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2020-03-10real_path: remove unsafe APIAlexandr Miloslavskiy
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>
2019-06-24pager: add a helper function to clear the last line in the terminalSZEDER Gábor
There are a couple of places where we want to clear the last line on the terminal, e.g. when a progress bar line is overwritten by a shorter line, then the end of that progress line would remain visible, unless we cover it up. In 'progress.c' we did this by always appending a fixed number of space characters to the next line (even if it was not shorter than the previous), but as it turned out that fixed number was not quite large enough, see the fix in 9f1fd84e15 (progress: clear previous progress update dynamically, 2019-04-12). From then on we've been keeping track of the length of the last displayed progress line and appending the appropriate number of space characters to the next line, if necessary, but, alas, this approach turned out to be error prone, see the fix in 1aed1a5f25 (progress: avoid empty line when breaking the progress line, 2019-05-19). The next patch in this series is about to fix a case where we don't clear the last line, and on occasion do end up with such garbage at the end of the line. It would be great if we could do that without the need to deal with that without meticulously computing the necessary number of space characters. So add a helper function to clear the last line on the terminal using an ANSI escape sequence, which has the advantage to clear the whole line no matter how wide it is, even after the terminal width changed. Such an escape sequence is not available on dumb terminals, though, so in that case fall back to simply print a whole terminal width (as reported by term_columns()) worth of space characters. In 'editor.c' launch_specified_editor() already used this ANSI escape sequence, so replace it with a call to this function. Signed-off-by: SZEDER Gábor <szeder.dev@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2019-02-22trace2:data: add editor/pager child classificationJeff Hostetler
Add trace2 process classification for editor and pager child processes. Signed-off-by: Jeff Hostetler <jeffhost@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2018-08-10editor: add a function to launch the sequence editorAlban Gruin
As part of the rewrite of interactive rebase, the sequencer will need to open the sequence editor to allow the user to edit the todo list. Instead of duplicating the existing launch_editor() function, this refactors it to a new function, launch_specified_editor(), which takes the editor as a parameter, in addition to the path, the buffer and the environment variables. launch_sequence_editor() is then added to launch the sequence editor. Signed-off-by: Alban Gruin <alban.gruin@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-12-07launch_editor(): indicate that Git waits for user inputLars Schneider
When a graphical GIT_EDITOR is spawned by a Git command that opens and waits for user input (e.g. "git rebase -i"), then the editor window might be obscured by other windows. The user might be left staring at the original Git terminal window without even realizing that s/he needs to interact with another window before Git can proceed. To this user Git appears hanging. Print a message that Git is waiting for editor input in the original terminal and get rid of it when the editor returns, if the terminal supports erasing the last line. Also, make sure that our message is terminated with a whitespace so that any message the editor may show upon starting up will be kept separate from our message. Power users might not want to see this message or their editor might already print such a message (e.g. emacsclient). Allow these users to suppress the message by disabling the "advice.waitingForEditor" config. The standard advise() function is not used here as it would always add a newline which would make deleting the message harder. Helped-by: Junio C Hamano <gitster@pobox.com> Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2017-12-04refactor "dumb" terminal determinationLars Schneider
Move the code to detect "dumb" terminals into a single location. This avoids duplicating the terminal detection code yet again in a subsequent commit. Signed-off-by: Lars Schneider <larsxschneider@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2016-05-09editor.c: use error_errno()Nguyễn Thái Ngọc Duy
Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2014-08-20run-command: introduce CHILD_PROCESS_INITRené Scharfe
Most struct child_process variables are cleared using memset first after declaration. Provide a macro, CHILD_PROCESS_INIT, that can be used to initialize them statically instead. That's shorter, doesn't require a function call and is slightly more readable (especially given that we already have STRBUF_INIT, ARGV_ARRAY_INIT etc.). Helped-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Rene Scharfe <l.s.r@web.de> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-07-29editor: use canonicalized absolute pathRamkumar Ramachandra
