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bash-orig.sh
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#!/bin/bash
#
# processSfdisk() processes the output of sfdisk -d
# and creates a new sfdisk -d like output, applying
# the requested action. Read below to see the actions
#
# $1 the name of a file that is the output of sfdisk -d
# $2 is the action "resize|other?"
# $3 is the first parameter
# $4 is the second parameter
# ...
#
# actions:
# processSfdisk foo.sfdisk resize /dev/sda1 100000
# foo.sfdisk = sfdisk -d output
# resize = action
# /dev/sda1 = partition to modify
# 100000 = 1024 byte blocks size to make it
# output: new sfdisk -d like output
#
# processSfdisk foo.sfdisk move /dev/sda1 100000
# foo.sfdisk = sfdisk -d output
# move = action
# /dev/sda1 = partition to modify
# 100000 = 1024 byte blocks size to move it to
# output: new sfdisk -d like output
#
# processSfdisk foo.sfdisk filldisk /dev/sda 100000 1:3:6
# foo.sfdisk = sfdisk -d output
# filldisk = action
# /dev/sda = disk to modify
# 100000 = 1024 byte blocks size of disk
# 1:3:6 = partition numbers that are fixed in size, : separated
# output: new sfdisk -d like output
#
# example file data
# /dev/sda1 : start= 2048, size= 204800, Id= 7, bootable
# /dev/sda2 : start= 206848, size= 50573312, Id= 7
# /dev/sda3 : start= 50780160, size= 2048, Id=83
# /dev/sda4 : start= 50784254, size= 16322562, Id= 5
# /dev/sda5 : start= 50784256, size= 7811072, Id=83
# /dev/sda6 : start= 58597376, size= 8509440, Id=82
#
data=$1
minstart=`awk -F'[ ,]+' '/start/{if ($4) print $4}' $data | sort -n | head -1`;
chunksize="2048";
cat $data | awk -F, '\
function display_output(partition_names, partitions, part_device) { \
printf("unit: %s\n\n", unit); \
for(part_device in partition_names) { \
printf("%s : start=%9d, size=%9d, Id= %2s", \
partitions[part_device, "device"], \
partitions[part_device, "start"], \
partitions[part_device, "size"], \
partitions[part_device, "id"] \
); \
if(partitions[part_device, "flags"] != "") { \
printf(", %s\n", partitions[part_device, "flags"]); \
} else { \
printf("\n"); \
} \
} \
} \
function check_overlap(partition_names, partitions, new_part_device, new_start, new_size, \
extended_margin, new_type, new_part_number, part_device, \
p_type, p_start, p_size, p_part_number) { \
extended_margin = 2; \
new_type = partitions[new_part_device, "id"]; \
new_start = new_start + 0; \
new_size = new_size + 0; \
new_part_number = partitions[new_part_device, "number"] + 0; \
for(part_device in partition_names) { \
p_type = partitions[part_device, "id"]; \
p_start = partitions[part_device, "start"] + 0; \
p_size = partitions[part_device, "size"] + 0; \
p_part_number = partitions[part_device, "number"] + 0; \
# no overlap with self \
if(new_part_device == part_device) { continue; } \
# ignore empty partitions \
if(p_size == 0) { continue; } \
# extended partitions must overlap logical partitions, but leave room for the extended partition table \
if((p_type == "5" || p_type == "f") && (new_part_number >= 5)) { \
# new_start is outside of [p_start+margin, p_start + p_size) OR \
# new_start + new_size is outside of (p_start+margin, p_start + p_size] \
if((new_start < p_start + extended_margin || new_start >= p_start + p_size) || \
(new_start + new_size <= p_start + extended_margin || new_start + new_size > p_start + p_size)) { \
return 1; \
} \
} \
# extended partitions must overlap logical partitions, but leave room for the extended partition table \
else if((new_type == "5" || new_type == "f") && (p_part_number >= 5)) { \
# logical partition must be contained in extended partition \
# p_start is outside of [new_start+margin, new_start + new_size) OR \
# p_start + p_size is outside of (new_start+margin, new_start + new_size] \
if((p_start < new_start + extended_margin || p_start >= new_start + new_size) || \
