Merge pull request #21051 from poettering/nspawn-no-sync

nspawn: add --suppress-sync=yes mode for turning sync() and friends i…
2021-10-20 22:42:43 +09:00
parent b78524f48d 4a4654e024
commit 241167e68a
9 changed files with 167 additions and 5 deletions
@@ -138,6 +138,12 @@ All tools:
 * `$SYSTEMD_NSPAWN_TMPFS_TMP=0` — if set, do not overmount `/tmp/` in the
  container with a tmpfs, but leave the directory from the image in place.

+* `$SYSTEMD_SUPPRESS_SYNC=1` — if set, all disk synchronization syscalls are
+  blocked to the container payload (e.g. `sync()`, `fsync()`, `syncfs()`, …)
+  and the `O_SYNC`/`O_DSYNC` flags are made unavailable to `open()` and
+  friends. This is equivalent to passing `--suppress-sync=yes` on the
+  `systemd-nspawn` command line.
+
 `systemd-logind`:

 * `$SYSTEMD_BYPASS_HIBERNATION_MEMORY_CHECK=1` — if set, report that