By improving the relative_path() algorithm, e02ca72 (path.c: refactor relative_path(), not only strip prefix, 2013-06-25) uncovered a latent bug in Emacs. While most editor applications like cat and vim handle non-canonicalized relative paths fine, emacs does not. This is due to a long-standing bug in emacs, where it refuses to resolve symlinks in the supplied path: #!/bin/sh cd /tmp mkdir z z/a z/b echo moodle >z/a/file ln -s z/b cd b emacs ../a/file # fail: attempts to open /tmp/a/file Even if emacs were to be patched to fix this bug, it may be nicer to help users running older versions. Note that this can potentially regress for users of all editors, when they ask "what file am I editing?" to the editor, as it is likely to answer with an unsightly long full path. Co-authored-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: Ramkumar Ramachandra <artagnon@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2013-01-06run-command: encode signal death as a positive integerJeff King
When a sub-command dies due to a signal, we encode the signal number into the numeric exit status as "signal - 128". This is easy to identify (versus a regular positive error code), and when cast to an unsigned integer (e.g., by feeding it to exit), matches what a POSIX shell would return when reporting a signal death in $? or through its own exit code. So we have a negative value inside the code, but once it passes across an exit() barrier, it looks positive (and any code we receive from a sub-shell will have the positive form). E.g., death by SIGPIPE (signal 13) will look like -115 to us in inside git, but will end up as 141 when we call exit() with it. And a program killed by SIGPIPE but run via the shell will come to us with an exit code of 141. Unfortunately, this means that when the "use_shell" option is set, we need to be on the lookout for _both_ forms. We might or might not have actually invoked the shell (because we optimize out some useless shell calls). If we didn't invoke the shell, we will will see the sub-process's signal death directly, and run-command converts it into a negative value. But if we did invoke the shell, we will see the shell's 128+signal exit status. To be thorough, we would need to check both, or cast the value to an unsigned char (after checking that it is not -1, which is a magic error value). Fortunately, most callsites do not care at all whether the exit was from a code or from a signal; they merely check for a non-zero status, and sometimes propagate the error via exit(). But for the callers that do care, we can make life slightly easier by just using the consistent positive form. This actually fixes two minor bugs: 1. In launch_editor, we check whether the editor died from SIGINT or SIGQUIT. But we checked only the negative form, meaning that we would fail to notice a signal death exit code which was propagated through the shell. 2. In handle_alias, we assume that a negative return value from run_command means that errno tells us something interesting (like a fork failure, or ENOENT). Otherwise, we simply propagate the exit code. Negative signal death codes confuse us, and we print a useless "unable to run alias 'foo': Success" message. By encoding signal deaths using the positive form, the existing code just propagates it as it would a normal non-zero exit code. The downside is that callers of run_command can no longer differentiate between a signal received directly by the sub-process, and one propagated. However, no caller currently cares, and since we already optimize out some calls to the shell under the hood, that distinction is not something that should be relied upon by callers. Fix the same logic in t/test-terminal.perl for consistency [jc: raised by Jonathan in the discussion]. Signed-off-by: Jeff King <peff@peff.net> Acked-by: Johannes Sixt <j6t@kdbg.org> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-12-02launch_editor: propagate signals from editor to gitJeff King
We block SIGINT and SIGQUIT while the editor runs so that git is not killed accidentally by a stray "^C" meant for the editor or its subprocesses. This works because most editors ignore SIGINT. However, some editor wrappers, like emacsclient, expect to die due to ^C. We detect the signal death in the editor and properly exit, but not before writing a useless error message to stderr. Instead, let's notice when the editor was killed by a terminal signal and just raise the signal on ourselves. This skips the message and looks to our parent like we received SIGINT ourselves. The end effect is that if the user's editor ignores SIGINT, we will, too. And if it does not, then we will behave as if we did not ignore it. That should make all users happy. Note that in the off chance that another part of git has ignored SIGINT while calling launch_editor, we will still properly detect and propagate the failed return code from the editor (i.e., the worst case is that we generate the useless error, not fail to notice the editor's death). Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-12-02launch_editor: ignore terminal signals while editor has controlPaul Fox
