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rear/rear-fix-backup-of-btrfs-subvolumes.patch
Lukáš Zaoral bf82fec018 fix backup of btrfs subvolumes 
Resolves: RHEL-26827
2024-08-05 19:35:59 +02:00

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commit ec9080664303165799a215cef062826b65f6a6f8
Author: Johannes Meixner <jsmeix@suse.com>
Date: Fri Apr 12 15:25:28 2024 +0200
New unique_unsorted() function (#3177)
In lib/global-functions.sh added a
new unique_unsorted() function
that outputs lines in a file or from STDIN
without subsequent duplicate lines
which keeps the ordering of the lines, see
https://github.com/rear/rear/pull/3177
In backup/NETFS/default/500_make_backup.sh use
unique_unsorted $TMP_DIR/backup-include.txt
to ignore duplicate arguments provided
to 'tar' and 'rsync' what should be archived
to avoid that 'tar' and 'rsync' archive
exact same things multiple times
which needlessly increases backup time and
in case of 'tar' the backup archive size and
storage space and backup restore time, cf.
https://github.com/rear/rear/pull/3175#issuecomment-1985306750
Cherry-picked-by: Lukáš Zaoral <lzaoral@redhat.com>
diff --git a/usr/share/rear/backup/NETFS/default/500_make_backup.sh b/usr/share/rear/backup/NETFS/default/500_make_backup.sh
index feb4d322..fba03338 100644
--- a/usr/share/rear/backup/NETFS/default/500_make_backup.sh
+++ b/usr/share/rear/backup/NETFS/default/500_make_backup.sh
@@ -42,10 +42,10 @@ fi
# Log what is included in the backup and what is excluded from the backup
# cf. backup/NETFS/default/400_create_include_exclude_files.sh
-Log "Backup include list (backup-include.txt contents):"
+Log "Backup include list (backup-include.txt contents without subsequent duplicates):"
while read -r backup_include_item ; do
test "$backup_include_item" && Log " $backup_include_item"
-done < $TMP_DIR/backup-include.txt
+done < <( unique_unsorted $TMP_DIR/backup-include.txt )
Log "Backup exclude list (backup-exclude.txt contents):"
while read -r backup_exclude_item ; do
test "$backup_exclude_item" && Log " $backup_exclude_item"
@@ -127,7 +127,7 @@ case "$(basename ${BACKUP_PROG})" in
$BACKUP_PROG_CREATE_NEWER_OPTIONS \
${BACKUP_PROG_BLOCKS:+-b $BACKUP_PROG_BLOCKS} "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
-X $TMP_DIR/backup-exclude.txt -C / -c -f - \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE \| $BACKUP_PROG_CRYPT_OPTIONS BACKUP_PROG_CRYPT_KEY \| $SPLIT_COMMAND
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE \| $BACKUP_PROG_CRYPT_OPTIONS BACKUP_PROG_CRYPT_KEY \| $SPLIT_COMMAND
else
Log $BACKUP_PROG $TAR_OPTIONS --sparse --block-number --totals --verbose \
--no-wildcards-match-slash --one-file-system \
@@ -135,7 +135,7 @@ case "$(basename ${BACKUP_PROG})" in
$BACKUP_PROG_CREATE_NEWER_OPTIONS \
${BACKUP_PROG_BLOCKS:+-b $BACKUP_PROG_BLOCKS} "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
-X $TMP_DIR/backup-exclude.txt -C / -c -f - \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE \| $SPLIT_COMMAND
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE \| $SPLIT_COMMAND
fi
if is_true "$BACKUP_PROG_CRYPT_ENABLED" ; then
@@ -151,7 +151,7 @@ case "$(basename ${BACKUP_PROG})" in
${BACKUP_PROG_BLOCKS:+-b $BACKUP_PROG_BLOCKS} \
"${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
-X $TMP_DIR/backup-exclude.txt -C / -c -f - \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE | \
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE | \
{ $BACKUP_PROG_CRYPT_OPTIONS "$BACKUP_PROG_CRYPT_KEY" ; } 2>/dev/null | \
$SPLIT_COMMAND
pipes_rc=( ${PIPESTATUS[@]} )
