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authorJeff King <peff@peff.net>2014-02-27 11:25:20 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-02-27 20:07:13 (GMT)
commit0179c945fce361c56b465e8a3f0fdf0962a816a1 (patch)
tree714556b0cbd64a39b374adc71484bc3e4e4a5a05
parent0cc77c386cea7afebb54a5e7263ca37569ecfe7a (diff)
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shallow: automatically clean up shallow tempfiles
We sometimes write tempfiles of the form "shallow_XXXXXX" during fetch/push operations with shallow repositories. Under normal circumstances, we clean up the result when we are done. However, we do no take steps to clean up after ourselves when we exit due to die() or signal death. This patch teaches the tempfile creation code to register handlers to clean up after ourselves. To handle this, we change the ownership semantics of the filename returned by setup_temporary_shallow. It now keeps a copy of the filename itself, and returns only a const pointer to it. We can also do away with explicit tempfile removal in the callers. They all exit not long after finishing with the file, so they can rely on the auto-cleanup, simplifying the code. Note that we keep things simple and maintain only a single filename to be cleaned. This is sufficient for the current caller, but we future-proof it with a die("BUG"). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/receive-pack.c16
-rw-r--r--commit.h2
-rw-r--r--fetch-pack.c11
-rw-r--r--shallow.c41
-rw-r--r--upload-pack.c7
5 files changed, 40 insertions, 37 deletions
diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c
index 85bba35..c323081 100644
--- a/builtin/receive-pack.c
+++ b/builtin/receive-pack.c
@@ -828,14 +828,10 @@ static void execute_commands(struct command *commands,
}
}
- if (shallow_update) {
- if (!checked_connectivity)
- error("BUG: run 'git fsck' for safety.\n"
- "If there are errors, try to remove "
- "the reported refs above");
- if (alt_shallow_file && *alt_shallow_file)
- unlink(alt_shallow_file);
- }
+ if (shallow_update && !checked_connectivity)
+ error("BUG: run 'git fsck' for safety.\n"
+ "If there are errors, try to remove "
+ "the reported refs above");
}
static struct command *read_head_info(struct sha1_array *shallow)
@@ -1087,10 +1083,6 @@ static void update_shallow_info(struct command *commands,
cmd->skip_update = 1;
}
}
- if (alt_shallow_file && *alt_shallow_file) {
- unlink(alt_shallow_file);
- alt_shallow_file = NULL;
- }
free(ref_status);
}
diff --git a/commit.h b/commit.h
index 16d9c43..55631f1 100644
--- a/commit.h
+++ b/commit.h
@@ -209,7 +209,7 @@ extern int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
extern void setup_alternate_shallow(struct lock_file *shallow_lock,
const char **alternate_shallow_file,
const struct sha1_array *extra);
-extern char *setup_temporary_shallow(const struct sha1_array *extra);
+extern const char *setup_temporary_shallow(const struct sha1_array *extra);
extern void advertise_shallow_grafts(int);
struct shallow_info {
diff --git a/fetch-pack.c b/fetch-pack.c
index 90fdd49..ae8550e 100644
--- a/fetch-pack.c
+++ b/fetch-pack.c
@@ -947,17 +947,6 @@ static void update_shallow(struct fetch_pack_args *args,
if (!si->shallow || !si->shallow->nr)
return;
- if (alternate_shallow_file) {
- /*
- * The temporary shallow file is only useful for
- * index-pack and unpack-objects because it may
- * contain more roots than we want. Delete it.
- */
- if (*alternate_shallow_file)
- unlink(alternate_shallow_file);
- free((char *)alternate_shallow_file);
- }
-
if (args->cloning) {
/*
* remote is shallow, but this is a clone, there are
diff --git a/shallow.c b/shallow.c
index 1a6f022..c7602ce 100644
--- a/shallow.c
+++ b/shallow.c
@@ -8,6 +8,7 @@
#include "diff.h"
#include "revision.h"
#include "commit-slab.h"
+#include "sigchain.h"
static int is_shallow = -1;
static struct stat_validity shallow_stat;
@@ -206,27 +207,53 @@ int write_shallow_commits(struct strbuf *out, int use_pack_protocol,
return write_shallow_commits_1(out, use_pack_protocol, extra, 0);
}
-char *setup_temporary_shallow(const struct sha1_array *extra)
+static struct strbuf temporary_shallow = STRBUF_INIT;
+
+static void remove_temporary_shallow(void)
+{
+ if (temporary_shallow.len) {
+ unlink_or_warn(temporary_shallow.buf);
+ strbuf_reset(&temporary_shallow);
+ }
+}
+
+static void remove_temporary_shallow_on_signal(int signo)
+{
+ remove_temporary_shallow();
+ sigchain_pop(signo);
+ raise(signo);
+}
+
+const char *setup_temporary_shallow(const struct sha1_array *extra)
{
+ static int installed_handler;
struct strbuf sb = STRBUF_INIT;
int fd;
+ if (temporary_shallow.len)
+ die("BUG: attempt to create two temporary shallow files");
+
if (write_shallow_commits(&sb, 0, extra)) {
- struct strbuf path = STRBUF_INIT;
- strbuf_addstr(&path, git_path("shallow_XXXXXX"));
- fd = xmkstemp(path.buf);
+ strbuf_addstr(&temporary_shallow, git_path("shallow_XXXXXX"));
+ fd = xmkstemp(temporary_shallow.buf);
+
+ if (!installed_handler) {
+ atexit(remove_temporary_shallow);
+ sigchain_push_common(remove_temporary_shallow_on_signal);
+ }
+
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
- path.buf);
+ temporary_shallow.buf);
close(fd);
strbuf_release(&sb);
- return strbuf_detach(&path, NULL);
+ return temporary_shallow.buf;
}
/*
* is_repository_shallow() sees empty string as "no shallow
* file".
*/
- return xstrdup("");
+ return temporary_shallow.buf;
}
void setup_alternate_shallow(struct lock_file *shallow_lock,
diff --git a/upload-pack.c b/upload-pack.c
index 0c44f6b..a3c52f6 100644
--- a/upload-pack.c
+++ b/upload-pack.c
@@ -81,7 +81,7 @@ static void create_pack_file(void)
const char *argv[12];
int i, arg = 0;
FILE *pipe_fd;
- char *shallow_file = NULL;
+ const char *shallow_file = NULL;
if (shallow_nr) {
shallow_file = setup_temporary_shallow(NULL);
@@ -242,11 +242,6 @@ static void create_pack_file(void)
error("git upload-pack: git-pack-objects died with error.");
goto fail;
}
- if (shallow_file) {
- if (*shallow_file)
- unlink(shallow_file);
- free(shallow_file);
- }
/* flush the data */
if (0 <= buffered) {