libalpm: simplify sync db lastupdate

Legacy code is hitting the trash here. Remove unnecessary _alpm_time2string
time storage abstraction in favor of just writing the time_t value to the
disk.

The only drawback is that everyone's sync DBs will have to be updated at
least once so that the lastupdate values are stored right. :)

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

lib/libalpm/be_files.c

@@ -747,52 +747,49 @@ int _alpm_db_remove(pmdb_t *db, pmpkg_t *info)
 	return(0);
 }
 
-/* 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
- *
+/*
+ * Return the last update time as number of seconds from the epoch.
+ * Returns 0 if the value is unknown or can't be read.
  */
-int _alpm_db_getlastupdate(const pmdb_t *db, char *ts)
+time_t _alpm_db_getlastupdate(const pmdb_t *db)
 {
 	FILE *fp;
 	char file[PATH_MAX];
+	time_t ret = 0;
 
 	ALPM_LOG_FUNC;
 
-	if(db == NULL || ts == NULL) {
-		return(-1);
+	if(db == NULL) {
+		return(ret);
 	}
 
 	snprintf(file, PATH_MAX, "%s.lastupdate", db->path);
 
 	/* get the last update time, if it's there */
 	if((fp = fopen(file, "r")) == NULL) {
-		return(-1);
+		return(ret);
 	} else {
-		char line[256];
+		char line[64];
 		if(fgets(line, sizeof(line), fp)) {
-			strncpy(ts, line, 14); /* YYYYMMDDHHMMSS */
-			ts[14] = '\0';
-		} else {
-			fclose(fp);
-			return(-1);
+			ret = atol(line);
 		}
 	}
 	fclose(fp);
-	return(0);
+	return(ret);
 }
 
-/* writes the dbpath/.lastupdate with the contents of *ts
+/*
+ * writes the dbpath/.lastupdate file with the value in time
  */
-int _alpm_db_setlastupdate(const pmdb_t *db, char *ts)
+int _alpm_db_setlastupdate(const pmdb_t *db, time_t time)
 {
 	FILE *fp;
 	char file[PATH_MAX];
+	int ret = 0;
 
 	ALPM_LOG_FUNC;
 
-	if(db == NULL || ts == NULL || strlen(ts) == 0) {
+	if(db == NULL || time == 0) {
 		return(-1);
 	}
 
@@ -801,13 +798,12 @@ int _alpm_db_setlastupdate(const pmdb_t *db, char *ts)
 	if((fp = fopen(file, "w")) == NULL) {
 		return(-1);
 	}
-	if(fputs(ts, fp) <= 0) {
-		fclose(fp);
-		return(-1);
+	if(fprintf(fp, "%ju", (uintmax_t)time) <= 0) {
+		ret = -1;
 	}
 	fclose(fp);
 
-	return(0);
+	return(ret);
 }
 
 /* vim: set ts=2 sw=2 noet: */

lib/libalpm/db.c

@@ -30,9 +30,11 @@
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
+#include <stdint.h> /* uintmax_t */
 #include <sys/stat.h>
 #include <dirent.h>
 #include <regex.h>
+#include <time.h>
 
 /* libalpm */
 #include "db.h"
@@ -221,8 +223,7 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
 	alpm_list_t *lp;
 	char path[PATH_MAX];
 	alpm_list_t *files = NULL;
-	char newmtime[16] = "";
-	char lastupdate[16] = "";
+	time_t newmtime = 0, lastupdate = 0;
 	const char *dbpath;
 	int ret;
 
@@ -245,9 +246,10 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
 
 	if(!force) {
 		/* get the lastupdate time */
-		_alpm_db_getlastupdate(db, lastupdate);
-		if(strlen(lastupdate) == 0) {
-			_alpm_log(PM_LOG_DEBUG, "failed to get lastupdate time for %s (no big deal)\n", db->treename);
+		lastupdate = _alpm_db_getlastupdate(db);
+		if(lastupdate == 0) {
+			_alpm_log(PM_LOG_DEBUG, "failed to get lastupdate time for %s\n",
+					db->treename);
 		}
 	}
 
