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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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15
src/bin/psql/command.c
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@ -5041,6 +5041,21 @@ do_shell(const char *command)
else
result = system(command);
if (result == 0)
{
SetVariable(pset.vars, "SHELL_EXIT_CODE", "0");
SetVariable(pset.vars, "SHELL_ERROR", "false");
}
else
{
int exit_code = wait_result_to_exit_code(result);
char buf[32];
snprintf(buf, sizeof(buf), "%d", exit_code);
SetVariable(pset.vars, "SHELL_EXIT_CODE", buf);
SetVariable(pset.vars, "SHELL_ERROR", "true");
}
if (result == 127 || result == -1)
{
pg_log_error("\\!: failed");