdir -p "$SHIM_PATH"
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# Ensure only one instance of rbenv-rehash is running at a time by
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# setting the shell's `noclobber` option and attempting to write to
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# the prototype shim file. If the file already exists, print a warning
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# to stderr and exit with a non-zero status.
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set -o noclobber
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{ echo > "$PROTOTYPE_SHIM_PATH"
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} 2>/dev/null ||
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{ echo "rbenv: cannot rehash: $PROTOTYPE_SHIM_PATH exists"
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exit 1
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} >&2
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set +o noclobber
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# If we were able to obtain a lock, register a trap to clean up the
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# prototype shim when the process exits.
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trap remove_prototype_shim EXIT
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remove_prototype_shim() {
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rm -f "$PROTOTYPE_SHIM_PATH"
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}
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# The prototype shim file is a script that re-execs itself, passing
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# its filename and any arguments to `rbenv exec`. This file is
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# hard-linked for every binary and then removed. The linking technique
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# is fast, uses less disk space than unique files, and also serves as
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# a locking mechanism.
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create_prototype_shim() {
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cat > "$PROTOTYPE_SHIM_PATH" <<SH
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#!/usr/bin/env bash
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set -e
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export RBENV_ROOT="$RBENV_ROOT"
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exec rbenv exec "\${0##*/}" "\$@"
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SH
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chmod +x "$PROTOTYPE_SHIM_PATH"
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}
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# Make shims by iterating over every filename argument and creating a
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# hard link from the prototype shim to a file of the same name in the
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# shims directory, if one does not already exist.
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make_shims() {
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local glob="$@"
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for file in $glob; do
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local shim="${file##*/}"
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[ -e "$shim" ] || ln -f "$PROTOTYPE_SHIM_PATH" "$shim"
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done
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}
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# Empty out the shims directory and make it the working directory.
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rm -f "$SHIM_PATH"/*
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cd "$SHIM_PATH"
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# Create the prototype shim, then make shims for all known binaries.
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create_prototype_shim
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shopt -s nullglob
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make_shims ../versions/*/bin/*
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# Restore the previous working directory.
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cd "$OLDPWD"
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for script in $(rbenv-hooks rehash); do
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source "$script"
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done
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