[jdk21u-dev] RFR: 8295111: dpkg appears to have problems resolving symbolically linked native libraries

[Vladimir Petko]

Hi all,

This pull request contains a backport of commit [32946e18](https://github.com/openjdk/jdk/commit/32946e1882e9b22c983cbba3c6bda3cc7295946a) from the [openjdk/jdk](https://git.openjdk.org/jdk) repository.

The commit being backported was authored by Alexey Semenyuk on 18 Apr 2024 and was reviewed by Alexander Matveev.

This change fixes an issue caused by usrmerge on Debian-based systems - dpkg -S does not return a package containing a symlinked shared library in /lib, e.g. 

dpkg -S /lib/x86_64-linux-gnu/libmd.so.0
# dpkg-query: no path found matching pattern /lib/x86_64-linux-gnu/libmd.so.0


The fix calls toRealPath() to resolve an actual path to the file before dpkg call and falls back to the old behaviour if the dpkg call fails.

The change is tested by jpackage set of jtreg tests and should be low risk. 


jpackage tests pass:


==============================
Test summary
==============================
   TEST                                              TOTAL  PASS  FAIL ERROR   
   jtreg:test/jdk/tools/jpackage                        61    61     0     0   
==============================
TEST SUCCESS



Thanks !!!

-------------

Commit messages:
 - Backport 32946e1882e9b22c983cbba3c6bda3cc7295946a

Changes: https://git.openjdk.org/jdk21u-dev/pull/601/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=601&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8295111
  Stats: 44 lines in 1 file changed: 19 ins; 3 del; 22 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/601.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/601/head:pull/601

PR: https://git.openjdk.org/jdk21u-dev/pull/601