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-rw-r--r--README.md31
-rw-r--r--patches/0001-implement-CacheServer.patch341
-rw-r--r--patches/0001-support-http-header-to-indicate-an-expected-failure.patch43
3 files changed, 412 insertions, 3 deletions
diff --git a/README.md b/README.md
index a2b4cba..ff1091a 100644
--- a/README.md
+++ b/README.md
@@ -79,7 +79,11 @@ However `pacredir` sends a "*404 - not found*" response if the file is not
available in local network - and is skipped after just three misses.
This new feature is not configurable at runtime, so rebuilding `pacman` with
-this patch is the only way to make things work with `pacredir`.
+one of the following patches is the way to make things work with `pacredir`.
+
+### Disable server error limit
+
+This is the simplest workaround - just disable the server error limit.
--- a/lib/libalpm/dload.c
+++ b/lib/libalpm/dload.c
@@ -93,9 +97,30 @@ this patch is the only way to make things work with `pacredir`.
struct server_error_count {
char server[HOSTNAME_SIZE];
-Let's hope
+We can agree this is not to be desired - in general the feature is reasonable.
+
+### Support http header to indicate an expected failure
+
+This solution is simple, yet powerful:
+[Support http header to indicate an expected failure](patches/0001-support-http-header-to-indicate-an-expected-failure.patch)
+
+By setting an extra HTTP header `X-Pacman-Expected-Failure` the server can
+indicate that the failure is expected. The next server is tried without
+error message and without increasing the server's error count.
+
+Sadly upstream denied. 😢
+
+### Implement CacheServer
+
+A more complex solution that breaks current API is:
+[Implement CacheServer](patches/0001-implement-CacheServer.patch)
+
+This implements a new configuration option `CacheServer`. Adding a cache
+server makes it ignore the server error limit.
+
+Handling for soft failures is demanded in a long standing upstream bug, and
+the given patch could solve it:
[FS#23407 - Allow soft failures on Server URLs](https://bugs.archlinux.org/task/23407)
-is implemented any time soon.
Security
--------
diff --git a/patches/0001-implement-CacheServer.patch b/patches/0001-implement-CacheServer.patch
new file mode 100644
index 0000000..061d123
--- /dev/null
+++ b/patches/0001-implement-CacheServer.patch
@@ -0,0 +1,341 @@
+From a5239c9b76a515598afdb3e698dc82263341b1ad Mon Sep 17 00:00:00 2001
+From: Christian Hesse <mail@eworm.de>
+Date: Fri, 21 Jan 2022 16:11:02 +0100
+Subject: [PATCH] implement CacheServer
+
+This implements a new configuration option 'CacheServer'. Adding a cache
+server makes it ignore the server error limit.
+
+We have a struct that stores the server errors. Extend (and rename) this
+struct to store if this is a cache server. The errors are not increased
+for cache servers, thus they are never ignored.
+
+Signed-off-by: Christian Hesse <mail@eworm.de>
+---
+ doc/pacman.conf.5.asciidoc | 5 ++++
+ lib/libalpm/alpm.h | 7 +++--
+ lib/libalpm/db.c | 22 ++++++++++++----
+ lib/libalpm/db.h | 1 +
+ lib/libalpm/dload.c | 52 +++++++++++++++++++++++++++++++-------
+ lib/libalpm/dload.h | 2 ++
+ src/pacman/conf.c | 16 +++++++++---
+ src/pacman/conf.h | 1 +
+ src/pacman/pacman-conf.c | 1 +
+ 9 files changed, 88 insertions(+), 19 deletions(-)
+
+diff --git a/doc/pacman.conf.5.asciidoc b/doc/pacman.conf.5.asciidoc
+index 41f3ea03..a25e35eb 100644
+--- a/doc/pacman.conf.5.asciidoc
++++ b/doc/pacman.conf.5.asciidoc
+@@ -243,6 +243,11 @@ number.
+ *Server =* url::
+ A full URL to a location where the database, packages, and signatures (if
+ available) for this repository can be found.
