tree 197fb18c26b6cc526e878a6e998a817fe25a78bb
parent 98e102f377d9a5e8f7bbac1063ac39bc5fc8d023
author Ed Tanous <edtanous@google.com> 1619810366 -0700
committer Ed Tanous <edtanous@google.com> 1619810623 -0700

Check for errors before trying to open a bus

This is a fix to a regression introduced as part of
9b86787adea3f8f29fac2acbb9fa0f48fbcf244a
namely, the recursive iterator doesn't check for the existence of a bus
path before attempting to open it, which results in a crash when
std::filesystem throws an exception.

This was reported as part of bug #8

Tested:
Launched entity-manager in qemu, which was previously crashing and
observed "Unable to open path /sys/bus/i2c/devices/i2c-4" in the journal
log, with entity-manager staying running.

Signed-off-by: Ed Tanous <edtanous@google.com>
Change-Id: I638a66e271df0041d4df75be22eb03c064d9cf68