This wires the in-repo-symlink following code through to the cat-file
builtin. In the event of an out-of-repo link, cat-file will print
the link in a new format.
Signed-off-by: David Turner <dtur...@twopensource.com>
---
Documentation/git-cat-file.txt | 99 +++++++++++++++++++-
builtin/cat-file.c | 51 ++++++++--
t/t1006-cat-file.sh | 205 +++++++++++++++++++++++++++++++++++++++++
3 files changed, 348 insertions(+), 7 deletions(-)
diff --git a/Documentation/git-cat-file.txt b/Documentation/git-cat-file.txt
index f6a16f4..3568aff 100644
--- a/Documentation/git-cat-file.txt
+++ b/Documentation/git-cat-file.txt
@@ -10,7 +10,7 @@ SYNOPSIS
--------
[verse]
'git cat-file' (-t | -s | -e | -p | <type> | --textconv ) <object>
-'git cat-file' (--batch | --batch-check) < <list-of-objects>
+'git cat-file' (--batch | --batch-check) [--follow-symlinks] <
<list-of-objects>
DESCRIPTION
-----------
@@ -69,6 +69,62 @@ OPTIONS
not be combined with any other options or arguments. See the
section `BATCH OUTPUT` below for details.
+--follow-symlinks::
+ With --batch or --batch-check, follow symlinks inside the
+ repository when requesting objects with extended SHA-1
+ expressions of the form tree-ish:path-in-tree. Instead of
+ providing output about the link itself, provide output about
+ the linked-to object. If a symlink points outside the
+ tree-ish (e.g. a link to /foo or a root-level link to ../foo),
+ the portion of the link which is outside the tree will be
+ printed.
++
+This option does not (currently) work correctly when an object in the
+index is specified (e.g. `:link` instead of `HEAD:link`) rather than
+one in the tree.
++
+This option cannot (currently) be used unless `--batch` or
+`--batch-check` is used.
++
+For example, consider a git repository containing:
++
+--
+ f: a file containing "hello\n"
+ link: a symlink to f
+ dir/link: a symlink to ../f
+ plink: a symlink to ../f
+ alink: a symlink to /etc/passwd
+--
++
+For a regular file `f`, `echo HEAD:f | git cat-file --batch` would print
++
+--
+ ce013625030ba8dba906f756967f9e9ca394464a blob 6
+--
++
+And `echo HEAD:link | git cat-file --batch --follow-symlinks` would
+print the same thing, as would `HEAD:dir/link`, as they both point at
+`HEAD:f`.
++
+Without `--follow-symlinks`, these would print data about the symlink
+itself. In the case of `HEAD:link`, you would see
++
+--
+ 4d1ae35ba2c8ec712fa2a379db44ad639ca277bd blob 1
+--
++
+Both `plink` and `alink` point outside the tree, so they would
+respectively print:
++
+--
+ symlink 4
+ ../f
+
+ symlink 11
+ /etc/passwd
+--
+
+
OUTPUT
------
If '-t' is specified, one of the <type>.
@@ -148,6 +204,47 @@ the repository, then `cat-file` will ignore any custom
format and print:
<object> SP missing LF
------------
+If --follow-symlinks is used, and a symlink in the repository points
+outside the repository, then `cat-file` will ignore any custom format
+and print:
+
+------------
+symlink SP <size> LF
+<symlink> LF
+------------
+
+The symlink will either be absolute (beginning with a /), or relative
+to the tree root. For instance, if dir/link points to ../../foo, then
+<symlink> will be ../foo. <size> is the size of the symlink in bytes.
+
+If --follow-symlinks is used, the following error messages will be
+displayed:
+
+------------
+<object> SP missing LF
+------------
+is printed when the initial symlink requested does not exist.
+
+------------
+dangling SP <size> LF
+<object> LF
+------------
+is printed when the initial symlink exists, but something that
+it (transitive-of) points to does not.
+
+------------
+loop SP <size> LF
+<object> LF
+------------
+is printed for symlink loops (or any symlinks that
+require more than 40 link resolutions to resolve).
