Check if symbolic link is relative to location path

[abraunegg]

• If a symbolic link is 'relative', it is relative to the path where the symbolic link exists, not the current working directory. Test if the failed symbolic link read is due to the link being relative, and advise accordingly.

[abraunegg]

file setup:

total 0
drwxrwxr-x. 2 alex alex 46 May 30 09:16 .
drwxrwxr-x. 3 alex alex 35 May 30 09:14 ..
lrwxrwxrwx. 1 alex alex 61 May 30 09:16 absolute.txt -> /home/alex/OneDrivePersonal/link_tests/intercambio/prueba.txt
lrwxrwxrwx. 1 alex alex 13 May 30 09:16 relative.txt -> ../prueba.txt

Without PR:

./onedrive --confdir '~/.config/onedrive-personal/' --synchronize 
Configuration file successfully loaded
Initializing the Synchronization Engine ...
Syncing changes from OneDrive ...
Skipping item - invalid symbolic link: ./link_tests/intercambio/inv/relative.txt

With PR:

./onedrive --confdir '~/.config/onedrive-personal/' --synchronize 
Configuration file successfully loaded
Initializing the Synchronization Engine ...
Syncing changes from OneDrive ...
Uploading new file ./link_tests/intercambio/inv/relative.txt ... done.

[abraunegg]

@norbusan
This PR is now good for review & merge

[abraunegg]

@norbusan
Updated code handles the following symbolic links:

total 0
drwxrwxr-x. 2 alex alex 79 Jun  1 12:22 .
drwxrwxr-x. 3 alex alex 35 May 30 09:14 ..
lrwxrwxrwx. 1 alex alex 61 May 30 09:16 absolute.txt -> /home/alex/OneDrivePersonal/link_tests/intercambio/prueba.txt
lrwxrwxrwx. 1 alex alex 26 Jun  1 12:21 asdf.txt -> ../../../zzzz/asdfasdf.txt
lrwxrwxrwx. 1 alex alex 15 Jun  1 12:22 fubar.txt -> ./../prueba.txt
lrwxrwxrwx. 1 alex alex 13 May 30 09:16 relative.txt -> ../prueba.txt

[github-actions]

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