From 895db38e2a2d7b48553f1875a90ac12381b34453 Mon Sep 17 00:00:00 2001
From: Filip Pytloun <filip@pytloun.cz>
Date: Thu, 20 Apr 2023 09:32:42 +0200
Subject: [PATCH] Run restic unlock before backup, fix shellcheck

---
 backup.sh | 46 +++++++++++++++++++++++++++++++++++-----------
 1 file changed, 35 insertions(+), 11 deletions(-)
 mode change 100644 => 100755 backup.sh

diff --git a/backup.sh b/backup.sh
old mode 100644
new mode 100755
index 79fe8ec..07b38e6
--- a/backup.sh
+++ b/backup.sh
@@ -1,34 +1,58 @@
 #!/bin/sh -e
 
 BACKUP_PATH=${BACKUP_PATH:-$1}
-INSTANCE="$(echo ${INSTANCE:-${TAG}} | envsubst)"
+INSTANCE="$(echo "${INSTANCE:-${TAG}}" | envsubst)"
 KEEP_ARGS=${KEEP_ARGS:-"--keep-hourly 12 --keep-daily 7 --keep-monthly 3"}
-export RESTIC_REPOSITORY="$(echo ${RESTIC_REPOSITORY} | envsubst)"
+RESTIC_REPOSITORY="$(echo "${RESTIC_REPOSITORY}" | envsubst)"
+export RESTIC_REPOSITORY
 
-echo -n > /tmp/metrics
+PUSHGATEWAY_URL=${PUSHGATEWAY_URL:-"http://prometheus-pushgateway.monitoring.svc.cluster.local:9091"}
+
+log_info() {
+    echo "[INFO] $*"
+}
+
+log_warn() {
+    echo "[WARN] $*" >&2
+}
+
+echo > /tmp/metrics
 ts_start=$(date +%s)
 
+log_info "Initializing restic"
 ts=$(date +%s)
-restic cat config >/dev/null || restic init
+restic cat config >/dev/null || {
+    log_warn "Repository ${RESTIC_REPOSITORY} does not exist, creating";
+    restic init;
+}
 echo "restic_init_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics
 
+log_info "Cleaning stale locks"
 ts=$(date +%s)
-restic backup --verbose --tag ${TAG} ${BACKUP_PATH}
+restic unlock
+echo "restic_unlock_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics
+
+log_info "Running restic backup"
+ts=$(date +%s)
+restic backup --verbose --tag "${TAG}" "${BACKUP_PATH}"
 echo "restic_backup_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics
 
+log_info "Cleaning up old snapshots"
 ts=$(date +%s)
-restic forget --prune --tag ${TAG} -g paths,tags ${KEEP_ARGS}
+restic forget --prune --tag "${TAG}" -g paths,tags "${KEEP_ARGS}"
 echo "restic_forget_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics
 
 
 # Metrics
+log_info "Collecting metrics"
 ts=$(date +%s)
-restic stats --json latest > /tmp/stats.json
-restic snapshots --json latest > /tmp/snapshots.json
+restic stats --json latest | tee /tmp/stats.json
+restic snapshots --json latest | tee /tmp/snapshots.json
 echo "restic_stats_duration $(echo "$(date +%s) - $ts" | bc)" >> /tmp/metrics
 
 echo "restic_total_duration $(echo "$(date +%s) - $ts_start" | bc)" >> /tmp/metrics
 
-cat /tmp/stats.json | jq -r '"restic_stats_total_size_bytes \(.total_size)\nrestic_stats_total_file_count \(.total_file_count)"' >> /tmp/metrics
-cat /tmp/snapshots.json | jq -r 'max_by(.time) | .time | sub(".[0-9]+Z$"; "Z") | fromdate | "restic_stats_last_snapshot_timestamp \(.)"' >> /tmp/metrics
-cat /tmp/metrics | curl --data-binary @- "http://prometheus-pushgateway.monitoring.svc.cluster.local:9091/metrics/job/backup/instance/${INSTANCE}"
+log_info "Sending metrics to pushgateway"
+jq -r '"restic_stats_total_size_bytes \(.total_size)\nrestic_stats_total_file_count \(.total_file_count)"' < /tmp/stats.json >> /tmp/metrics
+jq -r 'max_by(.time) | .time | sub(".[0-9]+Z$"; "Z") | fromdate | "restic_stats_last_snapshot_timestamp \(.)"' < /tmp/snapshots.json >> /tmp/metrics
+curl --data-binary @- "${PUSHGATEWAY_URL}/metrics/job/backup/instance/${INSTANCE}" < /tmp/metrics