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2b2999460c
cmd_for_each_repo() copies argv into args (a strvec), which is later
passed into run_command_on_repo(), which in turn copies that strvec onto
the end of child.args. The initial copy is unnecessary (we never modify
args). We therefore choose to just pass argv directly into
run_command_on_repo(), which lets us avoid the copy and fixes the leak.
LSAN output from t0068:
Direct leak of 192 byte(s) in 1 object(s) allocated from:
#0 0x7f63bd4ab8b0 in realloc (/usr/lib64/libasan.so.4+0xdc8b0)
#1 0x98d7e6 in xrealloc wrapper.c:126
#2 0x916914 in strvec_push_nodup strvec.c:19
#3 0x916a6e in strvec_push strvec.c:26
#4 0x4be4eb in cmd_for_each_repo builtin/for-each-repo.c:49
#5 0x410dcd in run_builtin git.c:475
#6 0x410dcd in handle_builtin git.c:729
#7 0x414087 in run_argv git.c:818
#8 0x414087 in cmd_main git.c:949
#9 0x40e9ec in main common-main.c:52
#10 0x7f63bc9fa349 in __libc_start_main (/lib64/libc.so.6+0x24349)
Indirect leak of 22 byte(s) in 2 object(s) allocated from:
#0 0x7f63bd445e30 in __interceptor_strdup (/usr/lib64/libasan.so.4+0x76e30)
#1 0x98d698 in xstrdup wrapper.c:29
#2 0x916a63 in strvec_push strvec.c:26
#3 0x4be4eb in cmd_for_each_repo builtin/for-each-repo.c:49
#4 0x410dcd in run_builtin git.c:475
#5 0x410dcd in handle_builtin git.c:729
#6 0x414087 in run_argv git.c:818
#7 0x414087 in cmd_main git.c:949
#8 0x40e9ec in main common-main.c:52
#9 0x7f63bc9fa349 in __libc_start_main (/lib64/libc.so.6+0x24349)
See also discussion about the original implementation below - this code
appears to have evolved from a callback explaining the double-strvec-copy
pattern, but there's no strong reason to keep that now:
https://lore.kernel.org/git/68bbeca5-314b-08ee-ef36-040e3f3814e9@gmail.com/
Signed-off-by: Andrzej Hunt <andrzej@ahunt.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#include "cache.h"
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#include "config.h"
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#include "builtin.h"
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#include "parse-options.h"
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#include "run-command.h"
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#include "string-list.h"
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static const char * const for_each_repo_usage[] = {
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N_("git for-each-repo --config=<config> <command-args>"),
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NULL
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};
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static int run_command_on_repo(const char *path, int argc, const char ** argv)
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{
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int i;
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struct child_process child = CHILD_PROCESS_INIT;
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child.git_cmd = 1;
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strvec_pushl(&child.args, "-C", path, NULL);
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for (i = 0; i < argc; i++)
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strvec_push(&child.args, argv[i]);
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return run_command(&child);
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}
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int cmd_for_each_repo(int argc, const char **argv, const char *prefix)
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{
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static const char *config_key = NULL;
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int i, result = 0;
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const struct string_list *values;
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const struct option options[] = {
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OPT_STRING(0, "config", &config_key, N_("config"),
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N_("config key storing a list of repository paths")),
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OPT_END()
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};
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argc = parse_options(argc, argv, prefix, options, for_each_repo_usage,
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PARSE_OPT_STOP_AT_NON_OPTION);
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if (!config_key)
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die(_("missing --config=<config>"));
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values = repo_config_get_value_multi(the_repository,
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config_key);
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/*
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* Do nothing on an empty list, which is equivalent to the case
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* where the config variable does not exist at all.
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*/
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if (!values)
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return 0;
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for (i = 0; !result && i < values->nr; i++)
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result = run_command_on_repo(values->items[i].string, argc, argv);
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return result;
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}
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