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1381c2ca79
It doesn't need to be a bash array and we don't need a separate index of shims registered. Simply keep everything in a space-separated string and use that as an index as well. This assumes that executable names *never* have spaces in them.
149 lines
3.7 KiB
Bash
Executable file
149 lines
3.7 KiB
Bash
Executable file
#!/usr/bin/env bash
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# Summary: Rehash rbenv shims (run this after installing executables)
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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 > "$PROTOTYPE_SHIM_PATH"
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} 2>/dev/null ||
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{ if [ -w "$SHIM_PATH" ]; then
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echo "rbenv: cannot rehash: $PROTOTYPE_SHIM_PATH exists"
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else
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echo "rbenv: cannot rehash: $SHIM_PATH isn't writable"
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fi
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exit 1
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} >&2
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set +o noclobber
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# If we were able to obtain a lock, register a trap to clean up the
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# prototype shim when the process exits.
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trap remove_prototype_shim EXIT
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remove_prototype_shim() {
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rm -f "$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 executable and then removed. The linking
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# technique is fast, uses less disk space than unique files, and also
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# serves as a locking mechanism.
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create_prototype_shim() {
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cat > "$PROTOTYPE_SHIM_PATH" <<SH
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#!/usr/bin/env bash
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set -e
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[ -n "\$RBENV_DEBUG" ] && set -x
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program="\${0##*/}"
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if [ "\$program" = "ruby" ]; then
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for arg; do
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case "\$arg" in
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-e* | -- ) break ;;
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*/* )
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if [ -f "\$arg" ]; then
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export RBENV_DIR="\${arg%/*}"
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break
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fi
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;;
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esac
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done
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fi
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export RBENV_ROOT="$RBENV_ROOT"
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exec "$(command -v rbenv)" exec "\$program" "\$@"
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SH
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chmod +x "$PROTOTYPE_SHIM_PATH"
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}
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# If the contents of the prototype shim file differ from the contents
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# of the first shim in the shims directory, assume rbenv has been
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# upgraded and the existing shims need to be removed.
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remove_outdated_shims() {
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local shim
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for shim in "$SHIM_PATH"/*; do
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if ! diff "$PROTOTYPE_SHIM_PATH" "$shim" >/dev/null 2>&1; then
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rm -f "$SHIM_PATH"/*
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fi
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break
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done
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}
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# List basenames of executables for every Ruby version
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list_executable_names() {
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local file
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for file in "$RBENV_ROOT"/versions/*/bin/*; do
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echo "${file##*/}"
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done
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}
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# The basename of each argument passed to `make_shims` will be
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# registered for installation as a shim. In this way, plugins may call
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# `make_shims` with a glob to register many shims at once.
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make_shims() {
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local file shim
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for file; do
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shim="${file##*/}"
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register_shim "$shim"
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done
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}
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registered_shims=" "
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# Registers the name of a shim to be generated.
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register_shim() {
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registered_shims="${registered_shims}${1} "
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}
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# Install all the shims registered via `make_shims` or `register_shim` directly.
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install_registered_shims() {
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local shim file
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for shim in $registered_shims; do
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file="${SHIM_PATH}/${shim}"
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[ -e "$file" ] || ln -f "$PROTOTYPE_SHIM_PATH" "$file"
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done
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}
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# Once the registered shims have been installed, we make a second pass
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# over the contents of the shims directory. Any file that is present
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# in the directory but has not been registered as a shim should be
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# removed.
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remove_stale_shims() {
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local shim
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for shim in "$SHIM_PATH"/*; do
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if [[ "$registered_shims" != *" ${shim##*/} "* ]]; then
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rm -f "$shim"
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fi
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done
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}
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shopt -s nullglob
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# Create the prototype shim, then register shims for all known
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# executables.
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create_prototype_shim
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remove_outdated_shims
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make_shims $(list_executable_names | sort -u)
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# Allow plugins to register shims.
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OLDIFS="$IFS"
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IFS=$'\n' scripts=(`rbenv-hooks rehash`)
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IFS="$OLDIFS"
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for script in "${scripts[@]}"; do
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source "$script"
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done
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install_registered_shims
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remove_stale_shims
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