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David Aguilar 5bafb3576a difftool: fix symlink-file writing in dir-diff mode 
The difftool dir-diff mode handles symlinks by replacing them with their
readlink(2) values. This allows diff tools to see changes to symlinks
as if they were regular text diffs with the old and new path values.
This is analogous to what "git diff" displays when symlinks change.

The temporary diff directories that are created initially contain
symlinks because they get checked-out using a temporary index that
retains the original symlinks as checked-in to the repository.

A bug was introduced when difftool was rewritten in C that made
difftool write the readlink(2) contents into the pointed-to file rather
than the symlink itself. The write was going through the symlink and
writing to its target rather than writing to the symlink path itself.

Replace symlinks with raw text files by unlinking the symlink path
before writing the readlink(2) content into them.

When 18ec800512 (difftool: handle modified symlinks in dir-diff mode,
2017-03-15) added handling for modified symlinks this bug got recorded
in the test suite. The tests included the pointed-to symlink target
paths. These paths were being reported because difftool was erroneously
writing to them, but they should have never been reported nor written.

Correct the modified-symlinks test cases by removing the target files
from the expected output.

Add a test to ensure that symlinks are written with the readlink(2)
values and that the target files contain their original content.

Reported-by: Alan Blotz <work@blotz.org>
Helped-by: Đoàn Trần Công Danh <congdanhqx@gmail.com>
Signed-off-by: David Aguilar <davvid@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
2021-09-23 11:24:41 -07:00
..
add.c Merge branch 'ow/no-dryrun-in-add-i' 2021-05-14 08:26:09 +09:00
am.c am: learn to process quoted lines that ends with CRLF 2021-05-10 15:06:22 +09:00
annotate.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
apply.c
archive.c
bisect--helper.c bisect--helper: use BISECT_TERMS in 'bisect skip' command 2021-04-30 09:56:42 +09:00
blame.c Merge branch 'rs/blame-optim' 2021-02-25 16:43:29 -08:00
branch.c ref-filter: reuse output buffer 2021-04-20 11:09:50 -07:00
bugreport.c builtin/bugreport: don't leak prefixed filename 2021-04-28 09:25:45 +09:00
bundle.c Merge branch 'bc/sha-256-part-3' 2020-08-11 18:04:11 -07:00
cat-file.c Merge branch 'cc/cat-file-usage-update' into master 2020-07-09 14:00:41 -07:00
check-attr.c
check-ignore.c Merge branch 'ah/plugleaks' 2021-05-07 12:47:41 +09:00
check-mailmap.c shortlog: remove unused(?) "repo-abbrev" feature 2021-01-12 14:04:42 -08:00
check-ref-format.c
checkout--worker.c make_transient_cache_entry(): optionally alloc from mem_pool 2021-05-05 12:25:25 +09:00
checkout-index.c Merge branch 'mt/parallel-checkout-part-3' 2021-05-16 21:05:23 +09:00
checkout.c Merge branch 'mt/parallel-checkout-part-3' 2021-05-16 21:05:23 +09:00
clean.c Merge branch 'en/dir-traversal' 2021-05-20 08:54:59 +09:00
clone.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
column.c column, range-diff: downcase option description 2021-03-29 14:06:08 -07:00
commit-graph.c builtin/*: update usage format 2021-01-06 15:10:49 -08:00
commit-tree.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
commit.c Merge branch 'ds/sparse-index-protections' 2021-04-30 13:50:26 +09:00
config.c config: unify code paths to get global config paths 2021-04-19 14:16:59 -07:00
count-objects.c
credential-cache--daemon.c unix-socket: add backlog size option to unix_stream_listen() 2021-03-15 14:32:51 -07:00
credential-cache.c unix-socket: disallow chdir() when creating unix domain sockets 2021-03-15 14:32:51 -07:00
credential-store.c crendential-store: use timeout when locking file 2020-11-25 12:30:18 -08:00
credential.c credential: load default config 2020-10-16 12:30:45 -07:00
describe.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
diff-files.c Merge branch 'jc/diffcore-rotate' 2021-02-25 16:43:30 -08:00
diff-index.c Merge branch 'jc/diffcore-rotate' 2021-02-25 16:43:30 -08:00
diff-tree.c Merge branch 'jc/diffcore-rotate' 2021-02-25 16:43:30 -08:00
diff.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
difftool.c difftool: fix symlink-file writing in dir-diff mode 2021-09-23 11:24:41 -07:00
env--helper.c assert PARSE_OPT_NONEG in parse-options callbacks 2020-09-30 12:53:47 -07:00
fast-export.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
fast-import.c Use the final_oid_fn to finalize hashing of object IDs 2021-04-27 16:31:38 +09:00
fetch-pack.c connect, transport: encapsulate arg in struct 2021-02-05 13:49:54 -08:00
fetch.c Merge branch 'jt/push-negotiation' 2021-05-16 21:05:22 +09:00
fmt-merge-msg.c Lib-ify fmt-merge-msg 2020-03-24 15:04:43 -07:00
for-each-ref.c Merge branch 'ah/plugleaks' 2021-05-07 12:47:41 +09:00
