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2019-10-22shell: better comments in BASE#nn codeDenys Vlasenko
function old new delta evaluate_string 932 930 -2 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-10-21shell/ulimit: code shrinkDenys Vlasenko
text data bss dec hex filename 1001949 551 5612 1008112 f61f0 busybox_old 1001906 551 5612 1008069 f61c5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-09-22ash: fix BASE###nn bashism for bases 36..64Denys Vlasenko
function old new delta evaluate_string 876 932 +56 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-09-22ash: fix BASE###nn bashism to accept letter 'digits' for bases > 9Denys Vlasenko
function old new delta evaluate_string 873 876 +3 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-09-05ash: add a FIXME commentDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-09-05hush: fix "set -o INVALID" affecting -e flag stateDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-08-02ash: fix set -o to not show "nameless" optionsDenys Vlasenko
Patch by Martijn Dekker <martijn@inlv.org> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-31ash: only catch unexpected exceptions in PS1 expansionRon Yorston
Commit d1a2fa2a4 (ash: catch error in arithmetic expansion in PS1) catches all exceptions raised by expandarg(). Some exceptions, such as the EXEXIT raised when command expansion is used, are expected: export PS1='$(echo "$ ")' These should be processed normally or the shell hangs at the prompt. function old new delta expandstr 344 353 +9 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 9/0) Total: 9 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-07-02libbb: reduce the overhead of single parameter bb_error_msg() callsJames Byrne
Back in 2007, commit 0c97c9d43707 ("'simple' error message functions by Loic Grenie") introduced bb_simple_perror_msg() to allow for a lower overhead call to bb_perror_msg() when only a string was being printed with no parameters. This saves space for some CPU architectures because it avoids the overhead of a call to a variadic function. However there has never been a simple version of bb_error_msg(), and since 2007 many new calls to bb_perror_msg() have been added that only take a single parameter and so could have been using bb_simple_perror_message(). This changeset introduces 'simple' versions of bb_info_msg(), bb_error_msg(), bb_error_msg_and_die(), bb_herror_msg() and bb_herror_msg_and_die(), and replaces all calls that only take a single parameter, or use something like ("%s", arg), with calls to the corresponding 'simple' version. Since it is likely that single parameter calls to the variadic functions may be accidentally reintroduced in the future a new debugging config option WARN_SIMPLE_MSG has been introduced. This uses some macro magic which will cause any such calls to generate a warning, but this is turned off by default to avoid use of the unpleasant macros in normal circumstances. This is a large changeset due to the number of calls that have been replaced. The only files that contain changes other than simple substitution of function calls are libbb.h, libbb/herror_msg.c, libbb/verror_msg.c and libbb/xfuncs_printf.c. In miscutils/devfsd.c, networking/udhcp/common.h and util-linux/mdev.c additonal macros have been added for logging so that single parameter and multiple parameter logging variants exist. The amount of space saved varies considerably by architecture, and was found to be as follows (for 'defconfig' using GCC 7.4): Arm: -92 bytes MIPS: -52 bytes PPC: -1836 bytes x86_64: -938 bytes Note that for the MIPS architecture only an exception had to be made disabling the 'simple' calls for 'udhcp' (in networking/udhcp/common.h) because it made these files larger on MIPS. Signed-off-by: James Byrne <james.byrne@origamienergy.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-06-03ash,hush: show 'c' in $- if run in "sh -c CMD"Denys Vlasenko
function old new delta options 552 599 +47 expand_one_var 2375 2385 +10 optletters_optnames 60 64 +4 hush_main 1108 1111 +3 ash_main 1150 1152 +2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 5/0 up/down: 66/0) Total: 66 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-06-01ash: allocate line editing structure only if neededDenys Vlasenko
function old new delta optschanged 91 128 +37 historycmd 13 17 +4 setcmd 80 78 -2 ash_main 1167 1150 -17 options 576 552 -24 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/3 up/down: 41/-43) Total: -2 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-26shell: move all definitions of strto_arith_t() togetherDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: show 's' in $-Denys Vlasenko
function old new delta expand_one_var 2362 2375 +13 hush_main 1104 1108 +4 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 17/0) Total: 17 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: allocate line edit buffer only for interactive shellDenys Vlasenko
function old new delta builtin_history 16 20 +4 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19shell: implement optional "BASE#nnnn" numeric literalsDenys Vlasenko
