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3d7747e318
Returning a shared buffer invites very subtle bugs due to reentrancy or
multi-threading, as demonstrated by the previous patch.
There was an unfinished effort to abolish this [1].
Let's finally rid of `real_path()`, using `strbuf_realpath()` instead.
This patch uses a local `strbuf` for most places where `real_path()` was
previously called.
However, two places return the value of `real_path()` to the caller. For
them, a `static` local `strbuf` was added, effectively pushing the
problem one level higher:
read_gitfile_gently()
get_superproject_working_tree()
[1] https://lore.kernel.org/git/1480964316-99305-1-git-send-email-bmwill@google.com/
Signed-off-by: Alexandr Miloslavskiy <alexandr.miloslavskiy@syntevo.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
128 lines
3 KiB
C
128 lines
3 KiB
C
#include "cache.h"
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#include "config.h"
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#include "strbuf.h"
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#include "run-command.h"
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#include "sigchain.h"
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#ifndef DEFAULT_EDITOR
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#define DEFAULT_EDITOR "vi"
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#endif
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int is_terminal_dumb(void)
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{
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const char *terminal = getenv("TERM");
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return !terminal || !strcmp(terminal, "dumb");
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}
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const char *git_editor(void)
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{
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const char *editor = getenv("GIT_EDITOR");
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int terminal_is_dumb = is_terminal_dumb();
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if (!editor && editor_program)
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editor = editor_program;
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if (!editor && !terminal_is_dumb)
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editor = getenv("VISUAL");
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if (!editor)
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editor = getenv("EDITOR");
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if (!editor && terminal_is_dumb)
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return NULL;
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if (!editor)
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editor = DEFAULT_EDITOR;
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return editor;
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}
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const char *git_sequence_editor(void)
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{
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const char *editor = getenv("GIT_SEQUENCE_EDITOR");
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if (!editor)
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git_config_get_string_const("sequence.editor", &editor);
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if (!editor)
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editor = git_editor();
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return editor;
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}
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static int launch_specified_editor(const char *editor, const char *path,
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struct strbuf *buffer, const char *const *env)
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{
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if (!editor)
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return error("Terminal is dumb, but EDITOR unset");
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if (strcmp(editor, ":")) {
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struct strbuf realpath = STRBUF_INIT;
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const char *args[] = { editor, NULL, NULL };
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struct child_process p = CHILD_PROCESS_INIT;
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int ret, sig;
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int print_waiting_for_editor = advice_waiting_for_editor && isatty(2);
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if (print_waiting_for_editor) {
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/*
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* A dumb terminal cannot erase the line later on. Add a
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* newline to separate the hint from subsequent output.
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*
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* Make sure that our message is separated with a whitespace
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* from further cruft that may be written by the editor.
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*/
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const char term = is_terminal_dumb() ? '\n' : ' ';
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fprintf(stderr,
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_("hint: Waiting for your editor to close the file...%c"),
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term);
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fflush(stderr);
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}
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strbuf_realpath(&realpath, path, 1);
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args[1] = realpath.buf;
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p.argv = args;
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p.env = env;
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p.use_shell = 1;
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p.trace2_child_class = "editor";
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if (start_command(&p) < 0) {
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strbuf_release(&realpath);
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return error("unable to start editor '%s'", editor);
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}
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sigchain_push(SIGINT, SIG_IGN);
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sigchain_push(SIGQUIT, SIG_IGN);
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ret = finish_command(&p);
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strbuf_release(&realpath);
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sig = ret - 128;
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sigchain_pop(SIGINT);
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sigchain_pop(SIGQUIT);
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if (sig == SIGINT || sig == SIGQUIT)
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raise(sig);
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if (ret)
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return error("There was a problem with the editor '%s'.",
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editor);
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if (print_waiting_for_editor && !is_terminal_dumb())
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/*
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* Erase the entire line to avoid wasting the
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* vertical space.
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*/
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term_clear_line();
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}
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if (!buffer)
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return 0;
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if (strbuf_read_file(buffer, path, 0) < 0)
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return error_errno("could not read file '%s'", path);
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return 0;
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}
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int launch_editor(const char *path, struct strbuf *buffer, const char *const *env)
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{
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return launch_specified_editor(git_editor(), path, buffer, env);
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}
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int launch_sequence_editor(const char *path, struct strbuf *buffer,
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const char *const *env)
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{
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return launch_specified_editor(git_sequence_editor(), path, buffer, env);
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}
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