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Add SHELL_ERROR and SHELL_EXIT_CODE magic variables to psql.

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These are set after a \! command or a backtick substitution.
SHELL_ERROR is just "true" for error (nonzero exit status) or "false"
for success, while SHELL_EXIT_CODE records the actual exit status
following standard shell/system(3) conventions.

Corey Huinker, reviewed by Maxim Orlov and myself

Discussion: https://postgr.es/m/CADkLM=cWao2x2f+UDw15W1JkVFr_bsxfstw=NGea7r9m4j-7rQ@mail.gmail.com
This commit is contained in:
Tom Lane
2023-03-21 13:03:42 -04:00
parent 0f85db92b9
commit b0d8f2d983
6 changed files with 88 additions and 3 deletions
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28
doc/src/sgml/ref/psql-ref.sgml
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@ -4267,6 +4267,34 @@ bar
</listitem>
</varlistentry>
<varlistentry id="app-psql-variables-shell-error">
<term><varname>SHELL_ERROR</varname></term>
<listitem>
<para>
<literal>true</literal> if the last shell command
failed, <literal>false</literal> if it succeeded.
This applies to shell commands invoked via the <literal>\!</literal>
meta-command or backquote (<literal>`</literal>) expansion.
See also <varname>SHELL_EXIT_CODE</varname>.
</para>
</listitem>
</varlistentry>
<varlistentry id="app-psql-variables-shell-exit-code">
<term><varname>SHELL_EXIT_CODE</varname></term>
<listitem>
<para>
The exit status returned by the last shell command.
0&ndash;127 represent program exit codes, 128&ndash;255
indicate termination by a signal, and -1 indicates failure
to launch a program or to collect its exit status.
This applies to shell commands invoked via the <literal>\!</literal>
meta-command or backquote (<literal>`</literal>) expansion.
See also <varname>SHELL_ERROR</varname>.
</para>
</listitem>
</varlistentry>
<varlistentry id="app-psql-variables-show-all-results">
<term><varname>SHOW_ALL_RESULTS</varname></term>
<listitem>