bkctld-rm: list jails from incs directory

We list jails in "incs" directory, not in "jails" directory so we can 
clean old incs after a jail is archived

CHANGELOG.md

@@ -14,6 +14,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 ### Changed
 
 * Better help message composition and formating
+* bkctld-rm: list jails from incs directory
 
 ### Deprecated
 

lib/bkctld-rm

@@ -92,7 +92,9 @@ trap "rm -f ${lock_file}; cleanup_tmp;" 0
 kill_or_clean_lockfile "${lock_file}"
 new_lock_file "${lock_file}"
 
-jails_list=$(jails_list)
+# We list jails in "incs" directory, not in "jails" directory
+# so we can clean old incs after a jail is archived
+jails_list=$(jails_with_incs_list)
 jails_total=$(echo $jails_list | wc -w)
 jails_count=0
 

lib/includes

@@ -129,12 +129,16 @@ is_btrfs() {
     test $inode -eq 256
 }
 
-# Returns the list of all jails
+# Returns the list of jails found in the "jails" directory (default)
 jails_list() {
     # TODO: try if this command works the same :
     # find "${JAILDIR}" -mindepth 1 -maxdepth 1 -type d -printf '%f\n'
     find "${JAILDIR}" -mindepth 1 -maxdepth 1 -type d | sed 's!.*/!!' | sort -h
 }
+# Returns the list of jails found in the "incs" directory
+jails_with_incs_list() {
+    find "${INCDIR}" -mindepth 1 -maxdepth 1 -type d | sed 's!.*/!!' | sort -h
+}
 # Returns the complete path of a jail
 jail_path() {
     jail_name=${1:?}