(p_start + p_size <= new_start + extended_margin || p_start + p_size > new_start + new_size)) { \
return 1; \
} \
} \
# all other overlap possibilities \
else { \
# new_start is inside of [p_start, p_start + p_size) OR \
# new_start + new_size is inside of (p_start, p_start + p_size] \
if((new_start >= p_start && new_start < p_start + p_size) || \
(new_start + new_size > p_start && new_start + new_size <= p_start + p_size)) { \
return 1; \
} \
# p_start is inside of [new_start, new_start + new_size) OR \
# p_start + p_size is inside of (new_start, new_start + new_size] \
if((p_start >= new_start && p_start < new_start + new_size) || \
(p_start + p_size > new_start && p_start + p_size <= new_start + new_size)) { \
return 1; \
} \
} \
} \
return 0; \
} \
function check_all_partitions(partition_names, partitions, \
part_device, p_start, p_size) { \
for(part_device in partition_names) { \
p_start = partitions[part_device, "start"] + 0; \
p_size = partitions[part_device, "size"] + 0; \
if(check_overlap(partition_names, partitions, part_device, p_start, p_size) != 0) { \
printf("ERROR in new partition table, quitting.\n"); \
printf("ERROR: %s has an overlap.\n", part_device);
#exit(1); \
} \
} \
printf("# Partition table is consistent.\n"); \
} \
function resize_partition(partition_names, partitions, args, unit, \
part_device, new_start, new_size) { \
for(part_device in partition_names) { \
if(part_device == args[1]) { \
if(unit == "sectors") { \
new_start = partitions[part_device, "start"]; \
new_size = args[2]*2; \
if(check_overlap(partition_names, partitions, args[1], new_start, new_size) == 0) { \
partitions[args[1], "start"] = new_start; \
partitions[args[1], "size"] = new_size; \
} \
} \
} \
} \
}\
function move_partition(partition_names, partitions, args, unit, \
part_device, new_start, new_size) { \
for(part_device in partition_names) { \
if(part_device == args[1]) { \
if(unit == "sectors") { \
new_start = (args[2]*2); \
new_start = new_start - new_start % CHUNK_SIZE; \
if(new_start < MIN_START) { new_start = MIN_START; } \
new_size = partitions[part_device, "size"]; \
if(check_overlap(partition_names, partitions, args[1], new_start, new_size) == 0) { \
partitions[args[1], "start"] = new_start; \
partitions[args[1], "size"] = new_size; \
} \
} \
} \
} \
} \
function fill_disk(partition_names, partitions, args, unit, \
disk, disk_size, n, fixed_partitions, \
original_variable, original_fixed, \
new_variable, new_fixed, new_logical, \
part_device, p_type, p_number, p_size, found, i, \
partition_starts, ordered_starts, old_sorted_in, \
curr_start) { \
# processSfdisk foo.sfdisk filldisk /dev/sda 100000 1:3:6 \
# foo.sfdisk = sfdisk -d output \
# filldisk = action \
# /dev/sda = disk to modify \
# 100000 = 1024 byte blocks size of disk \
# 1:3:6 = partition numbers that are fixed in size, : separated \
disk = args[1]; \
disk_size = args[2]*2; \
# add swap partitions to the fixed list
for(part_device in partition_names) { \
p_type = partitions[part_device, "id"]; \
p_number = partitions[part_device, "number"] + ""; \
if(p_type == "82") { \
args[3] = args[3] ":" p_number; \
} \
} \
n = split(args[3], fixed_partitions, ":"); \
# \
# Find the total fixed and variable space \
# \
original_variable = 0; \
original_fixed = MIN_START; \
for(part_device in partition_names) { \
p_type = partitions[part_device, "id"]; \
p_number = partitions[part_device, "number"] + 0; \
p_size = partitions[part_device, "size"] + 0; \
partition_starts[partitions[part_device, "start"] + 0] = part_device; \
# skip extended partition, only count its logicals and the CHUNK for its partition table \
if(p_type == "5" || p_type == "f") { \
original_fixed += CHUNK_SIZE; \
continue; \
} \
if(p_size == 0) { fixed_partitions[part_device] = p_number; }; \
