Pre-refresh hook fails: SNAP_ARCH not set → broken LD_LIBRARY_PATH → mongod cannot find libcrypto.so.1.1

Hey there,
so, the following bug report is done by AI, I am not sure, if this is completely correct or not, nor do i have the expertise to judge this. If you deem this wrong, please just delete it and accept my apologies.

I've encountered this error, when I tried to so snap refresh on revision 1785.
[ERROR] pre refresh migration script /snap/rocketchat-server/1785/migrations/pre_refresh/feature_compatibility/00-adopt_version.sh

My workaround was to ignore-errors

snap set rocketchat-server ignore-errors=true
snap refresh rocketchat-server 
snap set rocketchat-server ignore-errors=false

Also, there is a typo in 00-adopt_version.sh: stop_monngod → stop_mongod.

Best
inDane

---

AI output begins here:

Bug Description

The pre-refresh hook fails during snap refresh because SNAP_ARCH is not set in the hook environment, causing environment.sh to build a broken LD_LIBRARY_PATH with empty architecture segments (e.g. /lib/-linux-gnu instead of /lib/x86_64-linux-gnu). This prevents mongod from finding bundled shared libraries like libcrypto.so.1.1.

Steps to Reproduce

1. Install rocketchat-server snap (tested on revision 1785)
2. Run sudo snap refresh rocketchat-server on Ubuntu 24.04 / snapd 2.75.2
3. Pre-refresh hook fails with:

[ERROR] pre refresh migration script /snap/rocketchat-server/1785/migrations/pre_refresh/feature_compatibility/00-adopt_version.sh

4. Running the migration script manually with proper env vars shows the real error:

mongod: error while loading shared libraries: libcrypto.so.1.1: cannot open shared object file: No such file or directory

Root Cause

helpers/environment.sh line 6:

export LD_LIBRARY_PATH="$LD_LIBRARY_PATH:$SNAP/lib:$SNAP/usr/lib:$SNAP/lib/${ARCH[$SNAP_ARCH]}-linux-gnu:$SNAP/usr/lib/${ARCH[$SNAP_ARCH]}-linux-gnu"

When SNAP_ARCH is empty (not set by snapd in the hook context), ${ARCH[$SNAP_ARCH]} returns empty, producing paths like:

/snap/rocketchat-server/1785/lib/-linux-gnu
/snap/rocketchat-server/1785/usr/lib/-linux-gnu

Instead of the correct:

/snap/rocketchat-server/1785/lib/x86_64-linux-gnu
/snap/rocketchat-server/1785/usr/lib/x86_64-linux-gnu

The library libcrypto.so.1.1 exists at the correct path (/snap/rocketchat-server/1785/usr/lib/x86_64-linux-gnu/libcrypto.so.1.1) but is never found because LD_LIBRARY_PATH points to non-existent directories.

Additional Issue: Typo in migration script

snap/rocketchat-server/1785/migrations/pre_refresh/feature_compatibility/00-adopt_version.sh line 8 contains:

is_mongod_running && stop_monngod

Three n characters (stop_monngod instead of stop_mongod). This causes a "command not found" error and a non-zero exit code.

Workaround

sudo snap set rocketchat-server ignore-errors=true
sudo snap refresh rocketchat-server
sudo snap set rocketchat-server ignore-errors=false

Or stop services before refreshing:

sudo systemctl stop snap.rocketchat-server.rocketchat-server
sudo systemctl stop snap.rocketchat-server.rocketchat-mongo
sudo snap refresh rocketchat-server

Suggested Fix

In helpers/environment.sh, add a fallback for SNAP_ARCH:

if [[ -z "${SNAP_ARCH:-}" ]]; then
    SNAP_ARCH=$(dpkg --print-architecture 2>/dev/null || echo "amd64")
fi

And fix the typo in 00-adopt_version.sh: stop_monngod → stop_mongod.

Environment

• OS: Ubuntu 24.04 LTS
• Kernel: 6.8.0-124-generic
• snapd: 2.75.2+ubuntu24.04
• Architecture: amd64
• Rocket.Chat snap: revision 1785 → 1788
• MongoDB: 7.0 (bundled)
• OpenSSL: 3.0.13 (system), 1.1 (bundled in snap)

Start with helpers/environment.sh and migrations/pre_refresh/feature_compatibility/00-adopt_version.sh. Reproduce the pre-refresh failure using the stated snap revision and environment, then inspect how SNAP_ARCH builds LD_LIBRARY_PATH and verify the migration script typo. Done means snap refresh no longer fails because the bundled libcrypto cannot be found, and the migration command uses the intended function name.