+File: gpgme.info, Node: Checking for updates, Prev: Using the Assuan protocol, Up: Miscellaneous
+
+7.8.3 How to check for software updates
+---------------------------------------
+
+The GnuPG Project operates a server to query the current versions of
+software packages related to GnuPG. GPGME can be used to access this
+online database and check whether a new version of a software package is
+available.
+
+ -- Data type: gpgme_query_swdb_result_t
+ This is a pointer to a structure used to store the result of a
+ ‘gpgme_op_query_swdb’ operation. After success full call to that
+ function, you can retrieve the pointer to the result with
+ ‘gpgme_op_query_swdb_result’. The structure contains the following
+ member:
+
+ ‘name’
+ This is the name of the package.
+
+ ‘iversion’
+ The currently installed version or an empty string. This
+ value is either a copy of the argument given to
+ ‘gpgme_op_query_swdb’ or the version of the installed software
+ as figured out by GPGME or GnuPG.
+
+ ‘created’
+ This gives the date the file with the list of version numbers
+ has originally be created by the GnuPG project.
+
+ ‘retrieved’
+ This gives the date the file was downloaded.
+
+ ‘warning’
+ If this flag is set either an error has occurred or some of
+ the information in this structure are not properly set. For
+ example if the version number of the installed software could
+ not be figured out, the ‘update’ flag may not reflect a
+ required update status.
+
+ ‘update’
+ If this flag is set an update of the software is available.
+
+ ‘urgent’
+ If this flag is set an available update is important.
+
+ ‘noinfo’
+ If this flag is set, no valid information could be retrieved.
+
+ ‘unknown’
+ If this flag is set the given ‘name’ is not known.
+
+ ‘tooold’
+ If this flag is set the available information is not fresh
+ enough.
+
+ ‘error’
+ If this flag is set some other error has occured.
+
+ ‘version’
+ The version string of the latest released version.
+
+ ‘reldate’
+ The release date of the latest released version.
+
+ -- Function: gpgme_error_t gpgme_op_query_swdb (gpgme_ctx_t CTX,
+ const char *NAME, const char *IVERSION, gpgme_data_t RESERVED)
+
+ Query the software version database for software package NAME and
+ check against the installed version given by IVERSION. If IVERSION
+ is given as ‘NULL’ a check is only done if GPGME can figure out the
+ version by itself (for example when using "gpgme" or "gnupg"). If
+ ‘NULL’ is used for NAME the current gpgme version is checked.
+ RESERVED must be set to 0.
+
+ -- Function: gpgme_query_swdb_result_t gpgme_op_query_swdb_result
+ (gpgme_ctx_t CTX)
+
+ The function ‘gpgme_op_query_swdb_result’ returns a
+ ‘gpgme_query_swdb_result_t’ pointer to a structure holding the
+ result of a ‘gpgme_op_query_swdb’ operation. The pointer is only
+ valid if the last operation on the context was a sucessful call to
+ ‘gpgme_op_query_swdb’. If that call failed, the result might be a
+ ‘NULL’ pointer. The returned pointer is only valid until the next
+ operation is started on the context CTX.
+
+Here is an example on how to check whether GnuPG is current:
+
+ #include <gpgme.h>
+
+ int
+ main (void)
+ {
+ gpg_error_t err;
+ gpgme_ctx_t ctx;
+ gpgme_query_swdb_result_t result;
+
+ gpgme_check_version (NULL);
+ err = gpgme_new (&ctx);
+ if (err)
+ fprintf (stderr, "error creating context: %s\n", gpg_strerror (err));
+ else
+ {
+ gpgme_set_protocol (ctx, GPGME_PROTOCOL_GPGCONF);
+
+ err = gpgme_op_query_swdb (ctx, "gnupg", NULL, 0);
+ if (err)
+ fprintf (stderr, "error querying swdb: %s\n", gpg_strerror (err));
+ else
+ {
+ result = gpgme_op_query_swdb_result (ctx);
+ if (!result)
+ fprintf (stderr, "error querying swdb\n");
+ if (!result->warning && !result->update)
+ printf ("GnuPG version %s is current\n",
+ result->iversion);
+ else if (!result->warning && result->update)
+ printf ("GnuPG version %s can be updated to %s\n",
+ result->iversion, result->version);
+ else
+ fprintf (stderr, "error finding the update status\n");
+ }
+ gpgme_release (ctx);
+ }
+ return 0;
+ }
+
+\1f
projects / platform / upstream / gpgme.git / blobdiff