From 595b3745f1091e9e4b5ffeb256c9ba25b2533221 Mon Sep 17 00:00:00 2001
From: Timo Teräs <timo.teras@iki.fi>
Date: Mon, 24 Apr 2023 16:53:11 +0300
Subject: libfetch, apk: display warning for permanent redirects during init

fixes #10776
---
 libfetch/fetch.c |  1 +
 libfetch/fetch.h |  4 ++++
 libfetch/http.c  |  2 ++
 src/apk.c        | 16 ++++++++++++++++
 4 files changed, 23 insertions(+)

diff --git a/libfetch/fetch.c b/libfetch/fetch.c
index 68d920c..efee05f 100644
--- a/libfetch/fetch.c
+++ b/libfetch/fetch.c
@@ -39,6 +39,7 @@
 #include "fetch.h"
 #include "common.h"
 
+fetch_redirect_t fetchRedirectMethod;
 auth_t	 fetchAuthMethod;
 int	 fetchLastErrCode;
 char	 fetchLastErrString[MAXERRSTRING];
diff --git a/libfetch/fetch.h b/libfetch/fetch.h
index 0c07c05..15c60e9 100644
--- a/libfetch/fetch.h
+++ b/libfetch/fetch.h
@@ -164,6 +164,10 @@ char		*fetchUnquoteFilename(struct url *);
 void		 fetchConnectionCacheInit(int, int);
 void		 fetchConnectionCacheClose(void);
 
+/* Redirects */
+typedef void (*fetch_redirect_t)(int, const struct url *, const struct url *);
+extern fetch_redirect_t	 fetchRedirectMethod;
+
 /* Authentication */
 typedef int (*auth_t)(struct url *);
 extern auth_t		 fetchAuthMethod;
diff --git a/libfetch/http.c b/libfetch/http.c
index abc3ae6..2f80240 100644
--- a/libfetch/http.c
+++ b/libfetch/http.c
@@ -1061,6 +1061,8 @@ http_request(struct url *URL, const char *op, struct url_stat *us,
 				}
 				new->offset = url->offset;
 				new->length = url->length;
+				if (fetchRedirectMethod)
+					fetchRedirectMethod(conn->err, url, new);
 				break;
 			case hdr_transfer_encoding:
 				/* XXX weak test*/
diff --git a/src/apk.c b/src/apk.c
index 3baae46..3073584 100644
--- a/src/apk.c
+++ b/src/apk.c
@@ -488,6 +488,20 @@ static int remove_empty_strings(int count, char **args)
 	return j;
 }
 
+static void fetch_redirect(int code, const struct url *cur, const struct url *next)
+{
+	char *url;
+
+	switch (code) {
+	case 301: // Moved Permanently
+	case 308: // Permanent Redirect
+		url = fetchStringifyURL(next);
+		apk_warning("Permanently redirected to %s", url);
+		free(url);
+		break;
+	}
+}
+
 int main(int argc, char **argv)
 {
 	void *ctx = NULL;
@@ -523,6 +537,7 @@ int main(int argc, char **argv)
 	init_openssl();
 	setup_automatic_flags();
 	fetchTimeout = 60;
+	fetchRedirectMethod = fetch_redirect;
 	fetchConnectionCacheInit(32, 4);
 
 	r = parse_options(argc, argv, applet, ctx, &dbopts);
@@ -601,6 +616,7 @@ int main(int argc, char **argv)
 
 	apk_string_array_resize(&args, argc);
 	memcpy(args->item, argv, argc * sizeof(*argv));
+	fetchRedirectMethod = NULL;
 
 	r = applet->main(ctx, &db, args);
 	signal(SIGINT, SIG_IGN);
-- 
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