store: add a `target_id` attribute on RevlogStoreEntry
This hold the "target" (file, directory, etc) of a revlog. Having this
available will help a lot of code to avoid direct file path access.
#!/usr/bin/env python3
import errno
import os
import sys
for f in sys.argv[1:]:
try:
print(f, '->', os.readlink(f))
except OSError as err:
if err.errno != errno.EINVAL:
raise
print(f, '->', f, 'not a symlink')
sys.exit(0)