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diff --git a/Sources.mm b/Sources.mm
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+/* Cydia - iPhone UIKit Front-End for Debian APT
+ * Copyright (C) 2008-2011  Jay Freeman (saurik)
+*/
+
+/* Modified BSD License {{{ */
+/*
+ *        Redistribution and use in source and binary
+ * forms, with or without modification, are permitted
+ * provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the
+ *    above copyright notice, this list of conditions
+ *    and the following disclaimer in the documentation
+ *    and/or other materials provided with the
+ *    distribution.
+ * 3. The name of the author may not be used to endorse
+ *    or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
+ * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+ * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
+ * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+/* }}} */
+
+#include <Foundation/Foundation.h>
+#include <CydiaSubstrate/CydiaSubstrate.h>
+#include <CyteKit/UCPlatform.h>
+
+#include <cstdio>
+
+extern _H<NSMutableDictionary> Sources_;
+extern _H<NSString> CydiaSource_;
+extern _H<NSString> Firmware_;
+extern bool Changed_;
+
+void CydiaWriteSources() {
+    FILE *file(fopen("/etc/apt/sources.list.d/cydia.list", "w"));
+    _assert(file != NULL);
+
+    NSString *distribution(@"ios");
+    if (Firmware_ != nil)
+        distribution = [distribution stringByAppendingString:[NSString stringWithFormat:@"-%@", (id) Firmware_]];
+
+    fprintf(file, "deb http://%s/ %s main\n",
+        [CydiaSource_ UTF8String],
+        [distribution UTF8String]
+    );
+
+    for (NSString *key in [Sources_ allKeys]) {
+        NSDictionary *source([Sources_ objectForKey:key]);
+
+        NSArray *sections([source objectForKey:@"Sections"] ?: [NSArray array]);
+
+        fprintf(file, "%s %s %s%s%s\n",
+            [[source objectForKey:@"Type"] UTF8String],
+            [[source objectForKey:@"URI"] UTF8String],
+            [[source objectForKey:@"Distribution"] UTF8String],
+            [sections count] == 0 ? "" : " ",
+            [[sections componentsJoinedByString:@" "] UTF8String]
+        );
+    }
+
+    fclose(file);
+}
+
+void CydiaAddSource(NSDictionary *source) {
+    [Sources_ setObject:source forKey:[NSString stringWithFormat:@"%@:%@:%@", [source objectForKey:@"Type"], [source objectForKey:@"URI"], [source objectForKey:@"Distribution"]]];
+    Changed_ = true;
+}
+
+void CydiaAddSource(NSString *href, NSString *distribution, NSArray *sections) {
+    CydiaAddSource([NSMutableDictionary dictionaryWithObjectsAndKeys:
+        @"deb", @"Type",
+        href, @"URI",
+        distribution, @"Distribution",
+        sections ?: [NSMutableArray array], @"Sections",
+    nil]);
+}