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gtimezone: Fix symlink checks on relative link targets

Philip Withnall requested to merge pwithnall/glib:timezone-relative-link-target into main

The changes in 6265b2e6 to reject weird /etc/localtime configurations where /etc/localtime links to another symlink did not consider the case where the target of /etc/localtime is a relative path. They only considered the case where the target is absolute.

Relative paths are permissible in all symlinks. On my Fedora 36 system, /etc/localtime’s target is ../usr/share/zoneinfo/Europe/London.

Fix the check for toolbx by resolving relative paths before calling g_lstat() on them.

Signed-off-by: Philip Withnall pwithnall@endlessos.org

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