From: Ivy Foster
When curl calls alpm's dlcb, alpm calls the frontend's cb with the
following (dlsize, totalsize) arguments:
0, -1: initialize
0, 0: no change since last call
x {x>0, x0}: data downloaded, total size known
x {x>0}, x: download finished
If total size is not known, do not call frontend cb (no change to
original behavior); alpm's callback shouldn't be called if there is a
download error.
See agregory's original spec here:
https://wiki.archlinux.org/index.php/User:Apg#download_callback
---
lib/libalpm/dload.c | 22 ++++++++++++++++------
src/pacman/callback.c | 19 +++++++++++--------
2 files changed, 27 insertions(+), 14 deletions(-)
diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
index 31ae82c..f4e6a27 100644
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -126,14 +126,24 @@ static int dload_progress_cb(void *file, double dltotal, double dlnow,
}
/* initialize the progress bar here to avoid displaying it when
- * a repo is up to date and nothing gets downloaded */
- if(payload->prevprogress == 0) {
- payload->handle->dlcb(payload->remote_name, 0, (off_t)dltotal);
- }
-
+ * a repo is up to date and nothing gets downloaded.
+ * payload->handle->dlcb will receive the remote_name
+ * and the following arguments:
+ * 0, -1: download initialized
+ * 0, 0: non-download event
+ * x {x>0}, x: download complete
+ * x {x>0, x 0}: download progress, expected total is known */
+ if(current_size == total_size) {
+ payload->handle->dlcb(payload->remote_name, (off_t)dlnow, (off_t)dltotal);
+ } else if(!payload->prevprogress) {
+ payload->handle->dlcb(payload->remote_name, 0, -1);
+ } else if(payload->prevprogress == current_size) {
+ payload->handle->dlcb(payload->remote_name, 0, 0);
+ } else {
/* do NOT include initial_size since it wasn't part of the package's
* download_size (nor included in the total download size callback) */
- payload->handle->dlcb(payload->remote_name, (off_t)dlnow, (off_t)dltotal);
+ payload->handle->dlcb(payload->remote_name, (off_t)dlnow, (off_t)dltotal);
+ }
payload->prevprogress = current_size;
diff --git a/src/pacman/callback.c b/src/pacman/callback.c
index ab3e14f..7f72b84 100644
--- a/src/pacman/callback.c
+++ b/src/pacman/callback.c
@@ -678,8 +678,13 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
const unsigned short cols = getcols();
- if(config->noprogressbar || cols == 0 || file_total == -1) {
- if(file_xfered == 0) {
+ /* Nothing has changed since last callback; stop here */
+ if(file_xfered == 0 && file_total == 0) {
+ return;
+ }
+
+ if(config->noprogressbar || cols == 0) {
+ if(file_xfered == 0 && file_total == -1) {
printf(_("downloading %s...\n"), filename);
fflush(stdout);
}
@@ -710,14 +715,9 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
total = file_total;
}
- /* bogus values : stop here */
- if(xfered > total || xfered < 0) {
- return;
- }
-
/* this is basically a switch on xfered: 0, total, and
* anything else */
- if(file_xfered == 0) {
+ if(file_xfered == 0 && file_total == -1) {
/* set default starting values, ensure we only call this once
* if TotalDownload is enabled */
if(!totaldownload || (totaldownload && list_xfered == 0)) {
@@ -726,6 +726,9 @@ void cb_dl_progress(const char *filename, off_t file_xfered, off_t file_total)
rate_last = 0.0;
get_update_timediff(1);
}
+ } else if(xfered > total || xfered < 0) {
+ /* bogus values : stop here */
+ return;
} else if(file_xfered == file_total) {
/* compute final values */
int64_t timediff = get_time_ms() - initial_time;
--
2.9.0