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Stefan Beller 644eb60bd0 builtin/describe.c: describe a blob 
Sometimes users are given a hash of an object and they want to
identify it further (ex.: Use verify-pack to find the largest blobs,
but what are these? or [1])

When describing commits, we try to anchor them to tags or refs, as these
are conceptually on a higher level than the commit. And if there is no ref
or tag that matches exactly, we're out of luck.  So we employ a heuristic
to make up a name for the commit. These names are ambiguous, there might
be different tags or refs to anchor to, and there might be different
path in the DAG to travel to arrive at the commit precisely.

When describing a blob, we want to describe the blob from a higher layer
as well, which is a tuple of (commit, deep/path) as the tree objects
involved are rather uninteresting.  The same blob can be referenced by
multiple commits, so how we decide which commit to use?  This patch
implements a rather naive approach on this: As there are no back pointers
from blobs to commits in which the blob occurs, we'll start walking from
any tips available, listing the blobs in-order of the commit and once we
found the blob, we'll take the first commit that listed the blob. For
example

  git describe --tags v0.99:Makefile
  conversion-901-g7672db20c2:Makefile

tells us the Makefile as it was in v0.99 was introduced in commit 7672db20.

The walking is performed in reverse order to show the introduction of a
blob rather than its last occurrence.

[1] https://stackoverflow.com/questions/223678/which-commit-has-this-blob

Signed-off-by: Stefan Beller <sbeller@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-12-19 11:17:16 -08:00
..
add.c Merge branch 'rj/add-chmod-error-message' into maint 2017-09-10 17:03:00 +09:00
am.c Merge branch 'pw/am-signoff' into maint 2017-09-10 17:02:51 +09:00
annotate.c
apply.c
archive.c archive: read local configuration 2016-11-22 13:55:20 -08:00
bisect--helper.c
blame.c Merge branch 'po/read-graft-line' 2017-09-06 13:11:25 +09:00
branch.c Merge branch 'jk/ref-filter-colors-fix' 2017-10-18 10:19:08 +09:00
bundle.c bundle: use prefix_filename with bundle path 2017-03-21 11:18:41 -07:00
cat-file.c Merge branch 'jk/fallthrough' 2017-09-28 14:47:53 +09:00
check-attr.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
check-ignore.c Merge branch 'bw/config-h' 2017-06-24 14:28:41 -07:00
check-mailmap.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
check-ref-format.c check-ref-format: release strbuf after use in check_ref_format_branch() 2017-09-07 08:49:26 +09:00
checkout-index.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
checkout.c Merge branch 'ma/builtin-unleak' 2017-10-07 16:27:55 +09:00
clean.c Merge branch 'jk/ref-filter-colors-fix' 2017-10-18 10:19:08 +09:00
clone.c Merge branch 'bw/clone-recursive-quiet' into maint 2017-09-10 17:02:49 +09:00
column.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
commit-tree.c Merge branch 'rk/commit-tree-make-F-verbatim' 2017-09-19 10:47:57 +09:00
commit.c Merge branch 'jk/no-optional-locks' 2017-10-03 15:42:49 +09:00
config.c add UNLEAK annotation for reducing leak false positives 2017-09-08 15:43:17 +09:00
count-objects.c pack: move open_pack_index(), parse_pack_index() 2017-08-23 15:12:06 -07:00
credential.c credential: handle invalid arguments earlier 2017-05-30 14:45:03 +09:00
describe.c builtin/describe.c: describe a blob 2017-12-19 11:17:16 -08:00
diff-files.c submodule: remove gitmodules_config 2017-08-03 13:11:02 -07:00
diff-index.c Merge branch 'ma/builtin-unleak' 2017-10-07 16:27:55 +09:00
diff-tree.c submodule: remove gitmodules_config 2017-08-03 13:11:02 -07:00
diff.c Merge branch 'ma/builtin-unleak' 2017-10-07 16:27:55 +09:00
difftool.c sha1_file: convert index_fd to struct object_id 2017-08-20 21:52:08 -07:00
fast-export.c Merge branch 'ma/leakplugs' 2017-09-29 11:23:43 +09:00
fetch-pack.c Rename sha1_array to oid_array 2017-03-31 08:33:56 -07:00
fetch.c Merge branch 'jt/packmigrate' 2017-08-26 22:55:09 -07:00
fmt-merge-msg.c Merge branch 'dc/fmt-merge-msg-microcleanup' into maint 2017-08-23 14:33:52 -07:00
for-each-ref.c provide --color option for all ref-filter users 2017-10-04 11:35:29 +09:00
fsck.c Merge branch 'ma/leakplugs' 2017-09-29 11:23:43 +09:00
gc.c Merge branch 'aw/gc-lockfile-fscanf-fix' 2017-09-25 15:24:09 +09:00
get-tar-commit-id.c distinguish error versus short read from read_in_full() 2017-09-27 15:45:24 +09:00
grep.c Merge branch 'jk/ref-filter-colors-fix' 2017-10-18 10:19:08 +09:00
hash-object.c sha1_file: convert hash_sha1_file_literally to struct object_id 2017-08-20 21:52:53 -07:00
help.c Merge branch 'ks/help-alias-label' 2017-09-25 15:24:07 +09:00
index-pack.c cleanup: fix possible overflow errors in binary search 2017-10-10 08:57:24 +09:00
init-db.c add UNLEAK annotation for reducing leak false positives 2017-09-08 15:43:17 +09:00
