usb.sh

1 files changed, 53 insertions, 0 deletions

diff --git a/src/usb.sh b/src/usb.sh
new file mode 100755
index 0000000..cd80d8f
--- /dev/null
+++ b/src/usb.sh
@@ -0,0 +1,53 @@
+#!/bin/bash
+
+die() { printf "%s: Error: %s\n" "$0" "$*" >&2; exit 1; }
+
+whole_device()
+{
+    case "$1" in
+        *-part?) false ;;
+        *-part??) false ;;
+        *-part???) false ;;
+        */usb\*) false ;;
+        *) true ;;
+    esac
+}
+
+confirm_usb()
+{
+    local msg="This will completely overwrite device:\n\n\t%s\n\nType 'yes' to confirm.\nContinue? "
+    printf "$msg" "$1" >&2
+    read line
+    case "$line" in
+        [yY][eE][sS]) return ;;
+        *) die "Aborted by user." ;;
+    esac
+}
+
+choose_usb()
+{
+    local devs maj
+    set -- /dev/disk/by-id/usb*
+    for dev; do
+        shift
+        whole_device "$dev" || continue
+        set -- "$@" "$dev"
+    done
+    if [ $# = 0 ]; then
+        die "no usb device found"
+    elif [ $# = 1 ]; then
+        confirm_usb "$1" || die impossible
+        USB="$1"
+    else
+        die "multiple USB devices connected and choice between them is unimplemented.  ($*)"
+    fi
+}
+
+choose_cdrom()
+{
+    die 'choose_cdrom: unimplemented; specify cdrom device with --out'
+}
+
+choose_usb
+echo USB=$USB
+