pkgs/misc/drivers/epkowa/firmware_location.patch

   1 Explanation:
   2 in libesci-interpreter-gt-f720.so in
   3 libesci_interpreter_gt_f720_342::libesci_interpreter_gt_f720_348 at 0xdf74: the
   4 binary blob esfw8b.bin is searched either in /usr/share/esci/ or in
   5 $ESCI_FIRMWARE_DIR. But since this library is to be used wia libsane.so in
   6 every binary in the system, we can't wrapProgram the relevant executables to
   7 set this environment variable. Instead, we patch iscan to set this variable
   8 before loading libesci-interpreter-gt-f720.so.
   9 --- backend/channel-usb.c.orig  2017-08-14 11:24:27.669582456 +0200
  10 +++ backend/channel-usb.c       2017-08-14 11:31:40.509010897 +0200
  11 @@ -169,6 +169,10 @@
  12  {
  13    SANE_Status s;
  14
  15 +  setenv("ESCI_FIRMWARE_DIR", NIX_ESCI_PREFIX, 1);
  16 +  setenv("ISCAN_FW_DIR", NIX_ESCI_PREFIX, 1);
  17 +  setenv("ISCAN_FIRMWARE_DIR", NIX_ESCI_PREFIX, 1);
  18 +
  19    s = sanei_usb_open (self->name, &self->fd);
  20
  21    if (SANE_STATUS_GOOD == s)