++
++*CacheServer =* url::
++ A full URL to a location where packages, and signatures (if available)
++ for this repository can be found. There's no server error limit, log
++ messages are not shown for server side errors (http code >= 400).
+ +
+ During parsing, pacman will define the `$repo` variable to the name of the
+ current section. This is often utilized in files specified using the 'Include'
+diff --git a/lib/libalpm/alpm.h b/lib/libalpm/alpm.h
+index cdf71fdc..14889b9c 100644
+--- a/lib/libalpm/alpm.h
++++ b/lib/libalpm/alpm.h
+@@ -1322,16 +1322,19 @@ alpm_list_t *alpm_db_get_servers(const alpm_db_t *db);
+ /** Sets the list of servers for the database to use.
+ * @param db the database to set the servers. The list will be duped and
+ * the original will still need to be freed by the caller.
++ * @param cacheservers a char* list of cacheservers.
+ * @param servers a char* list of servers.
+ */
+-int alpm_db_set_servers(alpm_db_t *db, alpm_list_t *servers);
++int alpm_db_set_servers(alpm_db_t *db, alpm_list_t *cacheservers,
++ alpm_list_t *servers);
+
+ /** Add a download server to a database.
+ * @param db database pointer
+ * @param url url of the server
++ * @param cache 0 for regular server, 1 for cacheserver
+ * @return 0 on success, -1 on error (pm_errno is set accordingly)
+ */
+-int alpm_db_add_server(alpm_db_t *db, const char *url);
++int alpm_db_add_server(alpm_db_t *db, const char *url, const int cache);
+
+ /** Remove a download server from a database.
+ * @param db database pointer
+diff --git a/lib/libalpm/db.c b/lib/libalpm/db.c
+index ece8eae6..e9bca9c8 100644
+--- a/lib/libalpm/db.c
++++ b/lib/libalpm/db.c
+@@ -36,6 +36,7 @@
+ #include "alpm.h"
+ #include "package.h"
+ #include "group.h"
++#include "dload.h"
+
+ alpm_db_t SYMEXPORT *alpm_register_syncdb(alpm_handle_t *handle,
+ const char *treename, int siglevel)
+@@ -137,14 +138,22 @@ alpm_list_t SYMEXPORT *alpm_db_get_servers(const alpm_db_t *db)
+ return db->servers;
+ }
+
+-int SYMEXPORT alpm_db_set_servers(alpm_db_t *db, alpm_list_t *servers)
++int SYMEXPORT alpm_db_set_servers(alpm_db_t *db, alpm_list_t *cacheservers,
++ alpm_list_t *servers)
+ {
+ alpm_list_t *i;
+ ASSERT(db != NULL, return -1);
++ FREELIST(db->cacheservers);
+ FREELIST(db->servers);
++ for(i = cacheservers; i; i = i->next) {
++ char *url = i->data;
++ if(alpm_db_add_server(db, url, 1) != 0) {
++ return -1;
++ }
++ }
+ for(i = servers; i; i = i->next) {
+ char *url = i->data;
+- if(alpm_db_add_server(db, url) != 0) {
++ if(alpm_db_add_server(db, url, 0) != 0) {
+ return -1;
+ }
+ }
+@@ -164,7 +173,7 @@ static char *sanitize_url(const char *url)
+ return newurl;
+ }
+
+-int SYMEXPORT alpm_db_add_server(alpm_db_t *db, const char *url)
++int SYMEXPORT alpm_db_add_server(alpm_db_t *db, const char *url, const int cache)
+ {
+ char *newurl;
+
+@@ -178,8 +187,11 @@ int SYMEXPORT alpm_db_add_server(alpm_db_t *db, const char *url)
+ return -1;
+ }
+ db->servers = alpm_list_add(db->servers, newurl);
+- _alpm_log(db->handle, ALPM_LOG_DEBUG, "adding new server URL to database '%s': %s\n",
+- db->treename, newurl);
++ if(cache) {
++ server_make_cache(db->handle, newurl);
++ }