The user's editor likely catches SIGINT (ctrl-C). but if the user spawns a command from the editor and uses ctrl-C to kill that command, the SIGINT will likely also kill git itself (depending on the editor, this can leave the terminal in an unusable state). Let's ignore it while the editor is running, and do the same for SIGQUIT, which many editors also ignore. This matches the behavior if we were to use system(3) instead of run-command. Signed-off-by: Paul Fox <pgf@foxharp.boston.ma.us> Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2012-12-02launch_editor: refactor to use start/finish_commandJeff King
The launch_editor function uses the convenient run_command_* interface. Let's use the more flexible start_command and finish_command functions, which will let us manipulate the parent state while we're waiting for the child to finish. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2010-01-06editor: use run_command's shell featureJeff King
Now that run_command implements the same code in a more general form, we can make use of it. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-11-13Provide a build time default-editor settingJonathan Nieder
Provide a DEFAULT_EDITOR knob to allow setting the fallback editor to use instead of vi (when VISUAL, EDITOR, and GIT_EDITOR are unset). The value can be set at build time according to a system’s policy. For example, on Debian systems, the default editor should be the 'editor' command. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Ben Walton <bwalton@artsci.utoronto.ca> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-11-13Teach git var about GIT_EDITORJonathan Nieder
Expose the command used by launch_editor() for scripts to use. This should allow one to avoid searching for a proper editor separately in each command. git_editor(void) uses the logic to decide which editor to use that used to live in launch_editor(). The function returns NULL if there is no suitable editor; the caller is expected to issue an error message when appropriate. launch_editor() uses git_editor() and gives the error message the same way as before when EDITOR is not set. "git var GIT_EDITOR" gives the editor name, or an error message when there is no appropriate one. "git var -l" gives GIT_EDITOR=name only if there is an appropriate editor. Originally-submitted-by: Johannes Sixt <j6t@kdbg.org> Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-11-13Do not use VISUAL editor on dumb terminalsJonathan Nieder
Refuse to use $VISUAL and fall back to $EDITOR if TERM is unset or set to "dumb". Traditionally, VISUAL is set to a screen editor and EDITOR to a line-based editor, which should be more useful in that situation. vim, for example, is happy to assume a terminal supports ANSI sequences even if TERM is dumb (e.g., when running from a text editor like Acme). git already refuses to fall back to vi on a dumb terminal if GIT_EDITOR, core.editor, VISUAL, and EDITOR are unset, but without this patch, that check is suppressed by VISUAL=vi. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2009-10-31Handle more shell metacharacters in editor namesJonathan Nieder
Pass the editor name to the shell if it contains any susv3 shell special character (globs, redirections, variable substitutions, escapes, etc). This way, the meaning of some characters will not meaninglessly change when others are added, and git commands implemented in C and in shell scripts will interpret editor names in the same way. This does not make the GIT_EDITOR setting any more expressive, since one could always use single quotes to force the editor to be passed to the shell. Signed-off-by: Jonathan Nieder <jrnieder@gmail.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-10-12Replace calls to strbuf_init(&foo, 0) with STRBUF_INIT initializerBrandon Casey
Many call sites use strbuf_init(&foo, 0) to initialize local strbuf variable "foo" which has not been accessed since its declaration. These can be replaced with a static initialization using the STRBUF_INIT macro which is just as readable, saves a function call, and takes up fewer lines. Signed-off-by: Brandon Casey <casey@nrlssc.navy.mil> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
2008-07-26editor.c: Libify launch_editor()Stephan Beyer
This patch removes exit()/die() calls and builtin-specific messages from launch_editor(), so that it can be used as a general libgit.a function to launch an editor. Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
2008-07-26Move launch_editor() from builtin-tag.c to editor.cStephan Beyer
launch_editor() is declared in strbuf.h but defined in builtin-tag.c. This patch moves launch_editor() into a new source file editor.c, but keeps the declaration in strbuf.h. Signed-off-by: Stephan Beyer <s-beyer@gmx.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>