GNU logs - #47380, boring messages

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Subject: bug#47380: Atomic install of files
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Date: Thu, 25 Mar 2021 12:09:03 +0200
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Hello,

`make install` calls:

/usr/bin/install -c imap/.libs/httpd /usr/local/libexec/

and the syscalls behind are:

newfstatat(AT_FDCWD, "imap/.libs/httpd", {st_mode=S_IFREG|0755,
st_size=3362912, ...}, 0) = 0
newfstatat(AT_FDCWD, "/usr/local/libexec/httpd", {st_mode=S_IFREG|0755,
st_size=3362912, ...}, AT_SYMLINK_NOFOLLOW) = 0
unlink("/usr/local/libexec/httpd")      = 0
openat(AT_FDCWD, "imap/.libs/httpd", O_RDONLY) = 3
fstat(3, {st_mode=S_IFREG|0755, st_size=3362912, ...}) = 0
openat(AT_FDCWD, "/usr/local/libexec/httpd", O_WRONLY|O_CREAT|O_EXCL,
0600) = 4
fstat(4, {st_mode=S_IFREG|0600, st_size=0, ...}) = 0
ioctl(4, BTRFS_IOC_CLONE or FICLONE, 3) = -1 EOPNOTSUPP (Operation not
supported)
fadvise64(3, 0, 0, POSIX_FADV_SEQUENTIAL) = 0
mmap(NULL, 139264, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1,
0) = 0x7ff6aad05000
read(3,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\2\0>\0\1\0\0\0\260\343A\0\0\0\0\0"...,
131072) = 131072
write(4,
"\177ELF\2\1\1\0\0\0\0\0\0\0\0\0\2\0>\0\1\0\0\0\260\343A\0\0\0\0\0"...,
131072) = 131072
read(3,
"\377H\211\302H\213\205h\372\377\377\211\331H\211\306H\307\307\4\252\35
3\212\350t\0\6\0H\213E\340"..., 131072) = 131072
close(4)                                = 0
close(3)                                = 0
munmap(0x7ff6aad05000, 139264)          = 0
lstat("/usr/local/libexec/httpd", {st_mode=S_IFREG|0600,
st_size=3362912, ...}) = 0
chmod("/usr/local/libexec/httpd", 0755) = 0
lstat("/usr/local/libexec/httpd", {st_mode=S_IFREG|0755,
st_size=3362912, ...}) = 0

That said, the installation is not atomic: the destination file is
opened, truncated, then bytes are written to it.  During the
installation process, the initially executable file is not executable.

Cyrus IMAP is a server-software, which detect whenever its executable
files have changed, terminates the processes with the changed files and
starts the processes again, by re-executing the executables.

This does not work, if the file shall be started, while its content is
being copied: at this time the file is not executable and this is not
good.

• Please adjust `install` to first write the data to a temporary file
and at the end rename(2) the file to the destination, so that the
installation is atomic: the destination file is at all times
executable. (Or provide any means to achieve the atomic copy effect by
Automake)

Kind regards
  Дилян

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Subject: bug#47380: Acknowledgement (Atomic install of files)
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Date: Thu, 25 Mar 2021 10:11:01 +0000

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severity 47701 wishlist
severity 53145 wishlist
severity 50940 wishlist
severity 49679 wishlist
severity 49428 wishlist
severity 47701 wishlist
severity 47700 wishlist
severity 47380 wishlist
severity 47243 wishlist
tags 47151 wontfix

Last modified: Mon, 21 Feb 2022 10:00:02 UTC

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