base: add SNMP module.

Over time, several SNMP device support have been implemented, most (or
all) of them derived from DESY's implementation, including one from
Sheng Peng, Diamond's and NSCL/FRIB. By 2013, most were willing to test
NSCL/FRIB's implementation or to switch to it [1]. Advantages by then
were:

- no memory leak (opposed to Sheng Peng's implementation)
- easier to work with (compared to original DESY implementation)
- supports SNMP writes (compared to Sheng's)
- depends more heavily on libsnmp (compared to Diamond's implementation)

Nowadays, Sheng Peng's implementation seems not to be developed anymore,
as well as Diamond's. From all forks, NSCL/FRIB and SLAC are still
around [2]. Between the two, slac-epics/snmp has been preferred over
NSCL/FRIB module [3] (also forked in slac-epics/epics-snmp [4]) to be
used here due to:

- more record types being supported by the device support, including
  mbbo [5, 6], which is interesting for our IOCs;
- its simpler repository structure and configuration, which can be
  easily integrated in our build system.

Changing from one implementation to the other is a matter of changing
the record DTYP used and restricting to the subset of supported record
types. Beyond that, record API is the same. Therefore, changing the
implementation in the future does have costs, but it should not be very
high.

Co-authored-by: Henrique F. Simoes <henrique.simoes@lnls.br>

[1]: https://epics.anl.gov/tech-talk/2013/msg00537.php
[2]: https://epics.anl.gov/tech-talk/2024/msg00889.php
[3]: https://groups.nscl.msu.edu/controls/files/devSnmp.html
[4]: https://github.com/slac-epics/epics-snmp
[5]: https://github.com/slac-epics/snmp/blob/134fbfd91ac83974730093330781cd1217017382/devSnmpApp/src/devSnmp.dbd
[6]: https://github.com/slac-epics/epics-snmp/blob/12a9cfa7b5b07bee17ae8ba7a74b460dd72811e6/snmpApp/src/devSnmp.dbd

base/.env

@@ -19,6 +19,7 @@ ETHER_IP_VERSION=ether_ip-3-3
 IOCSTATS_VERSION=3.2.0
 IPMICOMM_VERSION=R4.6.0
 PYDEVSUP_VERSION=1.2
+SNMP_VERSION=1.1.0.4
 
 AREA_DETECTOR_VERSION=R3-12-1
 NDSSCPIMEGA_VERSION=1.0.0

base/Dockerfile

@@ -17,6 +17,7 @@ RUN apt update -y && \
         libtiff-dev \
         libusb-1.0-0-dev \
         libxml2-dev \
+        libsnmp-dev \
         libssl-dev \
         re2c \
         unzip \
@@ -58,6 +59,7 @@ ARG ETHER_IP_VERSION
 ARG IOCSTATS_VERSION
 ARG IPMICOMM_VERSION
 ARG PYDEVSUP_VERSION
+ARG SNMP_VERSION
 
 COPY ipmicomm.patch .
 COPY caputlog-waveform-fix.patch .

base/docker-compose.yml

@@ -28,6 +28,7 @@ services:
         IOCSTATS_VERSION: ${IOCSTATS_VERSION}
         IPMICOMM_VERSION: ${IPMICOMM_VERSION}
         PYDEVSUP_VERSION: ${PYDEVSUP_VERSION}
+        SNMP_VERSION: ${SNMP_VERSION}
         AREA_DETECTOR_VERSION: ${AREA_DETECTOR_VERSION}
         NDSSCPIMEGA_VERSION: ${NDSSCPIMEGA_VERSION}
         LIBSSCPIMEGA_VERSION: ${LIBSSCPIMEGA_VERSION}

base/install_modules.sh

@@ -81,3 +81,9 @@ echo PYTHON=python3 >> pyDevSup/configure/CONFIG_SITE
 install_module pyDevSup PYDEVSUP "
 EPICS_BASE
 "
+
+lnls-get-n-unpack -l https://groups.nscl.msu.edu/controls/files/epics-snmp-$SNMP_VERSION.zip
+mv epics-snmp-$SNMP_VERSION snmp
+install_module -i snmp SNMP "
+EPICS_BASE
+"

base/musl/Dockerfile

@@ -15,6 +15,7 @@ RUN apk add --no-cache \
     make \
     musl-dev \
     ncurses-terminfo \
+    net-snmp-dev \
     patch \
     perl \
     rpcsvc-proto \
@@ -57,6 +58,7 @@ ARG ETHER_IP_VERSION
 ARG IOCSTATS_VERSION
 ARG IPMICOMM_VERSION
 ARG PYDEVSUP_VERSION
+ARG SNMP_VERSION
 
 WORKDIR ${EPICS_MODULES_PATH}
 COPY ipmicomm.patch .

base/musl/docker-compose.yml

@@ -28,3 +28,4 @@ services:
         IOCSTATS_VERSION: ${IOCSTATS_VERSION}
         IPMICOMM_VERSION: ${IPMICOMM_VERSION}
         PYDEVSUP_VERSION: ${PYDEVSUP_VERSION}
+        SNMP_VERSION: ${SNMP_VERSION}