Add sed #2768

kim0 · 2023-09-24T18:31:29Z

Implement sed from https://github.com/u-root/u-root/blob/main/roadmap.md

This supports

echo "This is foo word" | sed -e 's/foo/bar'

Or (from one or more files to stdout)

echo "This is foo word" > file.txt
sed -e 's/foo/bar' file.txt  # output to stdout

Or (from files, inplace write to the same file)

echo "This is foo word" > file.txt
cp file.txt file2.txt
sed -i -e 's/foo/bar' file.txt file2.txt  # output to input files

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

codecov · 2023-09-24T19:11:15Z

Codecov Report

Attention: 19 lines in your changes are missing coverage. Please review.

Comparison is base (37ed9ac) 75.17% compared to head (32cdd2d) 75.19%.

Files	Patch %	Lines
cmds/exp/sed/sed.go	82.24%	19 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2768      +/-   ##
==========================================
+ Coverage   75.17%   75.19%   +0.01%     
==========================================
  Files         432      433       +1     
  Lines       42933    43040     +107     
==========================================
+ Hits        32275    32363      +88     
- Misses      10658    10677      +19

☔ View full report in Codecov by Sentry.
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binjip978

I would recommend to follow the same pattern as we do for example grep command, add support of BRE and add more tests.

binjip978 · 2023-09-25T03:58:41Z

cmds/exp/sed/sed.go

+		for r.Scan() {
+			line := r.Text()
+			for _, transform := range cfg.transforms {
+				line = strings.ReplaceAll(line, transform.from, transform.to)


Sed command should support BRE, here it just a string replace. See https://pubs.opengroup.org/onlinepubs/9699919799.2018edition/utilities/sed.html
So sed -e 's/m.ngo/apple/' FILE will not work as expected.

I'm not a sed/ed expert but replaceAll should happen if command is like s/p1/p2/g in keys of s/old/new/ it should replace only first occurrence per line.

yes. only replace all on a line with g otion.

you can do someting like this
f :=- strings.Replace
if global
f = strings.ReplaceAll

and consider passing f as a parameter to transformCopy, which makes testing easier, as f can something other than strings.Replace.

binjip978 · 2023-09-25T04:03:22Z

cmds/exp/sed/sed.go

+	inplace    bool
+}
+
+var cfg = config{}


Please avoid global variables in command flags it makes testing hard. See /cmds/core/grep
for reference. It's better to create a structure with command flags and other necessary things. This will simplify testing significantly because it you no longer need to unwind global variables.

binjip978 · 2023-09-25T04:13:16Z

cmds/exp/sed/sed.go

+	return fmt.Sprint(*t)
+}
+
+func (t *transforms) Set(value string) error {


I believe sed command parse should be more complicated:

for example this valid command doesn't work:
./sed -e 's/m.ngo/apple/' FILE

Also ./sed 's/mango/apple' FILE don't work either, but it should according to POSIX spec.

So probably the whole sed command parser is complicated, so it's ok to start small. But it need to be aware of regular expression, so I don't think strings.Split will be enough.

starting small is fine, right now we have zero :-)

binjip978 · 2023-09-25T04:18:00Z

cmds/exp/sed/sed_test.go

+	"testing"
+)
+
+type nopCloser struct {


standard library io package has NopCloser(r Reader) ReadCloser

binjip978 · 2023-09-25T04:25:13Z

cmds/exp/sed/sed.go

+			fiDir := path.Dir(fiName)
+			ftmp, err := os.CreateTemp(fiDir, "sed*.txt")
+			if err != nil {
+				fmt.Printf("unable to create temp file: %#v\n", err)


it's better to return errors rather than os.Exit or doing log.Fatalf

binjip978 · 2023-09-25T04:28:12Z

cmds/exp/sed/sed.go

+		if cfg.inplace {
+			fiName := readStreams[i].(*os.File).Name()
+			fiDir := path.Dir(fiName)
+			ftmp, err := os.CreateTemp(fiDir, "sed*.txt")


Why we need to create temp file? We probably can rewrite it in place, also if something go wrong we need to remove it.

