Fix set -e compatibility in lib functions

- Replace [[ ]] && error pattern with if/then/fi
- Pattern causes exit when condition is false with set -e
- Fixed in: common.sh, config.sh, disk.sh, install-archzfs

Discovered during VM testing: the && short-circuit returns exit
code 1 when condition is false, triggering set -e to abort.

4 files changed, 17 insertions, 11 deletions

diff --git a/custom/install-archzfs b/custom/install-archzfs
index 6f098cc..6332286 100755
--- a/custom/install-archzfs
+++ b/custom/install-archzfs
@@ -85,16 +85,16 @@ preflight_checks() {
 gather_input() {
     if [[ "$UNATTENDED" == true ]]; then
         # Validate required config values
-        [[ -z "$HOSTNAME" ]] && error "Config missing required: HOSTNAME"
-        [[ -z "$TIMEZONE" ]] && error "Config missing required: TIMEZONE"
-        [[ "$NO_ENCRYPT" != "yes" && -z "$ZFS_PASSPHRASE" ]] && error "Config missing required: ZFS_PASSPHRASE"
-        [[ -z "$ROOT_PASSWORD" ]] && error "Config missing required: ROOT_PASSWORD"
-        [[ ${#SELECTED_DISKS[@]} -eq 0 ]] && error "Config missing required: DISKS"
+        if [[ -z "$HOSTNAME" ]]; then error "Config missing required: HOSTNAME"; fi
+        if [[ -z "$TIMEZONE" ]]; then error "Config missing required: TIMEZONE"; fi
+        if [[ "$NO_ENCRYPT" != "yes" && -z "$ZFS_PASSPHRASE" ]]; then error "Config missing required: ZFS_PASSPHRASE"; fi
+        if [[ -z "$ROOT_PASSWORD" ]]; then error "Config missing required: ROOT_PASSWORD"; fi
+        if [[ ${#SELECTED_DISKS[@]} -eq 0 ]]; then error "Config missing required: DISKS"; fi
 
         # Set defaults for optional values
-        [[ -z "$LOCALE" ]] && LOCALE="en_US.UTF-8"
-        [[ -z "$KEYMAP" ]] && KEYMAP="us"
-        [[ -z "$ENABLE_SSH" ]] && ENABLE_SSH="yes"
+        [[ -z "$LOCALE" ]] && LOCALE="en_US.UTF-8" || true
+        [[ -z "$KEYMAP" ]] && KEYMAP="us" || true
+        [[ -z "$ENABLE_SSH" ]] && ENABLE_SSH="yes" || true
 
         # Determine RAID level if not specified
         if [[ -z "$RAID_LEVEL" && ${#SELECTED_DISKS[@]} -gt 1 ]]; then
diff --git a/custom/lib/common.sh b/custom/lib/common.sh
index a41441d..2f8844e 100644
--- a/custom/lib/common.sh
+++ b/custom/lib/common.sh
@@ -42,7 +42,9 @@ log() {
 #############################
 
 require_root() {
-    [[ $EUID -ne 0 ]] && error "This script must be run as root"
+    if [[ $EUID -ne 0 ]]; then
+        error "This script must be run as root"
+    fi
 }
 
 command_exists() {
diff --git a/custom/lib/config.sh b/custom/lib/config.sh
index 82f5d77..cec3d8c 100644
--- a/custom/lib/config.sh
+++ b/custom/lib/config.sh
@@ -122,6 +122,8 @@ validate_config() {
         ((errors++))
     fi
 
-    [[ $errors -gt 0 ]] && error "Config validation failed with $errors error(s)"
+    if [[ $errors -gt 0 ]]; then
+        error "Config validation failed with $errors error(s)"
+    fi
     info "Config validation passed"
 }
diff --git a/custom/lib/disk.sh b/custom/lib/disk.sh
index ea8c402..fa3dbd2 100644
--- a/custom/lib/disk.sh
+++ b/custom/lib/disk.sh
@@ -148,7 +148,9 @@ select_disks() {
         read -rp "Enter disk path(s) separated by space: " selected
     fi
 
-    [[ -z "$selected" ]] && error "No disk selected"
+    if [[ -z "$selected" ]]; then
+        error "No disk selected"
+    fi
 
     # Extract just the device paths (remove size/model info)
     SELECTED_DISKS=()