[libvirt] [PATCH 1/2] util: Don't fail virGetUserIDByName when user not found

virGetUserIDByName is documented as returning 1 if the username cannot be found. getpwnam_r is documented as returning: « 0 or ENOENT or ESRCH or EBADF or EPERM or ... The given name or uid was not found. » and that: « The formulation given above under "RETURN VALUE" is from POSIX.1-2001. It does not call "not found" an error, hence does not specify what value errno might have in this situation. But that makes it impossible to recognize errors. One might argue that according to POSIX errno should be left unchanged if an entry is not found. Experiments on various UNIX-like systems shows that lots of different values occur in this situation: 0, ENOENT, EBADF, ESRCH, EWOULDBLOCK, EPERM and probably others. » virGetUserIDByName returns an error when the return value of getpwnam_r is non-0. However on my RHEL system, getpwnam_r returns ENOENT when the requested user cannot be found, which then causes virGetUserID not to behave as documented (it returns an error instead of falling back to parsing the passed-in value as an uid). This commit makes virGetUserIDByName ignore the various values listed in getpwnam_r manpage and return a 'user not found' result in such cases. --- src/util/util.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/src/util/util.c b/src/util/util.c index 2fd0f2c..df1af7e 100644 --- a/src/util/util.c +++ b/src/util/util.c @@ -2530,7 +2530,8 @@ virGetUserIDByName(const char *name, uid_t *uid) } } - if (rc != 0) { + if ((rc != 0) && (rc != ENOENT) && (rc != ESRCH) + && (rc != EBADF) && (rc != EPERM)) { virReportSystemError(rc, _("Failed to get user record for name '%s'"), name); goto cleanup; -- 1.8.0.1