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apply: allow-binary-replacement.
A new option, --allow-binary-replacement, is introduced. When you feed a diff that records full SHA1 name of pre- and post-image blob on its index line to git-apply with this option, the post-image blob replaces the path if what you have in the working tree matches the pre-image _and_ post-image blob is already available in the object directory. Later we _might_ want to enhance the diff output to also include the full binary data of the post-image, to make this more useful, but this is good enough for local rebasing application. Signed-off-by: Junio C Hamano <junkio@cox.net>
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@ -8,7 +8,7 @@ git-apply - Apply patch on a git index file and a work tree
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SYNOPSIS
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--------
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'git-apply' [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [-z] [<patch>...]
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'git-apply' [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] [<patch>...]
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DESCRIPTION
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-----------
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@ -79,6 +79,17 @@ OPTIONS
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the result with this option, which would apply the
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deletion part but not addition part.
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--allow-binary-replacement::
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When applying a patch, which is a git-enhanced patch
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that was prepared to record the pre- and post-image object
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name in full, and the path being patched exactly matches
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the object the patch applies to (i.e. "index" line's
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pre-image object name is what is in the working tree),
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and the post-image object is available in the object
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database, use the post-image object as the patch
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result. This allows binary files to be patched in a
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very limited way.
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Author
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------
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Written by Linus Torvalds <torvalds@osdl.org>
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87
apply.c
87
apply.c
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@ -16,6 +16,7 @@
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// --numstat does numeric diffstat, and doesn't actually apply
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// --index-info shows the old and new index info for paths if available.
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//
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static int allow_binary_replacement = 0;
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static int check_index = 0;
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static int write_index = 0;
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static int diffstat = 0;
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@ -27,7 +28,7 @@ static int no_add = 0;
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static int show_index_info = 0;
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static int line_termination = '\n';
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static const char apply_usage[] =
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"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [-z] <patch>...";
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"git-apply [--stat] [--numstat] [--summary] [--check] [--index] [--apply] [--no-add] [--index-info] [--allow-binary-replacement] [-z] <patch>...";
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/*
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* For "diff-stat" like behaviour, we keep track of the biggest change
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@ -900,11 +901,13 @@ static int parse_chunk(char *buffer, unsigned long size, struct patch *patch)
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patch->is_binary = 1;
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/* Empty patch cannot be applied if:
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* - it is a binary patch or
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* - metadata does not change and is not a binary patch.
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* - it is a binary patch and we do not do binary_replace, or
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* - text patch without metadata change
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*/
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if ((apply || check) &&
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(patch->is_binary || !metadata_changes(patch)))
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(patch->is_binary
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? !allow_binary_replacement
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: !metadata_changes(patch)))
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die("patch with only garbage at line %d", linenr);
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}
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@ -1158,10 +1161,77 @@ static int apply_one_fragment(struct buffer_desc *desc, struct fragment *frag)
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static int apply_fragments(struct buffer_desc *desc, struct patch *patch)
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{
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struct fragment *frag = patch->fragments;
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const char *name = patch->old_name ? patch->old_name : patch->new_name;
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if (patch->is_binary) {
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unsigned char sha1[20];
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if (!allow_binary_replacement)
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return error("cannot apply binary patch to '%s' "
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"without --allow-binary-replacement",
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name);
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/* For safety, we require patch index line to contain
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* full 40-byte textual SHA1 for old and new, at least for now.
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*/
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if (strlen(patch->old_sha1_prefix) != 40 ||
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strlen(patch->new_sha1_prefix) != 40 ||
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get_sha1_hex(patch->old_sha1_prefix, sha1) ||
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get_sha1_hex(patch->new_sha1_prefix, sha1))
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return error("cannot apply binary patch to '%s' "
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"without full index line", name);
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if (patch->old_name) {
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unsigned char hdr[50];
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int hdrlen;
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/* See if the old one matches what the patch
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* applies to.
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*/
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write_sha1_file_prepare(desc->buffer, desc->size,
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"blob", sha1, hdr, &hdrlen);
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if (strcmp(sha1_to_hex(sha1), patch->old_sha1_prefix))
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return error("the patch applies to '%s' (%s), "
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"which does not match the "
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"current contents.",
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name, sha1_to_hex(sha1));
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}
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else {
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/* Otherwise, the old one must be empty. */
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if (desc->size)
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return error("the patch applies to an empty "
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"'%s' but it is not empty", name);
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}
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/* For now, we do not record post-image data in the patch,
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* and require the object already present in the recipient's
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* object database.
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*/
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if (desc->buffer) {
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free(desc->buffer);
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desc->alloc = desc->size = 0;
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}
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get_sha1_hex(patch->new_sha1_prefix, sha1);
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if (memcmp(sha1, null_sha1, 20)) {
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char type[10];
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unsigned long size;
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desc->buffer = read_sha1_file(sha1, type, &size);
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if (!desc->buffer)
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return error("the necessary postimage %s for "
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"'%s' does not exist",
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patch->new_sha1_prefix, name);
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desc->alloc = desc->size = size;
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}
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return 0;
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}
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while (frag) {
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if (apply_one_fragment(desc, frag) < 0)
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return error("patch failed: %s:%ld", patch->old_name, frag->oldpos);
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return error("patch failed: %s:%ld",
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name, frag->oldpos);
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frag = frag->next;
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}
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return 0;
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@ -1203,6 +1273,7 @@ static int check_patch(struct patch *patch)
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struct stat st;
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const char *old_name = patch->old_name;
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const char *new_name = patch->new_name;
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const char *name = old_name ? old_name : new_name;
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if (old_name) {
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int changed;
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@ -1277,7 +1348,7 @@ static int check_patch(struct patch *patch)
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}
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if (apply_data(patch, &st) < 0)
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return error("%s: patch does not apply", old_name);
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return error("%s: patch does not apply", name);
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return 0;
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}
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@ -1726,6 +1797,10 @@ int main(int argc, char **argv)
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diffstat = 1;
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continue;
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}
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if (!strcmp(arg, "--allow-binary-replacement")) {
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allow_binary_replacement = 1;
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continue;
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}
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if (!strcmp(arg, "--numstat")) {
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apply = 0;
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numstat = 1;
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@ -51,6 +51,14 @@ test_expect_failure 'check binary diff (copy) -- should fail.' \
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'git-checkout master
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git-apply --check C.diff'
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test_expect_failure 'check incomplete binary diff with replacement -- should fail.' \
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'git-checkout master
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git-apply --check --allow-binary-replacement B.diff'
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test_expect_failure 'check incomplete binary diff with replacement (copy) -- should fail.' \
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'git-checkout master
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git-apply --check --allow-binary-replacement C.diff'
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# Now we start applying them.
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test_expect_failure 'apply binary diff -- should fail.' \
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