From 418c9b176cbabf954b6325cca0bea7f9be251afe Mon Sep 17 00:00:00 2001 From: Jonathan Nieder Date: Wed, 16 Nov 2011 02:03:36 -0600 Subject: [PATCH] do not let git_path clobber errno when reporting errors Because git_path() calls vsnprintf(), code like fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666); die_errno(_("Could not write to '%s'"), git_path("SQUASH_MSG")); can end up printing an error indicator from vsnprintf() instead of open() by mistake. Store the path we are trying to write to in a temporary variable and pass _that_ to die_errno(), so the messages written by git cherry-pick/revert and git merge can avoid this source of confusion. Signed-off-by: Jonathan Nieder Signed-off-by: Junio C Hamano --- builtin/merge.c | 49 ++++++++++++++++++++++++++++-------------------- builtin/revert.c | 9 +++++---- 2 files changed, 34 insertions(+), 24 deletions(-) diff --git a/builtin/merge.c b/builtin/merge.c index dffd5ec12..2870a6af6 100644 --- a/builtin/merge.c +++ b/builtin/merge.c @@ -316,13 +316,15 @@ static void squash_message(struct commit *commit) struct rev_info rev; struct strbuf out = STRBUF_INIT; struct commit_list *j; + const char *filename; int fd; struct pretty_print_context ctx = {0}; printf(_("Squash commit -- not updating HEAD\n")); - fd = open(git_path("SQUASH_MSG"), O_WRONLY | O_CREAT, 0666); + filename = git_path("SQUASH_MSG"); + fd = open(filename, O_WRONLY | O_CREAT, 0666); if (fd < 0) - die_errno(_("Could not write to '%s'"), git_path("SQUASH_MSG")); + die_errno(_("Could not write to '%s'"), filename); init_revisions(&rev, NULL); rev.ignore_merges = 1; @@ -492,14 +494,16 @@ static void merge_name(const char *remote, struct strbuf *msg) if (!strcmp(remote, "FETCH_HEAD") && !access(git_path("FETCH_HEAD"), R_OK)) { + const char *filename; FILE *fp; struct strbuf line = STRBUF_INIT; char *ptr; - fp = fopen(git_path("FETCH_HEAD"), "r"); + filename = git_path("FETCH_HEAD"); + fp = fopen(filename, "r"); if (!fp) die_errno(_("could not open '%s' for reading"), - git_path("FETCH_HEAD")); + filename); strbuf_getline(&line, fp, '\n'); fclose(fp); ptr = strstr(line.buf, "\tnot-for-merge\t"); @@ -847,20 +851,22 @@ static void add_strategies(const char *string, unsigned attr) static void write_merge_msg(struct strbuf *msg) { - int fd = open(git_path("MERGE_MSG"), O_WRONLY | O_CREAT, 0666); + const char *filename = git_path("MERGE_MSG"); + int fd = open(filename, O_WRONLY | O_CREAT, 0666); if (fd < 0) die_errno(_("Could not open '%s' for writing"), - git_path("MERGE_MSG")); + filename); if (write_in_full(fd, msg->buf, msg->len) != msg->len) - die_errno(_("Could not write to '%s'"), git_path("MERGE_MSG")); + die_errno(_("Could not write to '%s'"), filename); close(fd); } static void read_merge_msg(struct strbuf *msg) { + const char *filename = git_path("MERGE_MSG"); strbuf_reset(msg); - if (strbuf_read_file(msg, git_path("MERGE_MSG"), 0) < 0) - die_errno(_("Could not read from '%s'"), git_path("MERGE_MSG")); + if (strbuf_read_file(msg, filename, 0) < 0) + die_errno(_("Could not read from '%s'"), filename); } static void write_merge_state(void); @@ -948,13 +954,14 @@ static int finish_automerge(struct commit *head, static int suggest_conflicts(int renormalizing) { + const char *filename; FILE *fp; int pos; - fp = fopen(git_path("MERGE_MSG"), "a"); + filename = git_path("MERGE_MSG"); + fp = fopen(filename, "a"); if (!fp) - die_errno(_("Could not open '%s' for writing"), - git_path("MERGE_MSG")); + die_errno(_("Could not open '%s' for writing"), filename); fprintf(fp, "\nConflicts:\n"); for (pos = 0; pos < active_nr; pos++) { struct cache_entry *ce = active_cache[pos]; @@ -1046,6 +1053,7 @@ static int setup_with_upstream(const char ***argv) static void write_merge_state(void) { + const char *filename; int fd; struct commit_list *j; struct strbuf buf = STRBUF_INIT; @@ -1053,24 +1061,25 @@ static void write_merge_state(void) for (j = remoteheads; j; j = j->next) strbuf_addf(&buf, "%s\n", sha1_to_hex(j->item->object.sha1)); - fd = open(git_path("MERGE_HEAD"), O_WRONLY | O_CREAT, 0666); + filename = git_path("MERGE_HEAD"); + fd = open(filename, O_WRONLY | O_CREAT, 0666); if (fd < 0) - die_errno(_("Could not open '%s' for writing"), - git_path("MERGE_HEAD")); + die_errno(_("Could not open '%s' for writing"), filename); if (write_in_full(fd, buf.buf, buf.len) != buf.len) - die_errno(_("Could not write to '%s'"), git_path("MERGE_HEAD")); + die_errno(_("Could not write to '%s'"), filename); close(fd); strbuf_addch(&merge_msg, '\n'); write_merge_msg(&merge_msg); - fd = open(git_path("MERGE_MODE"), O_WRONLY | O_CREAT | O_TRUNC, 0666); + + filename = git_path("MERGE_MODE"); + fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC, 0666); if (fd < 0) - die_errno(_("Could not open '%s' for writing"), - git_path("MERGE_MODE")); + die_errno(_("Could not open '%s' for writing"), filename); strbuf_reset(&buf); if (!allow_fast_forward) strbuf_addf(&buf, "no-ff"); if (write_in_full(fd, buf.buf, buf.len) != buf.len) - die_errno(_("Could not write to '%s'"), git_path("MERGE_MODE")); + die_errno(_("Could not write to '%s'"), filename); close(fd); } diff --git a/builtin/revert.c b/builtin/revert.c index b61c8e5c5..544e8c305 100644 --- a/builtin/revert.c +++ b/builtin/revert.c @@ -288,17 +288,18 @@ static char *get_encoding(const char *message) static void write_cherry_pick_head(struct commit *commit) { + const char *filename; int fd; struct strbuf buf = STRBUF_INIT; strbuf_addf(&buf, "%s\n", sha1_to_hex(commit->object.sha1)); - fd = open(git_path("CHERRY_PICK_HEAD"), O_WRONLY | O_CREAT, 0666); + filename = git_path("CHERRY_PICK_HEAD"); + fd = open(filename, O_WRONLY | O_CREAT, 0666); if (fd < 0) - die_errno(_("Could not open '%s' for writing"), - git_path("CHERRY_PICK_HEAD")); + die_errno(_("Could not open '%s' for writing"), filename); if (write_in_full(fd, buf.buf, buf.len) != buf.len || close(fd)) - die_errno(_("Could not write to '%s'"), git_path("CHERRY_PICK_HEAD")); + die_errno(_("Could not write to '%s'"), filename); strbuf_release(&buf); } -- 2.30.2