function old new delta evaluate_string 729 851 +122 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: remove test for "echo ${-}" errorring out - now it worksDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: implement $-, set default PATH if it is not set on startupDenys Vlasenko
function old new delta expand_one_var 2311 2362 +51 hush_main 1075 1104 +29 parse_dollar 790 791 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 81/0) Total: 81 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: set default PS1/2 only if we interactiveDenys Vlasenko
"env - hush SCRIPT" invocation (that is, with empty environment) should not show PS1/2 in "set" output. function old new delta hush_main 1070 1075 +5 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-19hush: handle LINENO the same way as RANDOM: variable is "ephemeral"Denys Vlasenko
"env - hush" invocation (that is, with empty environment) should not show LINENO in "set" output. function old new delta get_local_var_value 263 294 +31 hush_main 1105 1070 -35 handle_changed_special_names 79 38 -41 run_pipe 1834 1765 -69 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/3 up/down: 31/-145) Total: -114 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-16hush: remove code to track PS1/2 values dynamically - it's too much workDenys Vlasenko
Assignments / exports / unsets of variables are far more frequent than prompt printing, and if we show prompt, we are likely to be limited by user typing speed - do not optimize for that scenario. Just re-query $PS1 / $PS2 values when need to show the prompt. function old new delta fgetc_interactive 236 259 +23 set_vars_and_save_old 150 147 -3 pseudo_exec_argv 597 594 -3 hush_main 1110 1105 -5 enter_var_nest_level 38 32 -6 builtin_local 56 50 -6 run_pipe 1857 1834 -23 leave_var_nest_level 127 98 -29 handle_changed_special_names 111 79 -32 cmdedit_update_prompt 57 - -57 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 1/8 up/down: 23/-164) Total: -141 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-16hush: small speedup in handle_changed_special_names()Denys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-16shell: add TODO comment about BASE#nnn literalsDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-15hush: fix quoted "${notexist-}" expansion to not disappearDenys Vlasenko
function old new delta expand_one_var 2296 2311 +15 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-14shells: add tests for backslashes in export VAR=VALDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-05-14hush: fix "export PS1=xyz" and "local PS1=xyz" messing up promptDenys Vlasenko
function old new delta helper_export_local 215 253 +38 leave_var_nest_level 107 127 +20 run_pipe 1840 1857 +17 handle_changed_special_names 101 105 +4 shell_builtin_read 1399 1398 -1 done_word 767 766 -1 parse_stream 2249 2245 -4 set_local_var 437 430 -7 is_well_formed_var_name 66 - -66 ------------------------------------------------------------------------------ (add/remove: 0/1 grow/shrink: 4/4 up/down: 79/-79) Total: 0 bytes text data bss dec hex filename 952376 485 7296 960157 ea69d busybox_old 952400 485 7296 960181 ea6b5 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-28ash,hush: ulimit: add -i RLIMIT_SIGPENDING, -q RLIMIT_MSGQUEUEDenys Vlasenko
function old new delta limits_tbl 104 120 +16 ulimit_opt_string 44 50 +6 limit_chars 14 16 +2 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 3/0 up/down: 24/0) Total: 24 bytes text data bss dec hex filename 981996 485 7296 989777 f1a51 busybox_old 982065 485 7296 989846 f1a96 busybox_unstripped Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-28ash,hush: bash compat for ulimit: reorder to matchDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-27ash,hush: bash compat for ulimit: -w => -x, -p => -uDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-27ash,hush: fix ulimit to be more bash-compat, closes 11791Denys Vlasenko
function old new delta shell_builtin_ulimit 486 651 +165 limit_chars - 14 +14 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/0 up/down: 179/0) Total: 179 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-19httpd: use full size of iobuf[] when piping CGI dataDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-19ash: catch error in arithmetic expansion in PS1Ron Yorston
Setting PS1 to: PS1='$((123+))' causes the shell to enter an infinite error loop: sh: arithmetic syntax error Catch any exception raised by expandarg() in expandstr() and allow processing to continue. function old new delta expandstr 262 344 +82 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 82/0) Total: 82 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-19ash: prevent error in backquotes in PS1 from exiting shellRon Yorston
Setting PS1 to: PS1='`xxx(`' causes the shell to terminate with the error: sh: syntax error: unexpected end of file (expecting ")") This happens because old-style backquotes require the input to be reread and thus call setinputstring() a second time. Prevent the problem by unwinding all recently opened files in expandstr(). function old new delta unwindfiles - 22 +22 expandstr 247 262 +15 forkchild 631 625 -6 evalcommand 1694 1685 -9 ash_main 1346 1336 -10 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 1/3 up/down: 37/-25) Total: 12 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16ash: add bash-compatible EPOCH variablesRon Yorston
