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This patch makes it possible to serve static content from Nix store paths, by
using the hash of the store path for the ETag header.
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index cb49ef74..7b456993 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -1583,6 +1583,8 @@ ngx_http_set_etag(ngx_http_request_t *r)
{
ngx_table_elt_t *etag;
ngx_http_core_loc_conf_t *clcf;
+ u_char *real, *ptr1, *ptr2;
+ ngx_err_t err;
clcf = ngx_http_get_module_loc_conf(r, ngx_http_core_module);
@@ -1598,16 +1600,60 @@ ngx_http_set_etag(ngx_http_request_t *r)
etag->hash = 1;
ngx_str_set(&etag->key, "ETag");
- etag->value.data = ngx_pnalloc(r->pool, NGX_OFF_T_LEN + NGX_TIME_T_LEN + 3);
- if (etag->value.data == NULL) {
- etag->hash = 0;
- return NGX_ERROR;
+ err = ngx_errno;
+ real = ngx_realpath(clcf->root.data, NULL);
+ ngx_set_errno(err);
+
+ #define NIX_STORE_DIR "@nixStoreDir@"
+ #define NIX_STORE_LEN @nixStoreDirLen@
+
+ if (r->headers_out.last_modified_time == 1
+ && real != NULL
+ && !ngx_strncmp(real, NIX_STORE_DIR, NIX_STORE_LEN)
+ && real[NIX_STORE_LEN] == '/'
+ && real[NIX_STORE_LEN + 1] != '\0')
+ {
+ ptr1 = real + NIX_STORE_LEN;
+ *ptr1 = '"';
+
+ ptr2 = (u_char *) ngx_strchr(ptr1, '-');
+
+ if (ptr2 == NULL) {
+ ngx_free(real);
+ etag->hash = 0;
+ return NGX_ERROR;
+ }
+
+ *ptr2++ = '"';
+ *ptr2 = '\0';
+
+ etag->value.len = ngx_strlen(ptr1);
+ etag->value.data = ngx_pnalloc(r->pool, etag->value.len);
+
+ if (etag->value.data == NULL) {
+ ngx_free(real);
+ etag->hash = 0;
+ return NGX_ERROR;
+ }
+
+ ngx_memcpy(etag->value.data, ptr1, etag->value.len);
+ ngx_http_clear_last_modified(r);
+ } else {
+ etag->value.data = ngx_pnalloc(r->pool, NGX_OFF_T_LEN + NGX_TIME_T_LEN + 3);
+
+ if (etag->value.data == NULL) {
+ ngx_free(real);
+ etag->hash = 0;
+ return NGX_ERROR;
+ }
+
+ etag->value.len = ngx_sprintf(etag->value.data, "\"%xT-%xO\"",
+ r->headers_out.last_modified_time,
+ r->headers_out.content_length_n)
+ - etag->value.data;
}
- etag->value.len = ngx_sprintf(etag->value.data, "\"%xT-%xO\"",
- r->headers_out.last_modified_time,
- r->headers_out.content_length_n)
- - etag->value.data;
+ ngx_free(real);
r->headers_out.etag = etag;
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