[Buildroot] [PATCH buildroot-test] autobuild-run: add --flush-downloads argument to prevent false NOK due to not enough space on hard drive

[Giulio Benetti]

Some server/pc can have little hard drive, but high speed internet
connection. If disk is little, autobuild-run could generate some false
NOK reporting:
Fatal error: ...: No space left on device

Add --flush-downloads argument to autobuild-run to delete entire
instance-*/dl/ folder everytime it creates a new instance.
If active this will lead to re-download all files needed by an instance
in its dl/ folder when created.
As the other options, flush-downloads can be listed in .conf file like
this:
flush-downloads = yes

Signed-off-by: Giulio Benetti <giulio.benetti at micronovasrl.com>
---
 scripts/autobuild-run | 36 +++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/scripts/autobuild-run b/scripts/autobuild-run
index 3d2e99a..2682239 100755
--- a/scripts/autobuild-run
+++ b/scripts/autobuild-run
@@ -106,6 +106,7 @@ Options:
   --toolchains-csv CSVFILE       Toolchain configuration file
   -r, --repo URL                 URL of Buildroot repository to clone
                                  Defaults to %(--repo)s
+  --flush-downloads              Delete dl/ folder every time new instance starts
 
 Format of the configuration file:
 
@@ -301,18 +302,26 @@ def prepare_build(**kwargs):
             for i in f:
                 yield os.path.join(r, i)
 
-    # Remove 5 random files from the download directory. Removing
-    # random files from the download directory allows to ensure we
-    # regularly re-download files to check that their upstream
-    # location is still correct.
-    for i in range(0, 5):
-        flist = list(find_files(dldir))
-        if not flist:
-            break
-        f = flist[randint(0, len(flist) - 1)]
-        log_write(log, "INFO: removing %s from downloads" %
-                  os.path.relpath(f, dldir))
-        os.remove(f)
+    flush_dl = kwargs['flush_dl']
+
+    # Check if we need to flush dl/ folder or keep it
+    if flush_dl:
+        log_write(log, "INFO: flush dl/ folder")
+        # Remove entire dl/ folder
+        shutil.rmtree(dldir)
+    else:
+        # Remove 5 random files from the download directory. Removing
+        # random files from the download directory allows to ensure we
+        # regularly re-download files to check that their upstream
+        # location is still correct.
+        for i in range(0, 5):
+            flist = list(find_files(dldir))
+            if not flist:
+                break
+            f = flist[randint(0, len(flist) - 1)]
+            log_write(log, "INFO: removing %s from downloads" %
+                      os.path.relpath(f, dldir))
+            os.remove(f)
 
     branch = get_branch()
     log_write(log, "INFO: testing branch '%s'" % branch)
@@ -766,7 +775,8 @@ def main():
                 repo = args['--repo'],
                 upload = upload,
                 buildpid = buildpid,
-                debug = args['--debug']
+                debug = args['--debug'],
+                flush_dl = args['--flush-downloads']
             ))
         p.start()
         processes.append(p)
-- 
2.17.1