[gentoo-portage-dev] [PATCH v3] collision_protect: use dynamic report interval

[Fabian Groffen <grobian@gentoo.org>]

The reporting of files remaining can look somewhat odd since the report
interval is hardcoded to be per 1000 objects.  Adjust this interval to
be time based.  This means that modern (fast) machines likely will never
see the countdown messages at all.  On slow setups the message will be
informative that there is progress, albeit rather slowly.  While at it,
report percentage done.

Output before this patch:

 * checking 6158 files for package collisions
5158 files remaining ...
4158 files remaining ...
3158 files remaining ...
2158 files remaining ...
1158 files remaining ...
158 files remaining ...

Possible output after this patch on a slower machine:

 * checking 6158 files for package collisions
 48% done, 3145 files remaining ...
 96% done, 192 files remaining ...
100% done

Signed-off-by: Fabian Groffen <grobian@gentoo.org>
---
 lib/portage/dbapi/vartree.py | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/lib/portage/dbapi/vartree.py b/lib/portage/dbapi/vartree.py
index 4b91caea8..244195fad 100644
--- a/lib/portage/dbapi/vartree.py
+++ b/lib/portage/dbapi/vartree.py
@@ -3475,13 +3475,18 @@ class dblink(object):
 			symlink_collisions = []
 			destroot = self.settings['ROOT']
 			totfiles = len(file_list) + len(symlink_list)
+			tnow = time.time()
+			tinterv = 2  # seconds
+			ninterv = tnow + tinterv
 			showMessage(_(" %s checking %d files for package collisions\n") % \
 				(colorize("GOOD", "*"), totfiles))
 			for i, (f, f_type) in enumerate(chain(
 				((f, "reg") for f in file_list),
 				((f, "sym") for f in symlink_list))):
-				if i % 1000 == 0 and i != 0:
-					showMessage(_("%d files remaining ...\n") % (totfiles - i))
+				if time.time() > ninterv:
+					showMessage(_("%3d%% done, %d files remaining ...\n") %
+							(i * 100 / totfiles, totfiles - i))
+					ninterv = time.time() + tinterv
 
 				dest_path = normalize_path(
 					os.path.join(destroot, f.lstrip(os.path.sep)))
@@ -3570,6 +3575,8 @@ class dblink(object):
 							break
 					if stopmerge:
 						collisions.append(f)
+			if tnow + tinterv < ninterv:
+				showMessage(_("100% done\n"))
 			return collisions, dirs_ro, symlink_collisions, plib_collisions
 
 	def _lstat_inode_map(self, path_iter):
-- 
2.20.1