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rbenv exec: avoid mutating PATH

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Enables shelling out from a ruby process started with rbenv to a ruby
process with a different RBENV_VERSION. Fixes #121

This removes the workaround created for #15 and solves `ruby -S` support
by setting RUBYPATH. PATH is never changed.

To illustrate how RUBYPATH changes in various configurations:

    PATH=~/bin:~/.rbenv/shims:/usr/bin:/bin
    RBENV_VERSION=1.8 ruby -S rake
    #=> executes ~/.rbenv/versions/1.8/bin/rake
    #=> RUBYPATH=~/bin:~/.rbenv/versions/1.8/bin:/usr/bin:/bin

    RBENV_VERSION=2.0 ruby -S rake
    #=> executes ~/.rbenv/versions/2.0/bin/rake
    #=> RUBYPATH=~/bin:~/.rbenv/versions/2.0/bin:/usr/bin:/bin

    RBENV_VERSION=system ruby -S rake
    #=> executes /usr/bin/rake
    #=> RUBYPATH=~/bin:/rbenv_shims_were_here:/usr/bin:/bin

    RBENV_VERSION=1.8 ruby -S rake
    #=> executes ~/.rbenv/versions/1.8/bin/rake
    #=> RUBYPATH=~/bin:~/.rbenv/versions/1.8/bin:/usr/bin:/bin
This commit is contained in:
Mislav Marohnić
2013-06-20 17:22:15 +02:00
parent 8b043038b8
commit db143bb654
3 changed files with 275 additions and 37 deletions
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64
libexec/rbenv-exec
View File

@@ -2,24 +2,59 @@
#
# Summary: Run an executable with the selected Ruby version
#
# Usage: rbenv exec <command> [arg1 arg2...]
# Usage: rbenv exec <command> [args...]
#
# Runs an executable by first preparing PATH so that the selected Ruby
# version's `bin' directory is at the front.
# Runs an executable contained by the currently selected Ruby's bin
# directory. Rough equivalent of:
#
# For example, if the currently selected Ruby version is 1.9.3-p327:
# rbenv exec bundle install
#
# is equivalent to:
# PATH="$RBENV_ROOT/versions/1.9.3-p327/bin:$PATH" bundle install
# exec "$(rbenv prefix)/bin/$command" args...
set -e
[ -n "$RBENV_DEBUG" ] && set -x
rubypath=""
# Provide rbenv completions
if [ "$1" = "--complete" ]; then
exec rbenv shims --short
fi
while true; do
case "$1" in
"--complete" )
exec rbenv shims --short
;;
"--rubypath" )
rubypath=1
shift 1
;;
* )
break
;;
esac
done
# Replace any "RBENV_ROOT/shims" or "RBENV_ROOT/versions/*/bin" paths in the
# list with the given path. If no replacements were made, prepend the path onto
# the list.
replace_shims_path() {
local path="$1"
local dir="$2"
# fake directory that serves as a placeholder for shims location in RUBYPATH:
local placeholder="/rbenv_shims_were_here"
local found=""
local result=""
local -a paths
IFS=: paths=($path)
for path in "${paths[@]}"; do
if [[ $path = "${RBENV_ROOT}/shims" || $path == "${RBENV_ROOT}/versions/"*/bin || $path = $placeholder ]]; then
found=1
result="${result}${dir:-$placeholder}:"
else
result="${result}${path}:"
fi
done
# if no rbenv paths were replaced, simply prepend the path
[ -n "$found" -o -z "$dir" ] || result="${dir}:${path}"
echo "${result%:}"
}
RBENV_VERSION="$(rbenv-version-name)"
RBENV_COMMAND="$1"
@@ -31,7 +66,6 @@ fi
export RBENV_VERSION
RBENV_COMMAND_PATH="$(rbenv-which "$RBENV_COMMAND")"
RBENV_BIN_PATH="${RBENV_COMMAND_PATH%/*}"
OLDIFS="$IFS"
IFS=$'\n' scripts=(`rbenv-hooks exec`)
@@ -41,7 +75,9 @@ for script in "${scripts[@]}"; do
done
shift 1
if [ "$RBENV_VERSION" != "system" ]; then
export PATH="${RBENV_BIN_PATH}:${PATH}"
if [ -n "$rubypath" ]; then
bindir=""
[ "$RBENV_VERSION" != "system" ] && bindir="${RBENV_COMMAND_PATH%/*}"
export RUBYPATH="$(replace_shims_path "${RUBYPATH:-$PATH}" "$bindir")"
fi
exec -a "$RBENV_COMMAND" "$RBENV_COMMAND_PATH" "$@"