install.sh: fix four bugs found during live testing

Free-space start alignment
  parted reports free space starting at 0,02 MiB (before the GPT
  alignment boundary). The collect_free_space awk now rounds the start
  up to the next whole MiB (ceiling) and enforces a minimum of 1 MiB,
  then recomputes the usable size from the adjusted start. This prevents
  parted from being asked to create a partition at 0 MiB, which it
  cannot do.

Locale-independent partition creation
  The previous `printf 'Yes\n' | parted mkpart` relied on parted
  accepting an English answer to its alignment-confirmation prompt.
  On a German-locale system parted asks "Ist dies noch akzeptabel?"
  and ignores "Yes", causing mkpart to fail. Replaced with `parted -s`
  (script/non-interactive mode), consistent with every other parted
  call in the script.

Correct new-partition detection on disks with gaps
  The old heuristic took the highest partition number after partprobe.
  On a disk where existing partitions are numbered 2/3/4, a new
  partition in the gap before them receives number 1 — making the
  old heuristic point at partition 4 (the existing btrfs volume) and
  subsequently run mkfs.btrfs on it. The new awk matches by start
  position (OEMDRV_START ± 1 MiB) instead, which is unambiguous
  regardless of how numbers are assigned.

Infinite loop on EOF stdin
  When the selection while-loop's `read` hits EOF (e.g. stdin exhausted
  after sudo consumed a piped password), it returns exit code 1 with an
  empty INPUT, which falls through to "Invalid input." and spins
  forever. Added `|| { echo; echo "Aborted."; exit 0; }` to all three
  read calls in the loop.

install.md: drop stale install_from_repo.sh reference from title;
clarify that REPO_URL/REPO_BRANCH overrides are optional.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

install.md

@@ -1,4 +1,4 @@
-# OEMDRV Bootstrap — install.sh + install_from_repo.sh
+# OEMDRV Bootstrap — install.sh
 
 the script `./system_setup/install.sh` prepares a target machine for automated Fedora deployment. It shrinks an existing partition to carve out a dedicated **OEMDRV** partition, which Anaconda/Kickstart will detect automatically during installation.
 
@@ -37,7 +37,7 @@ curl -fsSL ${REPO_URL%.git}/raw/branch/${REPO_BRANCH:-main}/system_setup/install
 sudo -E bash /tmp/install.sh
 ```
 
-That way, install.sh should know what to pull.
+Both are optional. That way, install.sh should know what to pull.
 
 ## After the script completes
 

system_setup/install.sh

@@ -196,9 +196,12 @@ collect_free_space() {
                 $1+0 > 0 {
                     for (i = 1; i <= NF; i++) {
                         if ($i == "free") {
-                            start=$2; end=$3; size=$4;
+                            gsub(/MiB/,"",$2); gsub(/MiB/,"",$3);
-                            gsub(/MiB/,"",start); gsub(/MiB/,"",end); gsub(/MiB/,"",size);
+                            e=int($3+0);
-                            s=int(start+0); e=int(end+0); sz=int(size+0);
+                            raw_s=$2+0;
+                            s=int(raw_s)+(raw_s>int(raw_s)?1:0);
+                            if (s < 1) s = 1;
+                            sz=e-s;
                             if (sz >= min) print s " " e " " sz;
                             break
                         }
@@ -332,12 +335,12 @@ SEL=-1
 while true; do
     echo
     if [[ $FS_IDX -gt 0 && $shrink_count -gt 0 ]]; then
-        read -r -p "Enter  f<n>  to use free space,  s<n>  to shrink a partition, or  q  to quit: " INPUT
+        read -r -p "Enter  f<n>  to use free space,  s<n>  to shrink a partition, or  q  to quit: " INPUT || { echo; echo "Aborted."; exit 0; }
     elif [[ $FS_IDX -gt 0 ]]; then
-        read -r -p "Enter number of free space region to use, or  q  to quit: " INPUT
+        read -r -p "Enter number of free space region to use, or  q  to quit: " INPUT || { echo; echo "Aborted."; exit 0; }
         [[ "$INPUT" =~ ^[0-9]+$ ]] && INPUT="f${INPUT}"
     else
-        read -r -p "Enter number of partition to shrink, or  q  to quit: " INPUT
+        read -r -p "Enter number of partition to shrink, or  q  to quit: " INPUT || { echo; echo "Aborted."; exit 0; }
         [[ "$INPUT" =~ ^[0-9]+$ ]] && INPUT="s${INPUT}"
     fi
 
@@ -458,15 +461,16 @@ fi
 # ── Create OEMDRV partition ───────────────────────────────────────────────────
 
 info "Creating new OEMDRV partition (${OEMDRV_START}–${OEMDRV_END} MiB) on $WORK_DISK..."
-printf 'Yes\n' | parted "$WORK_DISK" mkpart anacondainstall btrfs "${OEMDRV_START}MiB" "${OEMDRV_END}MiB" \
+parted -s "$WORK_DISK" mkpart anacondainstall btrfs "${OEMDRV_START}MiB" "${OEMDRV_END}MiB" \
     || die "parted mkpart failed. Check that the target area is free space on $WORK_DISK."
 
 partprobe "$WORK_DISK"
 sleep 1
 
-# Determine new partition number (highest on the disk after partprobe)
+# Find the partition whose start matches OEMDRV_START (±1 MiB for alignment)
 NEW_PNUM=$(parted -s "$WORK_DISK" -m unit MiB print 2>/dev/null \
-    | awk -F: '/^[0-9]/{n=$1} END{print n}')
+    | awk -F: -v s="$OEMDRV_START" '
+        /^[0-9]/ { gsub(/MiB/,"",$2); if (int($2+0) >= s-1 && int($2+0) <= s+1) { print $1; exit } }')
 [[ -n "$NEW_PNUM" ]] || die "Could not determine new partition number on $WORK_DISK."
 
 OEMDRV_DEV=$(new_part_device "$WORK_DISK" "$NEW_PNUM")