Call apexd --unmount-all at the end of otapreopt_chroot run
We don't really care for the umount part, but we do care about freeing
up loop and dm block devices so that next run of otapreopt_chroot can
re-use them.
Note that we must run `apexd --unmount-all` inside otapreopt_chroot
itself. This is because otapreopt_chroot runs in /postintall namespace.
Test: install an OTA, check number of loop devices
Test: Install an OTA, cancel during finalization, Restart OTA
Test: forrest test -l remote --test_bench_config asit/crosshatch --extra_args '--delegated-tf ab://tradefed/tradefed/P21446393/.*google-tradefed.zip?unzip=true' ab::P21523880:aosp_crosshatch-userdebug:git_master asit/dexoptota/self_full
Bug: 184716804
Change-Id: I4f01cb9082f90fd40fba4a1864e8d6b548f5a274
diff --git a/cmds/installd/otapreopt_chroot.cpp b/cmds/installd/otapreopt_chroot.cpp
index c04b558..3a87776 100644
--- a/cmds/installd/otapreopt_chroot.cpp
+++ b/cmds/installd/otapreopt_chroot.cpp
@@ -27,6 +27,7 @@
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/macros.h>
+#include <android-base/scopeguard.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include <libdm/dm.h>
@@ -72,6 +73,15 @@
}
}
+static void DeactivateApexPackages() {
+ std::vector<std::string> apexd_cmd{"/system/bin/apexd", "--unmount-all"};
+ std::string apexd_error_msg;
+ bool exec_result = Exec(apexd_cmd, &apexd_error_msg);
+ if (!exec_result) {
+ PLOG(ERROR) << "Running /system/bin/apexd --unmount-all failed: " << apexd_error_msg;
+ }
+}
+
static void TryExtraMount(const char* name, const char* slot, const char* target) {
std::string partition_name = StringPrintf("%s%s", name, slot);
@@ -231,10 +241,30 @@
exit(205);
}
+ // Call apexd --unmount-all to free up loop and dm block devices, so that we can re-use
+ // them during the next invocation. Since otapreopt_chroot calls exit in case something goes
+ // wrong we need to register our own atexit handler.
+ // We want to register this handler before actually activating apex packages. This is mostly
+ // due to the fact that if fail to unmount apexes, then on the next run of otapreopt_chroot
+ // we will ask for new loop devices instead of re-using existing ones, and we really don't want
+ // to do that. :)
+ if (atexit(DeactivateApexPackages) != 0) {
+ LOG(ERROR) << "Failed to register atexit hander";
+ exit(206);
+ }
+
// Try to mount APEX packages in "/apex" in the chroot dir. We need at least
// the ART APEX, as it is required by otapreopt to run dex2oat.
ActivateApexPackages();
+ auto cleanup = android::base::make_scope_guard([](){
+ std::vector<std::string> apexd_cmd{"/system/bin/apexd", "--unmount-all"};
+ std::string apexd_error_msg;
+ bool exec_result = Exec(apexd_cmd, &apexd_error_msg);
+ if (!exec_result) {
+ PLOG(ERROR) << "Running /system/bin/apexd --unmount-all failed: " << apexd_error_msg;
+ }
+ });
// Check that an ART APEX has been activated; clean up and exit
// early otherwise.
static constexpr const std::string_view kRequiredApexs[] = {