Merge pull request #1145 from pyenv/rehash-wait

Wait rehash until lock acquisition
This commit is contained in:
Yamashita, Yuu 2018-05-01 09:37:03 +09:00 committed by GitHub
commit df0437f111
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2 changed files with 47 additions and 16 deletions

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@ -10,30 +10,51 @@ PROTOTYPE_SHIM_PATH="${SHIM_PATH}/.pyenv-shim"
# Create the shims directory if it doesn't already exist.
mkdir -p "$SHIM_PATH"
# Ensure only one instance of pyenv-rehash is running at a time by
# setting the shell's `noclobber` option and attempting to write to
# the prototype shim file. If the file already exists, print a warning
# to stderr and exit with a non-zero status.
set -o noclobber
{ echo > "$PROTOTYPE_SHIM_PATH"
} 2>| /dev/null ||
{ if [ -w "$SHIM_PATH" ]; then
echo "pyenv: cannot rehash: $PROTOTYPE_SHIM_PATH exists"
else
echo "pyenv: cannot rehash: $SHIM_PATH isn't writable"
fi
exit 1
} >&2
set +o noclobber
acquire_lock() {
# Ensure only one instance of pyenv-rehash is running at a time by
# setting the shell's `noclobber` option and attempting to write to
# the prototype shim file. If the file already exists, print a warning
# to stderr and exit with a non-zero status.
local ret
set -o noclobber
echo > "$PROTOTYPE_SHIM_PATH" 2>| /dev/null || ret=1
set +o noclobber
[ -z "${ret}" ]
}
# If we were able to obtain a lock, register a trap to clean up the
# prototype shim when the process exits.
trap remove_prototype_shim EXIT
trap release_lock EXIT
remove_prototype_shim() {
rm -f "$PROTOTYPE_SHIM_PATH"
}
release_lock() {
remove_prototype_shim
}
if [ ! -w "$SHIM_PATH" ]; then
echo "pyenv: cannot rehash: $SHIM_PATH isn't writable"
exit 1
fi
unset acquired
for _ in $(seq "${PYENV_REHASH_TIMEOUT:-60}"); do
if acquire_lock 2>/dev/null; then
acquired=1
break
else
# POSIX sleep(1) doesn't provides time precision of subsecond
sleep 1
fi
done
if [ -z "${acquired}" ]; then
echo "pyenv: cannot rehash: $PROTOTYPE_SHIM_PATH exists"
exit 1
fi
# The prototype shim file is a script that re-execs itself, passing
# its filename and any arguments to `pyenv exec`. This file is
# hard-linked for every executable and then removed. The linking

View file

@ -25,12 +25,22 @@ create_executable() {
}
@test "rehash in progress" {
export PYENV_REHASH_TIMEOUT=1
mkdir -p "${PYENV_ROOT}/shims"
touch "${PYENV_ROOT}/shims/.pyenv-shim"
run pyenv-rehash
assert_failure "pyenv: cannot rehash: ${PYENV_ROOT}/shims/.pyenv-shim exists"
}
@test "wait until lock acquisition" {
export PYENV_REHASH_TIMEOUT=5
mkdir -p "${PYENV_ROOT}/shims"
touch "${PYENV_ROOT}/shims/.pyenv-shim"
bash -c "sleep 1 && rm -f ${PYENV_ROOT}/shims/.pyenv-shim" &
run pyenv-rehash
assert_success
}
@test "creates shims" {
create_executable "2.7" "python"
create_executable "2.7" "fab"