Bash 5.0 added the dynamic variable EPOCHSECONDS and EPOCHREALTIME which return the number of seconds since the Unix Epoch as an integer or float. These are useful for logging or tracing. function old new delta change_epoch - 78 +78 .rodata 175167 175235 +68 varinit_data 264 312 +48 change_seconds - 24 +24 change_realtime - 24 +24 ------------------------------------------------------------------------------ (add/remove: 3/0 grow/shrink: 2/0 up/down: 242/0) Total: 242 bytes text data bss dec hex filename 938508 4203 1888 944599 e69d7 busybox_old 938702 4203 1888 944793 e6a99 busybox_unstripped v2: Cast tv_sec and tv_usec to unsigned quantities. Add brackets to macros. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16ash: an unset dynamic variable should not be dynamicRon Yorston
Commit b28d4c346 (ash: [VAR] Move unsetvar functionality into setvareq) dropped the code that caused dynamic variables to lose their special properties when unset. Add it back again. function old new delta setvareq 346 360 +14 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 14/0) Total: 14 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-16hush: add bash-compatible EPOCH variablesRon Yorston
Bash 5.0 added the dynamic variable EPOCHSECONDS and EPOCHREALTIME which return the number of seconds since the Unix Epoch as an integer or float. These are useful for logging or tracing. function old new delta get_local_var_value 207 302 +95 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/0 up/down: 95/0) Total: 95 bytes text data bss dec hex filename 938702 4203 1888 944793 e6a99 busybox_old 938797 4203 1888 944888 e6af8 busybox_unstripped Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-04-02ash: distinguish 'wait -n' from other bashismsRon Yorston
Add a specific define to indicate which bash compatibility code implements 'wait -n'. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-27hush: fix "wait -n" to wait for a _job_, not a _process_Denys Vlasenko
function old new delta checkjobs 163 183 +20 process_wait_result 449 463 +14 leave_var_nest_level 98 107 +9 enter_var_nest_level 32 38 +6 set_vars_and_save_old 147 150 +3 builtin_local 53 56 +3 builtin_wait 322 323 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 7/0 up/down: 56/0) Total: 56 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-27ash: add "wait -n" bashismDenys Vlasenko
function old new delta waitcmd 205 288 +83 dowait 405 444 +39 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 2/0 up/down: 122/0) Total: 122 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-03-26hush: add "wait -n" bashismDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2019-02-25ash: eval: avoid leaking memory associated with redirections. Closes 7748Ron Yorston
The following constructs result in ever-increasing memory usage: while true; do { true; } </dev/null; done while true; do ( true; ) </dev/null; done For comparison, bash displays static memory usage in both cases. This has been fixed in dash by commit 2bc6caa. The maintainer writes: I have simplified evaltree so that it simply sets the stack mark unconditionally. This allows us to remove the stack marks in the functions called by evaltree. Closes BusyBox bug 7748. function old new delta evaltree 606 632 +26 evalcommand 1724 1696 -28 evalcase 382 351 -31 evalfor 230 196 -34 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 1/3 up/down: 26/-93) Total: -67 bytes Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-12-28config: update size informationDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-12-27randomconfig fixesDenys Vlasenko
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-12-08inetd: suppress aliasing warningDenys Vlasenko
function old new delta sigprocmask2 - 8 +8 wait_for_child_or_signal 213 218 +5 dowait 424 429 +5 block_CHLD_HUP_ALRM 62 59 -3 sigprocmask_SIG_SETMASK 16 - -16 ------------------------------------------------------------------------------ (add/remove: 1/1 grow/shrink: 2/1 up/down: 18/-19) Total: -1 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-12-08suppress gcc 8 aliasing warningsDenys Vlasenko
function old new delta sigprocmask_SIG_SETMASK - 16 +16 wait_for_child_or_signal 221 213 -8 dowait 432 424 -8 Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-27hush: allow hush to run embedded scriptsRon Yorston
Embedded scripts require a shell to be present in the BusyBox binary. Allow either ash or hush to be used for this purpose. If both are enabled ash takes precedence. The size of the binary is unchanged in the default configuration: both ash and hush are present but support for embedded scripts isn't compiled into hush. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-20ash: reset tokpushback before prompting while parsing heredocChristoph Schulz
