Fix '.format()' issue with 'find' {} placeholder (double braces addition), escaped slash and reordering of arguments

[m-fol]

In sync.py (fetch_symlinks), Python's .format() interprets {} as a placeholder and tries to replace it with a positional argument at index 0. This causes the command string to be processed incorrectly before reaching bash.
The braces are intended for find, where {} instead should be replaced on runtime by the returned path. Suggested solution is to add double braces to find.

The escaping for the -exec action leads to error. By putting \ in bash, the slash is escaped, leading to the semicolon not being escaped. Suggested solution here is updating \\; to \;

Warning appears regarding the order of the arguments. Order should be updated with the logic that -mindepth and -maxdepth should be before ! and before -type.

Final solution:

-     find "{remote_store}/{cvmfs_architecture}/Packages/{package}/$full_version" ! -name etc -maxdepth 1 -mindepth 1 -exec ln -sf {} "{workDir}/INSTALLROOT/$pkg_hash/{architecture}/{package}/" \\;
+    find "{remote_store}/{cvmfs_architecture}/Packages/{package}/$full_version" -mindepth 1 -maxdepth 1 ! -name etc -exec ln -sf {{}} "{workDir}/INSTALLROOT/$pkg_hash/{architecture}/{package}/" \;

And:

-    for install_path in $(find "{remote_store}/{cvmfs_architecture}/Packages/{package}" -type d -mindepth 1 -maxdepth 1); do
+    for install_path in $(find "{remote_store}/{cvmfs_architecture}/Packages/{package}" -mindepth 1 -maxdepth 1 -type d); do