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// Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
/**
* small utility to use instead of "su" when we want to just
* switch to the vespa user without any more fuss
**/
int main(int argc, char** argv)
{
if (argc < 2) {
fprintf(stderr, "missing arguments, usage: vespa-run-as-vespa-user <cmd> [args ...]\n");
exit(1);
}
const char *username = getenv("VESPA_USER");
if (username == nullptr) {
username = "vespa";
}
struct passwd *p = getpwnam(username);
if (p == nullptr) {
fprintf(stderr, "FATAL error: user '%s' missing in passwd file\n", username);
exit(1);
}
gid_t g = p->pw_gid;
uid_t u = p->pw_uid;
gid_t oldg = getgid();
uid_t oldu = getuid();
if (g != oldg && setgid(g) != 0) {
perror("FATAL error: could not change group id");
exit(1);
}
size_t listsize = 1;
gid_t grouplist[1] = { g };
if ((g != oldg || u != oldu) && setgroups(listsize, grouplist) != 0) {
perror("FATAL error: could not setgroups");
exit(1);
}
if (u != oldu && setuid(u) != 0) {
perror("FATAL error: could not change user id");
exit(1);
}
execvp(argv[1], &argv[1]);
perror("FATAL error: execvp failed");
exit(1);
}
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