Update .stow-local-ignore with files in /home/user that would break running stow

Fix from devfile/developer-images/pull/196

Signed-off-by: David Kwon <[email protected]>

Author: dkwon17

devspaces-udi/etc/entrypoint.sh

@@ -145,6 +145,32 @@ mountpoint -q /home/user/ || HOME_USER_MOUNTED=$?
 STOW_COMPLETE=/home/user/.stow_completed
 
 if [ $HOME_USER_MOUNTED -eq 0 ] && [ ! -f $STOW_COMPLETE ]; then
+    # There may be regular, non-symlink files in /home/user that match the
+    # pathing of files in /home/tooling. Stow will error out when it tries to
+    # stow on top of that. Instead, we can append to the current
+    # /home/tooling/.stow-local-ignore file to ignore pre-existing,
+    # non-symlinked files in /home/user that match those in /home/tooling before
+    # we run stow.
+    #
+    # Create two text files containing a sorted path-based list of files in
+    # /home/tooling and /home/user. Cut off "/home/user" and "/home/tooling" and
+    # only get the sub-paths so we can do a proper comparison
+    #
+    # In the case of /home/user, we want regular file types and not symbolic
+    # links.
+    find /home/user -type f -xtype f -print  | sort | sed 's|/home/user||g' > /tmp/user.txt
+    find /home/tooling -print | sort | sed 's|/home/tooling||g' > /tmp/tooling.txt
+    # We compare the two files, trying to find files that exist in /home/user
+    # and /home/tooling. Being that the files that get flagged here are not
+    # already synlinks, we will want to ignore them.
+    IGNORE_FILES="$(comm -12 /tmp/user.txt /tmp/tooling.txt)"
+    # We no longer require the file lists, so remove them
+    rm /tmp/user.txt /tmp/tooling.txt
+    # For each file we need to ignore, append them to
+    # /home/tooling/.stow-local-ignore.
+    for f in $IGNORE_FILES; do echo "${f}" >> /home/tooling/.stow-local-ignore;done
+    # We are now ready to run stow
+    #
     # Create symbolic links from /home/tooling/ -> /home/user/
     stow . -t /home/user/ -d /home/tooling/ --no-folding -v 2 > /tmp/stow.log 2>&1
     # Vim does not permit .viminfo to be a symbolic link for security reasons, so manually copy it