File suspendlock.diff of Package rpm.26687

Overview Repositories Revisions Requests Users Attributes Meta

File suspendlock.diff of Package rpm.26687

Suspend exclusive database lock when scriptlets get called, allowing
read access in scriptlets. Only needed for DB_PRIVATE (aka global)
locking.

--- ./lib/backend/db3.c.orig	2017-12-01 14:27:03.193486711 +0000
+++ ./lib/backend/db3.c	2017-12-01 14:27:23.747426200 +0000
@@ -552,6 +552,46 @@ static void db3_dbSetFSync(rpmdb rdb, in
 
 static int db3_Ctrl(rpmdb rdb, dbCtrlOp ctrl)
 {
+    struct flock l;
+    int tries;
+    int fdno = -1;
+    dbiIndex dbi;
+    DB * db;
+
+    switch (ctrl) {
+    case DB_CTRL_SUSPEND_DBLOCK:
+    case DB_CTRL_RESUME_DBLOCK:
+	dbi = rdb->db_pkgs;	/* packages db only */
+	if (!dbi)
+	    return 1;
+	if (!dbi->cfg.dbi_lockdbfd || (dbi->dbi_flags & DBI_VERIFYONLY) != 0)
+	    return 0;
+	if (!(dbi->dbi_rpmdb->db_mode & (O_RDWR|O_WRONLY)))
+	    return 0;
+	if (_lockdbfd == 0)
+	    return 0;
+        db = dbi->dbi_db;
+	if (!(db->fd(db, &fdno) == 0 && fdno >= 0))
+	    return 1;
+	for (tries = 0; tries < 2; tries++) {
+	    memset(&l, 0, sizeof(l));
+	    l.l_whence = 0;
+	    l.l_start = 0;
+	    l.l_len = 0;
+	    l.l_type = ctrl == DB_CTRL_SUSPEND_DBLOCK ? F_RDLCK : F_WRLCK;
+	    if (!fcntl(fdno, tries ? F_SETLKW : F_SETLK, (void *)&l))
+		return 0;
+	    if (ctrl == DB_CTRL_SUSPEND_DBLOCK) {
+		rpmlog(RPMLOG_WARNING, _("could not suspend database lock\n"));
+		return 1;
+	    }
+	    if (tries == 0)
+		rpmlog(RPMLOG_WARNING, _("waiting to reestablish exclusive database lock\n"));
+	}
+	return 1;
+    default:
+        break;
+    }
     return 0;
 }
 
--- ./lib/backend/dbi.h.orig	2017-12-01 14:27:03.193486711 +0000
+++ ./lib/backend/dbi.h	2017-12-01 14:27:23.747426200 +0000
@@ -17,7 +17,9 @@ typedef enum dbCtrlOp_e {
     DB_CTRL_UNLOCK_RO		= 2,
     DB_CTRL_LOCK_RW		= 3,
     DB_CTRL_UNLOCK_RW		= 4,
-    DB_CTRL_INDEXSYNC		= 5
+    DB_CTRL_INDEXSYNC		= 5,
+    DB_CTRL_SUSPEND_DBLOCK      = 100,
+    DB_CTRL_RESUME_DBLOCK       = 101
 } dbCtrlOp;
 
 typedef struct dbiIndex_s * dbiIndex;
--- ./lib/rpmdb.c.orig	2017-12-01 14:27:03.190486720 +0000
+++ ./lib/rpmdb.c	2017-12-01 14:27:23.748426197 +0000
@@ -2639,6 +2639,12 @@ int rpmdbCtrl(rpmdb db, rpmdbCtrlOp ctrl
     case RPMDB_CTRL_INDEXSYNC:
 	dbctrl = DB_CTRL_INDEXSYNC;
 	break;
+    case RPMDB_CTRL_SUSPEND_DBLOCK:
+	dbctrl = DB_CTRL_SUSPEND_DBLOCK;
+	break;
+    case RPMDB_CTRL_RESUME_DBLOCK:
+	dbctrl = DB_CTRL_RESUME_DBLOCK;
+	break;
     }
     return dbctrl ? dbCtrl(db, dbctrl) : 1;
 }
--- ./lib/rpmdb.h.orig	2017-10-05 10:04:57.035602138 +0000
+++ ./lib/rpmdb.h	2017-12-01 14:27:23.748426197 +0000
@@ -35,7 +35,9 @@ typedef enum rpmdbCtrlOp_e {
     RPMDB_CTRL_UNLOCK_RO       = 2,
     RPMDB_CTRL_LOCK_RW         = 3,
     RPMDB_CTRL_UNLOCK_RW       = 4,
-    RPMDB_CTRL_INDEXSYNC       = 5
+    RPMDB_CTRL_INDEXSYNC       = 5,
+    RPMDB_CTRL_SUSPEND_DBLOCK  = 100,
+    RPMDB_CTRL_RESUME_DBLOCK   = 101
 } rpmdbCtrlOp;
 
 /** \ingroup rpmdb
--- ./lib/transaction.c.orig	2017-12-01 14:27:23.750426192 +0000
+++ ./lib/transaction.c	2017-12-01 14:28:43.232192224 +0000
@@ -1457,6 +1457,7 @@ rpmRC runScript(rpmts ts, rpmte te, Head
 		     stag != RPMTAG_PREUN &&
 		     stag != RPMTAG_PRETRANS &&
 		     stag != RPMTAG_VERIFYSCRIPT);
+    rpmdb rdb = rpmtsGetRdb(ts);
 
     /* Fake up a transaction element for triggers from rpmdb */
     if (te == NULL) {
@@ -1468,10 +1469,12 @@ rpmRC runScript(rpmts ts, rpmte te, Head
     if (sfd == NULL)
 	sfd = rpmtsScriptFd(ts);
 
+    rpmdbCtrl(rdb, RPMDB_CTRL_SUSPEND_DBLOCK);
     rpmswEnter(rpmtsOp(ts, RPMTS_OP_SCRIPTLETS), 0);
     rc = rpmScriptRun(script, arg1, arg2, sfd,
 		      prefixes, warn_only, rpmtsPlugins(ts));
     rpmswExit(rpmtsOp(ts, RPMTS_OP_SCRIPTLETS), 0);
+    rpmdbCtrl(rdb, RPMDB_CTRL_RESUME_DBLOCK);
 
     /* Map warn-only errors to "notfound" for script stop callback */
     stoprc = (rc != RPMRC_OK && warn_only) ? RPMRC_NOTFOUND : rc;

Places

File suspendlock.diff of Package rpm.26687

Places