+
+------------
+notdir SP <size> LF
+<object> LF
+------------
+is printed when, during symlink resolution, a file is used as a
+directory name.
CAVEATS
-------
diff --git a/builtin/cat-file.c b/builtin/cat-file.c
index df99df4..43338bb 100644
--- a/builtin/cat-file.c
+++ b/builtin/cat-file.c
@@ -8,6 +8,7 @@
#include "parse-options.h"
#include "userdiff.h"
#include "streaming.h"
+#include "tree-walk.h"
static int cat_one_file(int opt, const char *exp_type, const char *obj_name)
{
@@ -224,6 +225,7 @@ static void print_object_or_die(int fd, struct expand_data
*data)
struct batch_options {
int enabled;
+ int follow_symlinks;
int print_contents;
const char *format;
};
@@ -232,12 +234,44 @@ static int batch_one_object(const char *obj_name, struct
batch_options *opt,
struct expand_data *data)
{
struct strbuf buf = STRBUF_INIT;
+ struct object_context ctx;
+ int flags = opt->follow_symlinks ? GET_SHA1_FOLLOW_SYMLINKS : 0;
+ enum follow_symlinks_result result;
if (!obj_name)
return 1;
- if (get_sha1(obj_name, data->sha1)) {
- printf("%s missing\n", obj_name);
+ result = get_sha1_with_context(obj_name, flags, data->sha1, &ctx);
+ if (result != FOUND) {
+ switch (result) {
+ case MISSING_OBJECT:
+ printf("%s missing\n", obj_name);
+ break;
+ case DANGLING_SYMLINK:
+ printf("dangling %"PRIuMAX"\n%s\n",
+ (uintmax_t)strlen(obj_name), obj_name);
+ break;
+ case SYMLINK_LOOP:
+ printf("loop %"PRIuMAX"\n%s\n",
+ (uintmax_t)strlen(obj_name), obj_name);
+ break;
+ case NOT_DIR:
+ printf("notdir %"PRIuMAX"\n%s\n",
+ (uintmax_t)strlen(obj_name), obj_name);
+ break;
+ default:
+ die("BUG: unknown get_sha1_with_context result %d\n",
+ result);
+ break;
+ }
+ fflush(stdout);
+ return 0;
+ }
+
+ if (ctx.mode == 0) {
+ printf("symlink %"PRIuMAX"\n%s\n",
+ (uintmax_t)ctx.symlink_path.len,
+ ctx.symlink_path.buf);
fflush(stdout);
return 0;
}
@@ -324,7 +358,7 @@ static int batch_objects(struct batch_options *opt)
static const char * const cat_file_usage[] = {
N_("git cat-file (-t | -s | -e | -p | <type> | --textconv) <object>"),
- N_("git cat-file (--batch | --batch-check) < <list-of-objects>"),
+ N_("git cat-file (--batch | --batch-check) [--follow-symlinks] <
<list-of-objects>"),
NULL
};
@@ -342,9 +376,8 @@ static int batch_option_callback(const struct option *opt,
{
struct batch_options *bo = opt->value;
- if (unset) {
- memset(bo, 0, sizeof(*bo));
- return 0;
+ if (bo->enabled) {
+ return 1;
}
bo->enabled = 1;
@@ -375,6 +408,8 @@ int cmd_cat_file(int argc, const char **argv, const char
*prefix)
{ OPTION_CALLBACK, 0, "batch-check", &batch, "format",
N_("show info about objects fed from the standard
input"),
PARSE_OPT_OPTARG, batch_option_callback },
+ OPT_BOOL(0, "follow-symlinks", &batch.follow_symlinks,
+ N_("follow in-tree symlinks (used with --batch or
--batch-check)")),
OPT_END()
};
@@ -402,6 +437,10 @@ int cmd_cat_file(int argc, const char **argv, const char
*prefix)
usage_with_options(cat_file_usage, options);
}
+ if (batch.follow_symlinks && !batch.enabled) {
+ usage_with_options(cat_file_usage, options);
+ }
+
if (batch.enabled)
return batch_objects(&batch);
diff --git a/t/t1006-cat-file.sh b/t/t1006-cat-file.sh
index ab36b1e..a494013 100755
--- a/t/t1006-cat-file.sh
+++ b/t/t1006-cat-file.sh
@@ -189,6 +189,13 @@ do