++ _alpm_log(db->handle, ALPM_LOG_DEBUG, "adding new %sserver URL to database '%s': %s\n",
++ cache ? "cache " : "", db->treename, newurl);
+
+ return 0;
+ }
+diff --git a/lib/libalpm/db.h b/lib/libalpm/db.h
+index c9400365..50812e28 100644
+--- a/lib/libalpm/db.h
++++ b/lib/libalpm/db.h
+@@ -69,6 +69,7 @@ struct _alpm_db_t {
+ char *_path;
+ alpm_pkghash_t *pkgcache;
+ alpm_list_t *grpcache;
++ alpm_list_t *cacheservers;
+ alpm_list_t *servers;
+ const struct db_operations *ops;
+
+diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
+index 7c27c3ea..3b3e5dc4 100644
+--- a/lib/libalpm/dload.c
++++ b/lib/libalpm/dload.c
+@@ -62,15 +62,16 @@ static int curl_gethost(const char *url, char *buffer, size_t buf_len);
+ * server blacklisting */
+ const unsigned int server_error_limit = 3;
+
+-struct server_error_count {
++struct server_opts {
+ char server[HOSTNAME_SIZE];
++ unsigned int cache;
+ unsigned int errors;
+ };
+
+-static struct server_error_count *find_server_errors(alpm_handle_t *handle, const char *server)
++static struct server_opts *find_server_errors(alpm_handle_t *handle, const char *server)
+ {
+ alpm_list_t *i;
+- struct server_error_count *h;
++ struct server_opts *h;
+ char hostname[HOSTNAME_SIZE];
+ /* key off the hostname because a host may serve multiple repos under
+ * different url's and errors are likely to be host-wide */
+@@ -83,7 +84,7 @@ static struct server_error_count *find_server_errors(alpm_handle_t *handle, cons
+ return h;
+ }
+ }
+- if((h = calloc(sizeof(struct server_error_count), 1))
++ if((h = calloc(sizeof(struct server_opts), 1))
+ && alpm_list_append(&handle->server_errors, h)) {
+ strcpy(h->server, hostname);
+ h->errors = 0;
+@@ -94,9 +95,38 @@ static struct server_error_count *find_server_errors(alpm_handle_t *handle, cons
+ }
+ }
+
++static int is_cache_server(alpm_handle_t *handle, const char *server)
++{
++ struct server_opts *h;
++ if((h = find_server_errors(handle, server))) {
++ return h->cache;
++ }
++ return 0;
++}
++
++static int should_skip_cacheserver(alpm_handle_t *handle, const char *server, const char *filepath)
++{
++ if(!is_cache_server(handle, server)) {
++ return 0;
++ }
++ if(filepath) {
++ int len = strlen(filepath);
++ return (len > 3 && strncmp(filepath + len - 3, ".db", 3) == 0) ? 1 : 0;
++ }
++ return 0;
++}
++
++void server_make_cache(alpm_handle_t *handle, const char *server)
++{
++ struct server_opts *h;
++ if((h = find_server_errors(handle, server))) {
++ h->cache = 1;
++ }
++}
++
+ static int should_skip_server(alpm_handle_t *handle, const char *server)
+ {
+- struct server_error_count *h;
++ struct server_opts *h;
+ if(server_error_limit && (h = find_server_errors(handle, server)) ) {
+ return h->errors >= server_error_limit;
+ }
+@@ -105,9 +135,10 @@ static int should_skip_server(alpm_handle_t *handle, const char *server)
+
+ static void server_increment_error(alpm_handle_t *handle, const char *server, int count)
+ {
+- struct server_error_count *h;
++ struct server_opts *h;
+ if(server_error_limit
+ && (h = find_server_errors(handle, server))
++ && !is_cache_server(handle, server)
+ && !should_skip_server(handle, server) ) {
+ h->errors += count;
+
+@@ -414,7 +445,8 @@ static int curl_retry_next_server(CURLM *curlm, CURL *curl, struct dload_payload
