[gentoo-portage-dev] [PATCH v2 1/3] pym/portage/package/ebuild/fetch.py: Factor out _get_checksum_failure_max_tries

[W. Trevor King]

The current fetch() function is quite long, which makes it hard to
know what I can change without adverse side effects.  By pulling this
logic out of the main function, we get clearer logic in fetch() and
more explicit input for the config extraction.
---
 pym/portage/package/ebuild/fetch.py | 59 +++++++++++++++++++++----------------
 1 file changed, 34 insertions(+), 25 deletions(-)

diff --git a/pym/portage/package/ebuild/fetch.py b/pym/portage/package/ebuild/fetch.py
index 5316f03..6f46572 100644
--- a/pym/portage/package/ebuild/fetch.py
+++ b/pym/portage/package/ebuild/fetch.py
@@ -240,6 +240,38 @@ _size_suffix_map = {
 	'Y' : 80,
 }
 
+
+def _get_checksum_failure_max_tries(settings, default=5):
+	"""
+	Get the maximum number of failed download attempts
+
+	Generally, downloading the same file repeatedly from
+	every single available mirror is a waste of bandwidth
+	and time, so there needs to be a cap.
+	"""
+	v = default
+	try:
+		v = int(settings.get("PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS",
+			default))
+	except (ValueError, OverflowError):
+		writemsg(_("!!! Variable PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"
+			" contains non-integer value: '%s'\n") % \
+			settings["PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"],
+			noiselevel=-1)
+		writemsg(_("!!! Using PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS "
+			"default value: %s\n") % default,
+			noiselevel=-1)
+		v = default
+	if v < 1:
+		writemsg(_("!!! Variable PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"
+			" contains value less than 1: '%s'\n") % v, noiselevel=-1)
+		writemsg(_("!!! Using PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS "
+			"default value: %s\n") % default,
+			noiselevel=-1)
+		v = default
+	return v
+
+
 def fetch(myuris, mysettings, listonly=0, fetchonly=0,
 	locks_in_subdir=".locks", use_locks=1, try_mirrors=1, digests=None,
 	allow_missing_digests=True):
@@ -263,31 +295,8 @@ def fetch(myuris, mysettings, listonly=0, fetchonly=0,
 			print(_(">>> \"mirror\" mode desired and \"mirror\" restriction found; skipping fetch."))
 			return 1
 
-	# Generally, downloading the same file repeatedly from
-	# every single available mirror is a waste of bandwidth
-	# and time, so there needs to be a cap.
-	checksum_failure_max_tries = 5
-	v = checksum_failure_max_tries
-	try:
-		v = int(mysettings.get("PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS",
-			checksum_failure_max_tries))
-	except (ValueError, OverflowError):
-		writemsg(_("!!! Variable PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"
-			" contains non-integer value: '%s'\n") % \
-			mysettings["PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"], noiselevel=-1)
-		writemsg(_("!!! Using PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS "
-			"default value: %s\n") % checksum_failure_max_tries,
-			noiselevel=-1)
-		v = checksum_failure_max_tries
-	if v < 1:
-		writemsg(_("!!! Variable PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS"
-			" contains value less than 1: '%s'\n") % v, noiselevel=-1)
-		writemsg(_("!!! Using PORTAGE_FETCH_CHECKSUM_TRY_MIRRORS "
-			"default value: %s\n") % checksum_failure_max_tries,
-			noiselevel=-1)
-		v = checksum_failure_max_tries
-	checksum_failure_max_tries = v
-	del v
+	checksum_failure_max_tries = _get_checksum_failure_max_tries(
+		settings=mysettings)
 
 	fetch_resume_size_default = "350K"
 	fetch_resume_size = mysettings.get("PORTAGE_FETCH_RESUME_MIN_SIZE")
-- 
1.8.5.2.8.g0f6c0d1