From 46322535c1020fb4ee8392e540f5b65740842d30 Mon Sep 17 00:00:00 2001
From: Eric Hameleers <alien@slackware.com>
Date: Sun, 7 Jan 2024 19:46:43 +0100
Subject: liveinit: move partition scan into a new function for potential reuse

---
 liveinit.tpl | 56 +++++++++++++++++++++++++++++++++++++-------------------
 1 file changed, 37 insertions(+), 19 deletions(-)

diff --git a/liveinit.tpl b/liveinit.tpl
index e00d984..cc292a9 100644
--- a/liveinit.tpl
+++ b/liveinit.tpl
@@ -797,6 +797,37 @@ if [ "$RESCUE" = "" ]; then
     fi
   }
 
+  # Find partition on which a file resides:
+  # Function input:
+  # (param 1) Full path to the file we are looking for
+  # (param 2) Directory to mount the partition containing our file
+  # Use $(df $MYMNT |tail -1 |tr -s ' ' |cut -d' ' -f1) to find that partition,
+  # it will remain mounted on the provided mountpoint upon function return.
+  scan_part() {
+    local FILEPATH="$1"
+    local MYMNT="$2"
+    local ISOPART=""
+    local PARTFS=""
+    echo "${MARKER}:  Scanning for '$FILEPATH'..."
+    for ISOPART in $(ret_partition $(blkid |cut -d: -f1)) $(ret_blockdev $(blkid |cut -d: -f1)) ; do
+      PARTFS=$(blkid $ISOPART |rev |cut -d'"' -f2 |rev)
+      mount -t $PARTFS -o ro $ISOPART ${MYMNT}
+      if [ -f "${MYMNT}/${FILEPATH}" ]; then
+        # Found our file!
+        unset ISOPART
+        break
+      else
+        umount $ISOPART
+      fi
+    done
+    if [ -n "$ISOPART" ]; then
+      echo "${MARKER}:  Partition scan unable to find $(basename $FILEPATH), trouble ahead."
+      return 1
+    else
+      return 0
+    fi
+  } # End scan_part()
+
   ## End support functions ##
 
   # We need a mounted filesystem here to be able to do a switch_root later,
@@ -958,25 +989,12 @@ if [ "$RESCUE" = "" ]; then
         mkdir -p ${SUPERMNT}
         #
         if [ "$LIVEMEDIA" = "scandev" ]; then
-          # Scan partitions to find the one with the ISO and set LIVEMEDIA:
-          echo "${MARKER}:  Scanning for '$LIVEPATH'..."
-          for ISOPART in $(ret_partition $(blkid |cut -d: -f1)) $(ret_blockdev $(blkid |cut -d: -f1)) ; do
-            PARTFS=$(blkid $ISOPART |rev |cut -d'"' -f2 |rev)
-            # Abuse the $SUPERMNT a bit, we will actually use it later:
-            mount -t $PARTFS -o ro $ISOPART ${SUPERMNT}
-            if [ -f ${SUPERMNT}/${LIVEPATH} ]; then
-              # Found our ISO!
-              LIVEMEDIA=$ISOPART
-              umount $ISOPART
-              unset ISOPART
-              break
-            else
-              umount $ISOPART
-            fi
-          done
-          if [ -n "$ISOPART" ]; then
-            echo "${MARKER}:  Partition scan unable to find ISO, trouble ahead."
-          fi
+          # Scan partitions to find the one with the ISO and set LIVEMEDIA.
+          # Abuse the $SUPERMNT a bit, we will actually use it later.
+          # TODO: proper handling of scan_part return code.
+          scan_part ${LIVEPATH} ${SUPERMNT}
+          LIVEMEDIA="$(df ${SUPERMNT} 2>/dev/null |tail -1 |tr -s ' ' |cut -d' ' -f1)"
+          umount ${SUPERMNT}
         fi
         # At this point we know $LIVEMEDIA - either because the bootparameter
         # specified it or else because the 'scandev' found it for us.
-- 
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