+ struct stat st;
+ alpm_handle_t *handle = payload->handle;
+
+- while(payload->servers && should_skip_server(handle, payload->servers->data)) {
++ while(payload->servers && (should_skip_server(handle, payload->servers->data)
++ || should_skip_cacheserver(handle, payload->servers->data, payload->filepath))) {
+ payload->servers = payload->servers->next;
+ }
+ if(!payload->servers) {
+@@ -511,7 +543,7 @@ static int curl_check_finished_download(CURLM *curlm, CURLMsg *msg,
+ /* non-translated message is same as libcurl */
+ snprintf(payload->error_buffer, sizeof(payload->error_buffer),
+ "The requested URL returned error: %ld", payload->respcode);
+- _alpm_log(handle, ALPM_LOG_ERROR,
++ _alpm_log(handle, is_cache_server(handle, payload->fileurl) ? ALPM_LOG_DEBUG : ALPM_LOG_ERROR,
+ _("failed retrieving file '%s' from %s : %s\n"),
+ payload->remote_name, hostname, payload->error_buffer);
+ server_soft_error(handle, payload->fileurl);
+@@ -769,7 +801,9 @@ static int curl_add_payload(alpm_handle_t *handle, CURLM *curlm,
+ ASSERT(!payload->filepath, GOTO_ERR(handle, ALPM_ERR_WRONG_ARGS, cleanup));
+ } else {
+ const char *server;
+- while(payload->servers && should_skip_server(handle, payload->servers->data)) {
++
++ while(payload->servers && (should_skip_server(handle, payload->servers->data)
++ || should_skip_cacheserver(handle, payload->servers->data, payload->filepath))) {
+ payload->servers = payload->servers->next;
+ }
+
+diff --git a/lib/libalpm/dload.h b/lib/libalpm/dload.h
+index 9438e04a..d117244d 100644
+--- a/lib/libalpm/dload.h
++++ b/lib/libalpm/dload.h
+@@ -58,6 +58,8 @@ struct dload_payload {
+ #endif
+ };
+
++void server_make_cache(alpm_handle_t *handle, const char *server);
++
+ void _alpm_dload_payload_reset(struct dload_payload *payload);
+
+ int _alpm_download(alpm_handle_t *handle,
+diff --git a/src/pacman/conf.c b/src/pacman/conf.c
+index f9edf75b..04bb478b 100644
+--- a/src/pacman/conf.c
++++ b/src/pacman/conf.c
+@@ -172,6 +172,7 @@ void config_repo_free(config_repo_t *repo)
+ return;
+ }
+ free(repo->name);
++ FREELIST(repo->cacheservers);
+ FREELIST(repo->servers);
+ free(repo);
+ }
+@@ -781,9 +782,9 @@ static char *replace_server_vars(config_t *c, config_repo_t *r, const char *s)
+ }
+ }
+
+-static int _add_mirror(alpm_db_t *db, char *value)
++static int _add_mirror(alpm_db_t *db, char *value, const int cache)
+ {
+- if(alpm_db_add_server(db, value) != 0) {
++ if(alpm_db_add_server(db, value, cache) != 0) {
+ /* pm_errno is set by alpm_db_setserver */
+ pm_printf(ALPM_LOG_ERROR, _("could not add server URL to database '%s': %s (%s)\n"),
+ alpm_db_get_name(db), value, alpm_strerror(alpm_errno(config->handle)));
+@@ -809,8 +810,14 @@ static int register_repo(config_repo_t *repo)
+ repo->usage, repo->name);
+ alpm_db_set_usage(db, repo->usage);
+
++ for(i = repo->cacheservers; i; i = alpm_list_next(i)) {
++ if(_add_mirror(db, i->data, 1) != 0) {
++ return 1;
++ }
++ }
++
+ for(i = repo->servers; i; i = alpm_list_next(i)) {
+- if(_add_mirror(db, i->data) != 0) {
++ if(_add_mirror(db, i->data, 0) != 0) {
+ return 1;
+ }
+ }
+@@ -993,6 +1000,9 @@ static int _parse_repo(const char *key, char *value, const char *file,
