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cgit_open_filter: hand down repo configuration to script

Telusuri Sumber 
The environment variables can be used to (for example) resolve
the following situation:

Suppose a server setup in which each repository has a trac
instance; the commit filter needs to know with which
repository it's dealing in order to be able to resolve the
#123 ticket numbers in the commit messages into hyperlinks
into the correct trac instance.

Signed-off-by: Ferry Huberts <ferry.huberts@pelagic.nl>
Signed-off-by: Lars Hjemli <hjemli@gmail.com>
This commit is contained in:
Ferry Huberts 2011-03-23 11:57:43 +01:00 committed by Lars Hjemli
orang tua d87bba846d
melakukan 14f28923a2
1 mengubah file dengan 77 tambahan dan 1 penghapusan
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78
shared.c
Melihat File

@ -7,6 +7,8 @@
*/
#include "cgit.h"
#include <stdio.h>
#include <linux/limits.h>
struct cgit_repolist cgit_repolist;
struct cgit_context ctx;
@ -376,6 +378,70 @@ int cgit_parse_snapshots_mask(const char *str)
return rv;
}
typedef struct {
char * name;
char * value;
} cgit_env_var;
static char * prepare_env(struct cgit_repo * repo) {
cgit_env_var env_vars[] = {
{ .name = "CGIT_REPO_URL", .value = repo->url },
{ .name = "CGIT_REPO_NAME", .value = repo->name },
{ .name = "CGIT_REPO_PATH", .value = repo->path },
{ .name = "CGIT_REPO_OWNER", .value = repo->owner },
{ .name = "CGIT_REPO_DEFBRANCH", .value = repo->defbranch },
{ .name = "CGIT_REPO_SECTION", .value = repo->section },
{ .name = "CGIT_REPO_CLONE_URL", .value = repo->clone_url }
};
int env_var_count = ARRAY_SIZE(env_vars);
long values_space = (env_var_count * (PATH_MAX + 64));
void * buffer;
char ** vars;
char * values;
int vars_index = 0;
unsigned int chars_printed;
/* Allocate buffer for environment variables: first in the buffer is an
* array of pointers to argument strings, terminated with a NULL pointer.
* After that the argument strings are placed after each other */
buffer = malloc(((env_var_count + 1) * sizeof(char *)) + values_space);
if (!buffer)
return NULL;
vars = buffer;
values = (char *) &vars[env_var_count + 1];
/* loop over all defined environment variables and their values */
while (vars_index < env_var_count) {
char * name = env_vars[vars_index].name;
char * value = env_vars[vars_index].value;
if (!value)
value = "";
chars_printed = snprintf(values, (values_space - 1), "%s=%s", name,
value);
if (chars_printed > (values_space - 1)) {
/* Buffer space exhausted: stop adding variables.
* Not all environment variables are defined, but the best we can
* do is to provide the ones that _are_ defined */
break;
}
values[chars_printed] = '\0';
*&vars[vars_index] = values;
values += (chars_printed + 1);
values_space -= (chars_printed + 1);
vars_index++;
}
/* terminate the array with pointers */
*&vars[vars_index] = NULL;
return (char *) buffer;
}
int cgit_open_filter(struct cgit_filter *filter, struct cgit_repo * repo)
{
@ -384,10 +450,20 @@ int cgit_open_filter(struct cgit_filter *filter, struct cgit_repo * repo)
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) {
char * env = NULL;
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);
if (repo)
env = prepare_env(repo);
execve(filter->cmd, filter->argv, (char **)env);
if (env)
free(env);
die("Unable to exec subprocess %s: %s (%d)", filter->cmd,
strerror(errno), errno);
}