stagefiles: further robustify with auto filenames

as suggested by Raphaël

rather than have fixed stagefile filename strings at all in the scripts,
use `$(basename $0)` to use the name of the script (which is the same for
almost all cases anyway, and the stage files are supposed to be almost
exclusively unique per-script). we can thus simplify things by determining
the filename for most use cases within the functions themselves.

this does change the file used by a couple of scripts, affecting backwards
compatibility of executing live-build upon an existing partially or fully
completed build:
 - binary_grub-pc used "binary_grub"
 - chroot_includes used "includes.chroot"

care had to be taken for the following cases:
 - there are some cases like bootstrap_cache, source_debian and
   bootstrap_debootstrap which are dealing with more than one file, and/or
   otherwise a filename that is not specific to the script itself exactly,
   or should not be based upon its name.
 - some cases like chroot_cache, bootstrap_cache and
   chroot_install-packages need to append something to the end of the name
   depending upon which pass/action mode the script is being executed with.
 - furthermore in the bootstrap_cache case one of the filenames is used
   within the bootstrap_debootstrap and thus needs very careful handling
   to be certain that a change in filename of bootstrap_cache does not
   break bootstrap_debootstrap.

Gbp-Dch: Short

1 files changed, 3 insertions, 5 deletions

diff --git a/scripts/build/chroot_sysfs b/scripts/build/chroot_sysfs
index e4a1d5bb8..23a85bda1 100755
--- a/scripts/build/chroot_sysfs
+++ b/scripts/build/chroot_sysfs
@@ -24,14 +24,12 @@ Init_config_data "${@}"
 # Requiring stage file
 Require_stagefile config bootstrap
 
-STAGE_FILE="chroot_sysfs"
-
 case "${1}" in
 	install)
 		Echo_message "Begin mounting /sys..."
 
 		# Checking stage file
-		Check_stagefile "${STAGE_FILE}"
+		Check_stagefile
 
 		# Acquire lock file
 		Acquire_lockfile
@@ -43,7 +41,7 @@ case "${1}" in
 		mount -t sysfs -o x-gvfs-hide sysfs-live chroot/sys
 
 		# Creating stage file
-		Create_stagefile "${STAGE_FILE}"
+		Create_stagefile
 		;;
 
 	remove)
@@ -59,7 +57,7 @@ case "${1}" in
 		fi
 
 		# Removing stage file
-		Remove_stagefile "${STAGE_FILE}"
+		Remove_stagefile
 		;;
 
 	*)