[PATCH 2/5] bitbake-setup: ensure paths with timestamps in them are unique

[Alexander Kanavin <alex.kanavin@gmail.com>]

From: Alexander Kanavin <alex@linutronix.de>

There have been instances where directories with timestamps
in them are created within the same second, and their paths
clash as the timestamp in them is the same for both, as the
timestamp is accurate to 1 second.

This adds a check for the directory existence and then adds
an ever-increasing counter until there's a path that isn't yet
created.

[YOCTO #16121]

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
---
 bin/bitbake-setup | 18 ++++++++++++++----
 1 file changed, 14 insertions(+), 4 deletions(-)

diff --git a/bin/bitbake-setup b/bin/bitbake-setup
index 06255b112..4ccf47e87 100755
--- a/bin/bitbake-setup
+++ b/bin/bitbake-setup
@@ -93,6 +93,17 @@ def _write_layer_list(dest, repodirs):
     with open(layers_f, 'w') as f:
         json.dump({"version":"1.0","layers":layers}, f, sort_keys=True, indent=4)
 
+def add_unique_timestamp_to_path(path):
+    timestamp = time.strftime("%Y%m%d%H%M%S")
+    path_unique = "{}.{}".format(path, timestamp)
+    if os.path.exists(path_unique):
+        import itertools
+        for i in itertools.count(start=1):
+            path_unique = "{}.{}.{}".format(path, timestamp, i)
+            if not os.path.exists(path_unique):
+                break
+    return path_unique
+
 def checkout_layers(layers, layerdir, d):
     def _checkout_git_remote(r_remote, repodir, layers_fixed_revisions):
         rev = r_remote['rev']
@@ -242,9 +253,8 @@ def setup_bitbake_build(bitbake_config, layerdir, setupdir, thisdir, update_bb_c
         raise Exception("Cannot complete setting up a bitbake build directory from OpenEmbedded template '{}' as oe-setup-build was not found in any layers; please use oe-init-build-env manually.".format(template))
 
     bitbake_confdir = os.path.join(bitbake_builddir, 'conf')
-    timestamp = time.strftime("%Y%m%d%H%M%S")
-    backup_bitbake_confdir = os.path.join(bitbake_builddir, 'conf-backup.{}'.format(timestamp))
-    upstream_bitbake_confdir = os.path.join(bitbake_builddir, 'conf-upstream.{}'.format(timestamp))
+    backup_bitbake_confdir = add_unique_timestamp_to_path(os.path.join(bitbake_builddir, 'conf-backup'))
+    upstream_bitbake_confdir = add_unique_timestamp_to_path(os.path.join(bitbake_builddir, 'conf-upstream'))
 
     if os.path.exists(bitbake_confdir):
         os.rename(bitbake_confdir, backup_bitbake_confdir)
@@ -760,7 +770,7 @@ def install_buildtools(top_dir, settings, args, d):
         shutil.rmtree(buildtools_install_dir)
 
     install_buildtools = os.path.join(args.setup_dir, 'layers/oe-scripts/install-buildtools')
-    buildtools_download_dir = os.path.join(args.setup_dir, 'buildtools-downloads/{}'.format(time.strftime("%Y%m%d%H%M%S")))
+    buildtools_download_dir = add_unique_timestamp_to_path(os.path.join(args.setup_dir, 'buildtools-downloads/buildtools'))
     logger.plain("Buildtools archive is downloaded into {} and its content installed into {}".format(buildtools_download_dir, buildtools_install_dir))
     subprocess.check_call("{} -d {} --downloads-directory {}".format(install_buildtools, buildtools_install_dir, buildtools_download_dir), shell=True)
 
-- 
2.47.3