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Commit6f6943f

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Improve error message for missing extension.
If we get ENOENT while trying to read an extension control file,report that as a missing extension (with a HINT to install it)rather than as a filesystem access problem. The message wordingwas extensively bikeshedded in hopes of pointing people to theidea that they need to do a software installation before theycan install the extension into the current database.Nathan Bossart, with review/wording suggestions from DanielGustafsson, Chapman Flack, and myselfDiscussion:https://postgr.es/m/3950D56A-4E47-48E7-BF9B-F5F22E268BE7@amazon.com
1 parent98e93a1 commit6f6943f

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‎src/backend/commands/extension.c

Lines changed: 15 additions & 4 deletions
Original file line numberDiff line numberDiff line change
@@ -487,11 +487,22 @@ parse_extension_control_file(ExtensionControlFile *control,
487487

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if ((file=AllocateFile(filename,"r"))==NULL)
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{
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if (version&&errno==ENOENT)
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if (errno==ENOENT)
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{
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/* no auxiliary file for this version */
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pfree(filename);
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return;
492+
/* no complaint for missing auxiliary file */
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if (version)
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{
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pfree(filename);
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return;
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}
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499+
/* missing control file indicates extension is not installed */
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ereport(ERROR,
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(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
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errmsg("extension \"%s\" is not available",control->name),
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errdetail("Could not open extension control file \"%s\": %m.",
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filename),
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errhint("The extension must first be installed on the system where PostgreSQL is running.")));
495506
}
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ereport(ERROR,
497508
(errcode_for_file_access(),

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