mirror of
https://github.com/pyenv/pyenv.git
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118 lines
3.3 KiB
Bash
Executable file
118 lines
3.3 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 "$PROTOTYPE_SHIM_PATH"
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}
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# The basename of each argument passed to `make_shims` will be
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# registered for installation as a shim. In this way, plugins may call
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# `make_shims` with a glob to register many shims at once.
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make_shims() {
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local shims="$@"
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for file in $shims; do
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local shim="${file##*/}"
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register_shim "$shim"
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done
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}
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# Create an empty array for the list of registered shims and an empty
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# string to use as a search index.
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registered_shims=()
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registered_shims_index=""
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# We will keep track of shims registered for installation with the
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# global `reigstered_shims` array and with a global search index
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# string. The array will let us iterate over all registered shims. The
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# index string will let us quickly check whether a shim with the given
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# name has been registered or not.
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register_shim() {
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local shim="$@"
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registered_shims["${#registered_shims[@]}"]="$shim"
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registered_shims_index="$registered_shims_index/$shim/"
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}
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# To install all the registered shims, we iterate over the
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# `registered_shims` array and create a link if one does not already
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# exist.
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install_registered_shims() {
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local shim
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for shim in "${registered_shims[@]}"; do
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[ -e "$shim" ] || ln -f "$PROTOTYPE_SHIM_PATH" "$shim"
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done
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}
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# 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 *; do
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if [[ "$registered_shims_index" != *"/$shim/"* ]]; then
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rm -f "$shim"
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fi
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done
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}
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# Change to the shims directory.
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cd "$SHIM_PATH"
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# Create the prototype shim, then register 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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# Allow plugins to register shims.
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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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# Change back to the shims directory to install the registered shims
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# and remove stale shims.
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cd "$SHIM_PATH"
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install_registered_shims
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remove_stale_shims
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