various minor improvements

[distro-setup] / mount-latest-subvol

diff --git a/mount-latest-subvol b/mount-latest-subvol
index e4c4d6b0a652b992f6feb7483cecd394bbf1040c..d39b8823f89a1da652c035f320a513d1cf13dc45 100644 (file)
--- a/mount-latest-subvol
+++ b/mount-latest-subvol
@@ -73,26 +73,43 @@ mnt() {
         e mount $dir
     fi
 }
+fstab() {
+    while read -r start mpoint end; do
+        l="$start $mpoint $end"
+        # kill off any lines that duplicate the mount point.
+        sed --follow-symlinks -ri "\%$l%b;\%^\s*\S+\s+$mpoint\s%d" /etc/fstab
+        tu /etc/fstab <<<"$l"
+    done
+}
 
 ret=0
 
 ##### begin setup fstab for subvols we care about ######
 first_root_crypt=$(awk '$2 == "/" {print $1}' /etc/mtab)
-tu /etc/fstab <<EOF
+fstab <<EOF
 $first_root_crypt  /a  btrfs  noatime,subvol=a  0 0
 EOF
-case $HOSTNAME in
-    treetowl|x2|frodo)
-        tu /etc/fstab <<EOF
+
+shopt -s nullglob
+
+f=(/mnt/root/btrbk/q.*)
+if [[ -e $f ]]; then
+    fstab <<EOF
 $first_root_crypt  /q  btrfs  noatime,subvol=q  0 0
-$first_root_crypt  /o  btrfs  noatime,subvol=o  0 0
 /q/p  /p  none  bind  0 0
+EOF
+fi
+
+f=(/mnt/root/btrbk/o.*)
+if [[ -e $f ]]; then
+    fstab <<EOF
+$first_root_crypt  /o  btrfs  noatime,subvol=o  0 0
 /o/m  /m  none  bind  0 0
 EOF
-        ;;
-esac
+fi
+
 if [[ $HOSTNAME == frodo ]]; then
-    tu /etc/fstab <<EOF
+    fstab <<EOF
 $first_root_crypt  /i  btrfs  noatime,subvol=i  0 0
 EOF
 fi
@@ -146,19 +163,22 @@ for vol in q a o i; do
             if e umount -R $dir; then
                 unmounted+=($dir)
             else
-                echo "$0: failed to umount $dir"
-                # lsof will fail if it finds no pids
-                if ! e lsof $dir; then
-                    umount_ret=false
-                    ret=1
-                    continue
+                if pids=$(timeout 4 lsof -t $dir); then
+                    timeout 4 lsof -w $dir
+                    kill $pids
+                fi
+
+                # fuser will find open sockets that lsof won't, for example from gpg-agent.
+                # note: -v shows kernel processes, which then doesn't return true when we want
+                if timeout 4 fuser -m $dir &>/dev/null; then
+                    fuser -TERM -mvk $dir
                 fi
-                pids=$(lsof -t $dir) ||:
-                kill $pids
+
                 sleep .5
                 if e umount -R $dir; then
                     unmounted+=($dir)
                 else
+                    echo "$0: failed to umount $dir"
                     umount_ret=false
                     ret=1
                     continue