Alter git-checkout reflog message to include "from" branch

diff --git a/sha1_file.c b/sha1_file.c
index a3637d7e5b7763b97b5325923e586722f5e431bf..1efd9ae19a84dbc2765d4011ea06b2145e86ebb3 100644 (file)
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -33,7 +33,7 @@ const unsigned char null_sha1[20];
 
 static unsigned int sha1_file_open_flag = O_NOATIME;
 
-signed char hexval_table[256] = {
+const signed char hexval_table[256] = {
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 00-07 */
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 08-0f */
         -1, -1, -1, -1, -1, -1, -1, -1,                /* 10-17 */
@@ -193,7 +193,7 @@ char *sha1_pack_name(const unsigned char *sha1)
                *buf++ = hex[val >> 4];
                *buf++ = hex[val & 0xf];
        }
-       
+
        return base;
 }
 
@@ -218,7 +218,7 @@ char *sha1_pack_index_name(const unsigned char *sha1)
                *buf++ = hex[val >> 4];
                *buf++ = hex[val & 0xf];
        }
-       
+
        return base;
 }
 
@@ -352,10 +352,14 @@ static void read_info_alternates(const char * relative_base, int depth)
        char *map;
        size_t mapsz;
        struct stat st;
-       char path[PATH_MAX];
+       const char alt_file_name[] = "info/alternates";
+       /* Given that relative_base is no longer than PATH_MAX,
+          ensure that "path" has enough space to append "/", the
+          file name, "info/alternates", and a trailing NUL.  */
+       char path[PATH_MAX + 1 + sizeof alt_file_name];
        int fd;
 
-       sprintf(path, "%s/info/alternates", relative_base);
+       sprintf(path, "%s/%s", relative_base, alt_file_name);
        fd = open(path, O_RDONLY);
        if (fd < 0)
                return;
@@ -413,7 +417,7 @@ static size_t peak_pack_mapped;
 static size_t pack_mapped;
 struct packed_git *packed_git;
 
-void pack_report()
+void pack_report(void)
 {
        fprintf(stderr,
                "pack_report: getpagesize()            = %10" SZ_FMT "\n"
@@ -510,7 +514,10 @@ static int check_packed_git_idx(const char *path,  struct packed_git *p)
                 * for offsets larger than 2^31.
                 */
                unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
-               if (idx_size < min_size || idx_size > min_size + (nr - 1)*8) {
+               unsigned long max_size = min_size;
+               if (nr)
+                       max_size += (nr - 1)*8;
+               if (idx_size < min_size || idx_size > max_size) {
                        munmap(idx_map, idx_size);
                        return error("wrong index file size in %s", path);
                }
@@ -531,7 +538,7 @@ static int check_packed_git_idx(const char *path,  struct packed_git *p)
        return 0;
 }
 
-int open_pack_index (struct packed_git *p)
+int open_pack_index(struct packed_git *p)
 {
        char *idx_name;
        int ret;
@@ -833,7 +840,10 @@ void install_packed_git(struct packed_git *pack)
 
 static void prepare_packed_git_one(char *objdir, int local)
 {
-       char path[PATH_MAX];
+       /* Ensure that this buffer is large enough so that we can
+          append "/pack/" without clobbering the stack even if
+          strlen(objdir) were PATH_MAX.  */
+       char path[PATH_MAX + 1 + 4 + 1 + 1];
        int len;
        DIR *dir;
        struct dirent *de;
@@ -855,6 +865,9 @@ static void prepare_packed_git_one(char *objdir, int local)
                if (!has_extension(de->d_name, ".idx"))
                        continue;
 
+               if (len + namelen + 1 > sizeof(path))
+                       continue;
+
                /* Don't reopen a pack we already have. */
                strcpy(path + len, de->d_name);
                for (p = packed_git; p; p = p->next) {
@@ -959,7 +972,7 @@ int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long siz
        return hashcmp(sha1, real_sha1) ? -1 : 0;
 }
 
-void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
+static void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 {
        struct stat st;
        void *map;
@@ -1139,7 +1152,7 @@ static int parse_sha1_header(const char *hdr, unsigned long *sizep)
        unsigned long size;
 
        /*
-        * The type can be at most ten bytes (including the 
+        * The type can be at most ten bytes (including the
         * terminating '\0' that we add), and is followed by
         * a space.
         */
@@ -1687,20 +1700,25 @@ static int matches_pack_name(struct packed_git *p, const char *ig)
 
 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, const char **ignore_packed)
 {
+       static struct packed_git *last_found = (void *)1;
        struct packed_git *p;
        off_t offset;
 
        prepare_packed_git();
+       if (!packed_git)
+               return 0;
+       p = (last_found == (void *)1) ? packed_git : last_found;
 
-       for (p = packed_git; p; p = p->next) {
+       do {
                if (ignore_packed) {
                        const char **ig;
                        for (ig = ignore_packed; *ig; ig++)
                                if (!matches_pack_name(p, *ig))
                                        break;
                        if (*ig)
-                               continue;
+                               goto next;
                }
+
                offset = find_pack_entry_one(sha1, p);
                if (offset) {
                        /*
@@ -1713,18 +1731,27 @@ static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e, cons
                         */
                        if (p->pack_fd == -1 && open_packed_git(p)) {
                                error("packfile %s cannot be accessed", p->pack_name);
-                               continue;
+                               goto next;
                        }
                        e->offset = offset;
                        e->p = p;
                        hashcpy(e->sha1, sha1);
+                       last_found = p;
                        return 1;
                }
-       }
+
+               next:
+               if (p == last_found)
+                       p = packed_git;
+               else
+                       p = p->next;
+               if (p == last_found)
+                       p = p->next;
+       } while (p);
        return 0;
 }
 
-struct packed_git *find_sha1_pack(const unsigned char *sha1, 
+struct packed_git *find_sha1_pack(const unsigned char *sha1,
                                  struct packed_git *packs)
 {
        struct packed_git *p;