Allow UseDelta option to specify a delta ratio

Rework the frontend and backend to allow passing a ratio value in for
UseDelta rather than having a hardcoded #define-d 0.7 value always used.
This is useful for those with fast connections, who would likely benefit
from tuning this ratio to lower values; it is also useful for general
testing purposes.

The libalpm API changes for this, but we do support the old config file
format with a no-value 'UseDelta' option; in this case we simply use the
old default of 0.7.

We clamp the ratio values to a sane range between 0.0 and 2.0, allowing
ratios above 1.0 for testing purposes.

Signed-off-by: Dan McGee <dan@archlinux.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/libalpm/handle.h b/lib/libalpm/handle.h
index a64c5c9e..a090ae42 100644
--- a/lib/libalpm/handle.h
+++ b/lib/libalpm/handle.h
@@ -88,8 +88,8 @@ struct __alpm_handle_t {
 
 	/* options */
 	char *arch;              /* Architecture of packages we should allow */
+	double deltaratio;       /* Download deltas if possible; a ratio value */
 	int usesyslog;           /* Use syslog instead of logfile? */ /* TODO move to frontend */
-	int usedelta;            /* Download deltas if possible */
 	int checkspace;          /* Check disk space before installing */
 	alpm_siglevel_t siglevel;   /* Default signature verification level */