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From 4c9eb27048c07b0cf93377344ddfe2f8980a88e4 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Thu, 1 Dec 2022 15:37:59 +0100
Subject: [PATCH] blkid-util: define enum for blkid_do_safeprobe() return
values
libblkid really should define an enum for this on its own, but it
currently doesn't and returns literal numeric values. Lets make this
more readable by adding our own symbolic names via an enum.
(cherry picked from commit 2e3944b872cf57dbccdda14ec66772e8fdd2273b)
Related: RHEL-16182
---
src/home/homework-luks.c | 16 ++++++++++------
src/partition/repart.c | 9 +++++----
src/shared/blkid-util.h | 10 ++++++++++
src/shared/dissect-image.c | 16 ++++++++++------
src/shared/find-esp.c | 10 ++++++----
5 files changed, 41 insertions(+), 20 deletions(-)
diff --git a/src/home/homework-luks.c b/src/home/homework-luks.c
index 53fa61b103..8795707f6e 100644
--- a/src/home/homework-luks.c
+++ b/src/home/homework-luks.c
@@ -148,10 +148,12 @@ static int probe_file_system_by_fd(
errno = 0;
r = blkid_do_safeprobe(b);
- if (IN_SET(r, -2, 1)) /* nothing found or ambiguous result */
+ if (r == _BLKID_SAFEPROBE_ERROR)
+ return errno_or_else(EIO);
+ if (IN_SET(r, _BLKID_SAFEPROBE_AMBIGUOUS, _BLKID_SAFEPROBE_NOT_FOUND))
return -ENOPKG;
- if (r != 0)
- return errno > 0 ? -errno : -EIO;
+
+ assert(r == _BLKID_SAFEPROBE_FOUND);
(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
if (!fstype)
@@ -665,10 +667,12 @@ static int luks_validate(
errno = 0;
r = blkid_do_safeprobe(b);
- if (IN_SET(r, -2, 1)) /* nothing found or ambiguous result */
+ if (r == _BLKID_SAFEPROBE_ERROR)
+ return errno_or_else(EIO);
+ if (IN_SET(r, _BLKID_SAFEPROBE_AMBIGUOUS, _BLKID_SAFEPROBE_NOT_FOUND))
return -ENOPKG;
- if (r != 0)
- return errno > 0 ? -errno : -EIO;
+
+ assert(r == _BLKID_SAFEPROBE_FOUND);
(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
if (streq_ptr(fstype, "crypto_LUKS")) {
diff --git a/src/partition/repart.c b/src/partition/repart.c
index 8875e09389..cbd900969e 100644
--- a/src/partition/repart.c
+++ b/src/partition/repart.c
@@ -4604,12 +4604,14 @@ static int resolve_copy_blocks_auto_candidate(
errno = 0;
r = blkid_do_safeprobe(b);
- if (IN_SET(r, -2, 1)) { /* nothing found or ambiguous result */
+ if (r == _BLKID_SAFEPROBE_ERROR)
+ return log_error_errno(errno_or_else(EIO), "Unable to probe for partition table of '%s': %m", p);
+ if (IN_SET(r, _BLKID_SAFEPROBE_AMBIGUOUS, _BLKID_SAFEPROBE_NOT_FOUND)) {
log_debug("Didn't find partition table on block device '%s'.", p);
return false;
}
- if (r != 0)
- return log_error_errno(errno_or_else(EIO), "Unable to probe for partition table of '%s': %m", p);
+
+ assert(r == _BLKID_SAFEPROBE_FOUND);
(void) blkid_probe_lookup_value(b, "PTTYPE", &pttype, NULL);
if (!streq_ptr(pttype, "gpt")) {
@@ -4621,7 +4623,6 @@ static int resolve_copy_blocks_auto_candidate(
pl = blkid_probe_get_partitions(b);
if (!pl)
return log_error_errno(errno_or_else(EIO), "Unable read partition table of '%s': %m", p);
