Get estimated package count when populating databases

This works for both local and sync databases in slightly different ways. For
the local database, we can use the directory hard link count on the local/
folder. For sync databases, we use the archive size coupled with some
computed average per-package sizes to determine an estimate.

This is currently a dead assignment once calculated, but could be used to
set the initial size of a hash table.

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

1 files changed, 7 insertions, 1 deletions

diff --git a/lib/libalpm/be_local.c b/lib/libalpm/be_local.c
index c7110faf..b97fca71 100644
--- a/lib/libalpm/be_local.c
+++ b/lib/libalpm/be_local.c
@@ -367,7 +367,8 @@ static int is_dir(const char *path, struct dirent *entry)
 
 static int local_db_populate(pmdb_t *db)
 {
-	int count = 0;
+	int est_count, count = 0;
+	struct stat buf;
 	struct dirent *ent = NULL;
 	const char *dbpath;
 	DIR *dbdir;
@@ -384,6 +385,11 @@ static int local_db_populate(pmdb_t *db)
 	if(dbdir == NULL) {
 		return(0);
 	}
+	if(fstat(dirfd(dbdir), &buf) != 0) {
+		return(0);
+	}
+	/* subtract the two always-there pointers to get # of children */
+	est_count = (int)buf.st_nlink - 2;
 	while((ent = readdir(dbdir)) != NULL) {
 		const char *name = ent->d_name;