0001-partname-Introduce-fstools_partname_fallback_scan-op.patch

From 6a4d42ca87035666eb008095f18dc0657c98898e Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Sun, 22 Jan 2023 16:43:35 +0100
Subject: [PATCH] partname: Introduce fstools_partname_fallback_scan option

Some device may contains a GPT partition named rootfs_data that may
not be suitable.
To save from regression with old implementation that doesn't use
fstools_ignore_partname to explicitly say that that parname scan
should be ignored, make explicit that scanning each partition should
be done by providing fstools_partname_fallback_scan=1 and skip partname
scan in every other case.

Fixes: e9b59f063bb3 ("partname: Ignore root=PARTUUID...")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
---
 libfstools/partname.c | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/libfstools/partname.c b/libfstools/partname.c
index 9c27015..f42322a 100644
--- a/libfstools/partname.c
+++ b/libfstools/partname.c
@@ -133,6 +133,19 @@ static struct volume *partname_volume_find(char *name)
 		/* find partition on same device as rootfs */
 		snprintf(ueventgstr, sizeof(ueventgstr), "%s/%s/*/uevent", block_dir_name, rootdev);
 	} else {
+		/*
+		 * Some device may contains a GPT partition named rootfs_data that may not be suitable.
+		 * To save from regression with old implementation that doesn't use fstools_ignore_partname to
+		 * explicitly say that that parname scan should be ignored, make explicit that scanning each
+		 * partition should be done by providing fstools_partname_fallback_scan=1 and skip partname scan
+		 * in every other case.
+		 */
+		if (!get_var_from_file("/proc/cmdline", "fstools_partname_fallback_scan", rootparam, sizeof(rootparam)))
+			return NULL;
+
+		if (!strcmp("1", rootparam))
+			return NULL;
+
 		/* no useful 'root=' kernel cmdline parameter, find on any block device */
 		snprintf(ueventgstr, sizeof(ueventgstr), "%s/*/uevent", block_dir_name);
 	}
-- 
2.38.1