[PATCH v2] deb-dl-dir: Fallback to copying when import-export

[Uladzimir Bely <ubely@ilbers.de>]

By default, hardlinks are used when doing DL_DIR import and export.
This fails if DL_DIR's filesystem differs from TMPDIR's one.

Fallback to file copying (with lower performance and huge disk usage)
in this case.

Signed-off-by: Uladzimir Bely <ubely@ilbers.de>
---
 meta/classes/deb-dl-dir.bbclass | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

Changes since v1:
 - Try create handrlink first and then copy if failed. It should better
handle hardlink issues that may happen even on the same partition.

diff --git a/meta/classes/deb-dl-dir.bbclass b/meta/classes/deb-dl-dir.bbclass
index 7db25251..4d5d4c9a 100644
--- a/meta/classes/deb-dl-dir.bbclass
+++ b/meta/classes/deb-dl-dir.bbclass
@@ -85,8 +85,11 @@ deb_dl_dir_import() {
         set -e
         printenv | grep -q BB_VERBOSE_LOGS && set -x
 
-        sudo find "${pc}" -type f -iname "*\.deb" -exec \
-            ln -Pf -t "${rootfs}"/var/cache/apt/archives/ {} +
+        find "${pc}" -type f -iname "*\.deb" |\
+        while read p; do
+            sudo ln -Pf -t "${rootfs}"/var/cache/apt/archives/ "$p" 2>/dev/null ||
+                sudo cp -n --no-preserve=owner -t "${rootfs}var/cache/apt/archives/" "$p"
+        done
     '
 }
 
@@ -109,7 +112,8 @@ deb_dl_dir_export() {
             if [ -n "$package" ]; then
                 cmp --silent "$package" "$p" && continue
             fi
-            sudo ln -Pf "${p}" "${pc}"
+            sudo ln -Pf "${p}" "${pc}" 2>/dev/null ||
+                sudo cp -n "${p}" "${pc}"
         done
         sudo chown -R $(id -u):$(id -g) "${pc}"
     '
-- 
2.20.1