[source] mvebu: use ptgen instead of fdisk to make the clearfog image script more portable

[LEDE Commits]

nbd pushed a commit to source.git, branch master:
https://git.lede-project.org/2d7d9baf1990dca93a2b200caf84eb782f23965d

commit 2d7d9baf1990dca93a2b200caf84eb782f23965d
Author: Felix Fietkau <nbd at nbd.name>
AuthorDate: Thu Sep 1 15:29:48 2016 +0200

    mvebu: use ptgen instead of fdisk to make the clearfog image script more portable
    
    Signed-off-by: Felix Fietkau <nbd at nbd.name>
---
 target/linux/mvebu/image/gen_mvebu_sdcard_img.sh | 72 ++++++------------------
 1 file changed, 17 insertions(+), 55 deletions(-)

diff --git a/target/linux/mvebu/image/gen_mvebu_sdcard_img.sh b/target/linux/mvebu/image/gen_mvebu_sdcard_img.sh
index 8725a37..1d874df 100755
--- a/target/linux/mvebu/image/gen_mvebu_sdcard_img.sh
+++ b/target/linux/mvebu/image/gen_mvebu_sdcard_img.sh
@@ -31,62 +31,27 @@ fi
 set -e
 
 # parameters
-IMGSIZE=$1
-OUTFILE="$2"
-BOOTLOADER="$3"
-
-# calculate number of partitions from argument list
-NUMPARTS=$#
-((NUMPARTS=(NUMPARTS-3)/3))
-
-# find required applications
-FDISK=$(env PATH="/usr/local/sbin:/usr/sbin:/sbin:$PATH" which fdisk)
+IMGSIZE=$1; shift
+OUTFILE="$1"; shift
+BOOTLOADER="$1"; shift
 
 # generate image file
 printf "Creating $OUTFILE from /dev/zero: "
 dd if=/dev/zero of="$OUTFILE" bs=512 count=1 >/dev/null
 printf "Done\n"
 
-# generate fdisk argument list
-printf "Generating fdisk argument list: "
-ARGSFILE=$(mktemp)
-
-# empty partition table
-printf "o\n" >> $ARGSFILE
-
-# actual partitions
-offset=2048
-for i in $(seq 1 1 $NUMPARTS); do
-	((n=3+3*i-2)); type=$(eval echo \${$n})
-	((n=3+3*i-1)); size=$(eval echo \${$n})
-	((end=offset+size-1))
-
-	printf "n\np\n%i\n\n%i\n" $i $end >> $ARGSFILE
-
-	# special case on first aprtition: fdisk wont ask which one
-	if [ $i -eq 1 ]; then
-		printf "t\n%s\n" $type >> $ARGSFILE
-	else
-		printf "t\n%i\n%s\n" $i $type >> $ARGSFILE
-	fi
-
-	# add this partitions size to offset for next partition
-	((offset=end+1))
+while [ "$#" -ge 3 ]; do
+	ptgen_args="$ptgen_args -p $(($2 / 2)) -S 0x$1"
+	parts="$parts$3 "
+	shift; shift; shift
 done
 
-# write and exit
-printf "w\n" >> $ARGSFILE
-
-printf "Done\n"
+head=16
+sect=63
 
 # create real partition table using fdisk
 printf "Creating partition table: "
-cat $ARGSFILE | $FDISK "$OUTFILE" >/dev/null
-printf "Done\n"
-
-# remove temporary files
-printf "Cleaning up: "
-rm -f $ARGSFILE
+set `ptgen -o "$OUTFILE" -h $head -s $sect -l 1024 $ptgen_args`
 printf "Done\n"
 
 # install bootloader
@@ -94,18 +59,15 @@ printf "Writing bootloader: "
 dd of="$OUTFILE" if="$BOOTLOADER" bs=512 seek=1 conv=notrunc 2>/dev/null
 printf "Done\n"
 
-# write partition data
-
-# offset of first partition is 2048
-offset=2048
-for i in $(seq 1 1 $NUMPARTS); do
-	((n=3+3*i-1)); size=$(eval echo \${$n})
-	((n=3+3*i));   img="$(eval echo \${$n})"
+i=1
+while [ "$#" -ge 2 ]; do
+	img="${parts%% *}"
+	parts="${parts#* }"
 
 	printf "Writing %s to partition %i: " "$img" $i
-	dd if="$img" of="$OUTFILE" bs=512 seek=$offset conv=notrunc 2>/dev/null
+	dd if="$img" of="$OUTFILE" bs=512 seek=$(($1 / 512)) conv=notrunc 2>/dev/null
 	printf "Done\n"
 
-	# add this partitions size to offset for next partition
-	((offset=offset+size))
+	let i=i+1
+	shift; shift
 done