Merge "Fix the run-as environment to better match su."

#include <dirent.h>

#include <errno.h>

#include <paths.h>

#include <pwd.h>

#include <stdarg.h>

#include <stdio.h>

#include <stdlib.h>

        panic("Could not set SELinux security context: %s\n", strerror(errno));

    }

    /* cd into the data directory */

    // cd into the data directory, and set $HOME correspondingly.

    if (TEMP_FAILURE_RETRY(chdir(info.dataDir)) < 0) {

        panic("Could not cd to package's data directory: %s\n", strerror(errno));

    }

    setenv("HOME", info.dataDir, 1);

    // Reset parts of the environment, like su would.

    setenv("PATH", _PATH_DEFPATH, 1);

    unsetenv("IFS");

    // Set the user-specific parts for this user.

    struct passwd* pw = getpwuid(uid);

    setenv("LOGNAME", pw->pw_name, 1);

    setenv("SHELL", pw->pw_shell, 1);

    setenv("USER", pw->pw_name, 1);

    /* User specified command for exec. */

    if ((argc >= commandArgvOfs + 1) &&