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-rw-r--r--old-school/lvm-create.sh48
1 files changed, 44 insertions, 4 deletions
diff --git a/old-school/lvm-create.sh b/old-school/lvm-create.sh
index e6f4eea..743b83a 100644
--- a/old-school/lvm-create.sh
+++ b/old-school/lvm-create.sh
@@ -31,9 +31,19 @@ init_samizdat()
31 local imgfile="$1" megs="$2" keyfile="$3" dev 31 local imgfile="$1" megs="$2" keyfile="$3" dev
32 32
33 init_samizdat_blockdev "$imgfile" "$megs" "$keyfile" || return 33 init_samizdat_blockdev "$imgfile" "$megs" "$keyfile" || return
34 local blockdev=/dev/mapper/samizdatcrypt 34 local blockdev=/dev/mapper/samizdatcrypt uuid
35
36 for fs in /cdrom/live/*.btrfs; do
37 losetup -f "$fs" || return
38 done
39 modprobe btrfs || return
40 btrfs device scan || return
41
42 uuid=$(choose_uuid) || return
43 [ "$uuid" ]
44
45 mount -t btrfs -o subvol=ROOT UUID="$uuid" /root || return
35 46
36 mount -t btrfs -o subvol=ROOT /cdrom/live/filesystem.btrfs /root || return
37 btrfs device add "$blockdev" /root || return 47 btrfs device add "$blockdev" /root || return
38 mount -o rw,remount /root || return 48 mount -o rw,remount /root || return
39 btrfs subvolume create /root/gpg || return 49 btrfs subvolume create /root/gpg || return
@@ -53,14 +63,44 @@ init_samizdat()
53 bootdone root-mounted 63 bootdone root-mounted
54} 64}
55 65
66# Get the uuid of the filesystem with the most devices,
67# excluding filesystems that don't incorporate loop devices.
68# This is used to choose the latest seed -- which should have
69# the most layers.
70choose_uuid()
71{
72 local seen_loop= seen_uuid= seen_devs=
73 btrfs filesystem show |
74 while read line; do
75 case "$line" in
76 Label*)
77 seen_uuid=${line##*uuid: }
78 seen_devs=
79 seen_loop=
80 ;;
81 *Total\ devices*)
82 seen_devs=${line#*Total devices }
83 seen_devs=${seen_devs%% *}
84 ;;
85 *path\ /dev/loop*)
86 seen_loop=t;;
87 esac
88 [ "$seen_loop" ] && echo "$seen_devs $seen_uuid"
89 done |
90 uniq | sort -nr | head -n1 | (read _ x; echo $x)
91}
92
56open_samizdat() 93open_samizdat()
57{ 94{
58 open_samizdat_blockdev "$@" || return 95 open_samizdat_blockdev "$@" || return
59 local blockdev=/dev/mapper/samizdatcrypt 96 local blockdev=/dev/mapper/samizdatcrypt fs
60 losetup -f /cdrom/live/filesystem.btrfs || return 97 for fs in /cdrom/live/*.btrfs; do
98 losetup -f "$fs" || return
99 done
61 modprobe btrfs || return 100 modprobe btrfs || return
62 btrfs device scan || return 101 btrfs device scan || return
63 mount -t btrfs -o subvol=ROOT "$blockdev" /root || return 102 mount -t btrfs -o subvol=ROOT "$blockdev" /root || return
103 LoSetup -D
64 bootdone root-mounted 104 bootdone root-mounted
65} 105}
66 106