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Fix random client failures during GC server shutdown

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We need to close the GC server socket before shutting down the active
GC client connections, otherwise a client may (re)connect and get
ECONNRESET. But also handle ECONNRESET for resilience.

Fixes random failures like

  GC socket disconnected
  connecting to '/tmp/nix-shell.y07M0H/nix-test/default/var/nix/gc-socket/socket'
  sending GC root '/tmp/nix-shell.y07M0H/nix-test/default/store/kb5yzija0f1x5xkqkgclrdzldxj6nnc6-non-blocking'
  reading GC root from client: error: unexpected EOF reading a line
  1 store paths deleted, 0.00 MiB freed
  error: reading from file: Connection reset by peer

in gc-non-blocking.sh.
This commit is contained in:
Eelco Dolstra 2022-11-27 12:57:18 +01:00
parent 534332c8a0
commit 5b798f6cae
1 changed files with 2 additions and 1 deletions
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3
src/libstore/gc.cc
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@ -147,7 +147,7 @@ void LocalStore::addTempRoot(const StorePath & path)
} catch (SysError & e) {
/* The garbage collector may have exited, so we need to
restart. */
if (e.errNo == EPIPE) {
if (e.errNo == EPIPE || e.errNo == ECONNRESET) {
debug("GC socket disconnected");
state->fdRootsSocket.close();
goto restart;
@ -506,6 +506,7 @@ void LocalStore::collectGarbage(const GCOptions & options, GCResults & results)
Finally cleanup([&]() {
debug("GC roots server shutting down");
fdServer.close();
while (true) {
auto item = remove_begin(*connections.lock());
if (!item) break;