4 files changed, 12 insertions, 0 deletions

diff --git a/cgit.c b/cgit.c
index 19adadd..ae20257 100644
--- a/cgit.c
+++ b/cgit.c
@@ -201,16 +201,17 @@ static void prepare_context(struct cgit_context *ctx)
         ctx->cfg.summary_log = 10;
         ctx->cfg.summary_tags = 10;
         ctx->page.mimetype = "text/html";
         ctx->page.charset = PAGE_ENCODING;
         ctx->page.filename = NULL;
         ctx->page.size = 0;
         ctx->page.modified = time(NULL);
         ctx->page.expires = ctx->page.modified;
+        ctx->page.etag = NULL;
 }
 
 struct refmatch {
         char *req_ref;
         char *first_ref;
         int match;
 };
 
@@ -426,16 +427,17 @@ static int calc_ttl()
                 return ctx.cfg.cache_static_ttl;
 
         return ctx.cfg.cache_repo_ttl;
 }
 
 int main(int argc, const char **argv)
 {
         const char *cgit_config_env = getenv("CGIT_CONFIG");
+        const char *method = getenv("REQUEST_METHOD");
         const char *path;
         char *qry;
         int err, ttl;
 
         prepare_context(&ctx);
         cgit_repolist.length = 0;
         cgit_repolist.count = 0;
         cgit_repolist.repos = NULL;
@@ -472,16 +474,18 @@ int main(int argc, const char **argv)
                         free(qry);
                 } else
                         ctx.qry.raw = ctx.qry.url;
                 cgit_parse_url(ctx.qry.url);
         }
 
         ttl = calc_ttl();
         ctx.page.expires += ttl*60;
+        if (method && !strcmp(method, "HEAD"))
+                ctx.cfg.nocache = 1;
         if (ctx.cfg.nocache)
                 ctx.cfg.cache_size = 0;
         err = cache_process(ctx.cfg.cache_size, ctx.cfg.cache_root,
                             ctx.qry.raw, ttl, process_request, &ctx);
         if (err)
                 cgit_print_error(fmt("Error processing page: %s (%d)",
                                      strerror(err), err));
         return err;
diff --git a/cgit.h b/cgit.h
index 00aca4c..07a277a 100644
--- a/cgit.h
+++ b/cgit.h
@@ -175,16 +175,17 @@ struct cgit_config {
 
 struct cgit_page {
         time_t modified;
         time_t expires;
         size_t size;
         char *mimetype;
         char *charset;
         char *filename;
+        char *etag;
         char *title;
         int status;
         char *statusmsg;
 };
 
 struct cgit_context {
         struct cgit_query qry;
         struct cgit_config cfg;
diff --git a/ui-plain.c b/ui-plain.c
index 9a9ae7d..93a3a05 100644
--- a/ui-plain.c
+++ b/ui-plain.c
@@ -32,16 +32,17 @@ static void print_object(const unsigned char *sha1, const char *path)
                 return;
         }
         if (buffer_is_binary(buf, size))
                 ctx.page.mimetype = "application/octet-stream";
         else
                 ctx.page.mimetype = "text/plain";
         ctx.page.filename = fmt("%s", path);
         ctx.page.size = size;
+        ctx.page.etag = sha1_to_hex(sha1);
         cgit_print_http_headers(&ctx);
         html_raw(buf, size);
         match = 1;
 }
 
 static int walk_tree(const unsigned char *sha1, const char *base, int baselen,
                      const char *pathname, unsigned mode, int stage,
                      void *cbdata)
diff --git a/ui-shared.c b/ui-shared.c
index 29036d0..10be3c0 100644
--- a/ui-shared.c
+++ b/ui-shared.c
@@ -462,31 +462,37 @@ void cgit_print_age(time_t t, time_t max_relative, char *format)
                 return;
         }
         htmlf("<span class='age-years'>%.0f years</span>",
               secs * 1.0 / TM_YEAR);
 }
 
 void cgit_print_http_headers(struct cgit_context *ctx)
 {
+        const char *method = getenv("REQUEST_METHOD");
+
         if (ctx->page.status)
                 htmlf("Status: %d %s\n", ctx->page.status, ctx->page.statusmsg);
         if (ctx->page.mimetype && ctx->page.charset)
                 htmlf("Content-Type: %s; charset=%s\n", ctx->page.mimetype,
                       ctx->page.charset);
         else if (ctx->page.mimetype)
                 htmlf("Content-Type: %s\n", ctx->page.mimetype);
         if (ctx->page.size)
                 htmlf("Content-Length: %ld\n", ctx->page.size);
         if (ctx->page.filename)
                 htmlf("Content-Disposition: inline; filename=\"%s\"\n",
                       ctx->page.filename);
         htmlf("Last-Modified: %s\n", http_date(ctx->page.modified));
         htmlf("Expires: %s\n", http_date(ctx->page.expires));
+        if (ctx->page.etag)
+                htmlf("ETag: \"%s\"\n", ctx->page.etag);
         html("\n");
+        if (method && !strcmp(method, "HEAD"))
+                exit(0);
 }
 
 void cgit_print_docstart(struct cgit_context *ctx)
 {
         char *host = cgit_hosturl();
         html(cgit_doctype);
         html("<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>\n");
         html("<head>\n");