Fix user query when using libc implementation of os/user #972
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Fixes #191
In the case where the user is not in
/etc/passwd
(for e.g. LDAP), the cgo implementation ofos/user
which uses thelibc
functions is not able to find the user name and home directory.This fix implements a fallback that uses the
$USER
and$HOME
environment variables.Note: This problem does not occur when using the pure go implementation of
os/user
(for e.g. when specifyingCGO_ENABLED=0
) which already implements the same kind of fallback.