add: more partition related functions

- drive_list
- partition_list
- find_unused
- find_oldest
- find_newest
- version_from_partnum

drive.inc

@@ -23,4 +23,69 @@ function rename_partition
     parted -s "$drive" -- name "$partition" '"'"$new_label"'"'
 }
 
+function drive_list
+{
+    drives="$(lsblk -nd -o NAME,TYPE \
+        /dev/nvme+([0-9])n+([0-9]) /dev/sd+([a-z]) | \
+        grep ' disk'  |cut -d\  -f1)"
+}
+
+function partition_list
+{
+    local drive="$1"
+    partitions="$(parted -m "$drive" -- print| \
+        awk --field-separator=":" \
+        '{if (NR > 2)
+            print $1
+        }')"
+}
+
+function find_unused
+{
+    local drive="$1"
+    unused="$(parted -m "$drive" -- print|awk --field-separator=":" \
+        '{if (NR > 2 && $1 >= 2 && $6 == "root unused") {
+            print $1
+         }}')|head -1"
+}
+
+function find_oldest
+{
+    local drive="$1"
+    oldest="$(parted -m "$drive" -- print|awk --field-separator=":" \
+        'BEGIN 
+            {min="ZZZZ"}
+            {if (NR > 2 && $1 >= 2 && $1 <= 4 &&
+                           $6 < min && $6 != "root unused") {
+                min=$6; part=$1
+            }}
+        END
+        {print part}')"
+}
+
+function find_newest
+{
+    local drive="$1"
+    newest="$(parted -m "$drive" -- print|awk --field-separator=":" \
+        'BEGIN
+            {max=""}
+             {if (NR > 2 && $1 >= 2 && $1 <= 4 && 
+                            $6 > max && $6 != "root unused") {
+                 max=$6; part=$1
+             }}
+         END
+         {print part}')"
+}
+
+function version_from_partnum
+{
+    local drive="$1"
+    local partnum="$2"
+    version="$(parted -m "$drive" -- print|awk --field-separator=":" \
+        '{if (NR > 2 && $1 == "'"$partnum"') {
+             print $6
+         }}')"
+    version="$(echo "$version"|cut -d\  -f2)"
+}
+
 # vim: set ft=sh:

tests/data/rename.dat

@@ -1,7 +1,7 @@
 BYT;
 T_E_M_P:17.2GB:file:512:512:gpt::;
 1:1049kB:1074MB:1073MB::EFI system partition:boot, legacy_boot, esp;
-2:1075MB:2147MB:1073MB::root renamed:;
+2:1075MB:2147MB:1073MB::root 20210228:;
 3:2149MB:3221MB:1073MB::root unused:;
 4:3222MB:4295MB:1073MB::root unused:;
 5:4296MB:17.2GB:12.9GB::Encrypted:;

tests/drive.sh

@@ -3,16 +3,46 @@
 function test_partitioning()
 {
     local img
+    local test_version=20210228
+    local min_version=20210101
+    local max_version=20211231
+
     img=$(mktemp -u)
     dd if=/dev/zero of="$img" bs=1M seek=16384 count=0 2> /dev/null
+
     setup_drive "$img"
     output=$(parted -ms "$img" -- print)
     sed -i "s|T_E_M_P|$img|g;" tests/data/parted.dat
     assertEquals "$(cat tests/data/parted.dat)" "$output"
-    rename_partition "$img" 2 "root renamed"
+
+    rename_partition "$img" 2 "root $test_version"
     output=$(parted -ms "$img" -- print)
     sed -i "s|T_E_M_P|$img|g;" tests/data/rename.dat
     assertEquals "$(cat tests/data/rename.dat)" "$output"
+
+    version_from_partnum "$img" 2
+    assertEquals "$test_version" "$version"
+
+    version_from_partnum "$img" 3
+    assertEquals "$min_version" "$version"
+
+    version_from_partnum "$img" 4
+    assertEquals "$max_version" "$version"
+
+    find_unused "$img"
+    assertContains " 3 4 " "$unused"
+
+    rename_partition "$img" 3 "root $min_version"
+    find_oldest "$img"
+    assertEquals "$min_version" "$oldest"
+
+    rename_partition "$img" 4 "root $max_version"
+    find_newest "$img"
+    assertEquals "$max_version" "$newest"
+
+    partition-list "$img"
+    assertEquals "1 2 3 4 5" "$partitions"
+
     rm -f "$img"
 }