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Ignore unused PV devices

Resolves: rhbz2048454
This commit is contained in:
Pavel Cahyna 2022-02-21 15:09:24 +01:00
parent 0a9b459411
commit 4406dbba7b
2 changed files with 79 additions and 0 deletions
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78
rear-bz2048454.patch Normal file
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@ -0,0 +1,78 @@
diff --git a/usr/share/rear/layout/save/GNU/Linux/220_lvm_layout.sh b/usr/share/rear/layout/save/GNU/Linux/220_lvm_layout.sh
index 35be1721..d3c9ae86 100644
--- a/usr/share/rear/layout/save/GNU/Linux/220_lvm_layout.sh
+++ b/usr/share/rear/layout/save/GNU/Linux/220_lvm_layout.sh
@@ -103,12 +103,7 @@ local lvs_exit_code
pdev=$( get_device_name $pdev )
# Output lvmdev entry to DISKLAYOUT_FILE:
- # With the above example the output is:
- # lvmdev /dev/system /dev/sda1 7wwpcO-KmNN-qsTE-7sp7-JBJS-vBdC-Zyt1W7 41940992
- echo "lvmdev /dev/$vgrp $pdev $uuid $size"
-
- # After the 'lvmdev' line was written to disklayout.conf so that the user can inspect it
- # check that the required positional parameters in the 'lvmdev' line are non-empty
+ # Check that the required positional parameters in the 'lvmdev' line are non-empty
# because an empty positional parameter would result an invalid 'lvmdev' line
# which would cause invalid parameters are 'read' as input during "rear recover"
# cf. "Verifying ... 'lvm...' entries" in layout/save/default/950_verify_disklayout_file.sh
@@ -117,13 +112,24 @@ local lvs_exit_code
# so that this also checks that the variables do not contain blanks or more than one word
# because blanks (actually $IFS characters) are used as field separators in disklayout.conf
# which means the positional parameter values must be exactly one non-empty word.
- # Two separated simple 'test $vgrp && test $pdev' commands are used here because
- # 'test $vgrp -a $pdev' does not work when $vgrp is empty or only blanks
- # because '-a' has two different meanings: "EXPR1 -a EXPR2" and "-a FILE" (see "help test")
- # so that when $vgrp is empty 'test $vgrp -a $pdev' tests if file $pdev exists
- # which is usually true because $pdev is usually a partition device node (e.g. /dev/sda1)
- # so that when $vgrp is empty 'test $vgrp -a $pdev' would falsely succeed:
- test $vgrp && test $pdev || Error "LVM 'lvmdev' entry in $DISKLAYOUT_FILE where volume_group or device is empty or more than one word"
+ test $pdev || Error "Cannot make 'lvmdev' entry in disklayout.conf (PV device '$pdev' empty or more than one word)"
+ if ! test $vgrp ; then
+ # Valid $pdev but invalid $vgrp (empty or more than one word):
+ # When $vgrp is empty it means it is a PV that is not part of a VG so the PV exists but it is not used.
+ # PVs that are not part of a VG are documented as comment in disklayout.conf but they are not recreated
+ # because they were not used on the original system so there is no need to recreate them by "rear recover"
+ # (the user can manually recreate them later in his recreated system when needed)
+ # cf. https://github.com/rear/rear/issues/2596
+ DebugPrint "Skipping PV $pdev that is not part of a valid VG (VG '$vgrp' empty or more than one word)"
+ echo "# Skipping PV $pdev that is not part of a valid VG (VG '$vgrp' empty or more than one word):"
+ contains_visible_char "$vgrp" || vgrp='<missing_VG>'
+ echo "# lvmdev /dev/$vgrp $pdev $uuid $size"
+ # Continue with the next line in the output of "lvm pvdisplay -c"
+ continue
+ fi
+ # With the above example the output is:
+ # lvmdev /dev/system /dev/sda1 7wwpcO-KmNN-qsTE-7sp7-JBJS-vBdC-Zyt1W7 41940992
+ echo "lvmdev /dev/$vgrp $pdev $uuid $size"
done
# Check the exit code of "lvm pvdisplay -c"
@@ -161,8 +167,15 @@ local lvs_exit_code
# lvmgrp /dev/system 4096 5119 20967424
echo "lvmgrp /dev/$vgrp $extentsize $nrextents $size"
- # Check that the required positional parameters in the 'lvmgrp' line are non-empty
- # cf. the code above to "check that the required positional parameters in the 'lvmdev' line are non-empty":
+ # Check that the required positional parameters in the 'lvmgrp' line are non-empty.
+ # The tested variables are intentionally not quoted here, cf. the code above to
+ # "check that the required positional parameters in the 'lvmdev' line are non-empty".
+ # Two separated simple 'test $vgrp && test $extentsize' commands are used here because
+ # 'test $vgrp -a $extentsize' does not work when $vgrp is empty or only blanks
+ # because '-a' has two different meanings: "EXPR1 -a EXPR2" and "-a FILE" (see "help test")
+ # so with empty $vgrp it becomes 'test -a $extentsize' that tests if a file $extentsize exists
+ # which is unlikely to be true but it is not impossible that a file $extentsize exists
+ # so when $vgrp is empty (or blanks) 'test $vgrp -a $extentsize' might falsely succeed:
test $vgrp && test $extentsize || Error "LVM 'lvmgrp' entry in $DISKLAYOUT_FILE where volume_group or extentsize is empty or more than one word"
done
@@ -305,7 +318,8 @@ local lvs_exit_code
fi
already_processed_lvs+=( "$vg/$lv" )
# Check that the required positional parameters in the 'lvmvol' line are non-empty
- # cf. the code above to "check that the required positional parameters in the 'lvmdev' line are non-empty":
+ # cf. the code above to "check that the required positional parameters in the 'lvmdev' line are non-empty"
+ # and the code above to "check that the required positional parameters in the 'lvmgrp' line are non-empty":
test $vg && test $lv && test $size && test $layout || Error "LVM 'lvmvol' entry in $DISKLAYOUT_FILE where volume_group or name or size or layout is empty or more than one word"
fi

1
rear.spec
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@ -27,6 +27,7 @@ Patch36: rear-bz1993296.patch
Patch37: rear-bz1747468.patch
Patch38: rear-bz2049091.patch
Patch39: rear-pr2675.patch
Patch40: rear-bz2048454.patch
# rear contains only bash scripts plus documentation so that on first glance it could be "BuildArch: noarch"
# but actually it is not "noarch" because it only works on those architectures that are explicitly supported.