Add configurable disk usage threshold setting

Disk usage threshold (default 95%) can now be controlled from
Settings. Set to 0 to disable the check.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

lib/backup.sh

@@ -78,11 +78,14 @@ _backup_target_impl() {
             ;;
     esac
 
-    # 4.5. Check remote disk space (fail if >= 95%)
+    # 4.5. Check remote disk space
-    check_remote_disk_space 95 || {
+    local threshold="${DISK_USAGE_THRESHOLD:-$DEFAULT_DISK_USAGE_THRESHOLD}"
-        log_error "Remote '$remote_name' has insufficient disk space"
+    if [[ "$threshold" -gt 0 ]]; then
-        return 1
+        check_remote_disk_space "$threshold" || {
-    }
+            log_error "Remote '$remote_name' has insufficient disk space"
+            return 1
+        }
+    fi
 
     local start_time; start_time=$(date +%s)
 

lib/config.sh

@@ -54,6 +54,7 @@ load_config() {
     SSH_TIMEOUT="${SSH_TIMEOUT:-$DEFAULT_SSH_TIMEOUT}"
     SSH_RETRIES="${SSH_RETRIES:-$DEFAULT_SSH_RETRIES}"
     RSYNC_EXTRA_OPTS="${RSYNC_EXTRA_OPTS:-}"
+    DISK_USAGE_THRESHOLD="${DISK_USAGE_THRESHOLD:-$DEFAULT_DISK_USAGE_THRESHOLD}"
 
     # WORK_DIR can be overridden in config; re-export if changed
     export WORK_DIR
@@ -64,7 +65,7 @@ load_config() {
     export BACKUP_MODE BWLIMIT RETENTION_COUNT
     export LOG_LEVEL LOG_RETAIN NOTIFY_EMAIL NOTIFY_ON
     export SMTP_HOST SMTP_PORT SMTP_USER SMTP_FROM SMTP_SECURITY
-    export SSH_TIMEOUT SSH_RETRIES RSYNC_EXTRA_OPTS
+    export SSH_TIMEOUT SSH_RETRIES RSYNC_EXTRA_OPTS DISK_USAGE_THRESHOLD
 }
 
 validate_config() {

lib/constants.sh

@@ -48,3 +48,4 @@ readonly DEFAULT_REMOTE_TYPE="ssh"
 readonly DEFAULT_S3_REGION="us-east-1"
 readonly DEFAULT_SMTP_PORT=587
 readonly DEFAULT_SMTP_SECURITY="tls"
+readonly DEFAULT_DISK_USAGE_THRESHOLD=95

tui/models.py

@@ -205,6 +205,7 @@ class AppSettings:
     ssh_timeout: str = "30"
     ssh_retries: str = "3"
     rsync_extra_opts: str = ""
+    disk_usage_threshold: str = "95"
     work_dir: str = "/usr/local/gniza/workdir"
     web_port: str = "2323"
     web_host: str = "0.0.0.0"
@@ -229,6 +230,7 @@ class AppSettings:
             ssh_timeout=data.get("SSH_TIMEOUT", "30"),
             ssh_retries=data.get("SSH_RETRIES", "3"),
             rsync_extra_opts=data.get("RSYNC_EXTRA_OPTS", ""),
+            disk_usage_threshold=data.get("DISK_USAGE_THRESHOLD", "95"),
             work_dir=data.get("WORK_DIR", "/usr/local/gniza/workdir"),
             web_port=data.get("WEB_PORT", "8080"),
             web_host=data.get("WEB_HOST", "0.0.0.0"),
@@ -253,6 +255,7 @@ class AppSettings:
             "SSH_TIMEOUT": self.ssh_timeout,
             "SSH_RETRIES": self.ssh_retries,
             "RSYNC_EXTRA_OPTS": self.rsync_extra_opts,
+            "DISK_USAGE_THRESHOLD": self.disk_usage_threshold,
             "WORK_DIR": self.work_dir,
             "WEB_PORT": self.web_port,
             "WEB_HOST": self.web_host,

tui/screens/settings.py

@@ -29,6 +29,8 @@ class SettingsScreen(Screen):
             yield Input(value=settings.retention_count, id="set-retention")
             yield Static("Default Bandwidth Limit (KB/s, 0=unlimited):")
             yield Input(value=settings.bwlimit, id="set-bwlimit")
+            yield Static("Disk Usage Threshold (%, 0=disable):")
+            yield Input(value=settings.disk_usage_threshold, id="set-diskthreshold")
             yield Static("Notification Email:")
             yield Input(value=settings.notify_email, id="set-email")
             yield Static("Notify On:")
@@ -100,6 +102,7 @@ class SettingsScreen(Screen):
             ssh_timeout=self.query_one("#set-sshtimeout", Input).value.strip() or "30",
             ssh_retries=self.query_one("#set-sshretries", Input).value.strip() or "3",
             rsync_extra_opts=self.query_one("#set-rsyncopts", Input).value.strip(),
+            disk_usage_threshold=self.query_one("#set-diskthreshold", Input).value.strip() or "95",
             work_dir=self.query_one("#set-workdir", Input).value.strip() or "/usr/local/gniza/workdir",
             web_port=self.query_one("#set-web-port", Input).value.strip() or "8080",
             web_host=self.query_one("#set-web-host", Input).value.strip() or "0.0.0.0",