+ if(strcmp(key, "Server") == 0) {
+ CHECK_VALUE(value);
+ repo->servers = alpm_list_add(repo->servers, strdup(value));
++ } else if(strcmp(key, "CacheServer") == 0) {
++ CHECK_VALUE(value);
++ repo->cacheservers = alpm_list_add(repo->cacheservers, strdup(value));
+ } else if(strcmp(key, "SigLevel") == 0) {
+ CHECK_VALUE(value);
+ alpm_list_t *values = NULL;
+diff --git a/src/pacman/conf.h b/src/pacman/conf.h
+index f7916ca9..f242f522 100644
+--- a/src/pacman/conf.h
++++ b/src/pacman/conf.h
+@@ -37,6 +37,7 @@ typedef struct __colstr_t {
+
+ typedef struct __config_repo_t {
+ char *name;
++ alpm_list_t *cacheservers;
+ alpm_list_t *servers;
+ int usage;
+ int siglevel;
+diff --git a/src/pacman/pacman-conf.c b/src/pacman/pacman-conf.c
+index a9d1f52b..db648d4c 100644
+--- a/src/pacman/pacman-conf.c
++++ b/src/pacman/pacman-conf.c
+@@ -236,6 +236,7 @@ static void dump_repo(config_repo_t *repo)
+ {
+ show_usage("Usage", repo->usage);
+ show_siglevel("SigLevel", repo->siglevel, 0);
++ show_list_str("CacheServer", repo->cacheservers);
+ show_list_str("Server", repo->servers);
+ }
+
diff --git a/patches/0001-support-http-header-to-indicate-an-expected-failure.patch b/patches/0001-support-http-header-to-indicate-an-expected-failure.patch
new file mode 100644
index 0000000..6bc977a
--- /dev/null
+++ b/patches/0001-support-http-header-to-indicate-an-expected-failure.patch
@@ -0,0 +1,43 @@
+From b50863ad56c3c972e4bfbc9108523fee267d63fa Mon Sep 17 00:00:00 2001
+From: Christian Hesse <mail@eworm.de>
+Date: Fri, 21 May 2021 09:52:34 +0200
+Subject: [PATCH] support http header to indicate an expected failure
+
+By setting an extra HTTP header 'X-Pacman-Expected-Failure' the server can
+indicate that the failure is expected. The next server is tried without
+error message and without increasing the server's error count.
+
+This can be used by servers that are not expected to be complete, for
+example when serving a local cache.
+
+Signed-off-by: Christian Hesse <mail@eworm.de>
+---
+ lib/libalpm/dload.c | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/lib/libalpm/dload.c b/lib/libalpm/dload.c
+index 7c27c3ea..d39125ca 100644
+--- a/lib/libalpm/dload.c
++++ b/lib/libalpm/dload.c
+@@ -277,6 +277,7 @@ static size_t dload_parseheader_cb(void *ptr, size_t size, size_t nmemb, void *u
+ const char *fptr, *endptr = NULL;
+ const char * const cd_header = "Content-Disposition:";
+ const char * const fn_key = "filename=";
++ const char * const xpef_header = "X-Pacman-Expected-Failure:";
+ struct dload_payload *payload = (struct dload_payload *)user;
+ long respcode;
+
+@@ -303,6 +304,13 @@ static size_t dload_parseheader_cb(void *ptr, size_t size, size_t nmemb, void *u
+ }
+ }
+
++ /* By setting an extra HTTP header 'X-Pacman-Expected-Failure' the server can
++ indicate that the failure is expected. The next server is tried without
++ error message and without increasing the server's error count. */
++ if(_alpm_raw_ncmp(xpef_header, ptr, strlen(xpef_header)) == 0) {
++ payload->errors_ok = 1;
++ }
++
+ curl_easy_getinfo(payload->curl, CURLINFO_RESPONSE_CODE, &respcode);
+ if(payload->respcode != respcode) {
+ payload->respcode = respcode;