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authorJason A. Donenfeld <Jason@zx2c4.com>2014-01-14 18:07:23 +0100
committerJason A. Donenfeld <Jason@zx2c4.com>2014-01-14 18:09:52 +0100
commit6ca734da8fb246ad2272826331e0d56428b96fa1 (patch)
tree01abfea3df45135b1114996de29093b6eed7023a
parentce56d89a2662549acd178292450798f5ffcd4bc6 (diff)
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filter: allow returning exit code from filter
Filters can now indicate a status back to cgit by means of the exit code for exec, or the return value from close for Lua. Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
-rw-r--r--cgitrc.5.txt3
-rw-r--r--filter.c14
-rw-r--r--filters/email-gravatar.lua1
3 files changed, 12 insertions, 6 deletions
diff --git a/cgitrc.5.txt b/cgitrc.5.txt
index d8f7d0e..170e825 100644
--- a/cgitrc.5.txt
+++ b/cgitrc.5.txt
@@ -590,7 +590,8 @@ specification with the relevant string; available values are:
This is called whenever cgit writes data to the webpage.
'filter_close()'::
This is called when the current filtering operation is
- completed.
+ completed. It must return an integer value. Usually 0
+ indicates success.
Additionally, cgit exposes to the Lua the following built-in functions:
diff --git a/filter.c b/filter.c
index 4d4acaf..0cce7bb 100644
--- a/filter.c
+++ b/filter.c
@@ -106,7 +106,7 @@ static int open_exec_filter(struct cgit_filter *base, va_list ap)
static int close_exec_filter(struct cgit_filter *base)
{
struct cgit_exec_filter *filter = (struct cgit_exec_filter *)base;
- int i, exit_status;
+ int i, exit_status = 0;
chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
"Unable to restore STDOUT");
@@ -114,14 +114,14 @@ static int close_exec_filter(struct cgit_filter *base)
if (filter->pid < 0)
goto done;
waitpid(filter->pid, &exit_status, 0);
- if (WIFEXITED(exit_status) && !WEXITSTATUS(exit_status))
+ if (WIFEXITED(exit_status))
goto done;
die("Subprocess %s exited abnormally", filter->cmd);
done:
for (i = 0; i < filter->base.argument_count; i++)
filter->argv[i + 1] = NULL;
- return 0;
+ return WEXITSTATUS(exit_status);
}
@@ -315,10 +315,14 @@ static int close_lua_filter(struct cgit_filter *base)
int ret = 0;
lua_getglobal(filter->lua_state, "filter_close");
- if (lua_pcall(filter->lua_state, 0, 0, 0)) {
+ if (lua_pcall(filter->lua_state, 0, 1, 0)) {
error_lua_filter(filter);
- ret = 1;
+ ret = -1;
+ } else {
+ ret = lua_tonumber(filter->lua_state, -1);
+ lua_pop(filter->lua_state, 1);
}
+
unhook_write();
return ret;
}
diff --git a/filters/email-gravatar.lua b/filters/email-gravatar.lua
index 22f0641..c80b63e 100644
--- a/filters/email-gravatar.lua
+++ b/filters/email-gravatar.lua
@@ -16,6 +16,7 @@ end
function filter_close()
html("<img src='//www.gravatar.com/avatar/" .. md5 .. "?s=13&amp;d=retro' style='height:10pt;width:10pt' alt='Gravatar' /> " .. buffer)
+ return 0
end
function filter_write(str)