I am not sure rewrite in place is an option. If there is a failure at any point, and we have gotten part way through a rewrite in place, that will be very bad. At the same time, reading the entire file in is not really an option, as on limited memory systems it might not fit.

here is what real sed does on linux:

1240935 futex(0x7fefb0c1aa6c, FUTEX_WAKE_PRIVATE, 2147483647) = 0 1240935 openat(AT_FDCWD, "/tmp/hosts", O_RDONLY) = 3 1240935 ioctl(3, TCGETS, 0x7ffc2eb5c010) = -1 ENOTTY (Inappropriate ioctl for device) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 umask(077) = 002 1240935 openat(AT_FDCWD, "/tmp/sedyrouyD", O_RDWR|O_CREAT|O_EXCL, 0600) = 4 1240935 umask(002) = 077 1240935 fcntl(4, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 read(3, "127.0.0.1\tlocalhost\n::1\t\tlocalhost\n127.0.1.1\tpop-os.localdomain\tpop-os\n\n192.168.0.1 centre usbadapter\n192.168.0.2 visionfive2 u6ccf39004821 u6ccf39004820 u7eda2b555f3a\n192.168.0.3 vf3 u6ccf39003f6b u6cc f39003f6a\n\n# windows craptop\n192.168.1.2 galaxy g u00e04c680a0f\n", 4096) = 267 1240935 newfstatat(4, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508433, st_mode=S_IFREG|0600, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=0, st_size=0, st_atime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_atime_nsec=182309592, st_mtime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_mtime_nsec=182309592, st_ctime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_ctime_nsec=182309592}, AT_EMPTY_PATH) = 0 1240935 read(3, "", 4096) = 0 1240935 fchown(4, 1000, 1000) = 0 1240935 fgetxattr(3, "system.posix_acl_access", 0x7ffc2eb5bfb0, 132) = -1 ENODATA (No data available) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 fsetxattr(4, "system.posix_acl_access", "\2\0\0\0\1\0\6\0\377\377\377\377\4\0\4\0\377\377\377\377 \0\4\0\377\377\377\377", 28, 0) = 0 1240935 close(3) = 0 1240935 write(4, "127.0.0.1\tlocblhost\n::1\t\tlocblhost\n127.0.1.1\tpop-os.locbldomain\tpop-os\n\n192.168.0.1 centre usbbdapter\n192.168.0.2 visionfive2 u6ccf39004821 u6ccf39004820 u7edb2b555f3a\n192.168.0.3 vf3 u6ccf39003f6b u6c cf39003f6b\n\n# windows crbptop\n192.168.1.2 gblaxy g u00e04c680a0f\n", 267) = 267 1240935 close(4) = 0 1240935 rename("/tmp/sedyrouyD", "/tmp/hosts") = 0 1240935 close(1) = 0 1240935 exit_group(0) = ?

I suspect this is the best compromise.

You right, sed doing exactly that. Also on linux if I run sed 's/a/b/' file > file I got an empty file at the end, it's kinda surprising result.

it is but it isn't.
The shell evaluates the command and the redirect, so the first thing that happens, after parsing, is the shell truncates file to 0 bytes (> file) and then runs sed on it :-)
It's something we could wish worked differently, but fixing it is harder than telling people not to do it :-)

binjip978 · 2023-09-25T04:29:28Z

cmds/exp/sed/sed.go

+		}
+
+		if err := w.Flush(); err != nil {
+			panic(err)


no need to panic it's better to return error and then log.Fatalf like we do in other commands.

rminnich · 2023-09-25T18:52:25Z

thanks very much for this contribution. Please make the requests from binjip978, they are all very sensible, and we would like to have this command! thanks!

rminnich · 2023-09-25T18:57:16Z

cmds/exp/sed/sed.go

+		if cfg.inplace {
+			fiName := readStreams[i].(*os.File).Name()
+			fiDir := path.Dir(fiName)
+			ftmp, err := os.CreateTemp(fiDir, "sed*.txt")


I am not sure rewrite in place is an option. If there is a failure at any point, and we have gotten part way through a rewrite in place, that will be very bad. At the same time, reading the entire file in is not really an option, as on limited memory systems it might not fit.

here is what real sed does on linux:

