Initial portable pretranscode service

2026-08-26 09:53:42 +10:00
commit 093315b382
11 changed files with 1077 additions and 0 deletions
@@ -0,0 +1,42 @@
+#!/bin/bash
+set -euo pipefail
+
+[ "${EUID}" -eq 0 ] || { echo "Run as root." >&2; exit 1; }
+ENV_FILE=${1:-.env}
+[ -f "$ENV_FILE" ] || { echo "Missing $ENV_FILE" >&2; exit 1; }
+set -a
+. "$ENV_FILE"
+set +a
+
+: "${PRETRANSCODE_ROOT:?}"
+: "${PRETRANSCODE_VIEW_PATH:?}"
+: "${PRETRANSCODE_CACHE_PATH:?}"
+: "${PRETRANSCODE_STATE_PATH:?}"
+: "${PRETRANSCODE_CACHE_IMAGE:?}"
+: "${CACHE_MAX_BYTES:?}"
+: "${PRETRANSCODE_UID:?}"
+: "${PRETRANSCODE_GID:?}"
+
+mkdir -p "$PRETRANSCODE_ROOT" "$PRETRANSCODE_VIEW_PATH" \
+  "$PRETRANSCODE_CACHE_PATH" "$PRETRANSCODE_STATE_PATH"
+
+if [ ! -f "$PRETRANSCODE_CACHE_IMAGE" ]; then
+  fallocate -l "$CACHE_MAX_BYTES" "$PRETRANSCODE_CACHE_IMAGE"
+  mkfs.ext4 -q -F -m 0 -L pretranscode "$PRETRANSCODE_CACHE_IMAGE"
+  # mkfs may discard unused extents; claim the configured allocation again.
+  fallocate -l "$CACHE_MAX_BYTES" "$PRETRANSCODE_CACHE_IMAGE"
+elif [ "$(stat -c %s "$PRETRANSCODE_CACHE_IMAGE")" -ne "$CACHE_MAX_BYTES" ]; then
+  echo "Cache image exists with a different size; resize it explicitly before provisioning." >&2
+  exit 1
+fi
+
+FSTAB_LINE="$PRETRANSCODE_CACHE_IMAGE $PRETRANSCODE_CACHE_PATH ext4 loop,nofail,noatime 0 2"
+grep -qF "$FSTAB_LINE" /etc/fstab || echo "$FSTAB_LINE" >> /etc/fstab
+mountpoint -q "$PRETRANSCODE_CACHE_PATH" || mount "$PRETRANSCODE_CACHE_PATH"
+touch "$PRETRANSCODE_CACHE_PATH/.pretranscode-cache"
+chown -R "$PRETRANSCODE_UID:$PRETRANSCODE_GID" \
+  "$PRETRANSCODE_VIEW_PATH" "$PRETRANSCODE_STATE_PATH" "$PRETRANSCODE_CACHE_PATH"
+chmod 0755 "$PRETRANSCODE_VIEW_PATH" "$PRETRANSCODE_STATE_PATH" "$PRETRANSCODE_CACHE_PATH"
+
+echo "Cache provisioned at $PRETRANSCODE_CACHE_PATH"
+df -h "$PRETRANSCODE_CACHE_PATH"