found = 0; for(i in fixed_partitions) { if(fixed_partitions[i] == p_number) { found = 1; } }; \
if(found) { \
original_fixed += partitions[part_device, "size"]; \
} else { \
original_variable += partitions[part_device, "size"]; \
} \
} \
# \
# Assign the new sizes to partitions \
# \
new_fixed = original_fixed; \
new_variable = disk_size - original_fixed; \
new_logical = 0; \
for(part_device in partition_names) { \
p_type = partitions[part_device, "id"]; \
p_number = partitions[part_device, "number"] + 0; \
p_size = partitions[part_device, "size"] + 0; \
found = 0; for(i in fixed_partitions) { if(fixed_partitions[i] == p_number) { found = 1; } }; \
if(p_type == "5" || p_type == "f") { \
partitions[part_device, "newsize"] = CHUNK_SIZE; \
} else if(found) { \
partitions[part_device, "newsize"] = p_size; \
} else { \
partitions[part_device, "newsize"] = (new_variable*p_size/original_variable); \
} \
partitions[part_device, "size"] = partitions[part_device, "newsize"] - partitions[part_device, "newsize"] % CHUNK_SIZE; \
if(p_number >= 5) { \
new_logical += partitions[part_device, "size"]; \
} \
} \
# \
# Assign the new size to the extended partition \
# \
for(part_device in partition_names) { \
p_type = partitions[part_device, "id"]; \
p_number = partitions[part_device, "number"] + 0; \
p_size = partitions[part_device, "size"] + 0; \
if(p_type == "5" || p_type == "f") { \
partitions[part_device, "newsize"] += new_logical; \
partitions[part_device, "size"] = partitions[part_device, "newsize"] - partitions[part_device, "newsize"] % CHUNK_SIZE; \
} \
} \
# \
# Assign the new start positions \
# \
asort(partition_starts, ordered_starts, "@ind_num_asc"); \
old_sorted_in = PROCINFO["sorted_in"]; \
PROCINFO["sorted_in"] = "@ind_num_asc"; \
curr_start = MIN_START; \
for(i in ordered_starts) { \
part_device = ordered_starts[i]; \
p_type = partitions[part_device, "id"]; \
p_size = partitions[part_device, "size"] + 0; \
if(p_size > 0) { \
partitions[part_device, "start"] = curr_start; \
} \
if(p_type == "5" || p_type == "f") { \
curr_start += CHUNK_SIZE; \
} else { \
curr_start += p_size; \
} \
} \
PROCINFO["sorted_in"] = old_sorted_in; \
check_all_partitions(partition_names, partitions); \
} \
BEGIN{ \
SUBSEP = ":"; \
action="'$2'"; \
args[1]="'$3'"; \
args[2]="'$4'"; \
args[3]="'$5'"; \
unit = ""; \
partitions[0] = ""; \
partition_names[0] = ""; \
CHUNK_SIZE = '$chunksize'; \
MIN_START = '$minstart'; \
} \
$1 ~ /^unit:/{ \
n = split($1, fields, " "); \
unit = fields[2]; \
} \
$1 ~ /start=/{ \
n = split($1, fields, ":"); \
\
n = split(fields[1], values, " "); \
gsub(/ /, "", values[1]); \
part_device = values[1]; \
partitions[part_device, "device"] = part_device; \
partition_names[part_device] = part_device; \
\
part_number = gensub(/^[^0-9]*/,"",1,part_device); \
partitions[part_device, "number"] = part_number; \
\
n = split(fields[2], values, "="); \
gsub(/ /, "", values[2]); \
part_start = values[2]; \
partitions[part_device, "start"] = part_start; \
\
n = split($2, values, "="); \
gsub(/ /, "", values[2]); \
part_size = values[2]; \
partitions[part_device, "size"] = part_size; \
\
n = split($3, values, "="); \
gsub(/ /, "", values[2]); \
part_id = values[2]; \
partitions[part_device, "id"] = part_id; \
\
if(NF > 3) { \
part_flags = $4; \
gsub(/ /, "", part_flags); \
} else { \
part_flags = ""; \
} \
partitions[part_device, "flags"] = part_flags; \
} \
END{ \
delete partitions[0]; \
delete partition_names[0]; \
if(action == "resize") { \
resize_partition(partition_names, partitions, args, unit);
} else if(action == "move") { \
move_partition(partition_names, partitions, args, unit);
} else if(action == "filldisk") { \
fill_disk(partition_names, partitions, args, unit);
} \
display_output(partition_names, partitions); \
} \
';