X-Git-Url: https://iankelling.org/git/?a=blobdiff_plain;f=mount-latest-subvol;h=13cfc3d159967ad8bff254093081dbe66933962a;hb=51c8b40fd2aac71d29dc9298ca65425725ad1edd;hp=4c1ee2f6b1ca1ae1239062d5fe329f2b20bb983a;hpb=89fc59d6e4bbeb1778c6aaaee776122dcf790871;p=distro-setup

diff --git a/mount-latest-subvol b/mount-latest-subvol
index 4c1ee2f..13cfc3d 100644
--- a/mount-latest-subvol
+++ b/mount-latest-subvol
@@ -18,7 +18,7 @@ readonly this_file
 cd /
 [[ $EUID == 0 ]] || exec sudo -E "$this_file" "$@"
 
-source /usr/local/lib/err
+source /usr/local/lib/bash-bear
 
 usage() {
   cat <<EOF
@@ -38,7 +38,7 @@ EOF
   exit $1
 }
 
-
+pre="mount-latest-subvol:${SSH_CLIENT:+ $HOSTNAME:}"
 
 tu() {
   while read -r line; do
@@ -48,17 +48,17 @@ tu() {
 }
 d() {
   if $verbose; then
-    printf "%s\n" "$*"
+    printf "$pre %s\n" "$*"
   fi
 }
 m() {
   if $verbose; then
-    printf "%s\n" "$*"
+    printf "$pre %s\n" "$*"
   fi
   "$@"
 }
 x() {
-  printf "%s\n" "$*"
+  printf "$pre %s\n" "$*"
   "$@"
 }
 
@@ -171,7 +171,7 @@ done
 if (( $# )); then
   all_vols=( "$@" )
 else
-  all_vols=(q a o i ar qr)
+  all_vols=(q a o i ar qd qr)
 fi
 
 ##### end command line parsing ########
@@ -242,6 +242,7 @@ fa=(/mnt/root/btrbk/q.*); f=${fa[0]}
 if [[ -e $f ]]; then
   fstab <<EOF
 $crypt_dev  /q  btrfs  noatime,subvol=q,gid=1000$mopts  0 0
+$crypt_dev  /qd  btrfs  noatime,subvol=qd,gid=1000$mopts  0 0
 /q/p  /p  none  bind$mopts  0 0
 EOF
 fi
@@ -270,6 +271,7 @@ EOF
   fi
   fstab <<EOF
 /o/m  /m  none  bind$mopts  0 0
+/o/debbugs  /debbugs  none  bind$mopts  0 0
 EOF
 fi
 
@@ -316,6 +318,7 @@ for vol in ${all_vols[@]}; do
   ##### end building up list of bind mounts  ######
 
 
+
   # if latest is already mounted, make sure binds are mounted and move on
   m check-subvol-stale $d
   # populated by check-subvol-stale if stale
@@ -334,6 +337,28 @@ for vol in ${all_vols[@]}; do
     continue
   fi
 
+
+  ##### begin checking for loopback mounts ####
+  found_loop=false
+  for l in $(losetup -ln|awk '{print $6}'); do
+    for dir in $d ${binds[@]}; do
+      if [[ $l == $dir* ]]; then
+        echo "$0: found loopback mount $l. giving up on unmounting $dir"
+        ret=1
+        found_loop=true
+        break
+      fi
+    done
+    if $found_loop; then
+      break
+    fi
+  done
+  if $found_loop; then
+    continue
+  fi
+  ##### end end checking loopback mounts ####
+
+
   ## not using arbtt at the moment
   # if [[ $vol == q ]]; then
   #   ## allow to fail, user might not be logged in
@@ -381,50 +406,54 @@ for vol in ${all_vols[@]}; do
   ### end getting root_dir
 
