Change pg_restore -f- to dump to stdout instead of to ./-

Starting with PostgreSQL 12, pg_restore refuses to run when neither -d
nor -f are specified (c.f. commit 413ccaa74d9a), and it also makes "-f -"
mean the old implicit behavior of dumping to stdout.  However, older
branches write to a file called ./- when invoked like that, making it
impossible to write pg_restore scripts that work across versions.  This
is a partial backpatch of the aforementioned commit to all older
supported branches, providing an upgrade path.

Discussion: https://postgr.es/m/20191006190839.GE18030@telsasoft.com

diff --git a/doc/src/sgml/ref/pg_restore.sgml b/doc/src/sgml/ref/pg_restore.sgml
index 4bc30ce679b9c87d05c3872def83773f7b3c8416..9ed2d870ed113fc0ca15282114eaac4512eb1423 100644 (file)
--- a/doc/src/sgml/ref/pg_restore.sgml
+++ b/doc/src/sgml/ref/pg_restore.sgml
@@ -165,8 +165,8 @@
       <listitem>
        <para>
         Specify output file for generated script, or for the listing
-        when used with <option>-l</option>. Default is the standard
-        output.
+        when used with <option>-l</option>. Use <literal>-</literal>
+        for the standard output, which is also the default.
        </para>
       </listitem>
      </varlistentry>

diff --git a/src/bin/pg_dump/pg_backup_archiver.c b/src/bin/pg_dump/pg_backup_archiver.c
index f8128440e9a50b9ec855428b2b07f3a40003e920..21d9e80bc7b5fa9cc6540b4044fa0e0205872cbb 100644 (file)
--- a/src/bin/pg_dump/pg_backup_archiver.c
+++ b/src/bin/pg_dump/pg_backup_archiver.c
@@ -1405,7 +1405,12 @@ SetOutput(ArchiveHandle *AH, const char *filename, int compression)
        int                     fn;
 
        if (filename)
-               fn = -1;
+       {
+               if (strcmp(filename, "-") == 0)
+                       fn = fileno(stdout);
+               else
+                       fn = -1;
+       }
        else if (AH->FH)
                fn = fileno(AH->FH);
        else if (AH->fSpec)

diff --git a/src/bin/pg_dump/pg_restore.c b/src/bin/pg_dump/pg_restore.c
index 077abc0fc3fe61ad33d87f1302169e2468b3cc43..c9e25f6f2bd5e59d099bceed1a6aebac8f658214 100644 (file)
--- a/src/bin/pg_dump/pg_restore.c
+++ b/src/bin/pg_dump/pg_restore.c
@@ -440,7 +440,7 @@ usage(const char *progname)
 
        printf(_("\nGeneral options:\n"));
        printf(_("  -d, --dbname=NAME        connect to database name\n"));
-       printf(_("  -f, --file=FILENAME      output file name\n"));
+       printf(_("  -f, --file=FILENAME      output file name (- for stdout)\n"));
        printf(_("  -F, --format=c|d|t       backup file format (should be automatic)\n"));
        printf(_("  -l, --list               print summarized TOC of the archive\n"));
        printf(_("  -v, --verbose            verbose mode\n"));