env variable is not defined when running rpmbuild --rebuild
On Mon, Aug 11, 2008 at 8:17 PM, Bob Proulx <email@example.com> wrote:
> Erez Zilber wrote:
>> before running rpmbuild, I run the following commands:
>> [erez.zilber@klab002:~/work/]$ sudo bash -c 'export MY_ENV_VAR=some_val'
> This has no effect because in Unix and Unix-like systems every process
> starts with a copy of the current environment and at the termination
> of the program the copied environment for that program is reclaimed by
> the system.
> In the above you are spawning a new environment for the 'sudo'
> command. That is spawning a new environment for the 'bash' command.
> In the bash process the environment variable is being set. That is
> the entirety of the bash script and the bash process terminates at
> that point. The system frees and reclaims all of the process memory
> associated with the bash process including all environment memory
> space. The sudo command has been waiting for the bash process to
> exit. It observes the program exit code and then the sudo process
> itself exits. When the sudo process exits the process memory
> including all environment memory is freed and reclaimed by the
>> [erez.zilber@klab002:~/work/]$ sudo echo $MY_ENV_VAR
> This is because you have already set MY_ENV_VAR in the parent
> environment. The $MY_ENV_VAR is expanded by the shell before it
> invokes the sudo. The sudo then invokes echo with the some_val
> argument. Try this for comparison:
> $ echo debug: sudo echo $MY_ENV_VAR
> debug: sudo echo some_val
> The $MY_ENV_VAR will already have been expanded by the original
> invoking command line shell.
>> In the spec file, I print this env var:
>> echo "MY_ENV_VAR = $MY_ENV_VAR"
>> but when I run rpmbuild --rebuild
>> /usr/src/redhat/SRPMS/mypackage-0-0.1.src.rpm, I get:
>> + LANG=C
>> + export LANG
>> + unset DISPLAY
>> + echo 'MY_ENV_VAR = '
>> MY_ENV_VAR =
>> I guess that it opens another shell in which the env var is not
>> defined. How can I solve that (without adding the env var to .bashrc
>> which is not a possible solution for me).
> Export the variable in the parent environment. It will then be
> inhereted by the child environments.
> Either for the specific command:
> $ MY_ENV_VAR=some_val rpmbuild --rebuild mypackage-0-0.1.src.rpm
> $ export MY_ENV_VAR=some_val
> $ rpmbuild --rebuild mypackage-0-0.1.src.rpm
> Note that it is dangerous to use sudo to build rpm packages. This
> causes the build to run as root. You don't want to do that. The
> wisdom of thet 'net is that this should be avoided. Package building
> should be done as a non-privileged user.
Thanks! That was very helpful.
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