fix permissions, capitalize variable names

sync.run

@@ -24,20 +24,20 @@ export IPFS_PATH=/var/lib/ipfs
 
 if [[ ! -d $MIRROR_DIR ]]; then
     mkdir -p $MIRROR_DIR
-    chown ipfs:ipfs $MIRROR_DIR
 fi
+chown ipfs:ipfs $MIRROR_DIR
 
 export GNUPGHOME=/etc/debmirror/gnupg
 
 if [[ ! -d $GNUPGHOME ]]; then
     mkdir -p $GNUPGHOME
-    chown ipfs:ipfs $GNUPGHOME
 fi
+chown ipfs:ipfs $GNUPGHOME
 
 chpst -u ipfs /bin/bash << '__EOF__'
 
 export IPFS=/usr/local/bin/ipfs
-export HOME=/home/ipfs
+export HOME=/var/lib/ipfs
 export IPFS_FD_MAX=4096
 
 gpg --no-default-keyring --keyring $GNUPGHOME/trustedkeys.kbx --import \
@@ -47,6 +47,8 @@ $IPFS config --json Experimental.FilestoreEnabled true
 
 echo "Synchronizing with the main Ubuntu mirror."
 
+set -x # error out if the sync fails
+
 debmirror \
     --keyring $GNUPGHOME/trustedkeys.kbx \
 	-a ${MIRROR_ARCHITECTURES:-amd64} \
@@ -60,19 +62,20 @@ debmirror \
 	--method=http \
 	$MIRROR_DIR
 
+set +x # resume ignoring errors
 # Publish the files on IPFS.
 # This uses the experimental filestore:
 # https://github.com/ipfs/go-ipfs/issues/3397#issuecomment-284337564
 
 echo "Adding the mirror files to IPFS."
-hash="$($IPFS add --progress --local --nocopy --fscache --quieter --recursive "$MIRROR_DIR" | tail -n1)"
-echo "Published IPFS hash ${hash}."
+HASH="$($IPFS add --progress --local --nocopy --fscache --quieter --recursive "$MIRROR_DIR" | tail -n1)"
+echo "Published (added/pinned) /ipfs/${HASH}."
 
 echo "Updating IPNS."
-ipns="$($IPFS name publish "${hash}" | cut -d ' ' -f 3 | tr -d ':')"
+IPNS="$($IPFS name publish "${HASH}" | cut -d ' ' -f 3 | tr -d ':')"
 echo "IPFS Mirror synchronized."
-echo "Add the address 'ipfs:/ipns/${ipns}' to your '/etc/apt/sources.list'."
-echo "For example, add 'deb ipfs:/ipns/${ipns} xenial main' if you are in Ubuntu 16.04, and you want to use IPFS to get updates from the main archive."
+echo "Add the address 'ipfs:/ipns/${IPNS}' to your '/etc/apt/sources.list'."
+echo "For example, add 'deb ipfs:/ipns/${IPNS} xenial main'"
 __EOF__
 
 sleep 3600 # wait 1h before syncing again