Allow checking any runtime path for installing ever-larger packages.

CHECKREQS_DISK_RUNTIME=( /boot:40M /:350M /opt:500M )

Recent example of large packages:

gentoo-kernel-bin:
/     >=350MB/version (in /lib/modules)
/boot >=40MB/version

rust-bin:
/opt  >=450MB/version

Signed-off-by: Robin H. Johnson <robb...@gentoo.org>
---
 eclass/check-reqs.eclass | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/eclass/check-reqs.eclass b/eclass/check-reqs.eclass
index fac2f4553d74..1c59c69489a9 100644
--- a/eclass/check-reqs.eclass
+++ b/eclass/check-reqs.eclass
@@ -30,6 +30,13 @@
 # # install will need this much space in /var
 # CHECKREQS_DISK_VAR="1024M"
 #
+# # install will need this much space in listed paths.
+# CHECKREQS_DISK_RUNTIME=(
+#   /var:1G
+#   /boot/efi:32M
+#   /opt/giant-package-with-dedicated-disk:100G
+# )
+#
 # @CODE
 #
 # If you don't specify a value for, say, CHECKREQS_MEMORY, then the test is not
@@ -66,6 +73,11 @@ _CHECK_REQS_ECLASS=1
 # @DESCRIPTION:
 # How much space is needed in /var? Eg.: CHECKREQS_DISK_VAR=3000M
 
+# @ECLASS_VARIABLE: CHECKREQS_DISK_RUNTIME
+# @DEFAULT_UNSET
+# @DESCRIPTION:
+# How much space is needed in paths? Eg.: CHECKREQS_DISK_RUNTIME=( /:1G 
/var:5G )
+
 # @ECLASS_VARIABLE: CHECKREQS_DONOTHING
 # @USER_VARIABLE
 # @DEFAULT_UNSET
@@ -120,6 +132,7 @@ _check-reqs_prepare() {
        debug-print-function ${FUNCNAME} "$@"
 
        if [[ -z ${CHECKREQS_MEMORY} &&
+                       "${#CHECKREQS_DISK_RUNTIME[@]}" -eq 0 &&
                        -z ${CHECKREQS_DISK_BUILD} &&
                        -z ${CHECKREQS_DISK_USR} &&
                        -z ${CHECKREQS_DISK_VAR} ]]; then
@@ -161,6 +174,16 @@ _check-reqs_run() {
        fi
 
        if [[ ${MERGE_TYPE} != buildonly ]]; then
+               if [[ "${#CHECKREQS_DISK_RUNTIME[@]}" -gt 0 ]]; then
+                       for _path_size in "${CHECKREQS_DISK_RUNTIME[@]}"; do
+                               _path=${_path_size/:*}
+                               _size=${_path_size/*:}
+                               _check-reqs_disk \
+                                       "${EROOT%/}${_path}" "${_size}"
+                       done
+                       unset _path_size _path _size
+               fi
+
                [[ -n ${CHECKREQS_DISK_USR} ]] && \
                        _check-reqs_disk \
                                "${EROOT%/}/usr" \
-- 
2.43.0


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