interpret-trailers.c Merge branch 'jk/trailers-parse' 2017-08-26 22:55:04 -07:00
log.c refs: pass NULL to resolve_ref_unsafe() if hash is not needed 2017-09-24 10:18:21 +09:00
ls-files.c add UNLEAK annotation for reducing leak false positives 2017-09-08 15:43:17 +09:00
ls-remote.c wildmatch: remove unused wildopts parameter 2017-06-23 18:27:07 -07:00
ls-tree.c Merge branch 'bw/config-h' 2017-06-24 14:28:41 -07:00
mailinfo.c prefix_filename: return newly allocated string 2017-03-21 11:18:41 -07:00
mailsplit.c mailinfo & mailsplit: check for EOF while parsing 2017-05-08 12:18:19 +09:00
merge-base.c Merge branch 'bw/config-h' 2017-06-24 14:28:41 -07:00
merge-file.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
merge-index.c Convert GIT_SHA1_HEXSZ used for allocation to GIT_MAX_HEXSZ 2017-03-26 22:08:21 -07:00
merge-ours.c
merge-recursive.c
merge-tree.c tree-walk: convert fill_tree_descriptor() to object_id 2017-08-14 12:38:54 -07:00
merge.c Merge branch 'rs/strbuf-leakfix' 2017-09-19 10:47:57 +09:00
mktag.c
mktree.c mktree: plug memory leaks reported by Coverity 2017-05-08 12:18:19 +09:00
mv.c submodule: remove gitmodules_config 2017-08-03 13:11:02 -07:00
name-rev.c Merge branch 'ma/builtin-unleak' 2017-10-07 16:27:55 +09:00
notes.c notes: release strbuf after use in notes_copy_from_stdin() 2017-09-07 08:49:28 +09:00
pack-objects.c cleanup: fix possible overflow errors in binary search 2017-10-10 08:57:24 +09:00
pack-redundant.c pack: move pack name-related functions 2017-08-23 15:12:06 -07:00
pack-refs.c refs: delete pack_refs() in favor of refs_pack_refs() 2017-04-14 03:53:25 -07:00
patch-id.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
prune-packed.c Merge branch 'jt/packmigrate' 2017-08-26 22:55:09 -07:00
prune.c progress: simplify "delayed" progress API 2017-08-19 14:01:34 -07:00
pull.c pull: honor submodule.recurse config option 2017-09-07 09:52:18 +09:00
push.c Merge branch 'ma/parse-maybe-bool' 2017-08-22 10:29:03 -07:00
read-tree.c submodule: remove gitmodules_config 2017-08-03 13:11:02 -07:00
rebase--helper.c rebase -i: rearrange fixup/squash lines using the rebase--helper 2017-07-27 15:35:06 -07:00
receive-pack.c Merge branch 'rs/resolve-ref-optional-result' 2017-10-05 13:48:19 +09:00
reflog.c object_array: add and use object_array_pop() 2017-09-24 10:06:04 +09:00
remote-ext.c consistently use "fallthrough" comments in switches 2017-09-22 12:49:57 +09:00
remote-fd.c remote-{ext,fd}: print usage message on invalid arguments 2017-05-30 14:45:04 +09:00
remote.c refs: pass NULL to resolve_ref_unsafe() if hash is not needed 2017-09-24 10:18:21 +09:00
repack.c Merge branch 'bw/config-h' 2017-06-24 14:28:41 -07:00
replace.c sha1_file: convert index_fd to struct object_id 2017-08-20 21:52:08 -07:00
rerere.c avoid "write_in_full(fd, buf, len) != len" pattern 2017-09-14 15:17:59 +09:00
reset.c Merge branch 'jk/leak-checkers' 2017-09-19 10:47:55 +09:00
rev-list.c Merge branch 'jk/rev-list-empty-input' into maint 2017-09-10 17:02:48 +09:00
rev-parse.c Merge branch 'bc/rev-parse-parseopt-fix' 2017-10-03 15:42:47 +09:00
revert.c cherry-pick/revert: reject --rerere-autoupdate when continuing 2017-08-02 15:16:09 -07:00
rm.c submodule: remove gitmodules_config 2017-08-03 13:11:02 -07:00
send-pack.c Merge branch 'ma/parse-maybe-bool' 2017-08-22 10:29:03 -07:00
shortlog.c shortlog: skip format/parse roundtrip for internal traversal 2017-09-09 01:57:03 +09:00
show-branch.c Merge branch 'jk/ref-filter-colors-fix' 2017-10-18 10:19:08 +09:00
show-ref.c show-ref: remove a stale comment 2017-01-23 18:51:56 -08:00
stripspace.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
submodule--helper.c Merge branch 'rs/resolve-ref-optional-result' 2017-09-28 14:47:56 +09:00
symbolic-ref.c refs: pass NULL to resolve_ref_unsafe() if hash is not needed 2017-09-24 10:18:21 +09:00
tag.c Merge branch 'jk/ref-filter-colors-fix' 2017-10-18 10:19:08 +09:00
unpack-file.c Merge branch 'jk/write-in-full-fix' 2017-09-25 15:24:06 +09:00
unpack-objects.c cleanup: fix possible overflow errors in binary search 2017-10-10 08:57:24 +09:00
update-index.c Merge branch 'jk/leak-checkers' 2017-09-19 10:47:55 +09:00
update-ref.c builtin/update_ref: convert to struct object_id 2017-07-17 13:54:38 -07:00
update-server-info.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
upload-archive.c upload-archive: handle "-h" option early 2017-05-30 14:45:04 +09:00
var.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
verify-commit.c Merge branch 'bw/config-h' 2017-06-24 14:28:41 -07:00
verify-pack.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00
verify-tag.c Merge branch 'jk/ref-filter-colors' 2017-08-11 13:26:58 -07:00
worktree.c worktree: check the result of read_in_full() 2017-09-27 15:46:05 +09:00
write-tree.c config: don't include config.h by default 2017-06-15 12:56:22 -07:00