@@ -258,7 +260,7 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
 	dbpath = alpm_option_get_dbpath();
 
 	ret = _alpm_downloadfiles_forreal(db->servers, dbpath, files, lastupdate,
-			newmtime, NULL, 0);
+			&newmtime, NULL, 0);
 	FREELIST(files);
 	if(ret == 1) {
 		/* mtimes match, do nothing */
@@ -271,9 +273,9 @@ int SYMEXPORT alpm_db_update(int force, pmdb_t *db)
 				downloadLastErrString, downloadLastErrCode);
 		RET_ERR(PM_ERR_DB_SYNC, -1);
 	} else {
-		if(strlen(newmtime)) {
-			_alpm_log(PM_LOG_DEBUG, "sync: new mtime for %s: %s\n",
-					db->treename, newmtime);
+		if(newmtime != 0) {
+			_alpm_log(PM_LOG_DEBUG, "sync: new mtime for %s: %ju\n",
+					db->treename, (uintmax_t)newmtime);
 			_alpm_db_setlastupdate(db, newmtime);
 		}
 		snprintf(path, PATH_MAX, "%s%s" DBEXT, dbpath, db->treename);

lib/libalpm/db.h

@@ -25,6 +25,7 @@
 
 #include "alpm.h"
 #include <limits.h>
+#include <time.h>
 
 /* Database entries */
 typedef enum _pmdbinfrq_t {
@@ -65,8 +66,8 @@ pmpkg_t *_alpm_db_scan(pmdb_t *db, const char *target);
 int _alpm_db_read(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq);
 int _alpm_db_write(pmdb_t *db, pmpkg_t *info, pmdbinfrq_t inforeq);
 int _alpm_db_remove(pmdb_t *db, pmpkg_t *info);
-int _alpm_db_getlastupdate(const pmdb_t *db, char *ts);
-int _alpm_db_setlastupdate(const pmdb_t *db, char *ts);
+time_t _alpm_db_getlastupdate(const pmdb_t *db);
+int _alpm_db_setlastupdate(const pmdb_t *db, time_t time);
 
 #endif /* _ALPM_DB_H */
 

lib/libalpm/server.c

@@ -144,18 +144,17 @@ static struct url *url_for_file(pmserver_t *server, const char *filename)
 int _alpm_downloadfiles(alpm_list_t *servers, const char *localpath,
 		alpm_list_t *files, int *dl_total, unsigned long totalsize)
 {
-	return(_alpm_downloadfiles_forreal(servers, localpath, files, NULL, NULL,
+	return(_alpm_downloadfiles_forreal(servers, localpath, files, 0, NULL,
 				dl_total, totalsize));
 }
 
 /*
  * This is the real downloadfiles, used directly by sync_synctree() to check
  * modtimes on remote files.
- *   - if *mtime1 is non-NULL, then only download files
- *     if they are different than *mtime1.  String should be in the form
- *     "YYYYMMDDHHMMSS" to match the form of ftplib's FtpModDate() function.
- *   - if *mtime2 is non-NULL, then it will be filled with the mtime
- *     of the remote file (from MDTM FTP cmd or Last-Modified HTTP header).
+ *   - if mtime1 is non-NULL, then only download files if they are different
+ *     than mtime1.
+ *   - if *mtime2 is non-NULL, it will be filled with the mtime of the remote
+ *     file.
  *   - if *dl_total is non-NULL, then it will be used as the starting
  *     download amount when TotalDownload is set. It will also be
  *     set to the final download amount for the calling function to use.
@@ -167,7 +166,7 @@ int _alpm_downloadfiles(alpm_list_t *servers, const char *localpath,
  *         -1 on error
  */
 int _alpm_downloadfiles_forreal(alpm_list_t *servers, const char *localpath,
-	alpm_list_t *files, const char *mtime1, char *mtime2, int *dl_total,
+	alpm_list_t *files, time_t mtime1, time_t *mtime2, int *dl_total,
 	unsigned long totalsize)
 {
 	int dl_thisfile = 0;
@@ -229,7 +228,8 @@ int _alpm_downloadfiles_forreal(alpm_list_t *servers, const char *localpath,
 					dl_thisfile = 0;
 				}
 				
