From 73134b6d3f700bb9e6c66aa2f099de644c6b8d09 Mon Sep 17 00:00:00 2001 From: Linus Torvalds Date: Sun, 10 Apr 2005 14:03:58 -0700 Subject: [PATCH] Add "-R" flag to "diff-tree", so that it will recursively traverse a tree of trees as it diffs them. This makes diff-tree usable again in the new world order. --- cache.h | 8 +++--- diff-tree.c | 80 ++++++++++++++++++++++++++++++++++++++++++++---------------- read-cache.c | 8 +++--- 3 files changed, 67 insertions(+), 29 deletions(-) diff --git a/cache.h b/cache.h index 1e006bfa..4b101188 100644 --- a/cache.h +++ b/cache.h @@ -87,15 +87,15 @@ extern int cache_match_stat(struct cache_entry *ce, struct stat *st); #define DATA_CHANGED 0x0020 /* Return a statically allocated filename matching the sha1 signature */ -extern char *sha1_file_name(unsigned char *sha1); +extern char *sha1_file_name(const unsigned char *sha1); /* Write a memory buffer out to the sha file */ -extern int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size); +extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size); /* Read and unpack a sha1 file into memory, write memory to a sha1 file */ -extern void * map_sha1_file(unsigned char *sha1, unsigned long *size); +extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size); extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size); -extern void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size); +extern void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size); extern int write_sha1_file(char *buf, unsigned len, unsigned char *return_sha1); extern int check_sha1_signature(unsigned char *sha1, void *buf, unsigned long size); diff --git a/diff-tree.c b/diff-tree.c index 2f04d1eb..207617c8 100644 --- a/diff-tree.c +++ b/diff-tree.c @@ -1,8 +1,10 @@ #include "cache.h" -struct tree_entry; +static int recursive = 0; -static struct tree_entry *update_tree_entry(void **bufp, unsigned long *sizep) +static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst); + +static void update_tree_entry(void **bufp, unsigned long *sizep) { void *buf = *bufp; unsigned long size = *sizep; @@ -12,7 +14,6 @@ static struct tree_entry *update_tree_entry(void **bufp, unsigned long *sizep) usage("corrupt tree file"); *bufp = buf + len; *sizep = size - len; - return buf; } static const unsigned char *extract(void *tree, unsigned long size, const char **pathp, unsigned int *modep) @@ -27,54 +28,70 @@ static const unsigned char *extract(void *tree, unsigned long size, const char * return sha1; } -static void show_file(const char *prefix, void *tree, unsigned long size) +static void show_file(const char *prefix, void *tree, unsigned long size, const char *base) { unsigned mode; const char *path; const unsigned char *sha1 = extract(tree, size, &path, &mode); - printf("%s%o %s %s%c", prefix, mode, sha1_to_hex(sha1), path, 0); + printf("%s%o %s %s%s%c", prefix, mode, sha1_to_hex(sha1), base, path, 0); } -static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2) +static int compare_tree_entry(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst) { unsigned mode1, mode2; const char *path1, *path2; const unsigned char *sha1, *sha2; - int cmp; + int cmp, pathlen1, pathlen2; sha1 = extract(tree1, size1, &path1, &mode1); sha2 = extract(tree2, size2, &path2, &mode2); - cmp = cache_name_compare(path1, strlen(path1), path2, strlen(path2)); + pathlen1 = strlen(path1); + pathlen2 = strlen(path2); + cmp = cache_name_compare(path1, pathlen1, path2, pathlen2); if (cmp < 0) { - show_file("-", tree1, size1); + show_file("-", tree1, size1, src); return -1; } if (cmp > 0) { - show_file("+", tree2, size2); + show_file("+", tree2, size2, dst); return 1; } if (!memcmp(sha1, sha2, 20) && mode1 == mode2) return 0; - show_file("<", tree1, size1); - show_file(">", tree2, size2); + if (recursive && S_ISDIR(mode1) && S_ISDIR(mode2)) { + int srclen = strlen(src); + int dstlen = strlen(dst); + char *srcbase = malloc(srclen + pathlen1 + 2); + char *dstbase = malloc(srclen + pathlen1 + 2); + memcpy(srcbase, src, srclen); + memcpy(srcbase + srclen, path1, pathlen1); + memcpy(srcbase + srclen + pathlen1, "/", 2); + memcpy(dstbase, dst, dstlen); + memcpy(dstbase + dstlen, path2, pathlen2); + memcpy(dstbase + dstlen + pathlen2, "/", 2); + return diff_tree_sha1(sha1, sha2, srcbase, dstbase); + } + + show_file("<", tree1, size1, src); + show_file(">", tree2, size2, dst); return 0; } -static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2) +static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned long size2, const char *src, const char *dst) { while (size1 | size2) { if (!size1) { - show_file("+", tree2, size2); + show_file("+", tree2, size2, dst); update_tree_entry(&tree2, &size2); continue; } if (!size2) { - show_file("-", tree1, size1); + show_file("-", tree1, size1, src); update_tree_entry(&tree1, &size1); continue; } - switch (compare_tree_entry(tree1, size1, tree2, size2)) { + switch (compare_tree_entry(tree1, size1, tree2, size2, src, dst)) { case -1: update_tree_entry(&tree1, &size1); continue; @@ -90,20 +107,41 @@ static int diff_tree(void *tree1, unsigned long size1, void *tree2, unsigned lon return 0; } -int main(int argc, char **argv) +static int diff_tree_sha1(const unsigned char *old, const unsigned char *new, const char *src, const char *dst) { - unsigned char old[20], new[20]; void *tree1, *tree2; unsigned long size1, size2; char type[20]; + int retval; - if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new)) - usage("diff-tree "); tree1 = read_sha1_file(old, type, &size1); if (!tree1 || strcmp(type, "tree")) usage("unable to read source tree"); tree2 = read_sha1_file(new, type, &size2); if (!tree2 || strcmp(type, "tree")) usage("unable to read destination tree"); - return diff_tree(tree1, size1, tree2, size2); + retval = diff_tree(tree1, size1, tree2, size2, src, dst); + free(tree1); + free(tree2); + return retval; +} + +int main(int argc, char **argv) +{ + unsigned char old[20], new[20]; + + while (argc > 3) { + char *arg = argv[1]; + argv++; + argc--; + if (!strcmp(arg, "-R")) { + recursive = 1; + continue; + } + usage("diff-tree [-R] "); + } + + if (argc != 3 || get_sha1_hex(argv[1], old) || get_sha1_hex(argv[2], new)) + usage("diff-tree "); + return diff_tree_sha1(old, new, "", ""); } diff --git a/read-cache.c b/read-cache.c index ebace34d..53da5006 100644 --- a/read-cache.c +++ b/read-cache.c @@ -63,7 +63,7 @@ char * sha1_to_hex(const unsigned char *sha1) * careful about using it. Do a "strdup()" if you need to save the * filename. */ -char *sha1_file_name(unsigned char *sha1) +char *sha1_file_name(const unsigned char *sha1) { int i; static char *name, *base; @@ -99,7 +99,7 @@ int check_sha1_signature(unsigned char *sha1, void *map, unsigned long size) return memcmp(sha1, real_sha1, 20) ? -1 : 0; } -void *map_sha1_file(unsigned char *sha1, unsigned long *size) +void *map_sha1_file(const unsigned char *sha1, unsigned long *size) { char *filename = sha1_file_name(sha1); int fd = open(filename, O_RDONLY); @@ -158,7 +158,7 @@ void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned l return buf; } -void * read_sha1_file(unsigned char *sha1, char *type, unsigned long *size) +void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size) { unsigned long mapsize; void *map, *buf; @@ -208,7 +208,7 @@ int write_sha1_file(char *buf, unsigned len, unsigned char *returnsha1) return 0; } -int write_sha1_buffer(unsigned char *sha1, void *buf, unsigned int size) +int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size) { char *filename = sha1_file_name(sha1); int fd; -- 2.11.0