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authorLars Hjemli <hjemli@gmail.com>2009-07-31 15:38:38 +0000
committerLars Hjemli <hjemli@gmail.com>2009-07-31 15:39:51 +0000
commitd6f6072560c963065b13c704fa1fa6f8950e4bac (patch)
tree096a542cd404d4a174f2f4a1da44ab0df99aa7c3
parent286a905842dc0bec6d21a614ec4a97c5f19d5bc4 (diff)
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Add generic filter/plugin infrastructure
The functions cgit_open_filter() and cgit_close_filter() can be used to execute filters on the output stream from cgit. Signed-off-by: Lars Hjemli <hjemli@gmail.com>
-rw-r--r--cgit.c15
-rw-r--r--cgit.h12
-rw-r--r--shared.c35
3 files changed, 62 insertions, 0 deletions
diff --git a/cgit.c b/cgit.c
index 2039ab1..779a464 100644
--- a/cgit.c
+++ b/cgit.c
@@ -17,6 +17,21 @@
const char *cgit_version = CGIT_VERSION;
+struct cgit_filter *new_filter(const char *cmd, int extra_args)
+{
+ struct cgit_filter *f;
+
+ if (!cmd)
+ return NULL;
+
+ f = xmalloc(sizeof(struct cgit_filter));
+ f->cmd = xstrdup(cmd);
+ f->argv = xmalloc((2 + extra_args) * sizeof(char *));
+ f->argv[0] = f->cmd;
+ f->argv[1] = NULL;
+ return f;
+}
+
void config_cb(const char *name, const char *value)
{
if (!strcmp(name, "root-title"))
diff --git a/cgit.h b/cgit.h
index 8c64efe..d0fff1f 100644
--- a/cgit.h
+++ b/cgit.h
@@ -129,6 +129,15 @@ struct cgit_query {
int showmsg;
};
+struct cgit_filter {
+ char *cmd;
+ char **argv;
+ int old_stdout;
+ int pipe_fh[2];
+ int pid;
+ int exitstatus;
+};
+
struct cgit_config {
char *agefile;
char *cache_root;
@@ -248,5 +257,8 @@ extern const char *cgit_repobasename(const char *reponame);
extern int cgit_parse_snapshots_mask(const char *str);
+extern int cgit_open_filter(struct cgit_filter *filter);
+extern int cgit_close_filter(struct cgit_filter *filter);
+
#endif /* CGIT_H */
diff --git a/shared.c b/shared.c
index cce0af4..288cfa2 100644
--- a/shared.c
+++ b/shared.c
@@ -355,3 +355,38 @@ int cgit_parse_snapshots_mask(const char *str)
}
return rv;
}
+
+int cgit_open_filter(struct cgit_filter *filter)
+{
+
+ filter->old_stdout = chk_positive(dup(STDOUT_FILENO),
+ "Unable to duplicate STDOUT");
+ chk_zero(pipe(filter->pipe_fh), "Unable to create pipe to subprocess");
+ filter->pid = chk_non_negative(fork(), "Unable to create subprocess");
+ if (filter->pid == 0) {
+ close(filter->pipe_fh[1]);
+ chk_non_negative(dup2(filter->pipe_fh[0], STDIN_FILENO),
+ "Unable to use pipe as STDIN");
+ execvp(filter->cmd, filter->argv);
+ die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
+ strerror(errno), errno);
+ }
+ close(filter->pipe_fh[0]);
+ chk_non_negative(dup2(filter->pipe_fh[1], STDOUT_FILENO),
+ "Unable to use pipe as STDOUT");
+ close(filter->pipe_fh[1]);
+ return 0;
+}
+
+int cgit_close_filter(struct cgit_filter *filter)
+{
+ chk_non_negative(dup2(filter->old_stdout, STDOUT_FILENO),
+ "Unable to restore STDOUT");
+ close(filter->old_stdout);
+ if (filter->pid < 0)
+ return 0;
+ waitpid(filter->pid, &filter->exitstatus, 0);
+ if (WIFEXITED(filter->exitstatus) && !WEXITSTATUS(filter->exitstatus))
+ return 0;
+ die("Subprocess %s exited abnormally", filter->cmd);
+}