gotwebd: drop redundant NULL check qs is guaranteed to be not NULL reached that point.

gotwebd: remove useless comment should be placed further down, after BLOB and RSS are handled, but the call to `gotweb_render_header' is successfully clear on its own.

portable: gotwebd: use template This updates -portable's gotwebd instance to make use of the new templating engine.

gotwebd: add an RSS feed for the tags ok tracey@

gotwebd: templateify gotweb_render_commits ok tracey@

gotwebd: templateify gotweb_render_navs ok tracey@

gotwebd: drop index_page_str and page_str gotwebd uses sprintf to update index_page_str and page_str if they were negative. While this specific usage is safe, let's drop it. Since the index_page_str and page_str fields are never read from, remove them. This saves two allocations per request too. ok tracey@

gotwebd: fix broken navigation in commits page since 8d02314 ok tracey@

gotwebd: start using the template system ok tracey@

gotwebd: simplify bit of gotweb_process_request ok tracey

gotwebd: provide maximum value for the description and cloneurl ok stsp@

portable: sha1.h

gotwebd: rework gotweb_get_repo_{description,cloneurl} - use openat(2) since we've already opened the containing dir - use fstat(2) instead of multiple seeks - don't special case len == 0 ok and improvements by stsp

gotwebd: drop unused path parameter from got_get_repo_{owner,age} ok jamsek

gotwebd: simplify gotweb_render_index - drops the double loop; paginate in one go - avoid lstat + got_path_dir_is_empty for each entry: use dt_type if provided by the underlying filesystem - fixes a memleak: before `continue' we need to call gotweb_free_repo_dir ok stsp

gotwebd: use prev_disp to decide when to we've reached max_repos instead of hardcoding d_i - 2 and so expecting only "." and ".." as skipped entries, use t->prev_disp that is the number of repositories traversed until now (both skipped due to the pagination and the ones actually rendered.) ok jamsek

gotwebd: fix memleak in error path ok stsp@

add respect_exportok flag, defaulting to off allows to hide repositories if they have the magic git-daemon-export-ok file ok op@ tracey@ stsp@

send a newline first if erroring out in plaintext mode otherwise, the webserver might complain: 'upstream sent invalid header: "gotwebd\x20..." while reading response header from upstream' ok stsp@

gotwebd: drop needless NULL check We can assume that the querystring was initialized when we reach gotweb_render_header. ok tracey@

gotwebd: percent-encode generated URLs This adds a new helper function `gotweb_link' that outputs an HTML link with the parameter correctly escaped. ok stsp@

gotwebd: add missing closing for div tags_content reported by the W3C validator.

gotwebd: fix page title due to an error in the order of the arguments to fcgi_printf that I've introduced last time I touched gotweb_render_header the title is now "/" (or SCRIPT_NAME) and one assets (the safari pinned tab svg) is a funny URL :)

gotwebd: shrink struct server keeping GOTWEBD_REPO_CACHESIZE * sizeof(struct cache_repo) inside the struct server makes it too large for imsg on some platforms (linux at least.) Instead, store a pointer and allocate the array when it's received on the child processes. ok stsp@

gotwebd: percent-decode the received query string ok stsp@