roots: Fix an issue with volume_for_path().
The earlier commit in 2dfc1a38982c4052bb32bc7fc06edeadf3908fb9
unintentionally changed the behavior. It gives a different result when
looking up non-existent mount points (e.g. /cache on marlin).
The logic behind volume_for_path("/xyz") is unclear:
- It's fine to return non-null value if it's called by
ensure_path_mounted() before accessing that file "/xyz". (Just based
on the function name, we're not actually having this case.)
- It should return nullptr if the caller is interested in the existence
of that particular mount point "/xyz".
This CL renames the function to volume_for_mount_point(), which does an
exact match by querying the given mount point from libfs_mgr. The former
volume_for_path() has been moved down to function scope for serving
ensure_path_mounted() only.
Test: Build and boot into recovery on bullhead and marlin respectively.
'View recovery logs'.
Test: 'Mount /system'
Test: 'Apply update from ADB'
Change-Id: I1a16390f57540cae08a2b8f3d439d17886975217
diff --git a/install.cpp b/install.cpp
index 507161c..74d1a68 100644
--- a/install.cpp
+++ b/install.cpp
@@ -653,7 +653,7 @@
std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
int time_total = static_cast<int>(duration.count());
- bool has_cache = volume_for_path("/cache") != nullptr;
+ bool has_cache = volume_for_mount_point("/cache") != nullptr;
// Skip logging the uncrypt_status on devices without /cache.
if (has_cache) {
static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
diff --git a/recovery.cpp b/recovery.cpp
index 076b449..4dc5b54 100644
--- a/recovery.cpp
+++ b/recovery.cpp
@@ -1396,7 +1396,7 @@
printf("Starting recovery (pid %d) on %s", getpid(), ctime(&start));
load_volume_table();
- has_cache = volume_for_path(CACHE_ROOT) != nullptr;
+ has_cache = volume_for_mount_point(CACHE_ROOT) != nullptr;
std::vector<std::string> args = get_args(argc, argv);
std::vector<char*> args_to_parse(args.size());
diff --git a/roots.cpp b/roots.cpp
index 02c1ecb..c0348d7 100644
--- a/roots.cpp
+++ b/roots.cpp
@@ -69,11 +69,15 @@
printf("\n");
}
+Volume* volume_for_mount_point(const std::string& mount_point) {
+ return fs_mgr_get_entry_for_mount_point(fstab, mount_point);
+}
+
// Finds the volume specified by the given path. fs_mgr_get_entry_for_mount_point() does exact match
// only, so it attempts the prefixes recursively (e.g. "/cache/recovery/last_log",
// "/cache/recovery", "/cache", "/" for a given path of "/cache/recovery/last_log") and returns the
// first match or nullptr.
-Volume* volume_for_path(const char* path) {
+static Volume* volume_for_path(const char* path) {
if (path == nullptr || path[0] == '\0') return nullptr;
std::string str(path);
while (true) {
diff --git a/roots.h b/roots.h
index 542f03b..46bb77e 100644
--- a/roots.h
+++ b/roots.h
@@ -17,13 +17,15 @@
#ifndef RECOVERY_ROOTS_H_
#define RECOVERY_ROOTS_H_
+#include <string>
+
typedef struct fstab_rec Volume;
// Load and parse volume data from /etc/recovery.fstab.
void load_volume_table();
-// Return the Volume* record for this path (or NULL).
-Volume* volume_for_path(const char* path);
+// Return the Volume* record for this mount point (or nullptr).
+Volume* volume_for_mount_point(const std::string& mount_point);
// Make sure that the volume 'path' is on is mounted. Returns 0 on
// success (volume is mounted).