1240935 futex(0x7fefb0c1aa6c, FUTEX_WAKE_PRIVATE, 2147483647) = 0 1240935 openat(AT_FDCWD, "/tmp/hosts", O_RDONLY) = 3 1240935 ioctl(3, TCGETS, 0x7ffc2eb5c010) = -1 ENOTTY (Inappropriate ioctl for device) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 umask(077) = 002 1240935 openat(AT_FDCWD, "/tmp/sedyrouyD", O_RDWR|O_CREAT|O_EXCL, 0600) = 4 1240935 umask(002) = 077 1240935 fcntl(4, F_GETFL) = 0x8002 (flags O_RDWR|O_LARGEFILE) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 read(3, "127.0.0.1\tlocalhost\n::1\t\tlocalhost\n127.0.1.1\tpop-os.localdomain\tpop-os\n\n192.168.0.1 centre usbadapter\n192.168.0.2 visionfive2 u6ccf39004821 u6ccf39004820 u7eda2b555f3a\n192.168.0.3 vf3 u6ccf39003f6b u6cc f39003f6a\n\n# windows craptop\n192.168.1.2 galaxy g u00e04c680a0f\n", 4096) = 267 1240935 newfstatat(4, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508433, st_mode=S_IFREG|0600, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=0, st_size=0, st_atime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_atime_nsec=182309592, st_mtime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_mtime_nsec=182309592, st_ctime=1695668175 /* 2023-09-25T11:56:15.182309592-0700 */, st_ctime_nsec=182309592}, AT_EMPTY_PATH) = 0 1240935 read(3, "", 4096) = 0 1240935 fchown(4, 1000, 1000) = 0 1240935 fgetxattr(3, "system.posix_acl_access", 0x7ffc2eb5bfb0, 132) = -1 ENODATA (No data available) 1240935 newfstatat(3, "", {st_dev=makedev(0xfd, 0x1), st_ino=113508431, st_mode=S_IFREG|0644, st_nlink=1, st_uid=1000, st_gid=1000, st_blksize=4096, st_blocks=8, st_size=267, st_atime=1695668151 /* 2023-09-25T11:55:51.782631585-070 0 */, st_atime_nsec=782631585, st_mtime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_mtime_nsec=782631585, st_ctime=1695668151 /* 2023-09-25T11:55:51.782631585-0700 */, st_ctime_nsec=782631585}, AT_EMPTY_PATH) = 0 1240935 fsetxattr(4, "system.posix_acl_access", "\2\0\0\0\1\0\6\0\377\377\377\377\4\0\4\0\377\377\377\377 \0\4\0\377\377\377\377", 28, 0) = 0 1240935 close(3) = 0 1240935 write(4, "127.0.0.1\tlocblhost\n::1\t\tlocblhost\n127.0.1.1\tpop-os.locbldomain\tpop-os\n\n192.168.0.1 centre usbbdapter\n192.168.0.2 visionfive2 u6ccf39004821 u6ccf39004820 u7edb2b555f3a\n192.168.0.3 vf3 u6ccf39003f6b u6c cf39003f6b\n\n# windows crbptop\n192.168.1.2 gblaxy g u00e04c680a0f\n", 267) = 267 1240935 close(4) = 0 1240935 rename("/tmp/sedyrouyD", "/tmp/hosts") = 0 1240935 close(1) = 0 1240935 exit_group(0) = ?

I suspect this is the best compromise.

rminnich · 2023-09-25T18:57:45Z

cmds/exp/sed/sed.go

+		for r.Scan() {
+			line := r.Text()
+			for _, transform := range cfg.transforms {
+				line = strings.ReplaceAll(line, transform.from, transform.to)


yes. only replace all on a line with g otion.

rminnich · 2023-09-25T18:59:05Z

cmds/exp/sed/sed.go

+		for r.Scan() {
+			line := r.Text()
+			for _, transform := range cfg.transforms {
+				line = strings.ReplaceAll(line, transform.from, transform.to)


you can do someting like this
f :=- strings.Replace
if global
f = strings.ReplaceAll

and consider passing f as a parameter to transformCopy, which makes testing easier, as f can something other than strings.Replace.

rminnich · 2023-09-25T18:59:20Z

cmds/exp/sed/sed.go

+	return fmt.Sprint(*t)
+}
+
+func (t *transforms) Set(value string) error {


starting small is fine, right now we have zero :-)

rminnich · 2023-09-25T19:03:46Z

cmds/exp/sed/sed.go

+	writeStreams := make([]io.WriteCloser, l)
+	for i := range writeStreams {
+		if cfg.inplace {
+			fiName := readStreams[i].(*os.File).Name()


This kind of cast is a bit dangerous. Not all ReadClosers are os.File.
Passing ReadCloser is good for testing.
options:
implement your own type that implements ReadCloser and provides Name()
fiName, ok := readStreams[i].(*os.File).Name()
if ! ok {
return fmt.Errorf("can not do in-place rewrite on %T:%w", readStreams[i], os.ErrInvalid) // use %w to make tests easier
}

rminnich · 2023-09-25T19:05:02Z

cmds/exp/sed/sed.go

+func createWriteStreams(cfg config, readStreams []io.ReadCloser) []io.WriteCloser {
+	l := len(readStreams)
+	writeStreams := make([]io.WriteCloser, l)
+	for i := range writeStreams {


If you do:
for i, r := range readStreams {
the code might be easier to write/read.