@@ -160,14 +160,14 @@ case "$(basename ${BACKUP_PROG})" in
"$(basename $(echo "$BACKUP_PROG" | awk '{ print $1 }'))"
"$(basename $(echo "$SPLIT_COMMAND" | awk '{ print $1 }'))"
)
- $BACKUP_PROG $TAR_OPTIONS --sparse --block-number --totals --verbose \
- --no-wildcards-match-slash --one-file-system \
- --ignore-failed-read "${BACKUP_PROG_OPTIONS[@]}" \
- $BACKUP_PROG_CREATE_NEWER_OPTIONS \
- ${BACKUP_PROG_BLOCKS:+-b $BACKUP_PROG_BLOCKS} \
- "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
- -X $TMP_DIR/backup-exclude.txt -C / -c -f - \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE | \
+ $BACKUP_PROG $TAR_OPTIONS --sparse --block-number --totals --verbose \
+ --no-wildcards-match-slash --one-file-system \
+ --ignore-failed-read "${BACKUP_PROG_OPTIONS[@]}" \
+ $BACKUP_PROG_CREATE_NEWER_OPTIONS \
+ ${BACKUP_PROG_BLOCKS:+-b $BACKUP_PROG_BLOCKS} \
+ "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
+ -X $TMP_DIR/backup-exclude.txt -C / -c -f - \
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE | \
$SPLIT_COMMAND
pipes_rc=( ${PIPESTATUS[@]} )
fi
@@ -213,21 +213,21 @@ case "$(basename ${BACKUP_PROG})" in
mkdir -p $v "$backuparchive" >&2
Log $BACKUP_PROG --verbose "${BACKUP_RSYNC_OPTIONS[@]}" --one-file-system --delete \
--exclude-from=$TMP_DIR/backup-exclude.txt --delete-excluded \
- $(cat $TMP_DIR/backup-include.txt) "$backuparchive"
+ $(unique_unsorted $TMP_DIR/backup-include.txt) "$backuparchive"
$BACKUP_PROG --verbose "${BACKUP_RSYNC_OPTIONS[@]}" --one-file-system --delete \
--exclude-from=$TMP_DIR/backup-exclude.txt --delete-excluded \
- $(cat $TMP_DIR/backup-include.txt) "$backuparchive" >&2
+ $(unique_unsorted $TMP_DIR/backup-include.txt) "$backuparchive" >&2
;;
(*)
Log "Using unsupported backup program '$BACKUP_PROG'"
Log $BACKUP_PROG "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
$BACKUP_PROG_OPTIONS_CREATE_ARCHIVE $TMP_DIR/backup-exclude.txt \
"${BACKUP_PROG_OPTIONS[@]}" "$backuparchive" \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE > "$backuparchive"
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE > "$backuparchive"
$BACKUP_PROG "${BACKUP_PROG_COMPRESS_OPTIONS[@]}" \
$BACKUP_PROG_OPTIONS_CREATE_ARCHIVE $TMP_DIR/backup-exclude.txt \
"${BACKUP_PROG_OPTIONS[@]}" "$backuparchive" \
- $(cat $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE > "$backuparchive"
+ $(unique_unsorted $TMP_DIR/backup-include.txt) $RUNTIME_LOGFILE > "$backuparchive"
;;
esac 2> "${TMP_DIR}/${BACKUP_PROG_ARCHIVE}.log"
# For the rsync and default case the backup prog is the last in the case entry
diff --git a/usr/share/rear/lib/global-functions.sh b/usr/share/rear/lib/global-functions.sh
index 77263cb1..1fc083b4 100644
--- a/usr/share/rear/lib/global-functions.sh
+++ b/usr/share/rear/lib/global-functions.sh
@@ -14,6 +14,35 @@ function read_and_strip_file () {
sed -e '/^[[:space:]]/d;/^$/d;/^#/d' "$filename"
}
+# Output lines in STDIN or in a file without subsequent duplicate lines
+# i.e. for each line that was seen (and output) do not output subsequent duplicates of that line.
+# This keeps the ordering of the lines so the input
+# one
+# two
+# one
+# three
+# two
+# one
+# gets output as
+# one
+# two
+# three
+# To remove duplicate lines and keep the ordering one could use ... | cat -n | sort -uk2 | sort -nk1 | cut -f2-
+# cf. https://stackoverflow.com/questions/11532157/remove-duplicate-lines-without-sorting/11532197#11532197
+# that also explains an awk command that prints each line provided the line was not seen before.
+# The awk variable $0 holds an entire line and square brackets is associative array access in awk.
