projects / projects / geninitrd.git / blame
| Commit | Line | Data |
|---|---|---|
| 1cea325b ER |
1 | #!/bin/sh |
| 2 | # | |
| 3 | # geninitrd functions | |
| 4 | ||
| 5 | # Find root device from fstab. | |
| 6 | # | |
| 7 | # @param string $fstab location of /etc/fstab | |
| 1cea325b ER |
8 | # @return false on failure |
| 9 | # | |
| 10 | # Sets global variables: | |
| 11 | # - $rootdev | |
| 5101a385 | 12 | # - $rootdev_add |
| 1cea325b ER |
13 | # - $rootFS |
| 14 | # | |
| 15 | find_root() { | |
| 16 | local fstab="$1" | |
| ca2c2012 | 17 | local function="${PROGRAM:+$PROGRAM: }find_root" |
| 5101a385 | 18 | local rootopt |
| 1cea325b | 19 | |
| 5101a385 | 20 | eval $(awk '/^[\t ]*#/ {next} {if ( $2 == "/" ) {print "rootdev=\"" $1 "\"\nrootFs=\"" $3 "\"\nrootopt=\"" $4 "\""}}' $fstab) |
| 1cea325b ER |
21 | if [ -z "$rootdev" ]; then |
| 22 | echo >&2 "$function: can't find real device for rootfs" | |
| 23 | return 1 | |
| 24 | fi | |
| 25 | ||
| 5101a385 AM |
26 | # additional devices needed (xfs logdev) |
| 27 | rootdev_add=$(echo "$rootopt" | awk -F',' '{ for (i=1; i<=NF; i++) { if ($i ~ /^logdev=/) { gsub(/^logdev=/, NIL, $i); print $i; } } }') | |
| 28 | ||
| 1cea325b ER |
29 | case $rootdev in |
| 30 | LABEL=*) | |
| 31 | if [ ! -x /sbin/blkid ]; then | |
| 32 | echo >&2 "$function: /sbin/blkid is missing" | |
| 33 | return 2 | |
| 34 | fi | |
| 35 | ||
| 36 | local label=${rootdev#"LABEL="} | |
| 37 | local dev=$(/sbin/blkid -t LABEL="$label" -o device) | |
| 38 | if [ "$dev" -a -r "$dev" ]; then | |
| 39 | rootdev=$dev | |
| 40 | fi | |
| 41 | ;; | |
| 42 | ||
| 43 | UUID=*) | |
| 44 | if [ ! -x /sbin/blkid ]; then | |
| 45 | echo >&2 "$function: /sbin/blkid is missing" | |
| 46 | return 2 | |
| 47 | fi | |
| 48 | ||
| 49 | local uuid=${rootdev#"UUID="} | |
| 50 | local dev=$(/sbin/blkid -t UUID="$uuid" -o device) | |
| 51 | ||
| 52 | if [ "$dev" -a -r "$dev" ]; then | |
| 53 | rootdev=$dev | |
| 54 | fi | |
| 55 | ;; | |
| 56 | esac | |
| 57 | ||
| b6c4aab1 ER |
58 | if [[ "$rootdev" = /dev/dm-* ]]; then |
| 59 | local node | |
| 60 | node=$(dm_lvm2_name "$rootdev") || exit | |
| 61 | if [ "$node" ]; then | |
| 62 | rootdev="$node" | |
| 63 | fi | |
| 64 | fi | |
| 65 | ||
| 1cea325b ER |
66 | if [ ! -r "$rootdev" ]; then |
| 67 | echo >&2 "$function: can't find real device for $rootdev" | |
| 68 | return 1 | |
| 69 | fi | |
| 70 | ||
| 71 | return 0 | |
| 72 | } | |
| b6c4aab1 ER |
73 | |
| 74 | # resolve /dev/dm-0 to lvm2 node | |
| dc006e4d | 75 | # which they got from blkid program fs was specifed as UUID= in fstab |
| b6c4aab1 ER |
76 | dm_lvm2_name() { |
| 77 | local node="$1" | |
| 78 | ||
| 79 | # redirect output to tmpfile so we won't get subshell | |
| 80 | local tmp ret | |
| 81 | tmp=$(mktemp) || exit | |
| 82 | ||
| 83 | /sbin/lvdisplay -c 2>/dev/null | awk -F: '{print $1}' > $tmp | |
| 84 | while read dev; do | |
| 85 | count=$(ls -Ll $dev $node | awk '{print $5, $6}' | sort -u | wc -l) | |
| 86 | if [ "$count" = 1 ]; then | |
| 87 | ret="$dev" | |
| 88 | break | |
| 89 | fi | |
| 90 | done < $tmp | |
| 91 | rm -f $tmp | |
| 92 | ||
| 93 | if [ -z "$ret" ]; then | |
| 94 | ret=$node | |
| 95 | fi | |
| 96 | echo "$ret" | |
| 97 | } |