Allow setting MIBDIRS per generator module

[SuperQ]

A common source of problems generating snmp.yml configurations is that some MIBs produce conflicts. For example, SNMPv2-TC and RFC1213-MIB both define DisplayString. There are many such examples of these kinds of conflicts.

In order to work around this, we can allow each generator module config to include a mibdirs specification that will override the default MIBDIRS environment variable. This way each module can have an isolated instance of the net-snmp parsing.

[manjunathnayaka22]

Hi,
I am trying to generate snmp.yml by locating the IF-MIB.mib in local directory /usr/share/snmp/test_mib/
But getting following error.

~Error while running the generate
[root@testhost generator]# ./generator generate \

-m /usr/share/snmp/test_mib/
-g /root/snmp_exporter/generator/generator.yml
-o //root/snmp_exporter/generator/snmp.yml
time=2024-11-13T23:41:18.202-07:00 level=INFO source=/root/snmp_exporter/generator/net_snmp.go:173 msg="Loading MIBs" from=/usr/share/snmp/test_mib/
time=2024-11-13T23:41:18.204-07:00 level=WARN source=/root/snmp_exporter/generator/main.go:176 msg="NetSNMP reported parse error(s)" errors=205
time=2024-11-13T23:41:18.204-07:00 level=ERROR source=/root/snmp_exporter/generator/main.go:182 msg="Missing MIB" mib=SNMPv2-SMI from="At line 12 in /usr/share/snmp/test_mib//IF-MIB.mib"
time=2024-11-13T23:41:18.204-07:00 level=ERROR source=/root/snmp_exporter/generator/main.go:182 msg="Missing MIB" mib=SNMPv2-TC from="At line 15 in /usr/share/snmp/test_mib//IF-MIB.mib"
time=2024-11-13T23:41:18.204-07:00 level=ERROR source=/root/snmp_exporter/generator/main.go:182 msg="Missing MIB" mib=SNMPv2-MIB from="At line 18 in /usr/share/snmp/test_mib//IF-MIB.mib"
time=2024-11-13T23:41:18.204-07:00 level=ERROR source=/root/snmp_exporter/generator/main.go:182 msg="Missing MIB" mib=IANAifType-MIB from="At line 19 in /usr/share/snmp/test_mib//IF-MIB.mib"
time=2024-11-13T23:41:18.204-07:00 level=ERROR source=/root/snmp_exporter/generator/main.go:134 msg="Failing on reported parse error(s)" help="Use 'generator parse_errors' command to see errors, --no-fail-on-parse-errors to ignore"

Makefile
MIBDIR = mibs
MIB_PATH := '/usr/share/snmp/test_mib/'

CURL_OPTS ?= -L -s --retry 3 --retry-delay 3 --fail
CURL_USER_AGENT ?= -H "User-Agent: snmp_exporter generator"

REPO_TAG ?= $(shell git rev-parse --abbrev-ref HEAD)

DOCKER_IMAGE_NAME ?= snmp-generator
DOCKER_IMAGE_TAG ?= $(subst /,-,$(REPO_TAG))
DOCKER_REPO ?= prom

SANITIZED_DOCKER_IMAGE_TAG := $(subst +,-,$(DOCKER_IMAGE_TAG))

SELINUX_ENABLED := $(shell cat /sys/fs/selinux/enforce 2> /dev/null || echo 0)