[pacman-dev] [PATCH] trans.c: create transaction prior to checking DB version
The addition of the DB version check introduces a lag time between the lockfile creation and the transaction initialization. In cases where the local DB is large enough and/or the user's disk is slow enough, this time is significant enough that its possible for a user to send a SIGINT and leave behind a db.lck file. Signed-off-by: Dave Reisner <d@falconindy.com> --- lib/libalpm/trans.c | 19 ++++++++++--------- 1 files changed, 10 insertions(+), 9 deletions(-) diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c index 4e88668..af1bcce 100644 --- a/lib/libalpm/trans.c +++ b/lib/libalpm/trans.c @@ -116,15 +116,6 @@ int SYMEXPORT alpm_trans_init(pmtransflag_t flags, } } - /* check database version */ - db_version = _alpm_db_version(handle->db_local); - if(db_version < required_db_version) { - _alpm_log(PM_LOG_ERROR, - _("%s database version is too old\n"), handle->db_local->treename); - remove_lock(handle); - RET_ERR(PM_ERR_DB_VERSION, -1); - } - trans = _alpm_trans_new(); if(trans == NULL) { RET_ERR(PM_ERR_MEMORY, -1); @@ -138,6 +129,16 @@ int SYMEXPORT alpm_trans_init(pmtransflag_t flags, handle->trans = trans; + /* check database version */ + db_version = _alpm_db_version(handle->db_local); + if(db_version < required_db_version) { + _alpm_log(PM_LOG_ERROR, + _("%s database version is too old\n"), handle->db_local->treename); + remove_lock(handle); + _alpm_trans_free(trans); + RET_ERR(PM_ERR_DB_VERSION, -1); + } + return 0; } -- 1.7.5.1
On Sat, May 14, 2011 at 11:54 AM, Dave Reisner <d@falconindy.com> wrote:
The addition of the DB version check introduces a lag time between the lockfile creation and the transaction initialization. In cases where the local DB is large enough and/or the user's disk is slow enough, this time is significant enough that its possible for a user to send a SIGINT and leave behind a db.lck file.
Seems OK to me...this code is full of dragons anyway.
Signed-off-by: Dave Reisner <d@falconindy.com> --- lib/libalpm/trans.c | 19 ++++++++++--------- 1 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/lib/libalpm/trans.c b/lib/libalpm/trans.c index 4e88668..af1bcce 100644 --- a/lib/libalpm/trans.c +++ b/lib/libalpm/trans.c @@ -116,15 +116,6 @@ int SYMEXPORT alpm_trans_init(pmtransflag_t flags, } }
- /* check database version */ - db_version = _alpm_db_version(handle->db_local); - if(db_version < required_db_version) { - _alpm_log(PM_LOG_ERROR, - _("%s database version is too old\n"), handle->db_local->treename); - remove_lock(handle); - RET_ERR(PM_ERR_DB_VERSION, -1); - } - trans = _alpm_trans_new(); if(trans == NULL) { RET_ERR(PM_ERR_MEMORY, -1); @@ -138,6 +129,16 @@ int SYMEXPORT alpm_trans_init(pmtransflag_t flags,
handle->trans = trans;
+ /* check database version */ + db_version = _alpm_db_version(handle->db_local); + if(db_version < required_db_version) { + _alpm_log(PM_LOG_ERROR, + _("%s database version is too old\n"), handle->db_local->treename); + remove_lock(handle); + _alpm_trans_free(trans); + RET_ERR(PM_ERR_DB_VERSION, -1); + } + return 0; }
-- 1.7.5.1
participants (2)
-
Dan McGee
-
Dave Reisner