-				/* libdownload does not reset the error code, reset it in the case of previous errors */
+				/* libdownload does not reset the error code, reset it in
+				 * the case of previous errors */
 				downloadLastErrCode = 0;
 
 				/* 10s timeout - TODO make a config option */
@@ -250,25 +250,21 @@ int _alpm_downloadfiles_forreal(alpm_list_t *servers, const char *localpath,
 						_alpm_log(PM_LOG_DEBUG, "connected to %s successfully\n", fileurl->host);
 				}
 				
-				if(ust.mtime && mtime1) {
-					char strtime[15];
-					_alpm_time2string(ust.mtime, strtime);
-					if(strcmp(mtime1, strtime) == 0) {
-						_alpm_log(PM_LOG_DEBUG, "mtimes are identical, skipping %s\n", fn);
-						complete = alpm_list_add(complete, fn);
-						if(localf != NULL) {
-							fclose(localf);
-						}
-						if(dlf != NULL) {
-							fclose(dlf);
-						}
-						downloadFreeURL(fileurl);
-						return(1);
+				if(ust.mtime && mtime1 && ust.mtime == mtime1) {
+					_alpm_log(PM_LOG_DEBUG, "mtimes are identical, skipping %s\n", fn);
+					complete = alpm_list_add(complete, fn);
+					if(localf != NULL) {
+						fclose(localf);
 					}
+					if(dlf != NULL) {
+						fclose(dlf);
+					}
+					downloadFreeURL(fileurl);
+					return(1);
 				}
 				
 				if(ust.mtime && mtime2) {
-					_alpm_time2string(ust.mtime, mtime2);
+					*mtime2 = ust.mtime;
 				}
 
 				if(chk_resume && fileurl->offset == 0) {

lib/libalpm/server.h

@@ -40,8 +40,8 @@ void _alpm_server_free(pmserver_t *server);
 int _alpm_downloadfiles(alpm_list_t *servers, const char *localpath,
 		alpm_list_t *files, int *dl_total, unsigned long totalsize);
 int _alpm_downloadfiles_forreal(alpm_list_t *servers, const char *localpath,
-	alpm_list_t *files, const char *mtime1, char *mtime2,
-	int *dl_total, unsigned long totalsize);
+	alpm_list_t *files, time_t mtime1, time_t *mtime2, int *dl_total,
+	unsigned long totalsize);
 
 #endif /* _ALPM_SERVER_H */
 

lib/libalpm/util.c

@@ -509,20 +509,6 @@ int _alpm_ldconfig(const char *root)
 	return(0);
 }
 
-/* convert a time_t to a string - buffer MUST be large enough for
- * YYYYMMDDHHMMSS - 15 chars */
-void _alpm_time2string(time_t t, char *buffer)
-{
-	if(buffer) {
-		struct tm *lt;
-		lt = localtime(&t);
-		sprintf(buffer, "%4d%02d%02d%02d%02d%02d",
-						lt->tm_year+1900, lt->tm_mon+1, lt->tm_mday,
-						lt->tm_hour, lt->tm_min, lt->tm_sec);
-		buffer[14] = '\0';
-	}
-}
-
 /* Helper function for comparing strings using the
  * alpm "compare func" signature */
 int _alpm_str_cmp(const void *s1, const void *s2)

lib/libalpm/util.h

@@ -61,7 +61,6 @@ int _alpm_unpack(const char *archive, const char *prefix, const char *fn);
 int _alpm_rmrf(const char *path);
 int _alpm_logaction(unsigned short usesyslog, FILE *f, const char *fmt, va_list args);
 int _alpm_ldconfig(const char *root);
-void _alpm_time2string(time_t t, char *buffer);
 int _alpm_str_cmp(const void *s1, const void *s2);
 char *_alpm_filecache_find(const char *filename);
 const char *_alpm_filecache_setup(void);