1 files changed, 109 insertions, 3 deletions

diff --git a/debian/bash.preinst.c b/debian/bash.preinst.c
index ff22653..524e126 100644
--- a/debian/bash.preinst.c
+++ b/debian/bash.preinst.c
@@ -1,5 +1,6 @@
 /* Copyright (c) 1999 Anthony Towns
  * Copyright (c) 2000, 2002 Matthias Klose
+ * Copyright (c) 2008 Canonical Ltd
  *
  * You may freely use, distribute, and modify this program.
  */
@@ -20,6 +21,8 @@
 #define PATH_MAX 4096
 #endif
 
+#include "md5.h"
+
 int check_predepends(void)
 {
     pid_t child;
@@ -53,6 +56,81 @@ int check_predepends(void)
     return EXIT_FAILURE;
 }
 
+#define BUFSIZE 8192
+
+int md5sum_match(char *fn, char* fn_digest)
+{
+  md5_state_t md5;
+  md5_byte_t digest[16];
+  unsigned char hexdigest[33];
+  int i, j, fd;
+  size_t nbytes;
+  md5_byte_t buf[BUFSIZE];
+
+  // if not existant, md5sums don't match
+  if (access(fn, R_OK))
+    return 0;
+  if ((fd = open(fn, O_RDONLY)) == -1)
+    return 0;
+  
+  md5_init(&md5);
+  while (nbytes = read(fd, buf, BUFSIZE))
+    md5_append(&md5, buf, nbytes);
+  md5_finish(&md5, digest);
+  close(fd);
+
+  for (i = j = 0; i < 16; i++) {
+    unsigned char c;
+    c = (digest[i] >> 4) & 0xf;
+    c = (c > 9) ? c + 'a' - 10 : c + '0';
+    hexdigest[j++] = c;
+    c = (digest[i] & 0xf);
+    c = (c > 9) ? c + 'a' - 10 : c + '0';
+    hexdigest[j++] = c;
+  }
+  hexdigest[j] = '\0';
+#ifdef NDEBUG
+  fprintf(stderr, "fn=%s, md5sum=%s, expected=%s\n", fn, hexdigest, fn_digest);
+#endif
+  return !strcmp(fn_digest, hexdigest);
+}
+
+int unmodified_file(char *fn, int md5sumc, unsigned char* md5sumv[])
+{
+  int i;
+
+  // if not existant, pretend its unmodified
+  if (access(fn, R_OK))
+    return 1;
+  for (i = 0; i < md5sumc; i++) {
+    if (md5sum_match(fn, md5sumv[i]))
+      return 1;
+  }
+  return 0;
+}
+
+unsigned char *md5sumv_bash_profile[] = {
+  "d1a8c44e7dd1bed2f3e75d1343b6e4e1", // dapper, edgy, etch
+  "0bc1802860b758732b862ef973cd79ff", // feisty, gutsy
+};
+const int md5sumc_bash_profile = sizeof(md5sumv_bash_profile) / sizeof (char *);
+
+unsigned char *md5sumv_profile[] = {
+  "7d97942254c076a2ea5ea72180266420", // feisty, gutsy
+};
+const int md5sumc_profile = sizeof(md5sumv_profile) / sizeof (char *);
+
+#ifdef BC_CONFIG
+unsigned char *md5sumv_completion[] = {
+  "2bc0b6cf841eefd31d607e618f1ae29d", // dapper
+  "ae1d298e51ea7f8253eea8b99333561f", // edgy
+  "adc2e9fec28bd2d4a720e725294650f0", // feisty
+  "c8bce25ea68fb0312579a421df99955c", // gutsy, and last one in bash
+  "9da8d1c95748865d516764fb9af82af9", // etch, sid (last one in bash)
+};
+const int md5sumc_completion = sizeof(md5sumv_completion) / sizeof (char *);
+#endif
+
 char *check_diversion(void)
 {
     pid_t child;
@@ -105,13 +183,40 @@ char *check_diversion(void)
 const char *msg =
   "As bash for Debian is destined to provide a working /bin/sh (pointing to\n"
   "/bin/bash) your link will be overwritten by a default link.\n\n"
-  "If you don't want further upgrades to overwrite your customization,\n"
-  "please read /usr/share/doc/bash/README.Debian for a more permanent solution.\n\n"
+  "If you don't want further upgrades to overwrite your customization, please\n"
+  "read /usr/share/doc/bash/README.Debian.gz for a more permanent solution.\n\n"
   "[Press RETURN to continue]";
 
 int main(void) {
     int targetlen;
-    char target[PATH_MAX+1], answer[1024];
+    char target[PATH_MAX+1], answer[1024], *fn;
+
+    fn = "/etc/skel/.bash_profile";
+    if (!access(fn, R_OK)) {
+      if (unmodified_file(fn, md5sumc_bash_profile, md5sumv_bash_profile)) {
+	printf("removing %s in favour of /etc/skel/.profile\n", fn);
+	unlink(fn);
+      }
+      else {
+	fn = "/etc/skel/.profile";
+	if (!access(fn, R_OK)) {
+	  if (unmodified_file(fn, md5sumc_profile, md5sumv_profile)) {
+	    printf("renaming /etc/skel/.bash_profile to %s\n", fn);
+	    rename("/etc/skel/.bash_profile", fn);
+	  }
+	}
+      }
+    }
+
+#ifdef BC_CONFIG
+    fn = "/etc/bash_completion";
+    if (!access(fn, R_OK)) {
+      if (unmodified_file(fn, md5sumc_completion, md5sumv_completion)) {
+	printf("removing unmodified %s, now in package bash-completion\n", fn);
+	unlink(fn);
+      }
+    }
+#endif
 
     if (check_predepends() != EXIT_SUCCESS) {
 	printf("\nPlease upgrade to a new version of dpkg\n\n");
@@ -140,5 +245,6 @@ int main(void) {
 	fgets(answer, 1024, stdin);
 	return EXIT_SUCCESS;
     }
+
     return EXIT_SUCCESS;
 }