contrib/chg/procutil.h

sslutil: check for missing certificate and key files (issue5598)

Currently, sslutil._hostsettings() performs validation that web.cacerts
exists. However, client certificates are passed in to the function
and not all callers may validate them. This includes
httpconnection.readauthforuri(), which loads the [auth] section.

If a missing file is specified, the ssl module will raise a generic
IOException. And, it doesn't even give us the courtesy of telling
us which file is missing! Mercurial then prints a generic
"abort: No such file or directory" (or similar) error, leaving users
to scratch their head as to what file is missing.

This commit introduces explicit validation of all paths passed as
arguments to wrapsocket() and wrapserversocket(). Any missing file
is alerted about explicitly.

We should probably catch missing files earlier - as part of loading
the [auth] section. However, I think the sslutil functions should
check for file presence regardless of what callers do because that's
the only way to be sure that missing files are always detected.

/*
 * Utilities about process handling - signal and subprocess (ex. pager)
 *
 * Copyright (c) 2011 Yuya Nishihara <[e-mail]>
 *
 * This software may be used and distributed according to the terms of the
 * GNU General Public License version 2 or any later version.
 */

#ifndef PROCUTIL_H_
#define PROCUTIL_H_

#include <unistd.h>

void restoresignalhandler(void);
void setupsignalhandler(pid_t pid, pid_t pgid);

pid_t setuppager(const char *pagercmd, const char *envp[]);
void waitpager(void);

#endif /* PROCUTIL_H_ */