The CGI Howto page contains some basic information on how Apache
actually runs a program, but is there any more detailed information
anywhere?
Specifically, I have a problem where a bash script runs as expected when
run from an interactive shell by user www-data (this is Ubuntu).
However, the script behaves differently when run via Apache from a web
client. This is nothing to do with PATH or envvar differences: when run
by Apache, an operation to unmount a disk appears to succeed, but
actually doesn't unmount the disk. When run from the interactive shell,
as the same user, the operation unmounts the disk.
This is a basic Apache install on Ubuntu 22.04 - no suexec, no chroot,
plain CGI, etc. I've been running scripts via Apache this way for years,
but this is the first script which attempts to carry out disk
operations. All these scripts appear in the sudoers file to allow Apache
to carry out specific privileged operations.
I asked this question <https://unix.stackexchange.com/q/767587/212513>
today on StackExchange (https://unix.stackexchange.com/q/767587/212513,
if the link is scrubbed), with much more detail, but I think that was
probably the wrong place to ask.
Thanks.
- [users@httpd] Script behaving differently when run by Apache... EML
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