'
done
+for opt in t s e p
+do
+ test_expect_success "Passing -$opt with --follow-symlinks fails" '
+ test_must_fail git cat-file --follow-symlinks -$opt $hello_sha1
+ '
+done
+
test_expect_success "--batch-check for a non-existent named object" '
test "foobar42 missing
foobar84 missing" = \
@@ -296,4 +303,202 @@ test_expect_success '%(deltabase) reports packed delta
bases' '
}
'
+# Tests for git cat-file --follow-symlinks
+test_expect_success 'prep for symlink tests' '
+ echo_without_newline "$hello_content" >morx &&
+ test_ln_s_add morx same-dir-link &&
+ test_ln_s_add dir link-to-dir &&
+ test_ln_s_add ../fleem out-of-repo-link &&
+ test_ln_s_add .. out-of-repo-link-dir &&
+ test_ln_s_add same-dir-link link-to-link &&
+ test_ln_s_add nope broken-same-dir-link &&
+ mkdir dir &&
+ test_ln_s_add ../morx dir/parent-dir-link &&
+ test_ln_s_add .. dir/link-dir &&
+ test_ln_s_add ../../escape dir/out-of-repo-link &&
+ test_ln_s_add ../.. dir/out-of-repo-link-dir &&
+ test_ln_s_add nope dir/broken-link-in-dir &&
+ mkdir dir/subdir &&
+ test_ln_s_add ../../morx dir/subdir/grandparent-dir-link &&
+ test_ln_s_add ../../../great-escape dir/subdir/out-of-repo-link &&
+ test_ln_s_add ../../.. dir/subdir/out-of-repo-link-dir &&
+ test_ln_s_add ../../../ dir/subdir/out-of-repo-link-dir-trailing &&
+ test_ln_s_add ../parent-dir-link dir/subdir/parent-dir-link-to-link &&
+ echo_without_newline "$hello_content" >dir/subdir/ind2 &&
+ echo_without_newline "$hello_content" >dir/ind1 &&
+ test_ln_s_add dir dirlink &&
+ test_ln_s_add dir/subdir subdirlink &&
+ test_ln_s_add subdir/ind2 dir/link-to-child &&
+ test_ln_s_add dir/link-to-child link-to-down-link &&
+ test_ln_s_add dir/.. up-down &&
+ test_ln_s_add dir/../ up-down-trailing &&
+ test_ln_s_add dir/../morx up-down-file &&
+ test_ln_s_add dir/../../morx up-up-down-file &&
+ test_ln_s_add subdirlink/../../morx up-two-down-file &&
+ test_ln_s_add loop1 loop2 &&
+ test_ln_s_add loop2 loop1 &&
+ git add morx dir/subdir/ind2 dir/ind1 &&
+ git commit -am "test" &&
+ echo $hello_sha1 blob $hello_size >found
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
non-links' '
+ echo HEAD:morx | git cat-file --batch-check --follow-symlinks >actual &&
+ test_cmp found actual &&
+ echo HEAD:nope missing >expect &&
+ echo HEAD:nope | git cat-file --batch-check --follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
in-repo, same-dir links' '
+ echo HEAD:same-dir-link | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
in-repo, links to dirs' '
+ echo HEAD:link-to-dir/ind1 | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual
+'
+
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
broken in-repo, same-dir links' '
+ echo dangling 25 >expect &&
+ echo HEAD:broken-same-dir-link >>expect &&
+ echo HEAD:broken-same-dir-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
same-dir links-to-links' '
+ echo HEAD:link-to-link | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
parent-dir links' '
+ echo HEAD:dir/parent-dir-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual &&
+ echo notdir 29 >expect &&
+ echo HEAD:dir/parent-dir-link/nope >>expect &&
+ echo HEAD:dir/parent-dir-link/nope | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for ..