+# For each line the node of the associative array 'seen' is incremented and the line is printed
+# if the content of that node was not '!' previously set (i.e. if the line was not previously seen)
+# cf. https://www.thegeekstuff.com/2010/03/awk-arrays-explained-with-5-practical-examples/
+function unique_unsorted () {
+ local filename="$1"
+ if test "$filename" ; then
+ test -r "$filename" && awk '!seen[$0]++' "$filename"
+ else
+ awk '!seen[$0]++'
+ fi
+}
+
# Three functions to test
# if the argument is an integer
# if the argument is a positive integer (i.e. test for '> 0')
commit 2da70f54936e5c558c9f607b1526b9b17f6501b1
Author: Lukáš Zaoral <lzaoral@redhat.com>
Date: Fri Jul 12 10:44:04 2024 +0200
Automatically include mounted btrfs subvolumes in NETFS backups (#3175)
* automatically exclude btrfs snapshot subvolumes from 'btrfsmountedsubvol'
Related: https://github.com/rear/rear/pull/3175#issuecomment-1983498175
* automatically include mounted btrfs subvolumes in NETFS backups
... unless they are explicitly excluded.
Resolves: https://github.com/rear/rear/issues/2928
* always add the excluded component in RESTORE_EXCLUDE_FILE
Otherwise, the component itself would not be included if it had any child
components of the `fs` type.
* automatically exclude btrfs subvolume children of excluded components
Cherry-picked-by: Lukáš Zaoral <lzaoral@redhat.com>
diff --git a/usr/share/rear/layout/prepare/default/610_exclude_from_restore.sh b/usr/share/rear/layout/prepare/default/610_exclude_from_restore.sh
index 0a902041..1e7522b2 100644
--- a/usr/share/rear/layout/prepare/default/610_exclude_from_restore.sh
+++ b/usr/share/rear/layout/prepare/default/610_exclude_from_restore.sh
@@ -7,24 +7,33 @@ RESTORE_EXCLUDE_FILE="$TMP_DIR/restore-exclude-list.txt"
: >"$RESTORE_EXCLUDE_FILE"
+local component
+
for component in "${EXCLUDE_RECREATE[@]}" ; do
if ! IsInArray "$component" "${EXCLUDE_RESTORE[@]}" ; then
EXCLUDE_RESTORE+=( "$component" )
fi
done
+local comp_type children child
+local comp_types=( "btrfsmountedsubvol" "fs" )
+
for component in "${EXCLUDE_RESTORE[@]}" ; do
- fs_children=$(get_child_components "$component" "fs" | sort -u)
- if [ -n "$fs_children" ] ; then
- for child in $fs_children ; do
- child=${child#fs:}
- echo "${child#/}" >> "$RESTORE_EXCLUDE_FILE"
- echo "${child#/}/*" >> "$RESTORE_EXCLUDE_FILE"
- done
- else
- # if there are no fs deps, assume it is a wildcard path
- component=${component#fs:}
- echo "${component#/}" >> "$RESTORE_EXCLUDE_FILE"
- echo "${component#/}/*" >> "$RESTORE_EXCLUDE_FILE"
- fi
+ for comp_type in "${comp_types[@]}"; do
+ children=$(get_child_components "$component" "$comp_type" | sort -u)
+ if [ -n "$children" ] ; then
+ for child in $children ; do
+ child=${child#$comp_type:}
+ echo "${child#/}" >> "$RESTORE_EXCLUDE_FILE"
+ echo "${child#/}/*" >> "$RESTORE_EXCLUDE_FILE"
+ done
+ fi
+ done
+
+ # exclude the component itself
+ for comp_type in "${comp_types[@]}"; do
+ component=${component#$comp_type:}
+ done
+ echo "${component#/}" >> "$RESTORE_EXCLUDE_FILE"
+ echo "${component#/}/*" >> "$RESTORE_EXCLUDE_FILE"
done
diff --git a/usr/share/rear/layout/save/GNU/Linux/230_filesystem_layout.sh b/usr/share/rear/layout/save/GNU/Linux/230_filesystem_layout.sh
index 7990c055..166b9cd2 100644
--- a/usr/share/rear/layout/save/GNU/Linux/230_filesystem_layout.sh
+++ b/usr/share/rear/layout/save/GNU/Linux/230_filesystem_layout.sh
@@ -434,6 +434,7 @@ fi
# Output header only once:
btrfsmountedsubvol_entry_exists="yes"
echo "# All mounted btrfs subvolumes (including mounted btrfs default subvolumes and mounted btrfs snapshot subvolumes)."