for-each-repo.c for-each-repo: do nothing on empty config 2021-01-07 19:12:02 -08:00
fsck.c Merge branch 'ab/fsck-api-cleanup' 2021-06-02 07:34:27 +09:00
gc.c maintenance: fix two memory leaks 2021-05-12 07:00:45 +09:00
get-tar-commit-id.c
grep.c Merge branch 'bc/hash-transition-interop-part-1' 2021-05-10 16:59:46 +09:00
hash-object.c
help.c help: drop usage of 'common' and 'useful' for guides 2020-08-04 18:34:01 -07:00
index-pack.c Use the final_oid_fn to finalize hashing of object IDs 2021-04-27 16:31:38 +09:00
init-db.c Merge branch 'mt/init-template-userpath-fix' 2021-05-25 16:21:20 +09:00
interpret-trailers.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
log.c Merge branch 'so/log-diff-merge' 2021-04-30 13:50:26 +09:00
ls-files.c Merge branch 'en/dir-traversal' 2021-05-20 08:54:59 +09:00
ls-remote.c Merge branch 'ah/plugleaks' 2021-04-07 16:54:08 -07:00
ls-tree.c tree.h API: simplify read_tree_recursive() signature 2021-03-20 16:09:26 -07:00
mailinfo.c mailinfo: allow squelching quoted CRLF warning 2021-05-10 15:06:22 +09:00
mailsplit.c
merge-base.c
merge-file.c
merge-index.c merge-index: ensure full index 2021-04-14 13:47:21 -07:00
merge-ours.c
merge-recursive.c
merge-tree.c merge-base, xdiff: zero out xpparam_t structures 2020-10-20 12:53:26 -07:00
merge.c merge: fix swapped "up to date" message components 2021-05-03 14:14:58 +09:00
mktag.c fsck.c: add an fsck_set_msg_type() API that takes enums 2021-03-28 19:03:10 -07:00
mktree.c
multi-pack-index.c midx: allow marking a pack as preferred 2021-04-01 13:07:37 -07:00
mv.c git mv foo FOO ; git mv foo bar gave an assert 2021-03-03 17:07:12 -08:00
name-rev.c oid_pos(): access table through const pointers 2021-01-28 12:03:26 -08:00
notes.c use CALLOC_ARRAY 2021-03-13 16:00:09 -08:00
pack-objects.c Merge branch 'ab/pack-linkage-fix' 2021-05-27 12:36:58 +09:00
pack-redundant.c builtin/pack-redundant: avoid casting buffers to struct object_id 2021-04-27 16:31:38 +09:00
pack-refs.c
patch-id.c
prune-packed.c Lib-ify prune-packed 2020-03-24 15:04:44 -07:00
prune.c Merge branch 'tb/shallow-cleanup' 2020-05-13 12:19:18 -07:00
pull.c pull: display default warning only when non-ff 2020-12-15 17:39:42 -08:00
push.c Merge branch 'jc/push-delete-nothing' 2021-02-25 16:43:33 -08:00
range-diff.c column, range-diff: downcase option description 2021-03-29 14:06:08 -07:00
read-tree.c Use OPT_CALLBACK and OPT_CALLBACK_F 2020-04-28 10:47:10 -07:00
rebase.c Merge branch 'bc/hash-transition-interop-part-1' 2021-05-10 16:59:46 +09:00
receive-pack.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
reflog.c reflog expire --stale-fix: be generous about missing objects 2021-02-11 09:21:52 -08:00
remote-ext.c strvec: convert builtin/ callers away from argv_array name 2020-07-28 15:02:18 -07:00
remote-fd.c
remote.c Merge branch 'ah/plugleaks' 2021-04-07 16:54:08 -07:00
repack.c repack: avoid loosening promisor objects in partial clones 2021-04-28 13:36:13 +09:00
replace.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
rerere.c
reset.c reset: free instead of leaking unneeded ref 2021-03-14 15:57:59 -07:00
rev-list.c rev-list: allow filtering of provided items 2021-04-19 14:09:11 -07:00
rev-parse.c rev-parse: fix segfault with missing --path-format argument 2021-05-17 18:39:29 +09:00
revert.c sequencer: fix edit handling for cherry-pick and revert messages 2021-03-31 14:10:50 -07:00
rm.c Merge branch 'ah/plugleaks' 2021-05-07 12:47:41 +09:00
send-pack.c push: parse and set flag for "--force-if-includes" 2020-10-03 09:59:19 -07:00
shortlog.c Merge branch 'ab/mailmap' 2021-01-25 14:19:19 -08:00
show-branch.c Merge branch 'jt/interpret-branch-name-fallback' 2020-09-09 13:53:09 -07:00
show-index.c builtin/show-index: set the algorithm for object IDs 2021-04-27 16:31:39 +09:00
show-ref.c refs: switch peel_ref() to peel_iterated_oid() 2021-01-21 15:51:31 -08:00
sparse-checkout.c Merge branch 'ds/sparse-index-protections' 2021-04-30 13:50:26 +09:00
stash.c Merge branch 'dl/stash-show-untracked-fixup' 2021-05-22 18:29:01 +09:00
stripspace.c
submodule--helper.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
symbolic-ref.c symbolic-ref: don't leak shortened refname in check_symref() 2021-03-14 15:57:59 -07:00
tag.c ref-filter: reuse output buffer 2021-04-20 11:09:50 -07:00
unpack-file.c
unpack-objects.c hash: provide per-algorithm null OIDs 2021-04-27 16:31:39 +09:00
update-index.c update-index: ensure full index 2021-04-14 13:47:29 -07:00
update-ref.c update-ref: disallow "start" for ongoing transactions 2020-11-16 13:44:01 -08:00
update-server-info.c
upload-archive.c strvec: rename struct fields 2020-07-30 19:18:06 -07:00
upload-pack.c
var.c
verify-commit.c
verify-pack.c Merge branch 'bc/sha-256-part-3' 2020-08-11 18:04:11 -07:00
verify-tag.c
worktree.c Merge branch 'en/dir-traversal' 2021-05-20 08:54:59 +09:00
write-tree.c