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, 2 insertions, 2 deletions

diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 95c817ea..9ffdebc5 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -535,8 +535,8 @@ const char *alpm_option_get_arch(alpm_handle_t *handle);
 /** Sets the targeted architecture. */
 int alpm_option_set_arch(alpm_handle_t *handle, const char *arch);
 
-int alpm_option_get_usedelta(alpm_handle_t *handle);
-int alpm_option_set_usedelta(alpm_handle_t *handle, int usedelta);
+double alpm_option_get_deltaratio(alpm_handle_t *handle);
+int alpm_option_set_deltaratio(alpm_handle_t *handle, double ratio);
 
 int alpm_option_get_checkspace(alpm_handle_t *handle);
 int alpm_option_set_checkspace(alpm_handle_t *handle, int checkspace);