CBL-Mariner/SPECS/systemd-bootstrap/gpt-auto-devno-not-determin...

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From d5cb053cd93d516f516e0b748271b55f9dfb3a29 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Mon, 14 Feb 2022 13:35:27 +0100
Subject: [PATCH 1/2] gpt-auto: properly handle case where we can't determine
devno of /usr/ fs
get_block_device_harder() returns == 0 if the fs is valid, but it is not
backed by a single devno. (As opposed to returning > 0 if the devno is
valid). Let's catch this case and log a clear message, and don't bother
open the device in that case.
This is mostly cosmetical, as either way, systemd-gpt-auto-generator
doesn't work in scenarios like that.
Prompted-by: #22504
---
src/gpt-auto-generator/gpt-auto-generator.c | 8 ++++++--
1 file changed, 6 insertions(+), 2 deletions(-)
diff --git a/src/gpt-auto-generator/gpt-auto-generator.c b/src/gpt-auto-generator/gpt-auto-generator.c
index 64ca9bb2f9..28982a4c34 100644
--- a/src/gpt-auto-generator/gpt-auto-generator.c
+++ b/src/gpt-auto-generator/gpt-auto-generator.c
@@ -779,12 +779,16 @@ static int add_mounts(void) {
return btrfs_log_dev_root(LOG_ERR, r, "root file system");
if (r < 0)
return log_error_errno(r, "Failed to determine block device of root file system: %m");
- if (r == 0) { /* Not backed by block device */
+ if (r == 0) { /* Not backed by a single block device. (Could be NFS or so, or could be multi-device RAID or so) */
r = get_block_device_harder("/usr", &devno);
if (r == -EUCLEAN)
return btrfs_log_dev_root(LOG_ERR, r, "/usr");
if (r < 0)
- return log_error_errno(r, "Failed to determine block device of /usr file system: %m");
+ return log_error_errno(r, "Failed to determine block device of /usr/ file system: %m");
+ if (r == 0) { /* /usr/ not backed by single block device, either. */
+ log_debug("Neither root nor /usr/ file system are on a (single) block device.");
+ return 0;
+ }
}
} else if (r < 0)
return log_error_errno(r, "Failed to read symlink /run/systemd/volatile-root: %m");
--
2.37.3