simplify snpshot autoincrement

Signed-off-by: Michel-FK <michel.stempin@funkey-project.com>

FunKey/board/funkey/rootfs-overlay/usr/local/sbin/snap

@@ -20,12 +20,8 @@ touch "${LOCK_FILE}"
 # Increment name and save snapshot
 SNAPSHOT_DIR=/mnt/funkey/snapshots
 mkdir -p "${SNAPSHOT_DIR}"
-last=$(cd ${SNAPSHOT_DIR}; ls IMG_*.PNG 2> /dev/null | tail -1 | sed 's/^IMG_\([0-9]\+\)\.PNG$/\1/')
-if [ "x${last}" = "x" ]; then
-    last=1
-else
-    last=$(expr $last + 1)
-fi
+last=$(cd ${SNAPSHOT_DIR}; ls IMG_*.PNG 2> /dev/null | tail -1 | sed 's/^IMG_0*\([0-9]\+\)\.PNG$/\1/')
+let last=${last}+1
 snapshot_file=$(printf "IMG_%04d.PNG" $last)
 notif_set 2 "   NEW SCREEENSHOT ${snapshot_file}"
 fbgrab "${SNAPSHOT_DIR}/${snapshot_file}" &

Recovery/board/funkey/rootfs-overlay/usr/local/sbin/snap

@@ -1,6 +1,7 @@
 #!/bin/sh
 
-SNAPSHOT_DIR=/mnt/funkey/snapshots
+# Uncomment the following line to get debug info
+#set -x
 
 # Check args
 if [ ${#} -ne 0 ]; then
@@ -8,14 +9,24 @@ if [ ${#} -ne 0 ]; then
     exit 1
 fi
 
-mkdir -p "${SNAPSHOT_DIR}"
-last=$(cd ${SNAPSHOT_DIR}; ls IMG_*.PNG 2> /dev/null | tail -1 | sed 's/^IMG_\([0-9]\+\)\.PNG$/\1/')
-if [ "x${last}" = "x" ]; then
-    last=1
-else
-    let last++
+# Lock file (necessary since fbgrab must run in bg not to block the buttons while gaming)
+LOCK_FILE="/var/lock/snap.lock"
+if [ -f "${LOCK_FILE}" ]; then
+    #echo "${LOCK_FILE} already exists"
+    exit 1
 fi
+touch "${LOCK_FILE}"
+
+# Increment name and save snapshot
+SNAPSHOT_DIR=/mnt/funkey/snapshots
+mkdir -p "${SNAPSHOT_DIR}"
+last=$(cd ${SNAPSHOT_DIR}; ls IMG_*.PNG 2> /dev/null | tail -1 | sed 's/^IMG_0*\([0-9]\+\)\.PNG$/\1/')
+let last=${last}+1
 snapshot_file=$(printf "IMG_%04d.PNG" $last)
-fbgrab "${SNAPSHOT_DIR}/${snapshot_file}"
-notif_disp 1 "   CAPTURE TO ${snapshot_file}"
+notif_set 2 "   NEW SCREEENSHOT ${snapshot_file}"
+fbgrab "${SNAPSHOT_DIR}/${snapshot_file}" &
+
+# Remove lock file
+rm -f "${LOCK_FILE}"
+
 exit 0