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, 4 deletions

diff --git a/scripts/build/bootstrap_debootstrap b/scripts/build/bootstrap_debootstrap
index f0262aa8c..fd212bb1e 100755
--- a/scripts/build/bootstrap_debootstrap
+++ b/scripts/build/bootstrap_debootstrap
@@ -37,10 +37,9 @@ Echo_message "Begin bootstrapping system..."
 Check_package chroot bin/debootstrap debootstrap
 
 # Checking stage file
-Check_stagefile bootstrap
+Check_stagefile "bootstrap"
 # Note, this must match that used in `bootstrap_cache`
-STAGE_FILE="bootstrap_cache.restore"
-Check_stagefile "${STAGE_FILE}"
+Check_stagefile "bootstrap_cache.restore"
 
 # Acquire lock file
 Acquire_lockfile
@@ -120,4 +119,4 @@ rm -f chroot/etc/hosts
 rm -f chroot/var/cache/apt/archives/*.deb
 
 # Creating stage file
-Create_stagefile bootstrap
+Create_stagefile "bootstrap"