[pbs-devel] [PATCH proxmox-backup] fix #4483: fix `task log` command interrupt handling

["Fabian Grünbichler" <f.gruenbichler@proxmox.com>]

`proxmox-backup-client task log ..` and `proxmox-backup-manager task log ..`
are used to view the logs of tasks that have been started by another client, so
interrupting the task progress view should not forward the interrupt to the
running task. other call sites of the same helper(s) that spawn a task and then
print its progress should keep the old behaviour of interrupting the spawned
task on C^c.

Signed-off-by: Fabian Grünbichler <f.gruenbichler@proxmox.com>
---
 pbs-client/src/task_log.rs        | 26 +++++++++++++++++---------
 proxmox-backup-client/src/task.rs |  2 +-
 src/bin/proxmox-backup-manager.rs |  2 +-
 3 files changed, 19 insertions(+), 11 deletions(-)

diff --git a/pbs-client/src/task_log.rs b/pbs-client/src/task_log.rs
index 960653de..372d63df 100644
--- a/pbs-client/src/task_log.rs
+++ b/pbs-client/src/task_log.rs
@@ -17,13 +17,14 @@ use super::HttpClient;
 /// Display task log on console
 ///
 /// This polls the task API and prints the log to the console. It also
-/// catches interrupt signals, and sends a abort request to the task if
-/// the user presses CTRL-C. Two interrupts cause an immediate end of
-/// the loop. The task may still run in that case.
+/// catches interrupt signals, and sends an abort request to the task if the
+/// user presses CTRL-C and `forward_interrupt` is true. Two interrupts cause an
+/// immediate end of the loop. The task may still run in that case.
 pub async fn display_task_log(
     client: &HttpClient,
     upid_str: &str,
     strip_date: bool,
+    forward_interrupt: bool,
 ) -> Result<(), Error> {
     let mut signal_stream = signal(SignalKind::interrupt())?;
     let abort_count = Arc::new(AtomicUsize::new(0));
@@ -48,11 +49,15 @@ pub async fn display_task_log(
         loop {
             let abort = abort_count.load(Ordering::Relaxed);
             if abort > 0 {
-                let path = format!(
-                    "api2/json/nodes/localhost/tasks/{}",
-                    percent_encode_component(upid_str)
-                );
-                let _ = client.delete(&path, None).await?;
+                if forward_interrupt {
+                    let path = format!(
+                        "api2/json/nodes/localhost/tasks/{}",
+                        percent_encode_component(upid_str)
+                    );
+                    let _ = client.delete(&path, None).await?;
+                } else {
+                    return Ok(());
+                }
             }
 
             let param = json!({ "start": start, "limit": limit, "test-status": true });
@@ -111,6 +116,9 @@ pub async fn display_task_log(
 }
 
 /// Display task result (upid), or view task log - depending on output format
+///
+/// In case of a task log of a running task, this will forward interrupt signals
+/// to the task and potentially abort it!
 pub async fn view_task_result(
     client: &HttpClient,
     result: Value,
@@ -119,7 +127,7 @@ pub async fn view_task_result(
     let data = &result["data"];
     if output_format == "text" {
         if let Some(upid) = data.as_str() {
-            display_task_log(client, upid, true).await?;
+            display_task_log(client, upid, true, true).await?;
         }
     } else {
         format_and_print_result(data, output_format);
diff --git a/proxmox-backup-client/src/task.rs b/proxmox-backup-client/src/task.rs
index 94c879a8..472db086 100644
--- a/proxmox-backup-client/src/task.rs
+++ b/proxmox-backup-client/src/task.rs
@@ -104,7 +104,7 @@ async fn task_log(param: Value) -> Result<Value, Error> {
 
     let client = connect(&repo)?;
 
-    display_task_log(&client, upid, true).await?;
+    display_task_log(&client, upid, true, false).await?;
 
     Ok(Value::Null)
 }
diff --git a/src/bin/proxmox-backup-manager.rs b/src/bin/proxmox-backup-manager.rs
index 06330c78..f084af31 100644
--- a/src/bin/proxmox-backup-manager.rs
+++ b/src/bin/proxmox-backup-manager.rs
@@ -189,7 +189,7 @@ async fn task_log(param: Value) -> Result<Value, Error> {
 
     let client = connect_to_localhost()?;
 
-    display_task_log(&client, upid, true).await?;
+    display_task_log(&client, upid, true, false).await?;
 
     Ok(Value::Null)
 }
-- 
2.30.2