From 6cf6bb3e47ac2f667fa0b27a4222e903ff6fb77c Mon Sep 17 00:00:00 2001 From: Arnout Engelen Date: Sat, 18 Dec 2010 22:28:00 +0100 Subject: [PATCH] Improve error messages when temporary file creation fails Before, when creating a temporary file failed, a generic 'Unable to create temporary file' message was printed. In some cases this could lead to confusion as to which directory should be checked for correct permissions etc. This patch adds the template for the temporary filename to the error message, converting it to an absolute path if needed. A test verifies that the template is indeed printed when pointing to a nonexistent or unwritable directory. A copy of the original template is made in case mkstemp clears the template. Signed-off-by: Arnout Engelen Signed-off-by: Junio C Hamano --- Makefile | 1 + t/t0070-fundamental.sh | 13 +++++++++++++ test-mktemp.c | 14 ++++++++++++++ wrapper.c | 32 ++++++++++++++++++++++++++++---- 4 files changed, 56 insertions(+), 4 deletions(-) create mode 100644 test-mktemp.c diff --git a/Makefile b/Makefile index 57d9c65e0..03a51cb8f 100644 --- a/Makefile +++ b/Makefile @@ -434,6 +434,7 @@ TEST_PROGRAMS_NEED_X += test-string-pool TEST_PROGRAMS_NEED_X += test-svn-fe TEST_PROGRAMS_NEED_X += test-treap TEST_PROGRAMS_NEED_X += test-index-version +TEST_PROGRAMS_NEED_X += test-mktemp TEST_PROGRAMS = $(patsubst %,%$X,$(TEST_PROGRAMS_NEED_X)) diff --git a/t/t0070-fundamental.sh b/t/t0070-fundamental.sh index 680d7d686..9bee8bfd2 100755 --- a/t/t0070-fundamental.sh +++ b/t/t0070-fundamental.sh @@ -12,4 +12,17 @@ test_expect_success 'character classes (isspace, isalpha etc.)' ' test-ctype ' +test_expect_success 'mktemp to nonexistent directory prints filename' ' + test_must_fail test-mktemp doesnotexist/testXXXXXX 2>err && + grep "doesnotexist/test" err +' + +test_expect_success POSIXPERM 'mktemp to unwritable directory prints filename' ' + mkdir cannotwrite && + chmod -w cannotwrite && + test_when_finished "chmod +w cannotwrite" && + test_must_fail test-mktemp cannotwrite/testXXXXXX 2>err && + grep "cannotwrite/test" err +' + test_done diff --git a/test-mktemp.c b/test-mktemp.c new file mode 100644 index 000000000..c8c54213a --- /dev/null +++ b/test-mktemp.c @@ -0,0 +1,14 @@ +/* + * test-mktemp.c: code to exercise the creation of temporary files + */ +#include "git-compat-util.h" + +int main(int argc, char *argv[]) +{ + if (argc != 2) + usage("Expected 1 parameter defining the temporary file template"); + + xmkstemp(xstrdup(argv[1])); + + return 0; +} diff --git a/wrapper.c b/wrapper.c index 8d7dd31c4..55b074ec4 100644 --- a/wrapper.c +++ b/wrapper.c @@ -198,10 +198,22 @@ FILE *xfdopen(int fd, const char *mode) int xmkstemp(char *template) { int fd; + char origtemplate[PATH_MAX]; + strlcpy(origtemplate, template, sizeof(origtemplate)); fd = mkstemp(template); - if (fd < 0) - die_errno("Unable to create temporary file"); + if (fd < 0) { + int saved_errno = errno; + const char *nonrelative_template; + + if (!template[0]) + template = origtemplate; + + nonrelative_template = make_nonrelative_path(template); + errno = saved_errno; + die_errno("Unable to create temporary file '%s'", + nonrelative_template); + } return fd; } @@ -321,10 +333,22 @@ int gitmkstemps(char *pattern, int suffix_len) int xmkstemp_mode(char *template, int mode) { int fd; + char origtemplate[PATH_MAX]; + strlcpy(origtemplate, template, sizeof(origtemplate)); fd = git_mkstemp_mode(template, mode); - if (fd < 0) - die_errno("Unable to create temporary file"); + if (fd < 0) { + int saved_errno = errno; + const char *nonrelative_template; + + if (!template[0]) + template = origtemplate; + + nonrelative_template = make_nonrelative_path(template); + errno = saved_errno; + die_errno("Unable to create temporary file '%s'", + nonrelative_template); + } return fd; } -- 2.30.2