- errno = 0;
pp = blkid_partlist_devno_to_partition(pl, partition_devno);
if (!pp) {
diff --git a/src/shared/blkid-util.h b/src/shared/blkid-util.h
index aa444990fd..5df39eccfc 100644
--- a/src/shared/blkid-util.h
+++ b/src/shared/blkid-util.h
@@ -7,4 +7,14 @@
# include "macro.h"
DEFINE_TRIVIAL_CLEANUP_FUNC_FULL(blkid_probe, blkid_free_probe, NULL);
+
+/* Define symbolic names for blkid_do_safeprobe() return values, since blkid only uses literal numbers. We
+ * prefix these symbolic definitions with underscores, to not invade libblkid's namespace needlessly. */
+enum {
+ _BLKID_SAFEPROBE_FOUND = 0,
+ _BLKID_SAFEPROBE_NOT_FOUND = 1,
+ _BLKID_SAFEPROBE_AMBIGUOUS = -2,
+ _BLKID_SAFEPROBE_ERROR = -1,
+};
+
#endif
diff --git a/src/shared/dissect-image.c b/src/shared/dissect-image.c
index d2abd5a087..7721769061 100644
--- a/src/shared/dissect-image.c
+++ b/src/shared/dissect-image.c
@@ -201,14 +201,16 @@ int probe_filesystem_full(int fd, const char *path, char **ret_fstype) {
errno = 0;
r = blkid_do_safeprobe(b);
- if (r == 1)
+ if (r == _BLKID_SAFEPROBE_NOT_FOUND)
goto not_found;
- if (r == -2)
+ if (r == _BLKID_SAFEPROBE_AMBIGUOUS)
return log_debug_errno(SYNTHETIC_ERRNO(EUCLEAN),
"Results ambiguous for partition %s", path);
- if (r != 0)
+ if (r == _BLKID_SAFEPROBE_ERROR)
return log_debug_errno(errno_or_else(EIO), "Failed to probe partition %s: %m", path);
+ assert(r == _BLKID_SAFEPROBE_FOUND);
+
(void) blkid_probe_lookup_value(b, "TYPE", &fstype, NULL);
if (fstype) {
@@ -506,10 +508,12 @@ static int dissect_image(
errno = 0;
r = blkid_do_safeprobe(b);
- if (IN_SET(r, -2, 1))
- return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
- if (r != 0)
+ if (r == _BLKID_SAFEPROBE_ERROR)
return errno_or_else(EIO);
+ if (IN_SET(r, _BLKID_SAFEPROBE_AMBIGUOUS, _BLKID_SAFEPROBE_NOT_FOUND))
+ return log_debug_errno(SYNTHETIC_ERRNO(ENOPKG), "Failed to identify any partition table.");
+
+ assert(r == _BLKID_SAFEPROBE_FOUND);
if ((!(flags & DISSECT_IMAGE_GPT_ONLY) &&
(flags & DISSECT_IMAGE_GENERIC_ROOT)) ||
diff --git a/src/shared/find-esp.c b/src/shared/find-esp.c
index fa234c8b5f..f005432887 100644
--- a/src/shared/find-esp.c
+++ b/src/shared/find-esp.c
@@ -571,12 +571,14 @@ static int verify_xbootldr_blkid(
errno = 0;
r = blkid_do_safeprobe(b);
- if (r == -2)
+ if (r == _BLKID_SAFEPROBE_AMBIGUOUS)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "%s: File system is ambiguous.", node);
- else if (r == 1)
+ if (r == _BLKID_SAFEPROBE_NOT_FOUND)
return log_error_errno(SYNTHETIC_ERRNO(ENODEV), "%s: File system does not contain a label.", node);
- else if (r != 0)
- return log_error_errno(errno ?: SYNTHETIC_ERRNO(EIO), "%s: Failed to probe file system: %m", node);
+ if (r == _BLKID_SAFEPROBE_ERROR)
+ return log_error_errno(errno_or_else(EIO), "%s: Failed to probe file system: %m", node);
+
+ assert(r == _BLKID_SAFEPROBE_FOUND);
r = blkid_probe_lookup_value(b, "PART_ENTRY_SCHEME", &type, NULL);
if (r != 0)
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