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* [PATCH v1 1/1] attempt multibyte-aware truncation of database names
@ 2024-11-20 22:30 Nathan Bossart <nathan@postgresql.org>
0 siblings, 0 replies; 1+ messages in thread
From: Nathan Bossart @ 2024-11-20 22:30 UTC (permalink / raw)
---
src/backend/utils/init/postinit.c | 46 +++++++++++++++++++++++++++++--
1 file changed, 43 insertions(+), 3 deletions(-)
inline patch 1: src/backend/utils/init/postinit.c (+43/-3 lines) download inline-1.patch
diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c
index 5b657a3f13..c64e8ac849 100644
--- a/src/backend/utils/init/postinit.c
+++ b/src/backend/utils/init/postinit.c
@@ -1003,14 +1003,54 @@ InitPostgres(const char *in_dbname, Oid dboid,
{
HeapTuple tuple;
Form_pg_database dbform;
+ char trunc_dbname[NAMEDATALEN];
+
+ strncpy(trunc_dbname, in_dbname, NAMEDATALEN - 1);
+ trunc_dbname[NAMEDATALEN - 1] = '\0';
+
+ tuple = GetDatabaseTuple(trunc_dbname);
+ if (HeapTupleIsValid(tuple))
+ strcpy(dbname, trunc_dbname);
+
+ if (strlen(in_dbname) >= NAMEDATALEN &&
+ IS_HIGHBIT_SET(in_dbname[NAMEDATALEN - 1]) &&
+ IS_HIGHBIT_SET(in_dbname[NAMEDATALEN - 2]))
+ {
+ for (int i = 1; i < MAX_MULTIBYTE_CHAR_LEN - 1; i++)
+ {
+ HeapTuple tmp;
+
+ trunc_dbname[NAMEDATALEN - 1 - i] = '\0';
+ tmp = GetDatabaseTuple(trunc_dbname);
+ if (HeapTupleIsValid(tmp))
+ {
+ if (HeapTupleIsValid(tuple))
+ ereport(FATAL,
+ (errmsg("ambiguous database name")));
+ tuple = tmp;
+ strcpy(dbname, trunc_dbname);
+ }
+
+ if (!IS_HIGHBIT_SET(dbname[NAMEDATALEN - 2 - i]))
+ break;
+ }
+ }
- tuple = GetDatabaseTuple(in_dbname);
if (!HeapTupleIsValid(tuple))
ereport(FATAL,
(errcode(ERRCODE_UNDEFINED_DATABASE),
errmsg("database \"%s\" does not exist", in_dbname)));
dbform = (Form_pg_database) GETSTRUCT(tuple);
dboid = dbform->oid;
+
+ if (MyProcPort && MyProcPort->database_name &&
+ strcmp(MyProcPort->database_name, dbname) != 0)
+ {
+ pfree(MyProcPort->database_name);
+ MyProcPort->database_name = pstrdup(dbname);
+
+ /* XXX: should we fix process title? */
+ }
}
else if (!OidIsValid(dboid))
{
@@ -1067,12 +1107,12 @@ InitPostgres(const char *in_dbname, Oid dboid,
datform = (Form_pg_database) GETSTRUCT(tuple);
if (!HeapTupleIsValid(tuple) ||
- (in_dbname && namestrcmp(&datform->datname, in_dbname)))
+ (in_dbname && namestrcmp(&datform->datname, dbname)))
{
if (in_dbname)
ereport(FATAL,
(errcode(ERRCODE_UNDEFINED_DATABASE),
- errmsg("database \"%s\" does not exist", in_dbname),
+ errmsg("database \"%s\" does not exist", dbname),
errdetail("It seems to have just been dropped or renamed.")));
else
ereport(FATAL,
--
2.39.5 (Apple Git-154)
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2024-11-20 22:30 [PATCH v1 1/1] attempt multibyte-aware truncation of database names Nathan Bossart <nathan@postgresql.org>
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