[PATCH 1/1] isar-apt: support further optional fields in Release

["'Felix Moessbauer' via isar-users" <isar-users@googlegroups.com>]

The isar-apt repository is a proper apt repository which can be
distributed as-is. A common use-case for that is to build packages which
are then used in a standard Debian by adding the repository to the apt
sources. In this case, it is desired to fill some of the optional fields
in Release to enable fine-grained pinnings.

We extend the repo_create function to allow appending arbitrary fields
to the Release file. To make that easy to use, we introduce the
ISAR_APT_OPT_FIELD bitbake var map. As the do_cache_config task now
depends on user-input, we also ensure it is rebuild when changed.

Signed-off-by: Felix Moessbauer <felix.moessbauer@siemens.com>
---
 RECIPE-API-CHANGELOG.md                    |  5 +++++
 meta/classes/repository.bbclass            | 10 ++++++++++
 meta/recipes-devtools/isar-apt/isar-apt.bb |  6 +++++-
 3 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/RECIPE-API-CHANGELOG.md b/RECIPE-API-CHANGELOG.md
index 64c0f34a..2801a177 100644
--- a/RECIPE-API-CHANGELOG.md
+++ b/RECIPE-API-CHANGELOG.md
@@ -714,3 +714,8 @@ For example, If `KERNEL_NAME` is configured as `foo` for arm64, now
 `linux-libc-dev-foo` and `linux-libc-dev-arm64-cross-foo` package will be
 generated. This will help to have multiple versions of linux-libc-dev packages
 available for respective bsps in apt feeds.
+
+### ISAR APT Repository
+
+Optional fields of the isar-apt repo can be controlled by adding to the
+`ISAR_APT_OPT_FIELD` map. Example: `ISAR_APT_OPT_FIELD[Origin]="isar"`.
diff --git a/meta/classes/repository.bbclass b/meta/classes/repository.bbclass
index bc5852a5..8fbceed6 100644
--- a/meta/classes/repository.bbclass
+++ b/meta/classes/repository.bbclass
@@ -4,12 +4,19 @@
 #
 # SPDX-License-Identifier: MIT
 
+def repo_expand_opt_fields(d, var):
+    f = d.getVarFlags(var)
+    if not f:
+        return ''
+    return '\n'.join('{}: {}'.format(k, v) for k, v in f.items())
+
 repo_create() {
     local dir="$1"
     local dbdir="$2"
     local codename="$3"
     local distros_in="$4"
     local keyfiles="$5"
+    local conf_append="$6"
 
     if [ -n "${GNUPGHOME}" ]; then
         export GNUPGHOME="${GNUPGHOME}"
@@ -27,6 +34,9 @@ repo_create() {
 	    done
 	    echo "SignWith: ${option}" >> "${dir}"/conf/distributions
         fi
+        if [ -n "${conf_append}" ]; then
+            echo "${conf_append}" >> "${dir}"/conf/distributions
+        fi
     fi
     if [ ! -d "${dbdir}" ]; then
         reprepro -b "${dir}" --dbdir "${dbdir}" export "${codename}"
diff --git a/meta/recipes-devtools/isar-apt/isar-apt.bb b/meta/recipes-devtools/isar-apt/isar-apt.bb
index 187784f9..cda7de89 100644
--- a/meta/recipes-devtools/isar-apt/isar-apt.bb
+++ b/meta/recipes-devtools/isar-apt/isar-apt.bb
@@ -9,6 +9,8 @@ inherit repository
 SRC_URI = "file://distributions.in"
 
 do_cache_config[lockfiles] = "${REPO_ISAR_DIR}/isar.lock"
+do_cache_config[vardeps] += "ISAR_APT_OPT_FIELD"
+do_cache_config[cleandirs] += "${REPO_ISAR_DIR}/${DISTRO}/conf"
 
 # Generate reprepro config for current distro if it doesn't exist. Once it's
 # generated, this task should do nothing.
@@ -16,7 +18,9 @@ do_cache_config() {
     repo_create "${REPO_ISAR_DIR}"/"${DISTRO}" \
         "${REPO_ISAR_DB_DIR}"/"${DISTRO}" \
         "${DEBDISTRONAME}" \
-        "${WORKDIR}/distributions.in"
+        "${WORKDIR}/distributions.in" \
+        "" \
+        "${@ repo_expand_opt_fields(d, 'ISAR_APT_OPT_FIELD')}"
 }
 
 addtask cache_config after do_unpack before do_build
-- 
2.49.0

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