The parser reads from an already freed memory location, thereby causing unpredictable results, in the following situation: - ENABLE_ASH_EXPAND_PRMT is enabled - heredoc is being parsed - command substitution is used within heredoc Examples where this bug crops up are (PS2 is set to "> "): $ cat <<EOF > `echo abc` > EOF -sh: O: not found $ cat <<EOF > $(echo abc) > EOF -sh: {garbage}: not found The presumable reason is that setprompt_if() causes a nested expansion when ENABLE_ASH_EXPAND_PRMT is enabled, therefore leaving "wordtext" in an unusable state. However, when parseheredoc() is called, "tokpushback" is non-zero, which causes the next call to xxreadtoken() to return TWORD, causing the caller to use the invalid "wordtoken" instead of reading the next valid token. The call chain is: list() -> peektoken() [sets tokpushback to 1] -> parseheredoc() -> setprompt_if() -> pushstackmark() -> expandstr() -> readtoken1() [sets lasttoken to TWORD, wordtoken points to expanded prompt] -> popstackmark() [invalidates wordtoken, leaves lasttoken as is] -> readtoken1() -> ...parsebackq -> list() -> andor() -> pipeline() -> readtoken() -> xxreadtoken() [tokpushback non-zero, reuse lasttoken and wordtext] Note that in almost all other contexts, each call to setprompt_if() is preceded by setting "tokpushback" to zero. One exception is "oldstyle" backquote parsing in readtoken1(), but there "tokpushback" is reset afterwards. The other exception is nlprompt(), but this function is only used within readtoken1() (but in contexts where no nested calls to xxreadtoken() occur) and xxreadtoken() (where "tokpushback" is guaranteed to be zero). function old new delta parseheredoc 124 131 +7 Signed-off-by: Christoph Schulz <develop@kristov.de> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-17Treat custom and applet scripts as appletsRon Yorston
BusyBox has support for embedded shell scripts. Two types can be distinguished: custom scripts and scripts implementing applets. Custom scripts should be placed in the 'embed' directory at build time. They are given a default applet configuration and appear as applets to the user but no further configuration is possible. Applet scripts are integrated with the BusyBox build system and are intended to be used to ship standard applets that just happen to be implemented as scripts. They can be configured at build time and appear just like native applets. Such scripts should be placed in the 'applets_sh' directory. A stub C program should be written to provide the usual applet configuration details and placed in a suitable subsystem directory. It may be helpful to have a configuration option to enable any dependencies the script requires: see the 'nologin' applet for an example. function old new delta scripted_main - 41 +41 applet_names 2773 2781 +8 applet_main 1600 1604 +4 i2cdetect_main 672 674 +2 applet_suid 100 101 +1 applet_install_loc 200 201 +1 applet_flags 100 101 +1 packed_usage 33180 33179 -1 tryexec 159 152 -7 evalcommand 1661 1653 -8 script_names 9 - -9 packed_scripts 123 114 -9 complete_cmd_dir_file 826 811 -15 shellexec 271 254 -17 find_command 1007 990 -17 busybox_main 642 624 -18 run_applet_and_exit 100 78 -22 find_script_by_name 51 - -51 ------------------------------------------------------------------------------ (add/remove: 1/2 grow/shrink: 6/9 up/down: 58/-174) Total: -116 bytes text data bss dec hex filename 950034 477 7296 957807 e9d6f busybox_old 949918 477 7296 957691 e9cfb busybox_unstripped Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-16ash: ensure variables are fully initialised when unsetRon Yorston
When a variable is unset by calling setvar(name, NULL, 0) the code to initialise the new, empty variable fails to initialise the last character of the string. Attempts to read the contents of the unset variable will result in the uninitialised character at the end of the string being accessed. For example, running BusyBox under Valgrind and unsetting PATH: $ valgrind ./busybox_unstripped sh ==21249== Memcheck, a memory error detector ==21249== Copyright (C) 2002-2017, and GNU GPL'd, by Julian Seward et al. ==21249== Using Valgrind-3.14.0 and LibVEX; rerun with -h for copyright info ==21249== Command: ./busybox_unstripped sh ==21249== /data2/git/build_fix_8721 $ unset PATH /data2/git/build_fix_8721 $ 0 ==21249== Conditional jump or move depends on uninitialised value(s) ==21249== at 0x451371: path_advance (ash.c:2555) ==21249== by 0x456E22: find_command (ash.c:13407) ==21249== by 0x458425: evalcommand (ash.c:10139) ==21249== by 0x454CBC: evaltree (ash.c:9131) ==21249== by 0x456C80: cmdloop (ash.c:13164) Closes https://bugs.busybox.net/show_bug.cgi?id=8721 v2: On the dash mailing list Harald van Dijk was kind enough to point out a flaw in my reasoning and provide an alternative patch. Sadly his patch adds 2 bytes of bloat. Using xzalloc to zero the whole string gives a bloat of -3 bytes. function old new delta setvar 172 169 -3 Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-14hush: correct description for HUSH_TICK config optionRon Yorston
The HUSH_TICK configuration option enables command substitution, not process substitution. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2018-11-06ash: minor fixesRon Yorston
Ensure that login_sh is initialised in procargs even when running an embedded script. The argc argument to ash_main isn't unused when embedded scripts are present. Signed-off-by: Ron Yorston <rmy@pobox.com> Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
generated by cgit v1.1 at 2024-10-30 17:36:15 +0000