rminnich · 2023-09-25T19:05:46Z

cmds/exp/sed/sed.go

+		for _, filename := range flag.Args() {
+			fh, err := os.Open(filename)
+			if err != nil {
+				fmt.Printf("unable to open input stream: %s. %#v\n", filename, err)


you can use log.Fatalf instead for fmt.Printf follow by os.Exit. It's the same thing.

rminnich · 2023-09-25T19:06:55Z

cmds/exp/sed/sed.go

+		if cfg.inplace {
+			fo := writeStreams[i]
+			fo.Close()
+			fiName := fi.(*os.File).Name()


again, this cast is dangerous if fi is not an os.File.

kim0 · 2023-09-27T19:03:58Z

Thanks @rminnich @binjip978 for the review. I will give it another iteration (probably this weekend as time permits). And thanks for the encouragement, it helps :)

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

binjip978

Thanks for your contribution, PR is in much better shape now. Also I think you should move command to core from exp.

binjip978 · 2023-10-03T04:27:55Z

cmds/exp/sed/sed.go

+}
+
+func newTmpWriter(filename string) (*tmpWriter, error) {
+	ftmp, err := os.CreateTemp("/tmp", ".sed*.txt")


This is correct, but you can remove "/tmp" and just pass a "", I don't expect someone will run sed on android or windows, but anyway it better to use defaults.

binjip978 · 2023-10-03T04:35:47Z

cmds/exp/sed/sed.go

+	if err != nil {
+		return err
+	}
+	os.Rename(tw.ftmp.Name(), tw.filename)


I think if we got any error when we calling Close for tmpWriter we should delete tmp file. Anyway we should not ignore os.Rename error.

binjip978 · 2023-10-03T05:02:46Z

cmds/exp/sed/sed.go

+				replaced = t.from.ReplaceAllString(line, t.to)
+			} else {
+				counter := 0
+				// Replaces only the first occurrence which golang stdlib does not offer!


I think you can use both regex and strings to simplify:
found := t.from.FindString(line)
if found != "" {
strings.Replace(line, f, t.to, 1)
}

binjip978 · 2023-10-03T05:23:25Z

cmds/exp/sed/sed.go

+		switch e[:1] {
+		case "s":
+			separator := e[1:2]
+			eParts := strings.Split(e, separator)


You probably can't use strings.Split here, the problem is escaping.

See this example:

input file: /home/dir
sed -e 's//home//Home/' file
/Home/dir

./sed -e 's//home//Home/' file
2023/10/03 08:16:44 error parsing expressions: unable to parse transformation. This should be of the form s/old/new/

Also you allow such transformations:
./sed -e 's/hello/world' file
but sed will return an error:
sed -e 's/hello/world' file
sed: 1: "s/hello/world
": unescaped newline inside substitute pattern

rminnich · 2023-11-16T23:49:30Z

hi, if you can, please take a lot and we can get this very useful command in! Thanks!

kim0 · 2023-11-16T23:52:36Z

hi, if you can, please take a lot and we can get this very useful command in! Thanks!

Thanks, I will surely try to allocate some time in the next few weeks to hammer it in shape. Just been too busy

rminnich · 2024-01-29T15:51:41Z

I think this person is not coming back.

kim0 added 3 commits September 24, 2023 21:24

add sed

a32e6e9

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

update roadmap

554fa4f

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

Add copyright

2ef961c

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

binjip978 requested changes Sep 25, 2023

View reviewed changes

binjip978 added the Awaiting author Waiting for new changes or feedback for author. label Sep 25, 2023

rminnich reviewed Sep 25, 2023

View reviewed changes

kim0 added 7 commits September 28, 2023 22:14

tmpWriter

fbe4b0f

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

transform and cmd

a17e694

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

fix linter issues

51bacd5

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

write to file or stdout per inplace

9ada3df

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

use correct fds

ade377a

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

TestStdinSed

081c57e

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

more tests

319a3b2

Signed-off-by: Ahmed Kamal <email.ahmedkamal@googlemail.com>

kim0 requested review from binjip978 and rminnich September 30, 2023 21:02

binjip978 reviewed Oct 3, 2023

View reviewed changes

Merge branch 'main' into aka/sed

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rminnich closed this Jan 29, 2024

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Add sed #2768

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Add sed #2768

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rminnich commented Sep 25, 2023

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kim0 commented Sep 27, 2023

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rminnich commented Nov 16, 2023

kim0 commented Nov 16, 2023

rminnich commented Jan 29, 2024

kim0 commented Sep 24, 2023 •

edited

codecov bot commented Sep 24, 2023 •

edited