links' '
+ echo dangling 22 >expect &&
+ echo HEAD:dir/link-dir/nope >>expect &&
+ echo HEAD:dir/link-dir/nope | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:dir/link-dir/morx | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual &&
+ echo dangling 27 >expect &&
+ echo HEAD:dir/broken-link-in-dir >>expect &&
+ echo HEAD:dir/broken-link-in-dir | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
../.. links' '
+ echo notdir 41 >expect &&
+ echo HEAD:dir/subdir/grandparent-dir-link/nope >>expect &&
+ echo HEAD:dir/subdir/grandparent-dir-link/nope | git cat-file
--batch-check --follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:dir/subdir/grandparent-dir-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual &&
+ echo HEAD:dir/subdir/parent-dir-link-to-link | git cat-file
--batch-check --follow-symlinks >actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
dir/ links' '
+ echo dangling 17 >expect &&
+ echo HEAD:dirlink/morx >>expect &&
+ echo HEAD:dirlink/morx | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp expect actual &&
+ echo $hello_sha1 blob $hello_size >expect &&
+ echo HEAD:dirlink/ind1 | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
dir/subdir links' '
+ echo dangling 20 >expect &&
+ echo HEAD:subdirlink/morx >>expect &&
+ echo HEAD:subdirlink/morx | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:subdirlink/ind2 | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
dir ->subdir links' '
+ echo notdir 27 >expect &&
+ echo HEAD:dir/link-to-child/morx >>expect &&
+ echo HEAD:dir/link-to-child/morx | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:dir/link-to-child | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual &&
+ echo HEAD:link-to-down-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
out-of-repo symlinks' '
+ echo symlink 8 >expect &&
+ echo ../fleem >>expect &&
+ echo HEAD:out-of-repo-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo symlink 2 >expect &&
+ echo .. >>expect &&
+ echo HEAD:out-of-repo-link-dir | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
out-of-repo symlinks in dirs' '
+ echo symlink 9 >expect &&
+ echo ../escape >>expect &&
+ echo HEAD:dir/out-of-repo-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo symlink 2 >expect &&
+ echo .. >>expect &&
+ echo HEAD:dir/out-of-repo-link-dir | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
out-of-repo symlinks in subdirs' '
+ echo symlink 15 >expect &&
+ echo ../great-escape >>expect &&
+ echo HEAD:dir/subdir/out-of-repo-link | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo symlink 2 >expect &&
+ echo .. >>expect &&
+ echo HEAD:dir/subdir/out-of-repo-link-dir | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo symlink 3 >expect &&
+ echo ../ >>expect &&
+ echo HEAD:dir/subdir/out-of-repo-link-dir-trailing | git cat-file
--batch-check --follow-symlinks >actual &&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlinks works for
symlinks with internal ..' '
+ echo HEAD: | git cat-file --batch-check >expect &&
+ echo HEAD:up-down | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp expect actual &&
+ echo HEAD:up-down-trailing | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:up-down-file | git cat-file --batch-check --follow-symlinks
>actual &&
+ test_cmp found actual &&
+ echo symlink 7 >expect &&
+ echo ../morx >>expect &&
+ echo HEAD:up-up-down-file | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp expect actual &&
+ echo HEAD:up-two-down-file | git cat-file --batch-check
--follow-symlinks >actual &&
+ test_cmp found actual
+'
+
+test_expect_success 'git cat-file --batch-check --follow-symlink breaks loops'
'
+ echo loop 10 >expect &&
+ echo HEAD:loop1 >>expect &&
+ echo HEAD:loop1 | git cat-file --batch-check --follow-symlinks >actual
&&
+ test_cmp expect actual
+'
+
+test_expect_success 'git cat-file --batch --follow-symlink returns correct sha
and mode' '
+ echo HEAD:morx | git cat-file --batch >expect &&
+ echo HEAD:morx | git cat-file --batch --follow-symlinks >actual &&
+ test_cmp expect actual
+'
test_done
--
2.0.4.315.gad8727a-twtrsrc
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