On Tue, 17 Jan 2017, James Cowgill wrote:
I'm not sure I follow. Debhelper runs the testsuite during the build
target so it shouldn't be run as root anyway. I don't think you need any
workarounds at all for this.
I agree in terms of principles :), but I don't know what actually happens
on the buildd machines.
I've looked a bit at buildd.debian.org, but it's not completely
trivial to decide which is correct - do the buildd builds on the
debian build machines run dh_auto_tests as (i) root, as (ii) an unprivileged
user running fakeroot, or as (iii) an unprivileged user?
Looking at git://git.debian.org/buildd-tools/sbuild.git it looks like
the user is "buildd" - but this is just a guess.
The mpirun exit-if-root mechanism is in
openmpi-2.0.2~git.20161225/orte/orted/orted_submit.c
Isolating this to lines 319-335, this is easy to test as a standalone
main program (see snippet.c below) - the exit-if-root test is triggered either
(i) using
root directly, or (ii) as ordinary user running fakeroot.
Even as fakeroot, both geteuid() and getuid() in the snippet below
report an identity of 0.
My own pbuilder setup - closely following the maint-guide.en.txt advice -
appears *not* to run "make check" as fakeroot or root, since I
do not see the error and exit due to running as root.
The snippet below can be tested:
user$ ./snippet
user$ fakeroot ./snippet
root# ./snippet
Cheers
Boud
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/* inspired by openmpi-2.0.2~git.20161225/orte/orted/orted_submit.c root
detection */
/* (C) 2017 GPL-3+ B. Roukema if copyright is needed */
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
int main(void)
{
int uid = 77 , euid = 7777;
euid = geteuid();
uid = getuid();
if (0 == euid){
printf("WARNING: You are effectively root.\n");
};
if (0 == uid){
printf("WARNING: You are really root.\n");
};
if (0 != uid && 0 != euid){
printf("You are not running as root :).\n");
}
return 0;
}
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