By default, Git used to set $LESS to -FRSX if $LESS was not set by the
user. The FRX flags actually make sense for Git (F and X because Git
sometimes pipes short output to less, and R because Git pipes colored
output). The S flag (chop long lines), on the other hand, is not related
to Git and is a matter of user preference. Git should not decide for the
user to change LESS's default.
More specifically, the S flag harms users who review untrusted code
within a pager, since a patch looking like:
-old code;
+new good code; [... lots of tabs ...] malicious code;
would appear identical to:
-old code;
+new good code;
Users who prefer the old behavior can still set the $LESS environment
variable to -FRSX explicitly, or set core.pager to 'less -S'.
The documentation in config.txt is made a bit longer to keep both an
example setting the 'S' flag (needed to recover the old behavior) and an
example showing how to unset a flag set by Git.
Signed-off-by: Matthieu Moy <Matthieu.Moy@xxxxxxx>
---
This is just a rewrite of PATCH v1 on top of master instead of pu.
Documentation/config.txt | 13 ++++++++-----
git-sh-setup.sh | 2 +-
pager.c | 2 +-
perl/Git/SVN/Log.pm | 2 +-
4 files changed, 11 insertions(+), 8 deletions(-)
diff --git a/Documentation/config.txt b/Documentation/config.txt
index 73c8973..5484d9d 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -553,14 +553,17 @@ core.pager::
configuration, then `$PAGER`, and then the default chosen at
compile time (usually 'less').
+
-When the `LESS` environment variable is unset, Git sets it to `FRSX`
+When the `LESS` environment variable is unset, Git sets it to `FRX`
(if `LESS` environment variable is set, Git does not change it at
all). If you want to selectively override Git's default setting
-for `LESS`, you can set `core.pager` to e.g. `less -+S`. This will
+for `LESS`, you can set `core.pager` to e.g. `less -S`. This will
be passed to the shell by Git, which will translate the final
-command to `LESS=FRSX less -+S`. The environment tells the command
-to set the `S` option to chop long lines but the command line
-resets it to the default to fold long lines.
+command to `LESS=FRX less -S`. The environment does not set the
+`S` option but the command line does, instructing less to truncate
+long lines. Similarly, setting `core.pager` to `less -+F` will
+deactivate the `F` option specified by the environment from the
+command-line, deactivating the "quit if one screen" behavior of
+`less`.
+
Likewise, when the `LV` environment variable is unset, Git sets it
to `-c`. You can override this setting by exporting `LV` with
diff --git a/git-sh-setup.sh b/git-sh-setup.sh
index 5f28b32..9447980 100644
--- a/git-sh-setup.sh
+++ b/git-sh-setup.sh
@@ -160,7 +160,7 @@ git_pager() {
else
GIT_PAGER=cat
fi
- : ${LESS=-FRSX}
+ : ${LESS=-FRX}
: ${LV=-c}
export LESS LV
diff --git a/pager.c b/pager.c
index 0cc75a8..f75e8ae 100644
--- a/pager.c
+++ b/pager.c
@@ -85,7 +85,7 @@ void setup_pager(void)
int i = 0;
if (!getenv("LESS"))
- env[i++] = "LESS=FRSX";
+ env[i++] = "LESS=FRX";
if (!getenv("LV"))
env[i++] = "LV=-c";
env[i] = NULL;
diff --git a/perl/Git/SVN/Log.pm b/perl/Git/SVN/Log.pm
index 34f2869..6641053 100644
--- a/perl/Git/SVN/Log.pm
+++ b/perl/Git/SVN/Log.pm
@@ -116,7 +116,7 @@ sub run_pager {
return;
}
open STDIN, '<&', $rfd or fatal "Can't redirect stdin: $!";
- $ENV{LESS} ||= 'FRSX';
+ $ENV{LESS} ||= 'FRX';
$ENV{LV} ||= '-c';
exec $pager or fatal "Can't run pager: $! ($pager)";
}
--
1.9.2.698.ge58c0c2.dirty
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