termux-packages/packages/coreutils/verify-prefix.patch.txt

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Patch to encourage third-parties to compile own packages instead
of using hosted by Termux.
diff -uNr coreutils-8.32/src/coreutils.c coreutils-8.32.mod/src/coreutils.c
--- coreutils-8.32/src/coreutils.c 2020-01-01 16:13:12.000000000 +0200
+++ coreutils-8.32.mod/src/coreutils.c 2020-09-27 23:37:17.025160590 +0300
@@ -26,6 +26,8 @@
# include <sys/prctl.h>
#endif
+#include <unistd.h>
+
#include "system.h"
#include "die.h"
#include "error.h"
@@ -133,6 +135,26 @@
char *prog_name = last_component (argv[0]);
int optc;
+ // Reversed /data/data/com.termux/files/usr. Prevents patching with 'sed'
+ // by using equal-size prefixes.
+ const char termux_prefix_obfs[] = "rsu/selif/xumret.moc/atad/atad/";
+ char termux_prefix[sizeof(termux_prefix_obfs)/sizeof(char)] = {0};
+ int termux_prefix_len = sizeof(termux_prefix_obfs)/sizeof(char) - 1;
+
+ // Decode.
+ for (int i=0; i<termux_prefix_len; i++) {
+ termux_prefix[termux_prefix_len - 1 - i] = termux_prefix_obfs[i];
+ }
+
+ // Stub to verify that we can access @TERMUX_PREFIX@ and it is a directory.
+ // If checks failed, then we probably running in incompatible environment.
+ // In this case warn user and exit with status 1.
+ if (access(termux_prefix, R_OK) != 0) {
+ fprintf(stderr, "Warning: aborting execution because %s is not accessible.\n", termux_prefix);
+ fprintf(stderr, "Please make sure that program is compiled with correct prefix.\n");
+ return 1;
+ }
+
/* Map external name to internal name. */
char ginstall[] = "ginstall";
if (STREQ (prog_name, "install"))