   cd $root_dir
-  if [[ -e $vol ]]; then
-    leaf=$vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
-    m mv $vol $leaf
-    m btrfs property set -ts $leaf ro true
-
-    ### begin check if leaf is different, delete it if not ###
-    parentid=$(btrfs sub show $leaf | awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
-    bsubs=(btrbk/$vol.*)
-    bsub= # base subvolume
-    # go in reverse order as its more likely to be at the end
-    for ((i=${#bsubs[@]}-1; i>=0; i--)); do
-      if [[ $parentid == $(btrfs sub show ${bsubs[i]} | awk '$1 == "UUID:" {print $2}') ]]; then
-        bsub=${bsubs[i]}
-        break
-      fi
-    done
-    if [[ $bsub ]]; then
-      # in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
-      # $ errno 32
-      # EPIPE 32 Broken pipe
-      lines=$(btrfs send --no-data -p $bsub $leaf | btrfs receive --dump | head -n 100 | wc -l || [[ $? == 141 || ${PIPESTATUS[0]} == 32 ]])
-      if [[ $lines == 0 ]]; then
-        # example output of no differences:
-        # snapshot        ./qrtest                        uuid=c41ff6b7-0527-f34d-95ac-190eecf54ff5 transid=2239 parent_uuid=64949e1b-4a3e-3945-9a8e-cd7b7c15d7d6 parent_transid=2239
-        echo suspected identical: $bsub $leaf
-        x btrfs sub del $leaf
+  if [[ -e $vol  ]]; then
+    if [[ $vol == qd ]]; then
+      m btrfs sub del qd
+    else
+      leaf=$vol.leaf.$(date +%Y-%m-%dT%H:%M:%S%z)
+      m mv $vol $leaf
+      m btrfs property set -ts $leaf ro true
+
+      ### begin check if leaf is different, delete it if not ###
+      parentid=$(btrfs sub show $leaf | awk '$1 == "Parent" && $2 == "UUID:" {print $3}')
+      bsubs=(btrbk/$vol.*)
+      bsub= # base subvolume
+      # go in reverse order as its more likely to be at the end
+      for ((i=${#bsubs[@]}-1; i>=0; i--)); do
+        if [[ $parentid == $(btrfs sub show ${bsubs[i]} | awk '$1 == "UUID:" {print $2}') ]]; then
+          bsub=${bsubs[i]}
+          break
+        fi
+      done
+      if [[ $bsub ]]; then
+        # in testing, same subvol is 136 bytes. allow some overhead. 32 happens sometimes under systemd.
+        # $ errno 32
+        # EPIPE 32 Broken pipe
+        lines=$(btrfs send --no-data -p $bsub $leaf | btrfs receive --dump | head -n 100 | wc -l || [[ $? == 141 || ${PIPESTATUS[0]} == 32 ]])
+        if [[ $lines == 0 ]]; then
+          # example output of no differences:
+          # snapshot        ./qrtest                        uuid=c41ff6b7-0527-f34d-95ac-190eecf54ff5 transid=2239 parent_uuid=64949e1b-4a3e-3945-9a8e-cd7b7c15d7d6 parent_transid=2239
+          echo suspected identical: $bsub $leaf
+          x btrfs sub del $leaf
+        fi
       fi
+      ### end check if leaf is different, delete it if not ###
+
+      ## begin expire leaf vols ##
+      leaf_vols=($vol.leaf.*)
+      count=${#leaf_vols[@]}
+      leaf_limit_time=$(( EPOCHSECONDS - 60*60*24*60 )) # 60 days
+      leaf_new_limit_time=$(( EPOCHSECONDS - 60*60*24 * 5 )) # 5 days this
+      # goes backwards from oldest. leaf_new_limit_time is a safety
+      # measure to ensure we don't delete very recent leafs.
+      for leaf in ${leaf_vols[@]}; do
+        leaf_time=$(date -d ${leaf#"$vol".leaf.} +%s)
+        if (( leaf_limit_time > leaf_time || ( leaf_new_limit_time > leaf_time && count > 30 ) )); then
+          x btrfs sub del $leaf
+        fi
+        count=$((count-1))
+      done
     fi
-    ### end check if leaf is different, delete it if not ###
-
-    ## begin expire leaf vols ##
-    leaf_vols=($vol.leaf.*)
-    count=${#leaf_vols[@]}
-    leaf_limit_time=$(( EPOCHSECONDS - 60*60*24*60 )) # 60 days
-    leaf_new_limit_time=$(( EPOCHSECONDS - 60*60*24 * 5 )) # 5 days this
-    # goes backwards from oldest. leaf_new_limit_time is a safety
-    # measure to ensure we don't delete very recent leafs.
-    for leaf in ${leaf_vols[@]}; do
-      leaf_time=$(date -d ${leaf#"$vol".leaf.} +%s)
-      if (( leaf_limit_time > leaf_time || ( leaf_new_limit_time > leaf_time && count > 30 ) )); then
-        x btrfs sub del $leaf
-      fi
-      count=$((count-1))
-    done
     ## end expire leaf vols ##
   fi
   #### end dealing with leaf vols ####
@@ -472,6 +501,9 @@ for dir in /mnt/r7/amy/{root/root,boot/boot}_ubuntubionic /mnt/{root2/root,boot2
   rm -f /nocow/btrfs-stale/$vol
 done
 
+if (( ret >= 1 )); then
+  echo "$0: exit status $ret. see error above"
+fi
 exit $ret