+ echo "# Mounted btrfs snapshot subvolumes are autoexcluded."
if test "$findmnt_FSROOT_works" ; then
echo "# Determined by the findmnt command that shows the mounted btrfs_subvolume_path."
echo "# Format: btrfsmountedsubvol <device> <subvolume_mountpoint> <mount_options> <btrfs_subvolume_path>"
@@ -469,7 +470,10 @@ fi
# Finally, test whether the btrfs subvolume listed as mounted actually exists. A running docker
# daemon apparently can convince the system to list a non-existing btrfs volume as mounted.
# See https://github.com/rear/rear/issues/1496
- if btrfs_subvolume_exists "$subvolume_mountpoint" "$btrfs_subvolume_path"; then
+ if btrfs_snapshot_subvolume_exists "$subvolume_mountpoint" "$btrfs_subvolume_path"; then
+ # Exclude mounted snapshot subvolumes
+ echo "#btrfsmountedsubvol $device $subvolume_mountpoint $mount_options $btrfs_subvolume_path"
+ elif btrfs_subvolume_exists "$subvolume_mountpoint" "$btrfs_subvolume_path"; then
echo "btrfsmountedsubvol $device $subvolume_mountpoint $mount_options $btrfs_subvolume_path"
else
LogPrintError "Ignoring non-existing btrfs subvolume listed as mounted: $subvolume_mountpoint"
diff --git a/usr/share/rear/layout/save/default/340_generate_mountpoint_device.sh b/usr/share/rear/layout/save/default/340_generate_mountpoint_device.sh
index 2b58922b..fb358ccf 100644
--- a/usr/share/rear/layout/save/default/340_generate_mountpoint_device.sh
+++ b/usr/share/rear/layout/save/default/340_generate_mountpoint_device.sh
@@ -7,15 +7,15 @@
# EXCLUDE_RECREATE is handled automatically (commented out in LAYOUT_FILE)
excluded_mountpoints=()
while read fs device mountpoint junk ; do
- if IsInArray "fs:$mountpoint" "${EXCLUDE_BACKUP[@]}" ; then
+ if IsInArray "$fs:$mountpoint" "${EXCLUDE_BACKUP[@]}" ; then
excluded_mountpoints+=( $mountpoint )
fi
- for component in $(get_parent_components "fs:$mountpoint" | sort -u) ; do
+ for component in $(get_parent_components "$fs:$mountpoint" | sort -u) ; do
if IsInArray "$component" "${EXCLUDE_BACKUP[@]}" ; then
excluded_mountpoints+=( $mountpoint )
fi
done
-done < <(grep ^fs $LAYOUT_FILE)
+done < <(grep -E '^(fs|btrfsmountedsubvol)' $LAYOUT_FILE)
# Generate the list of mountpoints and devices to exclude from backup
while read fs device mountpoint junk ; do
@@ -25,4 +25,4 @@ while read fs device mountpoint junk ; do
continue
fi
echo "$mountpoint $device"
-done < <(grep '^fs' $LAYOUT_FILE) > $VAR_DIR/recovery/mountpoint_device
+done < <(grep -E '^(fs|btrfsmountedsubvol)' $LAYOUT_FILE) | unique_unsorted > $VAR_DIR/recovery/mountpoint_device
diff --git a/usr/share/rear/lib/filesystems-functions.sh b/usr/share/rear/lib/filesystems-functions.sh
index f0547706..826571be 100644
--- a/usr/share/rear/lib/filesystems-functions.sh
+++ b/usr/share/rear/lib/filesystems-functions.sh
@@ -3,16 +3,27 @@
#
# File system support functions
+function btrfs_snapshot_subvolume_exists() {
+ # returns true if the btrfs snapshot subvolume ($2) exists in the Btrfs
+ # file system at the mount point ($1).
+
+ # Use -s so that btrfs subvolume list considers snapshots only
+ btrfs_subvolume_exists "$1" "$2" "-s"
+}
+
function btrfs_subvolume_exists() {
# returns true if the btrfs subvolume ($2) exists in the Btrfs file system at the mount point ($1).
local subvolume_mountpoint="$1" btrfs_subvolume_path="$2"
+ # extra options for the btrfs subvolume list command ($3)
+ local btrfs_extra_opts="$3"
+
# A root subvolume can be assumed to always exist
[ "$btrfs_subvolume_path" == "/" ] && return 0
# A non-root subvolume exists if the btrfs subvolume list contains its complete path at the end of one line.
# This code deliberately uses a plain string comparison rather than a regexp.
- btrfs subvolume list -a "$subvolume_mountpoint" | sed -e 's; path <FS_TREE>/; path ;' |
+ btrfs subvolume list -a $btrfs_extra_opts "$subvolume_mountpoint" | sed -e 's; path <FS_TREE>/; path ;' |
awk -v path="$btrfs_subvolume_path" '
BEGIN {
match_string = " path " path;
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