Added support for .lastupdate files (from pacman 2.9.1)

4 files changed, 93 insertions, 18 deletions

diff --git a/lib/libalpm/alpm.c b/lib/libalpm/alpm.c
index 94c8d2dc..93ac2fad 100644
--- a/lib/libalpm/alpm.c
+++ b/lib/libalpm/alpm.c
@@ -205,17 +205,31 @@ int alpm_db_unregister(PM_DB *db)
 	return(0);
 }
 
-int alpm_db_update(char *treename, char *archive)
+int alpm_db_getlastupdate(PM_DB *db, char *ts)
 {
 	/* Sanity checks */
-	ASSERT(handle != NULL, return(-1));
-	ASSERT(treename != NULL && strlen(treename) != 0, RET_ERR(PM_ERR_WRONG_ARGS, -1));
+	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
+	ASSERT(db != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
+
+	return(db_getlastupdate(db, handle->root, handle->dbpath, ts));
+}
+
+int alpm_db_update(PM_DB *db, char *archive, char *ts)
+{
+	/* Sanity checks */
+	ASSERT(handle != NULL, RET_ERR(PM_ERR_HANDLE_NULL, -1));
+	ASSERT(db != NULL, RET_ERR(PM_ERR_WRONG_ARGS, -1));
+
+	/* ORE
+	Does it make sense to update the 'local' database, or should we prevent it? */
+
+	/* ORE
+	check if the database is registered: if not, return an error */
 
 	/* ORE
-	Does it make sense to update the 'local' database, or should we prevent it?
-	stat(archive); */
+	stat() the archive to check it exists */
 
-	return(db_update(handle->root, handle->dbpath, treename, archive));
+	return(db_update(db, handle->root, handle->dbpath, archive, ts));
 }
 
 PM_PKG *alpm_db_readpkg(PM_DB *db, char *name)
diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
index 8eb1ece0..6b69b3b0 100644
--- a/lib/libalpm/alpm.h
+++ b/lib/libalpm/alpm.h
@@ -98,7 +98,8 @@ int alpm_get_option(unsigned char parm, long *data);
 int alpm_db_register(char *treename, PM_DB **db);
 int alpm_db_unregister(PM_DB *db);
 
-int alpm_db_update(char *treename, char *archive);
+int alpm_db_getlastupdate(PM_DB *db, char *ts);
+int alpm_db_update(PM_DB *db, char *archive, char *ts);
 
 PM_PKG *alpm_db_readpkg(PM_DB *db, char *name);
 PM_LIST *alpm_db_getpkgcache(PM_DB *db);
diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
index c555f256..7768b8a5 100644
--- a/lib/libalpm/db.c
+++ b/lib/libalpm/db.c
@@ -97,34 +97,92 @@ int db_create(char *root, char *dbpath, char *treename)
 	return(0);
 }
 
-int db_update(char *root, char *dbpath, char *treename, char *archive)
+/* reads dbpath/.lastupdate and populates *ts with the contents.
+ * *ts should be malloc'ed and should be at least 15 bytes.
+ *
+ * Returns 0 on success, 1 on error
+ *
+ */
+int db_getlastupdate(pmdb_t *db, char *root, char *dbpath, char *ts)
+{
+	FILE *fp;
+	char path[PATH_MAX];
+
+	if(db == NULL) {
+		return(-1);
+	}
+
+	/* get the last update time, if it's there */
+	snprintf(path, PATH_MAX, "%s%s/%s/.lastupdate", root, dbpath, db->treename);
+	if((fp = fopen(path, "r")) == NULL) {
+		return(-1);
+	} else {
+		char line[256];
+		if(fgets(line, sizeof(line), fp)) {
+			strncpy(ts, line, 15); /* YYYYMMDDHHMMSS */
+			ts[14] = '\0';
+		} else {
+			fclose(fp);
+			return(-1);
+		}
+	}
+	fclose(fp);
+	return(0);
+}
+
+int db_update(pmdb_t *db, char *root, char *dbpath, char *archive, char *ts)
 {
-	char ldir[PATH_MAX];
+	char path[PATH_MAX];
+
+	if(db == NULL) {
+		return(-1);
+	}
+
+	snprintf(path, PATH_MAX, "%s%s/%s", root, dbpath, db->treename);
+
+	/* ORE
+	if(ts && strlen(ts)) {
+		Should we refuse to update the db if it is already uptodate?
+		if(ts != db_getlastupdate(db)) {
+			RET_ERR(PM_ERR_DB_UPTODATE, -1);
+		}
+	}*/
 
-	snprintf(ldir, PATH_MAX, "%s%s/%s", root, dbpath, treename);
 	/* remove the old dir */
 	/* ORE - do we want to include alpm.h and use the log mechanism from db.c?
-	_alpm_log(PM_LOG_FLOW2, "removing %s (if it exists)\n", ldir);*/
+	_alpm_log(PM_LOG_FLOW2, "removing %s (if it exists)\n", path);*/
 	/* ORE
 	We should only rmrf the database content, and not the top directory, in case
 	a (DIR *) structure is associated with it (i.e a call to db_open). */
-	_alpm_rmrf(ldir);
+	_alpm_rmrf(path);
 
 	/* make the new dir */
-	if(db_create(root, dbpath, treename) != 0) {
+	if(db_create(root, dbpath, db->treename) != 0) {
 		return(-1);
 	}
 
 	/* uncompress the sync database */
 	/* ORE
 	_alpm_log(PM_LOG_FLOW2, "Unpacking %s...\n", archive);*/
-	if(_alpm_unpack(archive, ldir, NULL)) {
+	if(_alpm_unpack(archive, path, NULL)) {
 		return(-1);
 	}
 
-	/* ORE
-	Should we let the the library manage updates only if needed?
-	Create a .lastupdate file in ldir? Ask for a timestamp as db_update argument? */
+	/* writes the db->path/.lastupdate with the contents of *ts */
+	if(ts && strlen(ts)) {
+		FILE *fp;
+		char file[PATH_MAX];
+
+		snprintf(file, PATH_MAX, "%s/.lastupdate", path);
+		if((fp = fopen(file, "w")) == NULL) {
+			return(-1);
+		}
+		if(fputs(ts, fp) <= 0) {
+			fclose(fp);
+			return(-1);
+		}
+		fclose(fp);
+	}
 
 	return(0);
 }
diff --git a/lib/libalpm/db.h b/lib/libalpm/db.h
index 07fa1ef2..e2cd8aa9 100644
--- a/lib/libalpm/db.h
+++ b/lib/libalpm/db.h
@@ -48,7 +48,9 @@ typedef struct __pmdb_t {
 pmdb_t *db_open(char *root, char *dbpath, char *treename);
 void db_close(pmdb_t *db);
 int db_create(char *root, char *dbpath, char *treename);
-int db_update(char *root, char *dbpath, char *treename, char *archive);
+
+int db_getlastupdate(pmdb_t *db, char *root, char *dbpath, char *ts);
+int db_update(pmdb_t *db, char *root, char *dbpath, char *archive, char *ts);
 
 void db_rewind(pmdb_t *db);
 pmpkg_t *db_scan(pmdb_t *db, char *target, unsigned int inforeq);